all: Modernize error wrapping (#8491 )

This replaces old style errors.Wrap with modern fmt.Errorf and removes the (direct) dependency on github.com/pkg/errors. A couple of cases are adjusted by hand as previously errors.Wrap(nil, ...) would return nil, which is not what fmt.Errorf does.
gui, man, authors: Update docs, translations, and contributors
2026-01-03 11:29:10 -05:00 · 2022-08-16 10:01:49 +02:00 · 2022-08-15 04:09:30 +00:00 · 2022-08-14 21:25:45 +02:00 · 2022-08-12 07:48:00 +02:00 · 2022-08-12 07:47:20 +02:00
720 changed files with 115733 additions and 29629 deletions
--- a/.codecov.yml
+++ b/.codecov.yml
@@ -1,5 +1,20 @@
+comment: false
+
 coverage:
  range: "40...100"
+  precision: 1
+  status:
+    patch:
+      default:
+        informational: true
+    project:
+      default:
+        informational: true
+
+github_checks:
+  annotations: false

 ignore:
  - "**.pb.go"
+  - "**_mocked.go"
+  - "**/mocks/*"
--- a/.deepsource.toml
+++ b/.deepsource.toml
@@ -0,0 +1,12 @@
+version = 1
+
+exclude_patterns = ["**/*.pb.go"]
+test_patterns = ["**/*_test.go"]
+
+[[analyzers]]
+name = "go"
+enabled = true
+
+  [analyzers.meta]
+  import_paths = ["github.com/syncthing/syncthing"]
+  build_tags = ["noassets"]
--- a/.github/FUNDING.yml
+++ b/.github/FUNDING.yml
@@ -0,0 +1,11 @@
+github: syncthing
+custom: "https://syncthing.net/donations/"
+
+# patreon: # Replace with a single Patreon username
+# open_collective: # Replace with a single Open Collective username
+# ko_fi: # Replace with a single Ko-fi username
+# tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+# community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+# liberapay: # Replace with a single Liberapay username
+# issuehunt: # Replace with a single IssueHunt username
+# otechie: # Replace with a single Otechie username
--- a/.github/ISSUE_TEMPLATE/config.yml
+++ b/.github/ISSUE_TEMPLATE/config.yml
@@ -1,6 +1,6 @@
 blank_issues_enabled: false
 contact_links:
-  - name: Ask a question
+  - name: I need help / I have a question
    url: https://forum.syncthing.net/
    about: Ask questions, get support, and discuss with other community members.
  - name: Android issues
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -0,0 +1,13 @@
+version: 2
+updates:
+- package-ecosystem: "github-actions"
+  directory: "/"
+  schedule:
+    interval: weekly
+  open-pull-requests-limit: 10
+  
+- package-ecosystem: "gomod"
+  directory: "/"
+  schedule:
+    interval: weekly
+  open-pull-requests-limit: 10
--- a/.github/workflows/update-docs-translations.yaml
+++ b/.github/workflows/update-docs-translations.yaml
@@ -0,0 +1,29 @@
+name: Update translations and documentation
+on:
+  workflow_dispatch:
+  schedule:
+    - cron:  '42 3 * * 1'
+
+jobs:
+
+  update_transifex_docs:
+    runs-on: ubuntu-latest
+    name: Update translations and documentation
+    steps:
+      - uses: actions/checkout@629c2de402a417ea7690ca6ce3f33229e27606a5 # v2
+        with:
+          fetch-depth: 0
+          token: ${{ secrets.ACTIONS_GITHUB_TOKEN }}
+      - uses: actions/setup-go@84cbf8094393cdc5fe1fe1671ff2647332956b1a # v2
+        with:
+          go-version: ^1.18.4
+      - run: |
+          set -euo pipefail
+          git config --global user.name 'Syncthing Release Automation'
+          git config --global user.email 'release@syncthing.net'
+          bash build.sh translate
+          bash build.sh prerelease
+          git push
+        env:
+          TRANSIFEX_USER: ${{ secrets.TRANSIFEX_USER }}
+          TRANSIFEX_PASS: ${{ secrets.TRANSIFEX_PASS }}
--- a/.gitignore
+++ b/.gitignore
@@ -17,3 +17,6 @@ RELEASE
 deb
 *.bz2
 /repos
+/proto/scripts/protoc-gen-gosyncthing
+/gui/next-gen-gui
+.idea
--- a/57
+++ b/57
@@ -19,6 +19,7 @@ Adel Qalieh (adelq) <aqalieh95@gmail.com> <adelq@users.noreply.github.com>
 Alan Pope <alan@popey.com>
 Alberto Donato <albertodonato@users.noreply.github.com>
 Alessandro G. (alessandro.g89) <alessandro.g89@gmail.com>
+Alex Lindeman <139387+aelindeman@users.noreply.github.com>
 Alex Xu <alex.hello71@gmail.com>
 Alexander Graf (alex2108) <register-github@alex-graf.de>
 Alexandre Viau (aviau) <alexandre@alexandreviau.net> <aviau@debian.org>
@@ -26,6 +27,7 @@ Aman Gupta <aman@tmm1.net>
 Anderson Mesquita (andersonvom) <andersonvom@gmail.com>
 andresvia <andres.via@gmail.com>
 Andrew Dunham (andrew-d) <andrew@du.nham.ca>
+Andrew Meyer <andrewm.bpi@gmail.com>
 Andrew Rabert (nvllsvm) <ar@nullsum.net> <6550543+nvllsvm@users.noreply.github.com>
 Andrey D (scienmind) <scintertech@cryptolab.net> <scienmind@users.noreply.github.com>
 André Colomb (acolomb) <src@andre.colomb.de> <github.com@andre.colomb.de>
@@ -33,8 +35,10 @@ andyleap <andyleap@gmail.com>
 Anjan Momi <anjan@momi.ca>
 Antoine Lamielle (0x010C) <antoine.lamielle@0x010c.fr> <gh@0x010c.fr>
 Antony Male (canton7) <antony.male@gmail.com>
+Anur <anurnomeru@163.com>
 Aranjedeath <Aranjedeath@users.noreply.github.com>
 Arkadiusz Tymiński <gevleeog@gmail.com>
+Aroun <login@b-vo.fr>
 Arthur Axel fREW Schmidt (frioux) <frew@afoolishmanifesto.com> <frioux@gmail.com>
 Artur Zubilewicz <AkaZecik@users.noreply.github.com>
 Audrius Butkevicius (AudriusButkevicius) <audrius.butkevicius@gmail.com> <github@audrius.rocks>
@@ -47,6 +51,7 @@ Ben Shepherd (benshep) <bjashepherd@gmail.com>
 Ben Sidhom (bsidhom) <bsidhom@gmail.com>
 Benedikt Heine (bebehei) <bebe@bebehei.de>
 Benedikt Morbach <benedikt.morbach@googlemail.com>
+Benjamin Nater <17193640+bn4t@users.noreply.github.com>
 Benno Fünfstück <benno.fuenfstueck@gmail.com>
 Benny Ng (tpng) <benny.tpng@gmail.com>
 boomsquared <54829195+boomsquared@users.noreply.github.com>
@@ -55,50 +60,63 @@ Boris Rybalkin <ribalkin@gmail.com>
 Brandon Philips (philips) <brandon@ifup.org>
 Brendan Long (brendanlong) <self@brendanlong.com>
 Brian R. Becker (brbecker) <brbecker@gmail.com>
+bt90 <btom1990@googlemail.com>
 Caleb Callaway (cqcallaw) <enlightened.despot@gmail.com>
 Carsten Hagemann (carstenhag) <moter8@gmail.com> <carsten@chagemann.de>
 Cathryne Linenweaver (Cathryne) <cathryne.linenweaver@gmail.com> <Cathryne@users.noreply.github.com> <katrinleinweber@MAC.local>
 Cedric Staniewski (xduugu) <cedric@gmx.ca>
 chenrui <rui@meetup.com>
+Chih-Hsuan Yen <yan12125@gmail.com>
+Choongkyu <choongkyu.kim+gh@gmail.com> <vapidlyrapid+gh@gmail.com>
 Chris Howie (cdhowie) <me@chrishowie.com>
 Chris Joel (cdata) <chris@scriptolo.gy>
 Chris Tonkinson <chris@masterbran.ch>
+Christian Prescott <me@christianprescott.com>
 chucic <chucic@seznam.cz>
 Colin Kennedy (moshen) <moshen.colin@gmail.com>
 Cromefire_ <tim.l@nghorst.net> <26320625+cromefire@users.noreply.github.com>
 Cyprien Devillez <cypx@users.noreply.github.com>
 Dale Visser <dale.visser@live.com>
 Dan <benda.daniel@gmail.com>
+Daniel Barczyk <46358936+DanielBarczyk@users.noreply.github.com>
 Daniel Bergmann (brgmnn) <dan.arne.bergmann@gmail.com> <brgmnn@users.noreply.github.com>
 Daniel Harte (norgeous) <daniel@harte.me> <daniel@danielharte.co.uk> <norgeous@users.noreply.github.com>
 Daniel Martí (mvdan) <mvdan@mvdan.cc>
 Darshil Chanpura (dtchanpura) <dtchanpura@gmail.com> <dcprime314@gmail.com>
 David Rimmer (dinosore) <dinosore@dbrsoftware.co.uk>
+deepsource-autofix[bot] <62050782+deepsource-autofix[bot]@users.noreply.github.com>
 Denis A. (dva) <denisva@gmail.com>
 Dennis Wilson (snnd) <dw@risu.io>
 dependabot-preview[bot] <dependabot-preview[bot]@users.noreply.github.com> <27856297+dependabot-preview[bot]@users.noreply.github.com>
-dependabot[bot] <dependabot[bot]@users.noreply.github.com>
+dependabot[bot] <dependabot[bot]@users.noreply.github.com> <49699333+dependabot[bot]@users.noreply.github.com>
 derekriemer <derek.riemer@colorado.edu>
 desbma <desbma@users.noreply.github.com>
+Devon G. Redekopp <devon@redekopp.com>
 Dmitry Saveliev (dsaveliev) <d.e.saveliev@gmail.com>
 Domenic Horner <domenic@tgxn.net>
 Dominik Heidler (asdil12) <dominik@heidler.eu>
 Elias Jarlebring (jarlebring) <jarlebring@gmail.com>
 Elliot Huffman <thelich2@gmail.com>
 Emil Hessman (ceh) <emil@hessman.se>
+Eng Zer Jun <engzerjun@gmail.com>
+Eric Lesiuta <elesiuta@gmail.com>
 Erik Meitner (WSGCSysadmin) <e.meitner@willystreet.coop>
+Evan Spensley <94762716+0evan@users.noreply.github.com>
 Evgeny Kuznetsov <evgeny@kuznetsov.md>
 Federico Castagnini (facastagnini) <federico.castagnini@gmail.com>
 Felix Ableitner (Nutomic) <me@nutomic.com>
+Felix Lampe <mail@flampe.de>
 Felix Unterpaintner (bigbear2nd) <bigbear2nd@gmail.com>
 Francois-Xavier Gsell (zukoo) <fxgsell@gmail.com>
 Frank Isemann (fti7) <frank@isemann.name>
+Gahl Saraf <saraf.gahl@gmail.com> <gahl@raftt.io>
 georgespatton <georgespatton@users.noreply.github.com>
 ghjklw <malo@jaffre.info>
 Gilli Sigurdsson (gillisig) <gilli@vx.is>
 Gleb Sinyavskiy <zhulik.gleb@gmail.com>
 Graham Miln (grahammiln) <graham.miln@dssw.co.uk> <graham.miln@miln.eu>
 greatroar <61184462+greatroar@users.noreply.github.com>
+Greg <gco@jazzhaiku.com>
 Han Boetes <han@boetes.org>
 HansK-p <42314815+HansK-p@users.noreply.github.com>
 Harrison Jones (harrisonhjones) <harrisonhjones@users.noreply.github.com>
@@ -106,6 +124,8 @@ Heiko Zuerker (Smiley73) <heiko@zuerker.org>
 Hugo Locurcio <hugo.locurcio@hugo.pro>
 Iain Barnett <iainspeed@gmail.com>
 Ian Johnson (anonymouse64) <ian.johnson@canonical.com> <person.uwsome@gmail.com>
+ignacy123 <ignacy.buczek@onet.pl>
+Ikko Ashimine <eltociear@gmail.com>
 Ilya Brin <464157+ilyabrin@users.noreply.github.com>
 Iskander Sharipov (Alex) <quasilyte@gmail.com>
 Jaakko Hannikainen (jgke) <jgke@jgke.fi>
@@ -116,24 +136,31 @@ Jake Peterson (acogdev) <jake@acogdev.com>
 Jakob Borg (calmh) <jakob@nym.se> <jakob@kastelo.net>
 James Patterson (jpjp) <jamespatterson@operamail.com> <jpjp@users.noreply.github.com>
 janost <janost@tuta.io>
+Jaroslav Lichtblau <svetlemodry@users.noreply.github.com>
 Jaroslav Malec (dzarda) <dzardacz@gmail.com>
 jaseg <githubaccount@jaseg.net>
+Jauder Ho <jauderho@users.noreply.github.com>
 Jaya Chithra (jayachithra) <s.k.jayachithra@gmail.com>
+Jeffery To <jeffery.to@gmail.com>
 jelle van der Waa <jelle@vdwaa.nl>
 Jens Diemer (jedie) <github.com@jensdiemer.de> <git@jensdiemer.de>
 Jerry Jacobs (xor-gate) <jerry.jacobs@xor-gate.org> <xor-gate@users.noreply.github.com>
+Jesse Lucas <jesse@jesselucas.com>
 Jochen Voss (seehuhn) <voss@seehuhn.de>
 Johan Andersson <j@i19.se>
 Johan Vromans (sciurius) <jvromans@squirrel.nl>
 John Rinehart (fuzzybear3965) <johnrichardrinehart@gmail.com>
 Jonas Thelemann <e-mail@jonas-thelemann.de>
-Jonathan <artback@protonmail.com>
+Jonathan <artback@protonmail.com> <jonagn@gmail.com>
 Jonathan Cross <jcross@gmail.com>
+Jonta <359397+Jonta@users.noreply.github.com>
 Jose Manuel Delicado (jmdaweb) <jmdaweb@hotmail.com> <jmdaweb@users.noreply.github.com>
+jtagcat <git-514635f7@jtag.cat> <git-12dbd862@jtag.cat>
 Jörg Thalheim <Mic92@users.noreply.github.com>
 Jędrzej Kula <kula.jedrek@gmail.com>
 Kalle Laine <pahakalle@protonmail.com>
 Karol Różycki (krozycki) <rozycki.karol@gmail.com>
+Kebin Liu <lkebin@gmail.com>
 Keith Turner <kturner@apache.org>
 Kelong Cong (kc1212) <kc04bc@gmx.com> <kc1212@users.noreply.github.com>
 Ken'ichi Kamada (kamadak) <kamada@nanohz.org>
@@ -143,12 +170,14 @@ Kevin White, Jr. (kwhite17) <kevinwhite1710@gmail.com>
 klemens <ka7@github.com>
 Kurt Fitzner (Kudalufi) <kurt@va1der.ca> <kurt.fitzner@gmail.com>
 Lars K.W. Gohlke (lkwg82) <lkwg82@gmx.de>
+Lars Lehtonen <lars.lehtonen@gmail.com>
 Laurent Arnoud <laurent@spkdev.net>
 Laurent Etiemble (letiemble) <laurent.etiemble@gmail.com> <laurent.etiemble@monobjc.net>
 Leo Arias (elopio) <yo@elopio.net>
 Liu Siyuan (liusy182) <liusy182@gmail.com> <liusy182@hotmail.com>
 Lode Hoste (Zillode) <zillode@zillode.be>
 Lord Landon Agahnim (LordLandon) <lordlandon@gmail.com>
+LSmithx2 <42276854+lsmithx2@users.noreply.github.com>
 Lukas Lihotzki <lukas@lihotzki.de>
 Majed Abdulaziz (majedev) <majed.alhajry@gmail.com>
 Marc Laporte (marclaporte) <marc@marclaporte.com> <marc@laporte.name>
@@ -158,6 +187,7 @@ marco-m <marco.molteni@laposte.net>
 Marcus Legendre <marcus.legendre@gmail.com>
 Mario Majila <mariustshipichik@gmail.com>
 Mark Pulford (mpx) <mark@kyne.com.au>
+Martchus <martchus@gmx.net>
 Mateusz Naściszewski (mateon1) <matin1111@wp.pl>
 Mateusz Ż <thedead4fun@live.com>
 Matic Potočnik <hairyfotr@gmail.com>
@@ -165,19 +195,23 @@ Matt Burke (burkemw3) <mburke@amplify.com> <burkemw3@gmail.com>
 Matt Robenolt <matt@ydekproductions.com>
 Matteo Ruina <matteo.ruina@gmail.com>
 Maurizio Tomasi <ziotom78@gmail.com>
+Max <github@germancoding.com>
 Max Schulze (kralo) <max.schulze@online.de> <kralo@users.noreply.github.com>
 MaximAL <almaximal@ya.ru>
 Maxime Thirouin <m@moox.io>
+mclang <1721600+mclang@users.noreply.github.com>
 Michael Jephcote (Rewt0r) <rewt0r@gmx.com> <Rewt0r@users.noreply.github.com>
 Michael Ploujnikov (plouj) <ploujj@gmail.com>
 Michael Rienstra <mrienstra@gmail.com>
 Michael Tilli (pyfisch) <pyfisch@gmail.com>
+MichaIng <micha@dietpi.com>
 Mike Boone <mike@boonedocks.net>
 MikeLund <MikeLund@users.noreply.github.com>
 MikolajTwarog <43782609+MikolajTwarog@users.noreply.github.com>
 Mingxuan Lin <gdlmx@users.noreply.github.com>
 mv1005 <49659413+mv1005@users.noreply.github.com>
 Nate Morrison (nrm21) <natemorrison@gmail.com>
+Naveen <172697+naveensrinivasan@users.noreply.github.com>
 Nicholas Rishel (PrototypeNM1) <rishel.nick@gmail.com> <PrototypeNM1@users.noreply.github.com>
 Nico Stapelbroek <3368018+nstapelbroek@users.noreply.github.com>
 Nicolas Braud-Santoni <nicolas@braud-santoni.eu>
@@ -190,6 +224,7 @@ NoLooseEnds <jon.koslung@gmail.com>
 Oliver Freyermuth <o.freyermuth@googlemail.com>
 otbutz <tbutz@optitool.de>
 Otiel <Otiel@users.noreply.github.com>
+overkill <22098433+0verk1ll@users.noreply.github.com>
 Oyebanji Jacob Mayowa <oyebanji05@gmail.com>
 Pablo <pbaeyens31+github@gmail.com>
 Pascal Jungblut (pascalj) <github@pascalj.com> <mail@pascal-jungblut.com>
@@ -201,22 +236,29 @@ Peter Badida <KeyWeeUsr@users.noreply.github.com>
 Peter Dave Hello <hsu@peterdavehello.org>
 Peter Hoeg (peterhoeg) <peter@speartail.com>
 Peter Marquardt (wwwutz) <wwwutz@gmail.com> <wwwutz@googlemail.com>
+Phani Rithvij <phanirithvij2000@gmail.com>
 Phil Davis <phil.davis@inf.org>
 Philippe Schommers (filoozoom) <philippe@schommers.be>
 Phill Luby (pluby) <phill.luby@newredo.com>
 Pier Paolo Ramon <ramonpierre@gmail.com>
 Piotr Bejda (piobpl) <piotrb10@gmail.com>
 Pramodh KP (pramodhkp) <pramodh.p@directi.com> <1507241+pramodhkp@users.noreply.github.com>
+Quentin Hibon <qh.public@yahoo.com>
+Rahmi Pruitt <rjpruitt16@gmail.com>
+red_led <red-led@users.noreply.github.com>
 Richard Hartmann <RichiH@users.noreply.github.com>
 Robert Carosi (nov1n) <robert@carosi.nl>
+Roberto Santalla <roobre@users.noreply.github.com>
 Robin Schoonover <robin@cornhooves.org>
 Roman Zaynetdinov (zaynetro) <romanznet@gmail.com>
 Ross Smith II (rasa) <ross@smithii.com>
 rubenbe <github-com-00ff86@vandamme.email>
 Ruslan Yevdokymov <38809160+ruslanye@users.noreply.github.com>
+Ryan Qian <i@bitbili.net>
 Ryan Sullivan (KayoticSully) <kayoticsully@gmail.com>
 Sacheendra Talluri (sacheendra) <sacheendra.t@gmail.com>
 Scott Klupfel (kluppy) <kluppy@going2blue.com>
+sec65 <106604020+sec65@users.noreply.github.com>
 Sergey Mishin (ralder) <ralder@yandex.ru>
 Shaarad Dalvi <60266155+shaaraddalvi@users.noreply.github.com>
 Simon Frei (imsodin) <freisim93@gmail.com>
@@ -224,15 +266,19 @@ Simon Mwepu <simonmwepu@gmail.com>
 Sly_tom_cat <slytomcat@mail.ru>
 Stefan Kuntz (Stefan-Code) <stefan.github@gmail.com> <Stefan.github@gmail.com>
 Stefan Tatschner (rumpelsepp) <stefan@sevenbyte.org> <rumpelsepp@sevenbyte.org> <stefan@rumpelsepp.org>
+Steven Eckhoff <steven.eckhoff.opensource@gmail.com>
 Suhas Gundimeda (snugghash) <suhas.gundimeda@gmail.com> <snugghash@gmail.com>
+Syncthing Automation <automation@syncthing.net>
+Syncthing Release Automation <release@syncthing.net>
 Taylor Khan (nelsonkhan) <nelsonkhan@gmail.com>
 Thomas Hipp <thomashipp@gmail.com>
 Tim Abell (timabell) <tim@timwise.co.uk>
 Tim Howes (timhowes) <timhowes@berkeley.edu>
+Tobias Klauser <tobias.klauser@gmail.com>
 Tobias Nygren (tnn2) <tnn@nygren.pp.se>
 Tobias Tom (tobiastom) <t.tom@succont.de>
 Tom Jakubowski <tom@crystae.net>
-Tomasz Wilczyński <5626656+tomasz1986@users.noreply.github.com>
+Tomasz Wilczyński <5626656+tomasz1986@users.noreply.github.com> <twilczynski@naver.com>
 Tommy Thorn <tommy-github-email@thorn.ws>
 Tully Robinson (tojrobinson) <tully@tojr.org>
 Tyler Brazier (tylerbrazier) <tyler@tylerbrazier.com>
@@ -241,12 +287,15 @@ Unrud (Unrud) <unrud@openaliasbox.org> <Unrud@users.noreply.github.com>
 Veeti Paananen (veeti) <veeti.paananen@rojekti.fi>
 Victor Buinsky (buinsky) <vix_booja@tut.by>
 Vil Brekin (Vilbrekin) <vilbrekin@gmail.com>
-Vladimir Rusinov <vrusinov@google.com>
+villekalliomaki <53118179+villekalliomaki@users.noreply.github.com>
+Vladimir Rusinov <vrusinov@google.com> <vladimir.rusinov@gmail.com>
 wangguoliang <liangcszzu@163.com>
 William A. Kennington III (wkennington) <william@wkennington.com>
+wouter bolsterlee <wouter@bolsterl.ee>
 Wulf Weich (wweich) <wweich@users.noreply.github.com> <wweich@gmx.de> <wulf@weich-kr.de>
 xarx00 <xarx00@users.noreply.github.com>
 Xavier O. (damajor) <damajor@gmail.com>
 xjtdy888 (xjtdy888) <xjtdy888@163.com>
 Yannic A. (eipiminus1) <eipiminusone+github@gmail.com> <eipiminus1@users.noreply.github.com>
 佛跳墙 <daoquan@qq.com>
+落心 <luoxin.ttt@gmail.com>
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,6 +1,6 @@
 ## Reporting Bugs

-Please file bugs in the [Github Issue
+Please file bugs in the [GitHub Issue
 Tracker](https://github.com/syncthing/syncthing/issues). Include at
 least the following:

--- a/2
+++ b/2
@@ -11,7 +11,7 @@ RUN rm -f syncthing && go run build.go -no-upgrade build syncthing

 FROM alpine

-EXPOSE 8384 22000 21027/udp
+EXPOSE 8384 22000/tcp 22000/udp 21027/udp

 VOLUME ["/var/syncthing"]

--- a/Dockerfile.builder
+++ b/Dockerfile.builder
@@ -6,4 +6,4 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 	locales rubygems ruby-dev build-essential git \
 	&& apt-get clean \
 	&& rm -rf /var/lib/apt/lists/* \
-	&& gem install --no-ri --no-rdoc fpm
+	&& gem install fpm
--- a/Dockerfile.buildx
+++ b/Dockerfile.buildx
@@ -0,0 +1,19 @@
+FROM alpine
+ARG TARGETARCH
+
+EXPOSE 8384 22000/tcp 22000/udp 21027/udp
+
+VOLUME ["/var/syncthing"]
+
+RUN apk add --no-cache ca-certificates su-exec tzdata
+
+COPY ./syncthing-linux-$TARGETARCH /bin/syncthing
+COPY ./script/docker-entrypoint.sh /bin/entrypoint.sh
+
+ENV PUID=1000 PGID=1000 HOME=/var/syncthing
+
+HEALTHCHECK --interval=1m --timeout=10s \
+  CMD nc -z 127.0.0.1 8384 || exit 1
+
+ENV STGUIADDRESS=0.0.0.0:8384
+ENTRYPOINT ["/bin/entrypoint.sh", "/bin/syncthing", "-home", "/var/syncthing/config"]
--- a/README-Docker.md
+++ b/README-Docker.md
@@ -7,25 +7,53 @@ Use the `/var/syncthing` volume to have the synchronized files available on the
 host. You can add more folders and map them as you prefer.

 Note that Syncthing runs as UID 1000 and GID 1000 by default. These may be
-altered with the ``PUID`` and ``PGID`` environment variables.
+altered with the ``PUID`` and ``PGID`` environment variables. In addition
+the name of the Syncthing instance can be optionally defined by using
+``--hostname=syncthing`` parameter.

 ## Example Usage

+**Docker cli**
 ```
 $ docker pull syncthing/syncthing
-$ docker run -p 8384:8384 -p 22000:22000 \
+$ docker run -p 8384:8384 -p 22000:22000/tcp -p 22000:22000/udp -p 21027:21027/udp \
    -v /wherever/st-sync:/var/syncthing \
+    --hostname=my-syncthing \
    syncthing/syncthing:latest
 ```

+**Docker compose**
+```yml
+---
+version: "3"
+services:
+  syncthing:
+    image: syncthing/syncthing
+    container_name: syncthing
+    hostname: my-syncthing
+    environment:
+      - PUID=1000
+      - PGID=1000
+    volumes:
+      - /wherever/st-sync:/var/syncthing
+    ports:
+      - 8384:8384 # Web UI
+      - 22000:22000/tcp # TCP file transfers
+      - 22000:22000/udp # QUIC file transfers
+      - 21027:21027/udp # Receive local discovery broadcasts
+    restart: unless-stopped
+```
+
 ## Discovery

-Note that local device discovery will not work with the above command,
-resulting in poor local transfer rates if local device addresses are not
-manually configured.
+Note that Docker's default network mode prevents local IP addresses from
+being discovered, as Syncthing is only able to see the internal IP of the
+container on the `172.17.0.0/16` subnet. This will result in poor transfer rates
+if local device addresses are not manually configured.

-To allow local discovery, the docker host network can be used instead:
+It is therefore advisable to use the [host network mode](https://docs.docker.com/network/host/) instead:

+**Docker cli**
 ```
 $ docker pull syncthing/syncthing
 $ docker run --network=host \
@@ -33,6 +61,24 @@ $ docker run --network=host \
    syncthing/syncthing:latest
 ```

+**Docker compose**
+```yml
+---
+version: "3"
+services:
+  syncthing:
+    image: syncthing/syncthing
+    container_name: syncthing
+    hostname: my-syncthing
+    environment:
+      - PUID=1000
+      - PGID=1000
+    volumes:
+      - /wherever/st-sync:/var/syncthing
+    network_mode: host
+    restart: unless-stopped
+```
+
 Be aware that syncthing alone is now in control of what interfaces and ports it
 listens on. You can edit the syncthing configuration to change the defaults if
 there are conflicts.
--- a/README.md
+++ b/README.md
@@ -73,15 +73,16 @@ This helps the team understand what are the biggest pain points for our users, a

 ## Getting in Touch

-The first and best point of contact is the [Forum][8]. There is also an IRC
-channel, `#syncthing` on [freenode][4] (with a [web client][9]), for talking
-directly to developers and users. If you've found something that is clearly a
+The first and best point of contact is the [Forum][8].
+If you've found something that is clearly a
 bug, feel free to report it in the [GitHub issue tracker][10].

 ## Building

-Building Syncthing from source is easy, and there's a [guide][5]
-that describes it for both Unix and Windows systems.
+Building Syncthing from source is easy. After extracting the source bundle from
+a release or checking out git, you just need to run `go run build.go` and the
+binaries are created in `./bin`. There's [a guide][5] with more details on the
+build process.

 ## Signed Releases

@@ -95,19 +96,17 @@ binaries are also properly code signed.

 ## Documentation

-Please see the [Syncthing documentation site][6].
+Please see the Syncthing [documentation site][6] [[source]][17].

 All code is licensed under the [MPLv2 License][7].

 [1]: https://docs.syncthing.net/specs/bep-v1.html
 [2]: https://docs.syncthing.net/intro/getting-started.html
 [3]: https://github.com/syncthing/syncthing/blob/main/etc
-[4]: https://www.freenode.net/
 [5]: https://docs.syncthing.net/dev/building.html
 [6]: https://docs.syncthing.net/
 [7]: https://github.com/syncthing/syncthing/blob/main/LICENSE
 [8]: https://forum.syncthing.net/
-[9]: https://kiwiirc.com/client/irc.freenode.net/#syncthing
 [10]: https://github.com/syncthing/syncthing/issues
 [11]: https://docs.syncthing.net/users/contrib.html#gui-wrappers
 [12]: https://www.bountysource.com/teams/syncthing/issues
@@ -115,4 +114,4 @@ All code is licensed under the [MPLv2 License][7].
 [14]: assets/logo-text-128.png
 [15]: https://syncthing.net/
 [16]: https://github.com/syncthing/syncthing/blob/main/README-Docker.md
-
+[17]: https://github.com/syncthing/docs
--- a/build.go
+++ b/build.go
@@ -4,6 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

+//go:build ignore
 // +build ignore

 package main
@@ -14,13 +15,11 @@ import (
 	"bytes"
 	"compress/flate"
 	"compress/gzip"
-	"crypto/sha256"
 	"encoding/json"
 	"errors"
 	"flag"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"os/exec"
@@ -30,27 +29,34 @@ import (
 	"runtime"
 	"strconv"
 	"strings"
+	"text/template"
 	"time"
+
+	buildpkg "github.com/syncthing/syncthing/lib/build"
 )

 var (
-	goarch        string
-	goos          string
-	noupgrade     bool
-	version       string
-	goCmd         string
-	race          bool
-	debug         = os.Getenv("BUILDDEBUG") != ""
-	extraTags     string
-	installSuffix string
-	pkgdir        string
-	cc            string
-	run           string
-	benchRun      string
-	debugBinary   bool
-	coverage      bool
-	timeout       = "120s"
-	numVersions   = 5
+	goarch         string
+	goos           string
+	noupgrade      bool
+	version        string
+	goCmd          string
+	race           bool
+	debug          = os.Getenv("BUILDDEBUG") != ""
+	extraTags      string
+	installSuffix  string
+	pkgdir         string
+	cc             string
+	run            string
+	benchRun       string
+	buildOut       string
+	debugBinary    bool
+	coverage       bool
+	long           bool
+	timeout        = "120s"
+	longTimeout    = "600s"
+	numVersions    = 5
+	withNextGenGUI = os.Getenv("BUILD_NEXT_GEN_GUI") != ""
 )

 type target struct {
@@ -58,12 +64,11 @@ type target struct {
 	debname           string
 	debdeps           []string
 	debpre            string
-	debpost           string
 	description       string
 	buildPkgs         []string
 	binaryName        string
 	archiveFiles      []archiveFile
-	systemdServices   []string
+	systemdService    string
 	installationFiles []archiveFile
 	tags              []string
 }
@@ -85,7 +90,6 @@ var targets = map[string]target{
 		name:        "syncthing",
 		debname:     "syncthing",
 		debdeps:     []string{"libc6", "procps"},
-		debpost:     "script/post-upgrade",
 		description: "Open Source Continuous File Synchronization",
 		buildPkgs:   []string{"github.com/syncthing/syncthing/cmd/syncthing"},
 		binaryName:  "syncthing", // .exe will be added automatically for Windows builds
@@ -96,6 +100,7 @@ var targets = map[string]target{
 			{src: "AUTHORS", dst: "AUTHORS.txt", perm: 0644},
 			// All files from etc/ and extra/ added automatically in init().
 		},
+		systemdService: "syncthing@*.service",
 		installationFiles: []archiveFile{
 			{src: "{{binary}}", dst: "deb/usr/bin/{{binary}}", perm: 0755},
 			{src: "README.md", dst: "deb/usr/share/doc/syncthing/README.txt", perm: 0644},
@@ -114,6 +119,7 @@ var targets = map[string]target{
 			{src: "etc/linux-systemd/system/syncthing@.service", dst: "deb/lib/systemd/system/syncthing@.service", perm: 0644},
 			{src: "etc/linux-systemd/system/syncthing-resume.service", dst: "deb/lib/systemd/system/syncthing-resume.service", perm: 0644},
 			{src: "etc/linux-systemd/user/syncthing.service", dst: "deb/usr/lib/systemd/user/syncthing.service", perm: 0644},
+			{src: "etc/linux-sysctl/30-syncthing.conf", dst: "deb/usr/lib/sysctl.d/30-syncthing.conf", perm: 0644},
 			{src: "etc/firewall-ufw/syncthing", dst: "deb/etc/ufw/applications.d/syncthing", perm: 0644},
 			{src: "etc/linux-desktop/syncthing-start.desktop", dst: "deb/usr/share/applications/syncthing-start.desktop", perm: 0644},
 			{src: "etc/linux-desktop/syncthing-ui.desktop", dst: "deb/usr/share/applications/syncthing-ui.desktop", perm: 0644},
@@ -139,15 +145,14 @@ var targets = map[string]target{
 			{src: "LICENSE", dst: "LICENSE.txt", perm: 0644},
 			{src: "AUTHORS", dst: "AUTHORS.txt", perm: 0644},
 		},
-		systemdServices: []string{
-			"cmd/stdiscosrv/etc/linux-systemd/stdiscosrv.service",
-		},
+		systemdService: "stdiscosrv.service",
 		installationFiles: []archiveFile{
 			{src: "{{binary}}", dst: "deb/usr/bin/{{binary}}", perm: 0755},
 			{src: "cmd/stdiscosrv/README.md", dst: "deb/usr/share/doc/syncthing-discosrv/README.txt", perm: 0644},
 			{src: "LICENSE", dst: "deb/usr/share/doc/syncthing-discosrv/LICENSE.txt", perm: 0644},
 			{src: "AUTHORS", dst: "deb/usr/share/doc/syncthing-discosrv/AUTHORS.txt", perm: 0644},
 			{src: "man/stdiscosrv.1", dst: "deb/usr/share/man/man1/stdiscosrv.1", perm: 0644},
+			{src: "cmd/stdiscosrv/etc/linux-systemd/stdiscosrv.service", dst: "deb/lib/systemd/system/stdiscosrv.service", perm: 0644},
 			{src: "cmd/stdiscosrv/etc/linux-systemd/default", dst: "deb/etc/default/syncthing-discosrv", perm: 0644},
 			{src: "cmd/stdiscosrv/etc/firewall-ufw/stdiscosrv", dst: "deb/etc/ufw/applications.d/stdiscosrv", perm: 0644},
 		},
@@ -168,9 +173,7 @@ var targets = map[string]target{
 			{src: "LICENSE", dst: "LICENSE.txt", perm: 0644},
 			{src: "AUTHORS", dst: "AUTHORS.txt", perm: 0644},
 		},
-		systemdServices: []string{
-			"cmd/strelaysrv/etc/linux-systemd/strelaysrv.service",
-		},
+		systemdService: "strelaysrv.service",
 		installationFiles: []archiveFile{
 			{src: "{{binary}}", dst: "deb/usr/bin/{{binary}}", perm: 0755},
 			{src: "cmd/strelaysrv/README.md", dst: "deb/usr/share/doc/syncthing-relaysrv/README.txt", perm: 0644},
@@ -178,6 +181,7 @@ var targets = map[string]target{
 			{src: "LICENSE", dst: "deb/usr/share/doc/syncthing-relaysrv/LICENSE.txt", perm: 0644},
 			{src: "AUTHORS", dst: "deb/usr/share/doc/syncthing-relaysrv/AUTHORS.txt", perm: 0644},
 			{src: "man/strelaysrv.1", dst: "deb/usr/share/man/man1/strelaysrv.1", perm: 0644},
+			{src: "cmd/strelaysrv/etc/linux-systemd/strelaysrv.service", dst: "deb/lib/systemd/system/strelaysrv.service", perm: 0644},
 			{src: "cmd/strelaysrv/etc/linux-systemd/default", dst: "deb/etc/default/syncthing-relaysrv", perm: 0644},
 			{src: "cmd/strelaysrv/etc/firewall-ufw/strelaysrv", dst: "deb/etc/ufw/applications.d/strelaysrv", perm: 0644},
 		},
@@ -204,19 +208,7 @@ var targets = map[string]target{
 	},
 }

-// These are repos we need to clone to run "go generate"
-
-type dependencyRepo struct {
-	path   string
-	repo   string
-	commit string
-}
-
-var dependencyRepos = []dependencyRepo{
-	{path: "xdr", repo: "https://github.com/calmh/xdr.git", commit: "08e072f9cb16"},
-}
-
-func init() {
+func initTargets() {
 	all := targets["all"]
 	pkgs, _ := filepath.Glob("cmd/*")
 	for _, pkg := range pkgs {
@@ -225,6 +217,9 @@ func init() {
 			// ignore dotfiles
 			continue
 		}
+		if noupgrade && pkg == "stupgrades" {
+			continue
+		}
 		all.buildPkgs = append(all.buildPkgs, fmt.Sprintf("github.com/syncthing/syncthing/cmd/%s", pkg))
 	}
 	targets["all"] = all
@@ -256,6 +251,8 @@ func main() {
 		}()
 	}

+	initTargets()
+
 	// Invoking build.go with no parameters at all builds everything (incrementally),
 	// which is what you want for maximum error checking during development.
 	if flag.NArg() == 0 {
@@ -278,29 +275,25 @@ func main() {
 }

 func runCommand(cmd string, target target) {
+	var tags []string
+	if noupgrade {
+		tags = []string{"noupgrade"}
+	}
+	tags = append(tags, strings.Fields(extraTags)...)
+
 	switch cmd {
 	case "install":
-		var tags []string
-		if noupgrade {
-			tags = []string{"noupgrade"}
-		}
-		tags = append(tags, strings.Fields(extraTags)...)
 		install(target, tags)
 		metalintShort()

 	case "build":
-		var tags []string
-		if noupgrade {
-			tags = []string{"noupgrade"}
-		}
-		tags = append(tags, strings.Fields(extraTags)...)
 		build(target, tags)

 	case "test":
-		test("github.com/syncthing/syncthing/lib/...", "github.com/syncthing/syncthing/cmd/...")
+		test(strings.Fields(extraTags), "github.com/syncthing/syncthing/lib/...", "github.com/syncthing/syncthing/cmd/...")

 	case "bench":
-		bench("github.com/syncthing/syncthing/lib/...", "github.com/syncthing/syncthing/cmd/...")
+		bench(strings.Fields(extraTags), "github.com/syncthing/syncthing/lib/...", "github.com/syncthing/syncthing/cmd/...")

 	case "integration":
 		integration(false)
@@ -311,9 +304,15 @@ func runCommand(cmd string, target target) {
 	case "assets":
 		rebuildAssets()

+	case "update-deps":
+		updateDependencies()
+
 	case "proto":
 		proto()

+	case "testmocks":
+		testmocks()
+
 	case "translate":
 		translate()

@@ -321,10 +320,10 @@ func runCommand(cmd string, target target) {
 		transifex()

 	case "tar":
-		buildTar(target)
+		buildTar(target, tags)

 	case "zip":
-		buildZip(target)
+		buildZip(target, tags)

 	case "deb":
 		buildDeb(target)
@@ -373,20 +372,30 @@ func parseFlags() {
 	flag.StringVar(&cc, "cc", os.Getenv("CC"), "Set CC environment variable for `go build`")
 	flag.BoolVar(&debugBinary, "debug-binary", debugBinary, "Create unoptimized binary to use with delve, set -gcflags='-N -l' and omit -ldflags")
 	flag.BoolVar(&coverage, "coverage", coverage, "Write coverage profile of tests to coverage.txt")
+	flag.BoolVar(&long, "long", long, "Run tests without the -short flag")
 	flag.IntVar(&numVersions, "num-versions", numVersions, "Number of versions for changelog command")
 	flag.StringVar(&run, "run", "", "Specify which tests to run")
 	flag.StringVar(&benchRun, "bench", "", "Specify which benchmarks to run")
+	flag.BoolVar(&withNextGenGUI, "with-next-gen-gui", withNextGenGUI, "Also build 'newgui'")
+	flag.StringVar(&buildOut, "build-out", "", "Set the '-o' value for 'go build'")
 	flag.Parse()
 }

-func test(pkgs ...string) {
+func test(tags []string, pkgs ...string) {
 	lazyRebuildAssets()

-	args := []string{"test", "-short", "-timeout", timeout, "-tags", "purego"}
+	tags = append(tags, "purego")
+	args := []string{"test", "-tags", strings.Join(tags, " ")}
+	if long {
+		timeout = longTimeout
+	} else {
+		args = append(args, "-short")
+	}
+	args = append(args, "-timeout", timeout)

 	if runtime.GOARCH == "amd64" {
 		switch runtime.GOOS {
-		case "darwin", "linux", "freebsd": // , "windows": # See https://github.com/golang/go/issues/27089
+		case buildpkg.Darwin, buildpkg.Linux, buildpkg.FreeBSD: // , "windows": # See https://github.com/golang/go/issues/27089
 			args = append(args, "-race")
 		}
 	}
@@ -400,9 +409,9 @@ func test(pkgs ...string) {
 	runPrint(goCmd, append(args, pkgs...)...)
 }

-func bench(pkgs ...string) {
+func bench(tags []string, pkgs ...string) {
 	lazyRebuildAssets()
-	args := append([]string{"test", "-run", "NONE"}, benchArgs()...)
+	args := append([]string{"test", "-run", "NONE", "-tags", strings.Join(tags, " ")}, benchArgs()...)
 	runPrint(goCmd, append(args, pkgs...)...)
 }

@@ -441,6 +450,10 @@ func benchArgs() []string {
 }

 func install(target target, tags []string) {
+	if (target.name == "syncthing" || target.name == "") && !withNextGenGUI {
+		log.Println("Notice: Next generation GUI will not be built; see --with-next-gen-gui.")
+	}
+
 	lazyRebuildAssets()

 	tags = append(target.tags, tags...)
@@ -470,6 +483,10 @@ func install(target target, tags []string) {
 }

 func build(target target, tags []string) {
+	if (target.name == "syncthing" || target.name == "") && !withNextGenGUI {
+		log.Println("Notice: Next generation GUI will not be built; see --with-next-gen-gui.")
+	}
+
 	lazyRebuildAssets()
 	tags = append(target.tags, tags...)

@@ -493,6 +510,9 @@ func build(target target, tags []string) {
 	}

 	args := []string{"build", "-v"}
+	if buildOut != "" {
+		args = append(args, "-o", buildOut)
+	}
 	args = appendParameters(args, tags, target.buildPkgs...)
 	runPrint(goCmd, args...)
 }
@@ -526,26 +546,27 @@ func appendParameters(args []string, tags []string, pkgs ...string) []string {

 	if !debugBinary {
 		// Regular binaries get version tagged and skip some debug symbols
-		args = append(args, "-ldflags", ldflags())
+		args = append(args, "-trimpath", "-ldflags", ldflags(tags))
 	} else {
 		// -gcflags to disable optimizations and inlining. Skip -ldflags
 		// because `Could not launch program: decoding dwarf section info at
 		// offset 0x0: too short` on 'dlv exec ...' see
-		// https://github.com/derekparker/delve/issues/79
-		args = append(args, "-gcflags", "-N -l")
+		// https://github.com/go-delve/delve/issues/79
+		args = append(args, "-gcflags", "all=-N -l")
 	}

 	return append(args, pkgs...)
 }

-func buildTar(target target) {
+func buildTar(target target, tags []string) {
 	name := archiveName(target)
 	filename := name + ".tar.gz"

-	var tags []string
-	if noupgrade {
-		tags = []string{"noupgrade"}
-		name += "-noupgrade"
+	for _, tag := range tags {
+		if tag == "noupgrade" {
+			name += "-noupgrade"
+			break
+		}
 	}

 	build(target, tags)
@@ -561,14 +582,15 @@ func buildTar(target target) {
 	fmt.Println(filename)
 }

-func buildZip(target target) {
+func buildZip(target target, tags []string) {
 	name := archiveName(target)
 	filename := name + ".zip"

-	var tags []string
-	if noupgrade {
-		tags = []string{"noupgrade"}
-		name += "-noupgrade"
+	for _, tag := range tags {
+		if tag == "noupgrade" {
+			name += "-noupgrade"
+			break
+		}
 	}

 	build(target, tags)
@@ -636,11 +658,13 @@ func buildDeb(target target) {
 	for _, dep := range target.debdeps {
 		args = append(args, "-d", dep)
 	}
-	for _, service := range target.systemdServices {
-		args = append(args, "--deb-systemd", service)
-	}
-	if target.debpost != "" {
-		args = append(args, "--after-upgrade", target.debpost)
+	if target.systemdService != "" {
+		debpost, err := createPostInstScript(target)
+		defer os.Remove(debpost)
+		if err != nil {
+			log.Fatal(err)
+		}
+		args = append(args, "--after-upgrade", debpost)
 	}
 	if target.debpre != "" {
 		args = append(args, "--before-install", target.debpre)
@@ -648,6 +672,28 @@ func buildDeb(target target) {
 	runPrint("fpm", args...)
 }

+func createPostInstScript(target target) (string, error) {
+	scriptname := filepath.Join("script", "deb-post-inst.template")
+	t, err := template.ParseFiles(scriptname)
+	if err != nil {
+		return "", err
+	}
+	scriptname = strings.TrimSuffix(scriptname, ".template")
+	w, err := os.Create(scriptname)
+	if err != nil {
+		return "", err
+	}
+	defer w.Close()
+	if err = t.Execute(w, struct {
+		Service, Command string
+	}{
+		target.systemdService, target.binaryName,
+	}); err != nil {
+		return "", err
+	}
+	return scriptname, nil
+}
+
 func shouldBuildSyso(dir string) (string, error) {
 	type M map[string]interface{}
 	version := getVersion()
@@ -667,11 +713,14 @@ func shouldBuildSyso(dir string) (string, error) {
 			},
 		},
 		"StringFileInfo": M{
-			"FileDescription": "Open Source Continuous File Synchronization",
-			"LegalCopyright":  "The Syncthing Authors",
-			"FileVersion":     version,
-			"ProductVersion":  version,
-			"ProductName":     "Syncthing",
+			"CompanyName":      "The Syncthing Authors",
+			"FileDescription":  "Syncthing - Open Source Continuous File Synchronization",
+			"FileVersion":      version,
+			"InternalName":     "syncthing",
+			"LegalCopyright":   "The Syncthing Authors",
+			"OriginalFilename": "syncthing",
+			"ProductName":      "Syncthing",
+			"ProductVersion":   version,
 		},
 		"IconPath": "assets/logo.ico",
 	})
@@ -680,7 +729,7 @@ func shouldBuildSyso(dir string) (string, error) {
 	}

 	jsonPath := filepath.Join(dir, "versioninfo.json")
-	err = ioutil.WriteFile(jsonPath, bs, 0644)
+	err = os.WriteFile(jsonPath, bs, 0644)
 	if err != nil {
 		return "", errors.New("failed to create " + jsonPath + ": " + err.Error())
 	}
@@ -693,7 +742,13 @@ func shouldBuildSyso(dir string) (string, error) {

 	sysoPath := filepath.Join(dir, "cmd", "syncthing", "resource.syso")

-	if _, err := runError("goversioninfo", "-o", sysoPath); err != nil {
+	// See https://github.com/josephspurrier/goversioninfo#command-line-flags
+	armOption := ""
+	if strings.Contains(goarch, "arm") {
+		armOption = "-arm=true"
+	}
+
+	if _, err := runError("goversioninfo", "-o", sysoPath, armOption); err != nil {
 		return "", errors.New("failed to create " + sysoPath + ": " + err.Error())
 	}

@@ -713,12 +768,12 @@ func shouldCleanupSyso(sysoFilePath string) {
 // exists. The permission bits are copied as well. If dst already exists and
 // the contents are identical to src the modification time is not updated.
 func copyFile(src, dst string, perm os.FileMode) error {
-	in, err := ioutil.ReadFile(src)
+	in, err := os.ReadFile(src)
 	if err != nil {
 		return err
 	}

-	out, err := ioutil.ReadFile(dst)
+	out, err := os.ReadFile(dst)
 	if err != nil {
 		// The destination probably doesn't exist, we should create
 		// it.
@@ -734,7 +789,7 @@ func copyFile(src, dst string, perm os.FileMode) error {

 copy:
 	os.MkdirAll(filepath.Dir(dst), 0777)
-	if err := ioutil.WriteFile(dst, in, perm); err != nil {
+	if err := os.WriteFile(dst, in, perm); err != nil {
 		return err
 	}

@@ -762,11 +817,46 @@ func rebuildAssets() {
 }

 func lazyRebuildAssets() {
-	if shouldRebuildAssets("lib/api/auto/gui.files.go", "gui") || shouldRebuildAssets("cmd/strelaypoolsrv/auto/gui.files.go", "cmd/strelaypoolsrv/gui") {
+	shouldRebuild := shouldRebuildAssets("lib/api/auto/gui.files.go", "gui") ||
+		shouldRebuildAssets("cmd/strelaypoolsrv/auto/gui.files.go", "cmd/strelaypoolsrv/gui")
+
+	if withNextGenGUI {
+		shouldRebuild = buildNextGenGUI() || shouldRebuild
+	}
+
+	if shouldRebuild {
 		rebuildAssets()
 	}
 }

+func buildNextGenGUI() bool {
+	// Check if we need to run the npm process, and if so also set the flag
+	// to rebuild Go assets afterwards. The index.html is regenerated every
+	// time by the build process. This assumes the new GUI ends up in
+	// next-gen-gui/dist/next-gen-gui.
+
+	if !shouldRebuildAssets("gui/next-gen-gui/index.html", "next-gen-gui") {
+		// The GUI is up to date.
+		return false
+	}
+
+	runPrintInDir("next-gen-gui", "npm", "install")
+	runPrintInDir("next-gen-gui", "npm", "run", "build", "--", "--prod", "--subresource-integrity")
+
+	rmr("gui/tech-ui")
+
+	for _, src := range listFiles("next-gen-gui/dist") {
+		rel, _ := filepath.Rel("next-gen-gui/dist", src)
+		dst := filepath.Join("gui", rel)
+		if err := copyFile(src, dst, 0644); err != nil {
+			fmt.Println("copy:", err)
+			os.Exit(1)
+		}
+	}
+
+	return true
+}
+
 func shouldRebuildAssets(target, srcdir string) bool {
 	info, err := os.Stat(target)
 	if err != nil {
@@ -793,24 +883,45 @@ func shouldRebuildAssets(target, srcdir string) bool {
 	return assetsAreNewer
 }

+func updateDependencies() {
+	runPrint(goCmd, "get", "-u", "./cmd/...")
+	runPrint(goCmd, "mod", "tidy", "-go=1.17", "-compat=1.17")
+
+	// We might have updated the protobuf package and should regenerate to match.
+	proto()
+}
+
 func proto() {
 	pv := protobufVersion()
-	dependencyRepos = append(dependencyRepos,
-		dependencyRepo{path: "protobuf", repo: "https://github.com/gogo/protobuf.git", commit: pv},
-	)
+	repo := "https://github.com/gogo/protobuf.git"
+	path := filepath.Join("repos", "protobuf")

-	runPrint(goCmd, "get", fmt.Sprintf("github.com/gogo/protobuf/protoc-gen-gogofast@%v", pv))
+	runPrint(goCmd, "install", fmt.Sprintf("github.com/gogo/protobuf/protoc-gen-gogofast@%v", pv))
 	os.MkdirAll("repos", 0755)
-	for _, dep := range dependencyRepos {
-		path := filepath.Join("repos", dep.path)
-		if _, err := os.Stat(path); err != nil {
-			runPrintInDir("repos", "git", "clone", dep.repo, dep.path)
-		} else {
-			runPrintInDir(path, "git", "fetch")
-		}
-		runPrintInDir(path, "git", "checkout", dep.commit)
+
+	if _, err := os.Stat(path); err != nil {
+		runPrint("git", "clone", repo, path)
+	} else {
+		runPrintInDir(path, "git", "fetch")
 	}
-	runPrint(goCmd, "generate", "github.com/syncthing/syncthing/lib/...", "github.com/syncthing/syncthing/cmd/stdiscosrv")
+	runPrintInDir(path, "git", "checkout", pv)
+
+	runPrint(goCmd, "generate", "github.com/syncthing/syncthing/cmd/stdiscosrv")
+	runPrint(goCmd, "generate", "proto/generate.go")
+}
+
+func testmocks() {
+	args := []string{
+		"generate",
+		"github.com/syncthing/syncthing/lib/config",
+		"github.com/syncthing/syncthing/lib/connections",
+		"github.com/syncthing/syncthing/lib/discover",
+		"github.com/syncthing/syncthing/lib/events",
+		"github.com/syncthing/syncthing/lib/logger",
+		"github.com/syncthing/syncthing/lib/model",
+		"github.com/syncthing/syncthing/lib/protocol",
+	}
+	runPrint(goCmd, args...)
 }

 func translate() {
@@ -829,13 +940,14 @@ func transifex() {
 	runPrint(goCmd, "run", "../../../../script/transifexdl.go")
 }

-func ldflags() string {
+func ldflags(tags []string) string {
 	b := new(strings.Builder)
 	b.WriteString("-w")
 	fmt.Fprintf(b, " -X github.com/syncthing/syncthing/lib/build.Version=%s", version)
 	fmt.Fprintf(b, " -X github.com/syncthing/syncthing/lib/build.Stamp=%d", buildStamp())
 	fmt.Fprintf(b, " -X github.com/syncthing/syncthing/lib/build.User=%s", buildUser())
 	fmt.Fprintf(b, " -X github.com/syncthing/syncthing/lib/build.Host=%s", buildHost())
+	fmt.Fprintf(b, " -X github.com/syncthing/syncthing/lib/build.Tags=%s", strings.Join(tags, ","))
 	if v := os.Getenv("EXTRA_LDFLAGS"); v != "" {
 		fmt.Fprintf(b, " %s", v)
 	}
@@ -852,7 +964,7 @@ func rmr(paths ...string) {
 }

 func getReleaseVersion() (string, error) {
-	bs, err := ioutil.ReadFile("RELEASE")
+	bs, err := os.ReadFile("RELEASE")
 	if err != nil {
 		return "", err
 	}
@@ -874,7 +986,10 @@ func getGitVersion() (string, error) {
 	}
 	v0 := string(bs)

-	versionRe := regexp.MustCompile(`-([0-9]{1,3}-g[0-9a-f]{5,10})`)
+	// To be more semantic-versionish and ensure proper ordering in our
+	// upgrade process, we make sure there's only one hyphen in the version.
+
+	versionRe := regexp.MustCompile(`-([0-9]{1,3}-g[0-9a-f]{5,10}(-dirty)?)`)
 	if m := versionRe.FindStringSubmatch(vcur); len(m) > 0 {
 		suffix := strings.ReplaceAll(m[1], "-", ".")

@@ -1181,11 +1296,11 @@ func zipFile(out string, files []archiveFile) {

 		if strings.HasSuffix(f.dst, ".txt") {
 			// Text file. Read it and convert line endings.
-			bs, err := ioutil.ReadAll(sf)
+			bs, err := io.ReadAll(sf)
 			if err != nil {
 				log.Fatal(err)
 			}
-			bs = bytes.Replace(bs, []byte{'\n'}, []byte{'\n', '\r'}, -1)
+			bs = bytes.Replace(bs, []byte{'\n'}, []byte{'\r', '\n'}, -1)
 			fh.UncompressedSize = uint32(len(bs))
 			fh.UncompressedSize64 = uint64(len(bs))

@@ -1292,32 +1407,6 @@ func metalintShort() {
 	runPrint(goCmd, "test", "-short", "-run", "Metalint", "./meta")
 }

-func temporaryBuildDir() (string, error) {
-	// The base of our temp dir is "syncthing-xxxxxxxx" where the x:es
-	// are eight bytes from the sha256 of our working directory. We do
-	// this because we want a name in the global temp dir that doesn't
-	// conflict with someone else building syncthing on the same
-	// machine, yet is persistent between runs from the same source
-	// directory.
-	wd, err := os.Getwd()
-	if err != nil {
-		return "", err
-	}
-	hash := sha256.Sum256([]byte(wd))
-	base := fmt.Sprintf("syncthing-%x", hash[:4])
-
-	// The temp dir is taken from $STTMPDIR if set, otherwise the system
-	// default (potentially infrluenced by $TMPDIR on unixes).
-	var tmpDir string
-	if t := os.Getenv("STTMPDIR"); t != "" {
-		tmpDir = t
-	} else {
-		tmpDir = os.TempDir()
-	}
-
-	return filepath.Join(tmpDir, base), nil
-}
-
 func (t target) BinaryName() string {
 	if goos == "windows" {
 		return t.binaryName + ".exe"
--- a/cmd/stcli/client.go
+++ b/cmd/stcli/client.go
@@ -1,96 +0,0 @@
-// Copyright (C) 2019 The Syncthing Authors.
-//
-// This Source Code Form is subject to the terms of the Mozilla Public
-// License, v. 2.0. If a copy of the MPL was not distributed with this file,
-// You can obtain one at https://mozilla.org/MPL/2.0/.
-
-package main
-
-import (
-	"bytes"
-	"context"
-	"crypto/tls"
-	"errors"
-	"fmt"
-	"net"
-	"net/http"
-	"strings"
-
-	"github.com/syncthing/syncthing/lib/config"
-)
-
-type APIClient struct {
-	http.Client
-	cfg    config.GUIConfiguration
-	apikey string
-}
-
-func getClient(cfg config.GUIConfiguration) *APIClient {
-	httpClient := http.Client{
-		Transport: &http.Transport{
-			TLSClientConfig: &tls.Config{
-				InsecureSkipVerify: true,
-			},
-			DialContext: func(_ context.Context, _, _ string) (net.Conn, error) {
-				return net.Dial(cfg.Network(), cfg.Address())
-			},
-		},
-	}
-	return &APIClient{
-		Client: httpClient,
-		cfg:    cfg,
-		apikey: cfg.APIKey,
-	}
-}
-
-func (c *APIClient) Endpoint() string {
-	if c.cfg.Network() == "unix" {
-		return "http://unix/"
-	}
-	url := c.cfg.URL()
-	if !strings.HasSuffix(url, "/") {
-		url += "/"
-	}
-	return url
-}
-
-func (c *APIClient) Do(req *http.Request) (*http.Response, error) {
-	req.Header.Set("X-API-Key", c.apikey)
-	resp, err := c.Client.Do(req)
-	if err != nil {
-		return nil, err
-	}
-	return resp, checkResponse(resp)
-}
-
-func (c *APIClient) Get(url string) (*http.Response, error) {
-	request, err := http.NewRequest("GET", c.Endpoint()+"rest/"+url, nil)
-	if err != nil {
-		return nil, err
-	}
-	return c.Do(request)
-}
-
-func (c *APIClient) Post(url, body string) (*http.Response, error) {
-	request, err := http.NewRequest("POST", c.Endpoint()+"rest/"+url, bytes.NewBufferString(body))
-	if err != nil {
-		return nil, err
-	}
-	return c.Do(request)
-}
-
-func checkResponse(response *http.Response) error {
-	if response.StatusCode == 404 {
-		return errors.New("invalid endpoint or API call")
-	} else if response.StatusCode == 403 {
-		return errors.New("invalid API key")
-	} else if response.StatusCode != 200 {
-		data, err := responseToBArray(response)
-		if err != nil {
-			return err
-		}
-		body := strings.TrimSpace(string(data))
-		return fmt.Errorf("unexpected HTTP status returned: %s\n%s", response.Status, body)
-	}
-	return nil
-}
--- a/cmd/stcli/main.go
+++ b/cmd/stcli/main.go
@@ -1,192 +0,0 @@
-// Copyright (C) 2019 The Syncthing Authors.
-//
-// This Source Code Form is subject to the terms of the Mozilla Public
-// License, v. 2.0. If a copy of the MPL was not distributed with this file,
-// You can obtain one at https://mozilla.org/MPL/2.0/.
-
-package main
-
-import (
-	"bufio"
-	"crypto/tls"
-	"encoding/json"
-	"flag"
-	"log"
-	"os"
-	"reflect"
-
-	"github.com/AudriusButkevicius/recli"
-	"github.com/flynn-archive/go-shlex"
-	"github.com/mattn/go-isatty"
-	"github.com/pkg/errors"
-	"github.com/syncthing/syncthing/lib/build"
-	"github.com/syncthing/syncthing/lib/config"
-	"github.com/syncthing/syncthing/lib/events"
-	"github.com/syncthing/syncthing/lib/locations"
-	"github.com/syncthing/syncthing/lib/protocol"
-	"github.com/urfave/cli"
-)
-
-func main() {
-	// This is somewhat a hack around a chicken and egg problem.
-	// We need to set the home directory and potentially other flags to know where the syncthing instance is running
-	// in order to get it's config ... which we then use to construct the actual CLI ... at which point it's too late
-	// to add flags there...
-	homeBaseDir := locations.GetBaseDir(locations.ConfigBaseDir)
-	guiCfg := config.GUIConfiguration{}
-
-	flags := flag.NewFlagSet("", flag.ContinueOnError)
-	flags.StringVar(&guiCfg.RawAddress, "gui-address", guiCfg.RawAddress, "Override GUI address (e.g. \"http://192.0.2.42:8443\")")
-	flags.StringVar(&guiCfg.APIKey, "gui-apikey", guiCfg.APIKey, "Override GUI API key")
-	flags.StringVar(&homeBaseDir, "home", homeBaseDir, "Set configuration directory")
-
-	// Implement the same flags at the lower CLI, with the same default values (pre-parse), but do nothing with them.
-	// This is so that we could reuse os.Args
-	fakeFlags := []cli.Flag{
-		cli.StringFlag{
-			Name:  "gui-address",
-			Value: guiCfg.RawAddress,
-			Usage: "Override GUI address (e.g. \"http://192.0.2.42:8443\")",
-		},
-		cli.StringFlag{
-			Name:  "gui-apikey",
-			Value: guiCfg.APIKey,
-			Usage: "Override GUI API key",
-		},
-		cli.StringFlag{
-			Name:  "home",
-			Value: homeBaseDir,
-			Usage: "Set configuration directory",
-		},
-	}
-
-	// Do not print usage of these flags, and ignore errors as this can't understand plenty of things
-	flags.Usage = func() {}
-	_ = flags.Parse(os.Args[1:])
-
-	// Now if the API key and address is not provided (we are not connecting to a remote instance),
-	// try to rip it out of the config.
-	if guiCfg.RawAddress == "" && guiCfg.APIKey == "" {
-		// Update the base directory
-		err := locations.SetBaseDir(locations.ConfigBaseDir, homeBaseDir)
-		if err != nil {
-			log.Fatal(errors.Wrap(err, "setting home"))
-		}
-
-		// Load the certs and get the ID
-		cert, err := tls.LoadX509KeyPair(
-			locations.Get(locations.CertFile),
-			locations.Get(locations.KeyFile),
-		)
-		if err != nil {
-			log.Fatal(errors.Wrap(err, "reading device ID"))
-		}
-
-		myID := protocol.NewDeviceID(cert.Certificate[0])
-
-		// Load the config
-		cfg, err := config.Load(locations.Get(locations.ConfigFile), myID, events.NoopLogger)
-		if err != nil {
-			log.Fatalln(errors.Wrap(err, "loading config"))
-		}
-
-		guiCfg = cfg.GUI()
-	} else if guiCfg.Address() == "" || guiCfg.APIKey == "" {
-		log.Fatalln("Both -gui-address and -gui-apikey should be specified")
-	}
-
-	if guiCfg.Address() == "" {
-		log.Fatalln("Could not find GUI Address")
-	}
-
-	if guiCfg.APIKey == "" {
-		log.Fatalln("Could not find GUI API key")
-	}
-
-	client := getClient(guiCfg)
-
-	cfg, err := getConfig(client)
-	original := cfg.Copy()
-	if err != nil {
-		log.Fatalln(errors.Wrap(err, "getting config"))
-	}
-
-	// Copy the config and set the default flags
-	recliCfg := recli.DefaultConfig
-	recliCfg.IDTag.Name = "xml"
-	recliCfg.SkipTag.Name = "json"
-
-	commands, err := recli.New(recliCfg).Construct(&cfg)
-	if err != nil {
-		log.Fatalln(errors.Wrap(err, "config reflect"))
-	}
-
-	// Construct the actual CLI
-	app := cli.NewApp()
-	app.Name = "stcli"
-	app.HelpName = app.Name
-	app.Author = "The Syncthing Authors"
-	app.Usage = "Syncthing command line interface"
-	app.Version = build.Version
-	app.Flags = fakeFlags
-	app.Metadata = map[string]interface{}{
-		"client": client,
-	}
-	app.Commands = []cli.Command{
-		{
-			Name:        "config",
-			HideHelp:    true,
-			Usage:       "Configuration modification command group",
-			Subcommands: commands,
-		},
-		showCommand,
-		operationCommand,
-		errorsCommand,
-	}
-
-	tty := isatty.IsTerminal(os.Stdin.Fd()) || isatty.IsCygwinTerminal(os.Stdin.Fd())
-	if !tty {
-		// Not a TTY, consume from stdin
-		scanner := bufio.NewScanner(os.Stdin)
-		for scanner.Scan() {
-			input, err := shlex.Split(scanner.Text())
-			if err != nil {
-				log.Fatalln(errors.Wrap(err, "parsing input"))
-			}
-			if len(input) == 0 {
-				continue
-			}
-			err = app.Run(append(os.Args, input...))
-			if err != nil {
-				log.Fatalln(err)
-			}
-		}
-		err = scanner.Err()
-		if err != nil {
-			log.Fatalln(err)
-		}
-	} else {
-		err = app.Run(os.Args)
-		if err != nil {
-			log.Fatalln(err)
-		}
-	}
-
-	if !reflect.DeepEqual(cfg, original) {
-		body, err := json.MarshalIndent(cfg, "", "  ")
-		if err != nil {
-			log.Fatalln(err)
-		}
-		resp, err := client.Post("system/config", string(body))
-		if err != nil {
-			log.Fatalln(err)
-		}
-		if resp.StatusCode != 200 {
-			body, err := responseToBArray(resp)
-			if err != nil {
-				log.Fatalln(err)
-			}
-			log.Fatalln(string(body))
-		}
-	}
-}
--- a/cmd/stcli/utils.go
+++ b/cmd/stcli/utils.go
@@ -1,94 +0,0 @@
-// Copyright (C) 2019 The Syncthing Authors.
-//
-// This Source Code Form is subject to the terms of the Mozilla Public
-// License, v. 2.0. If a copy of the MPL was not distributed with this file,
-// You can obtain one at https://mozilla.org/MPL/2.0/.
-
-package main
-
-import (
-	"encoding/json"
-	"fmt"
-	"io/ioutil"
-	"net/http"
-	"os"
-
-	"github.com/syncthing/syncthing/lib/config"
-	"github.com/urfave/cli"
-)
-
-func responseToBArray(response *http.Response) ([]byte, error) {
-	bytes, err := ioutil.ReadAll(response.Body)
-	if err != nil {
-		return nil, err
-	}
-	return bytes, response.Body.Close()
-}
-
-func emptyPost(url string) cli.ActionFunc {
-	return func(c *cli.Context) error {
-		client := c.App.Metadata["client"].(*APIClient)
-		_, err := client.Post(url, "")
-		return err
-	}
-}
-
-func dumpOutput(url string) cli.ActionFunc {
-	return func(c *cli.Context) error {
-		client := c.App.Metadata["client"].(*APIClient)
-		response, err := client.Get(url)
-		if err != nil {
-			return err
-		}
-		return prettyPrintResponse(c, response)
-	}
-}
-
-func getConfig(c *APIClient) (config.Configuration, error) {
-	cfg := config.Configuration{}
-	response, err := c.Get("system/config")
-	if err != nil {
-		return cfg, err
-	}
-	bytes, err := responseToBArray(response)
-	if err != nil {
-		return cfg, err
-	}
-	err = json.Unmarshal(bytes, &cfg)
-	if err == nil {
-		return cfg, err
-	}
-	return cfg, nil
-}
-
-func expects(n int, actionFunc cli.ActionFunc) cli.ActionFunc {
-	return func(ctx *cli.Context) error {
-		if ctx.NArg() != n {
-			plural := ""
-			if n != 1 {
-				plural = "s"
-			}
-			return fmt.Errorf("expected %d argument%s, got %d", n, plural, ctx.NArg())
-		}
-		return actionFunc(ctx)
-	}
-}
-
-func prettyPrintJSON(data interface{}) error {
-	enc := json.NewEncoder(os.Stdout)
-	enc.SetIndent("", "  ")
-	return enc.Encode(data)
-}
-
-func prettyPrintResponse(c *cli.Context, response *http.Response) error {
-	bytes, err := responseToBArray(response)
-	if err != nil {
-		return err
-	}
-	var data interface{}
-	if err := json.Unmarshal(bytes, &data); err != nil {
-		return err
-	}
-	// TODO: Check flag for pretty print format
-	return prettyPrintJSON(data)
-}
--- a/cmd/stcompdirs/main.go
+++ b/cmd/stcompdirs/main.go
@@ -7,7 +7,6 @@
 package main

 import (
-	"crypto/md5"
 	"errors"
 	"flag"
 	"fmt"
@@ -15,6 +14,8 @@ import (
 	"log"
 	"os"
 	"path/filepath"
+
+	"github.com/syncthing/syncthing/lib/sha256"
 )

 func main() {
@@ -74,7 +75,7 @@ type fileInfo struct {
 	name string
 	mode os.FileMode
 	mod  int64
-	hash [16]byte
+	hash [sha256.Size]byte
 }

 func (f fileInfo) String() string {
@@ -106,11 +107,7 @@ func startWalker(dir string, res chan<- fileInfo, abort <-chan struct{}) chan er
 			if err != nil {
 				return err
 			}
-			h := md5.New()
-			h.Write([]byte(tgt))
-			hash := h.Sum(nil)
-
-			copy(f.hash[:], hash)
+			f.hash = sha256.Sum256([]byte(tgt))
 		} else if info.IsDir() {
 			f = fileInfo{
 				name: rn,
@@ -123,7 +120,7 @@ func startWalker(dir string, res chan<- fileInfo, abort <-chan struct{}) chan er
 				mode: info.Mode(),
 				mod:  info.ModTime().Unix(),
 			}
-			sum, err := md5file(path)
+			sum, err := sha256file(path)
 			if err != nil {
 				return err
 			}
@@ -150,14 +147,14 @@ func startWalker(dir string, res chan<- fileInfo, abort <-chan struct{}) chan er
 	return errc
 }

-func md5file(fname string) (hash [16]byte, err error) {
+func sha256file(fname string) (hash [sha256.Size]byte, err error) {
 	f, err := os.Open(fname)
 	if err != nil {
 		return
 	}
 	defer f.Close()

-	h := md5.New()
+	h := sha256.New()
 	io.Copy(h, f)
 	hb := h.Sum(nil)
 	copy(hash[:], hb)
--- a/cmd/stcrashreceiver/main.go
+++ b/cmd/stcrashreceiver/main.go
@@ -0,0 +1,125 @@
+// Copyright (C) 2019 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+// Command stcrashreceiver is a trivial HTTP server that allows two things:
+//
+// - uploading files (crash reports) named like a SHA256 hash using a PUT request
+// - checking whether such file exists using a HEAD request
+//
+// Typically this should be deployed behind something that manages HTTPS.
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"path/filepath"
+
+	"github.com/syncthing/syncthing/lib/sha256"
+	"github.com/syncthing/syncthing/lib/ur"
+
+	raven "github.com/getsentry/raven-go"
+)
+
+const maxRequestSize = 1 << 20 // 1 MiB
+
+func main() {
+	dir := flag.String("dir", ".", "Parent directory to store crash and failure reports in")
+	dsn := flag.String("dsn", "", "Sentry DSN")
+	listen := flag.String("listen", ":22039", "HTTP listen address")
+	flag.Parse()
+
+	mux := http.NewServeMux()
+
+	cr := &crashReceiver{
+		dir: filepath.Join(*dir, "crash_reports"),
+		dsn: *dsn,
+	}
+	mux.Handle("/", cr)
+
+	if *dsn != "" {
+		mux.HandleFunc("/newcrash/failure", handleFailureFn(*dsn, filepath.Join(*dir, "failure_reports")))
+	}
+
+	log.SetOutput(os.Stdout)
+	if err := http.ListenAndServe(*listen, mux); err != nil {
+		log.Fatalln("HTTP serve:", err)
+	}
+}
+
+func handleFailureFn(dsn, failureDir string) func(w http.ResponseWriter, req *http.Request) {
+	return func(w http.ResponseWriter, req *http.Request) {
+		lr := io.LimitReader(req.Body, maxRequestSize)
+		bs, err := io.ReadAll(lr)
+		req.Body.Close()
+		if err != nil {
+			http.Error(w, err.Error(), 500)
+			return
+		}
+
+		var reports []ur.FailureReport
+		err = json.Unmarshal(bs, &reports)
+		if err != nil {
+			http.Error(w, err.Error(), 400)
+			return
+		}
+		if len(reports) == 0 {
+			// Shouldn't happen
+			log.Printf("Got zero failure reports")
+			return
+		}
+
+		version, err := parseVersion(reports[0].Version)
+		if err != nil {
+			http.Error(w, err.Error(), 400)
+			return
+		}
+		for _, r := range reports {
+			pkt := packet(version, "failure")
+			pkt.Message = r.Description
+			pkt.Extra = raven.Extra{
+				"count": r.Count,
+			}
+			for k, v := range r.Extra {
+				pkt.Extra[k] = v
+			}
+			if r.Goroutines != "" {
+				url, err := saveFailureWithGoroutines(r.FailureData, failureDir)
+				if err != nil {
+					log.Println("Saving failure report:", err)
+					http.Error(w, "Internal server error", http.StatusInternalServerError)
+					return
+				}
+				pkt.Extra["goroutinesURL"] = url
+			}
+			message := sanitizeMessageLDB(r.Description)
+			pkt.Fingerprint = []string{message}
+
+			if err := sendReport(dsn, pkt, userIDFor(req)); err != nil {
+				log.Println("Failed to send failure report:", err)
+			} else {
+				log.Println("Sent failure report:", r.Description)
+			}
+		}
+	}
+}
+
+func saveFailureWithGoroutines(data ur.FailureData, failureDir string) (string, error) {
+	bs := make([]byte, len(data.Description)+len(data.Goroutines))
+	copy(bs, data.Description)
+	copy(bs[len(data.Description):], data.Goroutines)
+	id := fmt.Sprintf("%x", sha256.Sum256(bs))
+	path := fullPathCompressed(failureDir, id)
+	err := compressAndWrite(bs, path)
+	if err != nil {
+		return "", err
+	}
+	return reportServer + path, nil
+}
--- a/cmd/stcrashreceiver/sentry.go
+++ b/cmd/stcrashreceiver/sentry.go
@@ -9,7 +9,7 @@ package main
 import (
 	"bytes"
 	"errors"
-	"io/ioutil"
+	"io"
 	"regexp"
 	"strings"
 	"sync"
@@ -31,12 +31,7 @@ var (
 	clientsMut sync.Mutex
 )

-func sendReport(dsn, path string, report []byte, userID string) error {
-	pkt, err := parseReport(path, report)
-	if err != nil {
-		return err
-	}
-
+func sendReport(dsn string, pkt *raven.Packet, userID string) error {
 	pkt.Interfaces = append(pkt.Interfaces, &raven.User{ID: userID})

 	clientsMut.Lock()
@@ -44,6 +39,7 @@ func sendReport(dsn, path string, report []byte, userID string) error {

 	cli, ok := clients[dsn]
 	if !ok {
+		var err error
 		cli, err = raven.New(dsn)
 		if err != nil {
 			return err
@@ -62,7 +58,7 @@ func sendReport(dsn, path string, report []byte, userID string) error {
 	return <-errC
 }

-func parseReport(path string, report []byte) (*raven.Packet, error) {
+func parseCrashReport(path string, report []byte) (*raven.Packet, error) {
 	parts := bytes.SplitN(report, []byte("\n"), 2)
 	if len(parts) != 2 {
 		return nil, errors.New("no first line")
@@ -97,7 +93,7 @@ func parseReport(path string, report []byte) (*raven.Packet, error) {
 	}

 	r := bytes.NewReader(report)
-	ctx, err := stack.ParseDump(r, ioutil.Discard, false)
+	ctx, err := stack.ParseDump(r, io.Discard, false)
 	if err != nil {
 		return nil, err
 	}
@@ -126,35 +122,55 @@ func parseReport(path string, report []byte) (*raven.Packet, error) {
 		}
 	}

-	pkt := &raven.Packet{
-		Message:     string(subjectLine),
-		Platform:    "go",
-		Release:     version.tag,
-		Environment: version.environment(),
-		Tags: raven.Tags{
-			raven.Tag{Key: "version", Value: version.version},
-			raven.Tag{Key: "tag", Value: version.tag},
-			raven.Tag{Key: "codename", Value: version.codename},
-			raven.Tag{Key: "runtime", Value: version.runtime},
-			raven.Tag{Key: "goos", Value: version.goos},
-			raven.Tag{Key: "goarch", Value: version.goarch},
-			raven.Tag{Key: "builder", Value: version.builder},
-		},
-		Extra: raven.Extra{
-			"url": reportServer + path,
-		},
-		Interfaces: []raven.Interface{&trace},
-	}
-	if version.commit != "" {
-		pkt.Tags = append(pkt.Tags, raven.Tag{Key: "commit", Value: version.commit})
-	}
-	for _, tag := range version.extra {
-		pkt.Tags = append(pkt.Tags, raven.Tag{Key: tag, Value: "1"})
+	pkt := packet(version, "crash")
+	pkt.Message = string(subjectLine)
+	pkt.Extra = raven.Extra{
+		"url": reportServer + path,
 	}
+	pkt.Interfaces = []raven.Interface{&trace}
+	pkt.Fingerprint = crashReportFingerprint(pkt.Message)

 	return pkt, nil
 }

+var (
+	indexRe          = regexp.MustCompile(`\[[-:0-9]+\]`)
+	sizeRe           = regexp.MustCompile(`(length|capacity) [0-9]+`)
+	ldbPosRe         = regexp.MustCompile(`(\(pos=)([0-9]+)\)`)
+	ldbChecksumRe    = regexp.MustCompile(`(want=0x)([a-z0-9]+)( got=0x)([a-z0-9]+)`)
+	ldbFileRe        = regexp.MustCompile(`(\[file=)([0-9]+)(\.ldb\])`)
+	ldbInternalKeyRe = regexp.MustCompile(`(internal key ")[^"]+(", len=)[0-9]+`)
+	ldbPathRe        = regexp.MustCompile(`(open|write|read) .+[\\/].+[\\/]index[^\\/]+[\\/][^\\/]+: `)
+)
+
+func sanitizeMessageLDB(message string) string {
+	message = ldbPosRe.ReplaceAllString(message, "${1}x)")
+	message = ldbFileRe.ReplaceAllString(message, "${1}x${3}")
+	message = ldbChecksumRe.ReplaceAllString(message, "${1}X${3}X")
+	message = ldbInternalKeyRe.ReplaceAllString(message, "${1}x${2}x")
+	message = ldbPathRe.ReplaceAllString(message, "$1 x: ")
+	return message
+}
+
+func crashReportFingerprint(message string) []string {
+	// Do not fingerprint on the stack in case of db corruption or fatal
+	// db io error - where it occurs doesn't matter.
+	orig := message
+	message = sanitizeMessageLDB(message)
+	if message != orig {
+		return []string{message}
+	}
+
+	message = indexRe.ReplaceAllString(message, "[x]")
+	message = sizeRe.ReplaceAllString(message, "$1 x")
+
+	// {{ default }} is what sentry uses as a fingerprint by default. While
+	// never specified, the docs point at this being some hash derived from the
+	// stack trace. Here we include the filtered panic message on top of that.
+	// https://docs.sentry.io/platforms/go/data-management/event-grouping/sdk-fingerprinting/#basic-example
+	return []string{"{{ default }}", message}
+}
+
 // syncthing v1.1.4-rc.1+30-g6aaae618-dirty-crashrep "Erbium Earthworm" (go1.12.5 darwin-amd64) jb@kvin.kastelo.net 2019-05-23 16:08:14 UTC [foo, bar]
 var longVersionRE = regexp.MustCompile(`syncthing\s+(v[^\s]+)\s+"([^"]+)"\s\(([^\s]+)\s+([^-]+)-([^)]+)\)\s+([^\s]+)[^\[]*(?:\[(.+)\])?$`)

@@ -217,3 +233,28 @@ func parseVersion(line string) (version, error) {

 	return v, nil
 }
+
+func packet(version version, reportType string) *raven.Packet {
+	pkt := &raven.Packet{
+		Platform:    "go",
+		Release:     version.tag,
+		Environment: version.environment(),
+		Tags: raven.Tags{
+			raven.Tag{Key: "version", Value: version.version},
+			raven.Tag{Key: "tag", Value: version.tag},
+			raven.Tag{Key: "codename", Value: version.codename},
+			raven.Tag{Key: "runtime", Value: version.runtime},
+			raven.Tag{Key: "goos", Value: version.goos},
+			raven.Tag{Key: "goarch", Value: version.goarch},
+			raven.Tag{Key: "builder", Value: version.builder},
+			raven.Tag{Key: "report_type", Value: reportType},
+		},
+	}
+	if version.commit != "" {
+		pkt.Tags = append(pkt.Tags, raven.Tag{Key: "commit", Value: version.commit})
+	}
+	for _, tag := range version.extra {
+		pkt.Tags = append(pkt.Tags, raven.Tag{Key: tag, Value: "1"})
+	}
+	return pkt
+}
--- a/cmd/stcrashreceiver/sentry_test.go
+++ b/cmd/stcrashreceiver/sentry_test.go
@@ -8,7 +8,7 @@ package main

 import (
 	"fmt"
-	"io/ioutil"
+	"os"
 	"testing"
 )

@@ -59,12 +59,12 @@ func TestParseVersion(t *testing.T) {
 }

 func TestParseReport(t *testing.T) {
-	bs, err := ioutil.ReadFile("_testdata/panic.log")
+	bs, err := os.ReadFile("_testdata/panic.log")
 	if err != nil {
 		t.Fatal(err)
 	}

-	pkt, err := parseReport("1/2/345", bs)
+	pkt, err := parseCrashReport("1/2/345", bs)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -76,3 +76,66 @@ func TestParseReport(t *testing.T) {

 	fmt.Printf("%s\n", bs)
 }
+
+func TestCrashReportFingerprint(t *testing.T) {
+	cases := []struct {
+		message, exp string
+		ldb          bool
+	}{
+		{
+			message: "panic: leveldb/table: corruption on data-block (pos=51308946): checksum mismatch, want=0xa89f9aa0 got=0xd27cc4c7 [file=004003.ldb]",
+			exp:     "panic: leveldb/table: corruption on data-block (pos=x): checksum mismatch, want=0xX got=0xX [file=x.ldb]",
+			ldb:     true,
+		},
+		{
+			message: "panic: leveldb/table: corruption on table-footer (pos=248): bad magic number [file=001370.ldb]",
+			exp:     "panic: leveldb/table: corruption on table-footer (pos=x): bad magic number [file=x.ldb]",
+			ldb:     true,
+		},
+		{
+			message: "panic: runtime error: slice bounds out of range [4294967283:4194304]",
+			exp:     "panic: runtime error: slice bounds out of range [x]",
+		},
+		{
+			message: "panic: runtime error: slice bounds out of range [-2:]",
+			exp:     "panic: runtime error: slice bounds out of range [x]",
+		},
+		{
+			message: "panic: runtime error: slice bounds out of range [:4294967283] with capacity 32768",
+			exp:     "panic: runtime error: slice bounds out of range [x] with capacity x",
+		},
+		{
+			message: "panic: runtime error: index out of range [0] with length 0",
+			exp:     "panic: runtime error: index out of range [x] with length x",
+		},
+		{
+			message: `panic: leveldb: internal key "\x01", len=1: invalid length`,
+			exp:     `panic: leveldb: internal key "x", len=x: invalid length`,
+			ldb:     true,
+		},
+		{
+			message: `panic: write /var/syncthing/config/index-v0.14.0.db/2732813.log: cannot allocate memory`,
+			exp:     `panic: write x: cannot allocate memory`,
+			ldb:     true,
+		},
+		{
+			message: `panic: filling Blocks: read C:\Users\Serv-Resp-Tizayuca\AppData\Local\Syncthing\index-v0.14.0.db\006561.ldb: Error de datos (comprobación de redundancia cíclica).`,
+			exp:     `panic: filling Blocks: read x: Error de datos (comprobación de redundancia cíclica).`,
+			ldb:     true,
+		},
+	}
+
+	for i, tc := range cases {
+		fingerprint := crashReportFingerprint(tc.message)
+
+		expLen := 2
+		if tc.ldb {
+			expLen = 1
+		}
+		if l := len(fingerprint); l != expLen {
+			t.Errorf("tc %v: Unexpected fingerprint length: %v != %v", i, l, expLen)
+		} else if msg := fingerprint[expLen-1]; msg != tc.exp {
+			t.Errorf("tc %v:\n\"%v\" !=\n\"%v\"", i, msg, tc.exp)
+		}
+	}
+}
--- a/cmd/stcrashreceiver/sourcecodeloader.go
+++ b/cmd/stcrashreceiver/sourcecodeloader.go
@@ -9,7 +9,7 @@ package main
 import (
 	"bytes"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"path/filepath"
 	"strings"
@@ -72,11 +72,15 @@ func (l *githubSourceCodeLoader) Load(filename string, line, context int) ([][]b
 		url := urlPrefix + l.version + filename[idx:]
 		resp, err := l.client.Get(url)

-		if err != nil || resp.StatusCode != http.StatusOK {
-			fmt.Println("Loading source:", err.Error())
+		if err != nil {
+			fmt.Println("Loading source:", err)
 			return nil, 0
 		}
-		data, err := ioutil.ReadAll(resp.Body)
+		if resp.StatusCode != http.StatusOK {
+			fmt.Println("Loading source:", resp.Status)
+			return nil, 0
+		}
+		data, err := io.ReadAll(resp.Body)
 		_ = resp.Body.Close()
 		if err != nil {
 			fmt.Println("Loading source:", err.Error())
--- a/cmd/stcrashreceiver/stcrashreceiver.go
+++ b/cmd/stcrashreceiver/stcrashreceiver.go
@@ -4,52 +4,20 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

-// Command stcrashreceiver is a trivial HTTP server that allows two things:
-//
-// - uploading files (crash reports) named like a SHA256 hash using a PUT request
-// - checking whether such file exists using a HEAD request
-//
-// Typically this should be deployed behind something that manages HTTPS.
 package main

 import (
 	"bytes"
 	"compress/gzip"
-	"flag"
-	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
-	"net"
 	"net/http"
 	"os"
 	"path"
 	"path/filepath"
 	"strings"
-	"time"
-
-	"github.com/syncthing/syncthing/lib/sha256"
 )

-const maxRequestSize = 1 << 20 // 1 MiB
-
-func main() {
-	dir := flag.String("dir", ".", "Directory to store reports in")
-	dsn := flag.String("dsn", "", "Sentry DSN")
-	listen := flag.String("listen", ":22039", "HTTP listen address")
-	flag.Parse()
-
-	cr := &crashReceiver{
-		dir: *dir,
-		dsn: *dsn,
-	}
-
-	log.SetOutput(os.Stdout)
-	if err := http.ListenAndServe(*listen, cr); err != nil {
-		log.Fatalln("HTTP serve:", err)
-	}
-}
-
 type crashReceiver struct {
 	dir string
 	dsn string
@@ -91,7 +59,7 @@ func (r *crashReceiver) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 }

 // serveGet responds to GET requests by serving the uncompressed report.
-func (r *crashReceiver) serveGet(fullPath string, w http.ResponseWriter, _ *http.Request) {
+func (*crashReceiver) serveGet(fullPath string, w http.ResponseWriter, _ *http.Request) {
 	fd, err := os.Open(fullPath)
 	if err != nil {
 		http.Error(w, "Not found", http.StatusNotFound)
@@ -109,7 +77,7 @@ func (r *crashReceiver) serveGet(fullPath string, w http.ResponseWriter, _ *http

 // serveHead responds to HEAD requests by checking if the named report
 // already exists in the system.
-func (r *crashReceiver) serveHead(fullPath string, w http.ResponseWriter, _ *http.Request) {
+func (*crashReceiver) serveHead(fullPath string, w http.ResponseWriter, _ *http.Request) {
 	if _, err := os.Lstat(fullPath); err != nil {
 		http.Error(w, "Not found", http.StatusNotFound)
 	}
@@ -127,7 +95,7 @@ func (r *crashReceiver) servePut(reportID, fullPath string, w http.ResponseWrite
 	// Read at most maxRequestSize of report data.
 	log.Println("Receiving report", reportID)
 	lr := io.LimitReader(req.Body, maxRequestSize)
-	bs, err := ioutil.ReadAll(lr)
+	bs, err := io.ReadAll(lr)
 	if err != nil {
 		log.Println("Reading report:", err)
 		http.Error(w, "Internal server error", http.StatusInternalServerError)
@@ -141,7 +109,7 @@ func (r *crashReceiver) servePut(reportID, fullPath string, w http.ResponseWrite
 	gw.Close()

 	// Create an output file with the compressed report
-	err = ioutil.WriteFile(fullPath, buf.Bytes(), 0644)
+	err = os.WriteFile(fullPath, buf.Bytes(), 0644)
 	if err != nil {
 		log.Println("Saving report:", err)
 		http.Error(w, "Internal server error", http.StatusInternalServerError)
@@ -155,31 +123,19 @@ func (r *crashReceiver) servePut(reportID, fullPath string, w http.ResponseWrite

 		go func() {
 			// There's no need for the client to have to wait for this part.
-			if err := sendReport(r.dsn, reportID, bs, user); err != nil {
-				log.Println("Failed to send report:", err)
+			pkt, err := parseCrashReport(reportID, bs)
+			if err != nil {
+				log.Println("Failed to parse crash report:", err)
+				return
+			}
+			if err := sendReport(r.dsn, pkt, user); err != nil {
+				log.Println("Failed to send crash report:", err)
 			}
 		}()
 	}
 }

 // 01234567890abcdef... => 01/23
-func (r *crashReceiver) dirFor(base string) string {
+func (*crashReceiver) dirFor(base string) string {
 	return filepath.Join(base[0:2], base[2:4])
 }
-
-// userIDFor returns a string we can use as the user ID for the purpose of
-// counting affected users. It's the truncated hash of a salt, the user
-// remote IP, and the current month.
-func userIDFor(req *http.Request) string {
-	addr := req.RemoteAddr
-	if fwd := req.Header.Get("x-forwarded-for"); fwd != "" {
-		addr = fwd
-	}
-	if host, _, err := net.SplitHostPort(addr); err == nil {
-		addr = host
-	}
-	now := time.Now().Format("200601")
-	salt := "stcrashreporter"
-	hash := sha256.Sum256([]byte(salt + addr + now))
-	return fmt.Sprintf("%x", hash[:8])
-}
--- a/cmd/stcrashreceiver/util.go
+++ b/cmd/stcrashreceiver/util.go
@@ -0,0 +1,57 @@
+// Copyright (C) 2021 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package main
+
+import (
+	"bytes"
+	"compress/gzip"
+	"fmt"
+	"net"
+	"net/http"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/syncthing/syncthing/lib/sha256"
+)
+
+// userIDFor returns a string we can use as the user ID for the purpose of
+// counting affected users. It's the truncated hash of a salt, the user
+// remote IP, and the current month.
+func userIDFor(req *http.Request) string {
+	addr := req.RemoteAddr
+	if fwd := req.Header.Get("x-forwarded-for"); fwd != "" {
+		addr = fwd
+	}
+	if host, _, err := net.SplitHostPort(addr); err == nil {
+		addr = host
+	}
+	now := time.Now().Format("200601")
+	salt := "stcrashreporter"
+	hash := sha256.Sum256([]byte(salt + addr + now))
+	return fmt.Sprintf("%x", hash[:8])
+}
+
+// 01234567890abcdef... => 01/23
+func dirFor(base string) string {
+	return filepath.Join(base[0:2], base[2:4])
+}
+
+func fullPathCompressed(root, reportID string) string {
+	return filepath.Join(root, dirFor(reportID), reportID) + ".gz"
+}
+
+func compressAndWrite(bs []byte, fullPath string) error {
+	// Compress the report for storage
+	buf := new(bytes.Buffer)
+	gw := gzip.NewWriter(buf)
+	_, _ = gw.Write(bs) // can't fail
+	gw.Close()
+
+	// Create an output file with the compressed report
+	return os.WriteFile(fullPath, buf.Bytes(), 0644)
+}
--- a/cmd/stdisco/main.go
+++ b/cmd/stdisco/main.go
@@ -7,6 +7,7 @@
 package main

 import (
+	"context"
 	"crypto/rand"
 	"encoding/binary"
 	"flag"
@@ -47,14 +48,16 @@ func main() {
 		log.Println("My ID:", myID)
 	}

-	runbeacon(beacon.NewMulticast(mc), fake)
-	runbeacon(beacon.NewBroadcast(bc), fake)
+	ctx := context.Background()
+
+	runbeacon(ctx, beacon.NewMulticast(mc), fake)
+	runbeacon(ctx, beacon.NewBroadcast(bc), fake)

 	select {}
 }

-func runbeacon(bc beacon.Interface, fake bool) {
-	go bc.Serve()
+func runbeacon(ctx context.Context, bc beacon.Interface, fake bool) {
+	go bc.Serve(ctx)
 	go recv(bc)
 	if fake {
 		go send(bc)
--- a/cmd/stdiscosrv/apisrv.go
+++ b/cmd/stdiscosrv/apisrv.go
@@ -10,8 +10,10 @@ import (
 	"bytes"
 	"context"
 	"crypto/tls"
+	"encoding/base64"
 	"encoding/json"
 	"encoding/pem"
+	"errors"
 	"fmt"
 	"log"
 	"math/rand"
@@ -66,12 +68,12 @@ func newAPISrv(addr string, cert tls.Certificate, db database, repl replicator,
 	}
 }

-func (s *apiSrv) Serve() {
+func (s *apiSrv) Serve(_ context.Context) error {
 	if s.useHTTP {
 		listener, err := net.Listen("tcp", s.addr)
 		if err != nil {
 			log.Println("Listen:", err)
-			return
+			return err
 		}
 		s.listener = listener
 	} else {
@@ -93,7 +95,7 @@ func (s *apiSrv) Serve() {
 		tlsListener, err := tls.Listen("tcp", s.addr, tlsCfg)
 		if err != nil {
 			log.Println("Listen:", err)
-			return
+			return err
 		}
 		s.listener = tlsListener
 	}
@@ -107,9 +109,11 @@ func (s *apiSrv) Serve() {
 		MaxHeaderBytes: httpMaxHeaderBytes,
 	}

-	if err := srv.Serve(s.listener); err != nil {
+	err := srv.Serve(s.listener)
+	if err != nil {
 		log.Println("Serve:", err)
 	}
+	return err
 }

 var topCtx = context.Background()
@@ -227,10 +231,10 @@ func (s *apiSrv) handleGET(ctx context.Context, w http.ResponseWriter, req *http
 func (s *apiSrv) handlePOST(ctx context.Context, remoteAddr *net.TCPAddr, w http.ResponseWriter, req *http.Request) {
 	reqID := ctx.Value(idKey).(requestID)

-	rawCert := certificateBytes(req)
-	if rawCert == nil {
+	rawCert, err := certificateBytes(req)
+	if err != nil {
 		if debug {
-			log.Println(reqID, "no certificates")
+			log.Println(reqID, "no certificates:", err)
 		}
 		announceRequestsTotal.WithLabelValues("no_certificate").Inc()
 		w.Header().Set("Retry-After", errorRetryAfterString())
@@ -298,13 +302,13 @@ func (s *apiSrv) handleAnnounce(deviceID protocol.DeviceID, addresses []string)
 	return s.db.merge(key, dbAddrs, seen)
 }

-func handlePing(w http.ResponseWriter, r *http.Request) {
+func handlePing(w http.ResponseWriter, _ *http.Request) {
 	w.WriteHeader(204)
 }

-func certificateBytes(req *http.Request) []byte {
+func certificateBytes(req *http.Request) ([]byte, error) {
 	if req.TLS != nil && len(req.TLS.PeerCertificates) > 0 {
-		return req.TLS.PeerCertificates[0].Raw
+		return req.TLS.PeerCertificates[0].Raw, nil
 	}

 	var bs []byte
@@ -317,7 +321,7 @@ func certificateBytes(req *http.Request) []byte {
 			hdr, err := url.QueryUnescape(hdr)
 			if err != nil {
 				// Decoding failed
-				return nil
+				return nil, err
 			}

 			bs = []byte(hdr)
@@ -336,6 +340,15 @@ func certificateBytes(req *http.Request) []byte {
 				}
 			}
 		}
+	} else if hdr := req.Header.Get("X-Tls-Client-Cert-Der-Base64"); hdr != "" {
+		// Caddy {tls_client_certificate_der_base64}
+		hdr, err := base64.StdEncoding.DecodeString(hdr)
+		if err != nil {
+			// Decoding failed
+			return nil, err
+		}
+
+		bs = pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: hdr})
 	} else if hdr := req.Header.Get("X-Forwarded-Tls-Client-Cert"); hdr != "" {
 		// Traefik 2 passtlsclientcert
 		// The certificate is in PEM format with url encoding but without newlines
@@ -344,7 +357,7 @@ func certificateBytes(req *http.Request) []byte {
 		hdr, err := url.QueryUnescape(hdr)
 		if err != nil {
 			// Decoding failed
-			return nil
+			return nil, err
 		}

 		for i := 64; i < len(hdr); i += 65 {
@@ -357,16 +370,16 @@ func certificateBytes(req *http.Request) []byte {
 	}

 	if bs == nil {
-		return nil
+		return nil, errors.New("empty certificate header")
 	}

 	block, _ := pem.Decode(bs)
 	if block == nil {
 		// Decoding failed
-		return nil
+		return nil, errors.New("certificate decode result is empty")
 	}

-	return block.Bytes
+	return block.Bytes, nil
 }

 // fixupAddresses checks the list of addresses, removing invalid ones and
@@ -417,7 +430,7 @@ func fixupAddresses(remote *net.TCPAddr, addresses []string) []string {

 			// If zero port was specified, use remote port.
 			if port == "0" && remote.Port > 0 {
-				port = fmt.Sprintf("%d", remote.Port)
+				port = strconv.Itoa(remote.Port)
 			}
 		}

--- a/cmd/stdiscosrv/database.go
+++ b/cmd/stdiscosrv/database.go
@@ -4,12 +4,13 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

-//go:generate go run ../../script/protofmt.go database.proto
+//go:generate go run ../../proto/scripts/protofmt.go database.proto
 //go:generate protoc -I ../../ -I . --gogofast_out=. database.proto

 package main

 import (
+	"context"
 	"log"
 	"sort"
 	"time"
@@ -37,7 +38,6 @@ type database interface {
 type levelDBStore struct {
 	db         *leveldb.DB
 	inbox      chan func()
-	stop       chan struct{}
 	clock      clock
 	marshalBuf []byte
 }
@@ -50,7 +50,6 @@ func newLevelDBStore(dir string) (*levelDBStore, error) {
 	return &levelDBStore{
 		db:    db,
 		inbox: make(chan func(), 16),
-		stop:  make(chan struct{}),
 		clock: defaultClock{},
 	}, nil
 }
@@ -155,7 +154,7 @@ func (s *levelDBStore) get(key string) (DatabaseRecord, error) {
 	return rec, nil
 }

-func (s *levelDBStore) Serve() {
+func (s *levelDBStore) Serve(ctx context.Context) error {
 	t := time.NewTimer(0)
 	defer t.Stop()
 	defer s.db.Close()
@@ -183,7 +182,7 @@ loop:
 			// the next.
 			t.Reset(databaseStatisticsInterval)

-		case <-s.stop:
+		case <-ctx.Done():
 			// We're done.
 			close(statisticsTrigger)
 			break loop
@@ -192,6 +191,8 @@ loop:

 	// Also wait for statisticsServe to return
 	<-statisticsDone
+
+	return nil
 }

 func (s *levelDBStore) statisticsServe(trigger <-chan struct{}, done chan<- struct{}) {
@@ -255,10 +256,6 @@ func (s *levelDBStore) statisticsServe(trigger <-chan struct{}, done chan<- stru
 	}
 }

-func (s *levelDBStore) Stop() {
-	close(s.stop)
-}
-
 // merge returns the merged result of the two database records a and b. The
 // result is the union of the two address sets, with the newer expiry time
 // chosen for any duplicates.
--- a/cmd/stdiscosrv/database.pb.go
+++ b/cmd/stdiscosrv/database.pb.go
@@ -510,10 +510,7 @@ func (m *DatabaseRecord) Unmarshal(dAtA []byte) error {
 			if err != nil {
 				return err
 			}
-			if skippy < 0 {
-				return ErrInvalidLengthDatabase
-			}
-			if (iNdEx + skippy) < 0 {
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
 				return ErrInvalidLengthDatabase
 			}
 			if (iNdEx + skippy) > l {
@@ -648,10 +645,7 @@ func (m *ReplicationRecord) Unmarshal(dAtA []byte) error {
 			if err != nil {
 				return err
 			}
-			if skippy < 0 {
-				return ErrInvalidLengthDatabase
-			}
-			if (iNdEx + skippy) < 0 {
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
 				return ErrInvalidLengthDatabase
 			}
 			if (iNdEx + skippy) > l {
@@ -752,10 +746,7 @@ func (m *DatabaseAddress) Unmarshal(dAtA []byte) error {
 			if err != nil {
 				return err
 			}
-			if skippy < 0 {
-				return ErrInvalidLengthDatabase
-			}
-			if (iNdEx + skippy) < 0 {
+			if (skippy < 0) || (iNdEx+skippy) < 0 {
 				return ErrInvalidLengthDatabase
 			}
 			if (iNdEx + skippy) > l {
--- a/cmd/stdiscosrv/database_test.go
+++ b/cmd/stdiscosrv/database_test.go
@@ -7,6 +7,7 @@
 package main

 import (
+	"context"
 	"fmt"
 	"os"
 	"testing"
@@ -20,8 +21,9 @@ func TestDatabaseGetSet(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	go db.Serve()
-	defer db.Stop()
+	ctx, cancel := context.WithCancel(context.Background())
+	go db.Serve(ctx)
+	defer cancel()

 	// Check missing record

--- a/cmd/stdiscosrv/main.go
+++ b/cmd/stdiscosrv/main.go
@@ -7,6 +7,7 @@
 package main

 import (
+	"context"
 	"crypto/tls"
 	"flag"
 	"log"
@@ -21,7 +22,7 @@ import (
 	"github.com/syncthing/syncthing/lib/protocol"
 	"github.com/syncthing/syncthing/lib/tlsutil"
 	"github.com/syndtr/goleveldb/leveldb/opt"
-	"github.com/thejerf/suture"
+	"github.com/thejerf/suture/v4"
 )

 const (
@@ -115,8 +116,11 @@ func main() {
 	var replicationDestinations []string
 	parts := strings.Split(replicationPeers, ",")
 	for _, part := range parts {
-		fields := strings.Split(part, "@")
+		if part == "" {
+			continue
+		}

+		fields := strings.Split(part, "@")
 		switch len(fields) {
 		case 2:
 			// This is an id@address specification. Grab the address for the
@@ -136,6 +140,9 @@ func main() {
 			if err != nil {
 				log.Fatalln("Parsing device ID:", err)
 			}
+			if id == protocol.EmptyDeviceID {
+				log.Fatalf("Missing device ID for peer in %q", part)
+			}
 			allowedReplicationPeers = append(allowedReplicationPeers, id)

 		default:
@@ -183,5 +190,5 @@ func main() {
 	}

 	// Engage!
-	main.Serve()
+	main.Serve(context.Background())
 }
--- a/cmd/stdiscosrv/replication.go
+++ b/cmd/stdiscosrv/replication.go
@@ -7,6 +7,7 @@
 package main

 import (
+	"context"
 	"crypto/tls"
 	"encoding/binary"
 	"fmt"
@@ -32,7 +33,6 @@ type replicationSender struct {
 	cert       tls.Certificate // our certificate
 	allowedIDs []protocol.DeviceID
 	outbox     chan ReplicationRecord
-	stop       chan struct{}
 }

 func newReplicationSender(dst string, cert tls.Certificate, allowedIDs []protocol.DeviceID) *replicationSender {
@@ -41,11 +41,10 @@ func newReplicationSender(dst string, cert tls.Certificate, allowedIDs []protoco
 		cert:       cert,
 		allowedIDs: allowedIDs,
 		outbox:     make(chan ReplicationRecord, replicationOutboxSize),
-		stop:       make(chan struct{}),
 	}
 }

-func (s *replicationSender) Serve() {
+func (s *replicationSender) Serve(ctx context.Context) error {
 	// Sleep a little at startup. Peers often restart at the same time, and
 	// this avoid the service failing and entering backoff state
 	// unnecessarily, while also reducing the reconnect rate to something
@@ -62,7 +61,7 @@ func (s *replicationSender) Serve() {
 	conn, err := tls.Dial("tcp", s.dst, tlsCfg)
 	if err != nil {
 		log.Println("Replication connect:", err)
-		return
+		return err
 	}
 	defer func() {
 		conn.SetWriteDeadline(time.Now().Add(time.Second))
@@ -73,13 +72,13 @@ func (s *replicationSender) Serve() {
 	remoteID, err := deviceID(conn)
 	if err != nil {
 		log.Println("Replication connect:", err)
-		return
+		return err
 	}

 	// Verify it's in the set of allowed device IDs.
 	if !deviceIDIn(remoteID, s.allowedIDs) {
 		log.Println("Replication connect: unexpected device ID:", remoteID)
-		return
+		return err
 	}

 	heartBeatTicker := time.NewTicker(replicationHeartbeatInterval)
@@ -122,25 +121,21 @@ func (s *replicationSender) Serve() {
 				replicationSendsTotal.WithLabelValues("error").Inc()
 				log.Println("Replication write:", err)
 				// Yes, we are loosing the replication event here.
-				return
+				return err
 			}
 			replicationSendsTotal.WithLabelValues("success").Inc()

-		case <-s.stop:
-			return
+		case <-ctx.Done():
+			return nil
 		}
 	}
 }

-func (s *replicationSender) Stop() {
-	close(s.stop)
-}
-
 func (s *replicationSender) String() string {
 	return fmt.Sprintf("replicationSender(%q)", s.dst)
 }

-func (s *replicationSender) send(key string, ps []DatabaseAddress, seen int64) {
+func (s *replicationSender) send(key string, ps []DatabaseAddress, _ int64) {
 	item := ReplicationRecord{
 		Key:       key,
 		Addresses: ps,
@@ -172,7 +167,6 @@ type replicationListener struct {
 	cert       tls.Certificate
 	allowedIDs []protocol.DeviceID
 	db         database
-	stop       chan struct{}
 }

 func newReplicationListener(addr string, cert tls.Certificate, allowedIDs []protocol.DeviceID, db database) *replicationListener {
@@ -181,11 +175,10 @@ func newReplicationListener(addr string, cert tls.Certificate, allowedIDs []prot
 		cert:       cert,
 		allowedIDs: allowedIDs,
 		db:         db,
-		stop:       make(chan struct{}),
 	}
 }

-func (l *replicationListener) Serve() {
+func (l *replicationListener) Serve(ctx context.Context) error {
 	tlsCfg := &tls.Config{
 		Certificates:       []tls.Certificate{l.cert},
 		ClientAuth:         tls.RequestClientCert,
@@ -196,14 +189,14 @@ func (l *replicationListener) Serve() {
 	lst, err := tls.Listen("tcp", l.addr, tlsCfg)
 	if err != nil {
 		log.Println("Replication listen:", err)
-		return
+		return err
 	}
 	defer lst.Close()

 	for {
 		select {
-		case <-l.stop:
-			return
+		case <-ctx.Done():
+			return nil
 		default:
 		}

@@ -211,7 +204,7 @@ func (l *replicationListener) Serve() {
 		conn, err := lst.Accept()
 		if err != nil {
 			log.Println("Replication accept:", err)
-			return
+			return err
 		}

 		// Figure out the other side device ID
@@ -231,19 +224,15 @@ func (l *replicationListener) Serve() {
 			continue
 		}

-		go l.handle(conn)
+		go l.handle(ctx, conn)
 	}
 }

-func (l *replicationListener) Stop() {
-	close(l.stop)
-}
-
 func (l *replicationListener) String() string {
 	return fmt.Sprintf("replicationListener(%q)", l.addr)
 }

-func (l *replicationListener) handle(conn net.Conn) {
+func (l *replicationListener) handle(ctx context.Context, conn net.Conn) {
 	defer func() {
 		conn.SetWriteDeadline(time.Now().Add(time.Second))
 		conn.Close()
@@ -253,7 +242,7 @@ func (l *replicationListener) handle(conn net.Conn) {

 	for {
 		select {
-		case <-l.stop:
+		case <-ctx.Done():
 			return
 		default:
 		}
--- a/cmd/stdiscosrv/stats.go
+++ b/cmd/stdiscosrv/stats.go
@@ -10,6 +10,7 @@ import (
 	"os"

 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/collectors"
 )

 var (
@@ -109,7 +110,7 @@ func init() {
 		databaseKeys, databaseStatisticsSeconds,
 		databaseOperations, databaseOperationSeconds)

-	processCollectorOpts := prometheus.ProcessCollectorOpts{
+	processCollectorOpts := collectors.ProcessCollectorOpts{
 		Namespace: "syncthing_discovery",
 		PidFn: func() (int, error) {
 			return os.Getpid(), nil
@@ -117,7 +118,7 @@ func init() {
 	}

 	prometheus.MustRegister(
-		prometheus.NewProcessCollector(processCollectorOpts),
+		collectors.NewProcessCollector(processCollectorOpts),
 	)

 }
--- a/cmd/stevents/main.go
+++ b/cmd/stevents/main.go
@@ -28,16 +28,21 @@ func main() {
 	log.SetFlags(0)

 	target := flag.String("target", "localhost:8384", "Target Syncthing instance")
+	types := flag.String("types", "", "Filter for specific event types (comma-separated)")
 	apikey := flag.String("apikey", "", "Syncthing API key")
 	flag.Parse()

 	if *apikey == "" {
 		log.Fatal("Must give -apikey argument")
 	}
+	var eventsArg string
+	if len(*types) > 0 {
+		eventsArg = "&events=" + *types
+	}

 	since := 0
 	for {
-		req, err := http.NewRequest("GET", fmt.Sprintf("http://%s/rest/events?since=%d", *target, since), nil)
+		req, err := http.NewRequest("GET", fmt.Sprintf("http://%s/rest/events?since=%d%s", *target, since, eventsArg), nil)
 		if err != nil {
 			log.Fatal(err)
 		}
--- a/cmd/stfinddevice/main.go
+++ b/cmd/stfinddevice/main.go
@@ -84,7 +84,7 @@ func checkServers(deviceID protocol.DeviceID, servers ...string) {
 }

 func checkServer(deviceID protocol.DeviceID, server string) checkResult {
-	disco, err := discover.NewGlobal(server, tls.Certificate{}, nil, events.NoopLogger)
+	disco, err := discover.NewGlobal(server, tls.Certificate{}, nil, events.NoopLogger, nil)
 	if err != nil {
 		return checkResult{error: err}
 	}
--- a/cmd/stfindignored/main.go
+++ b/cmd/stfindignored/main.go
@@ -4,7 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

-// Commmand stfindignored lists ignored files under a given folder root.
+// Command stfindignored lists ignored files under a given folder root.
 package main

 import (
--- a/cmd/stindex/main.go
+++ b/cmd/stindex/main.go
@@ -1,63 +0,0 @@
-// Copyright (C) 2014 The Syncthing Authors.
-//
-// This Source Code Form is subject to the terms of the Mozilla Public
-// License, v. 2.0. If a copy of the MPL was not distributed with this file,
-// You can obtain one at https://mozilla.org/MPL/2.0/.
-
-package main
-
-import (
-	"flag"
-	"fmt"
-	"log"
-	"os"
-	"path/filepath"
-
-	"github.com/syncthing/syncthing/lib/db/backend"
-)
-
-func main() {
-	var mode string
-	log.SetFlags(0)
-	log.SetOutput(os.Stdout)
-
-	flag.StringVar(&mode, "mode", "dump", "Mode of operation: dump, dumpsize, idxck")
-
-	flag.Parse()
-
-	path := flag.Arg(0)
-	if path == "" {
-		path = filepath.Join(defaultConfigDir(), "index-v0.14.0.db")
-	}
-
-	var ldb backend.Backend
-	var err error
-	if looksLikeBadger(path) {
-		ldb, err = backend.OpenBadger(path)
-	} else {
-		ldb, err = backend.OpenLevelDBRO(path)
-	}
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	switch mode {
-	case "dump":
-		dump(ldb)
-	case "dumpsize":
-		dumpsize(ldb)
-	case "idxck":
-		if !idxck(ldb) {
-			os.Exit(1)
-		}
-	case "account":
-		account(ldb)
-	default:
-		fmt.Println("Unknown mode")
-	}
-}
-
-func looksLikeBadger(path string) bool {
-	_, err := os.Stat(filepath.Join(path, "KEYREGISTRY"))
-	return err == nil
-}
--- a/cmd/stindex/util.go
+++ b/cmd/stindex/util.go
@@ -1,52 +0,0 @@
-// Copyright (C) 2015 The Syncthing Authors.
-//
-// This Source Code Form is subject to the terms of the Mozilla Public
-// License, v. 2.0. If a copy of the MPL was not distributed with this file,
-// You can obtain one at https://mozilla.org/MPL/2.0/.
-
-package main
-
-import (
-	"log"
-	"os"
-	"path/filepath"
-	"runtime"
-
-	"github.com/syncthing/syncthing/lib/fs"
-)
-
-func nulString(bs []byte) string {
-	for i := range bs {
-		if bs[i] == 0 {
-			return string(bs[:i])
-		}
-	}
-	return string(bs)
-}
-
-func defaultConfigDir() string {
-	switch runtime.GOOS {
-	case "windows":
-		if p := os.Getenv("LocalAppData"); p != "" {
-			return filepath.Join(p, "Syncthing")
-		}
-		return filepath.Join(os.Getenv("AppData"), "Syncthing")
-
-	case "darwin":
-		dir, err := fs.ExpandTilde("~/Library/Application Support/Syncthing")
-		if err != nil {
-			log.Fatal(err)
-		}
-		return dir
-
-	default:
-		if xdgCfg := os.Getenv("XDG_CONFIG_HOME"); xdgCfg != "" {
-			return filepath.Join(xdgCfg, "syncthing")
-		}
-		dir, err := fs.ExpandTilde("~/.config/syncthing")
-		if err != nil {
-			log.Fatal(err)
-		}
-		return dir
-	}
-}
--- a/cmd/strelaypoolsrv/auto/noassets.go
+++ b/cmd/strelaypoolsrv/auto/noassets.go
@@ -0,0 +1,16 @@
+// Copyright (C) 2021 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+//go:build noassets
+// +build noassets
+
+package auto
+
+import "github.com/syncthing/syncthing/lib/assets"
+
+func Assets() map[string]assets.Asset {
+	return nil
+}
--- a/cmd/strelaypoolsrv/gui/index.html
+++ b/cmd/strelaypoolsrv/gui/index.html
@@ -46,18 +46,18 @@
      <h1>Relay Pool Data</h1>
      <div ng-if="relays === undefined" class="text-center">
        <img src="https://cdnjs.cloudflare.com/ajax/libs/galleriffic/2.0.1/css/loader.gif" alt=""/>
-        <p>Please wait while we gather data</p>
+        <p>Please wait while we gather data…</p>
      </div>
      <div>
        <div ng-show="relays !== undefined" class="ng-hide">
          <p>
            The relays listed on this page are not managed or vetted by the Syncthing project.
            Each relay is the responsibility of the relay operator.
-            Currently {{ relays.length }} relays online.
+            Currently {{ relays.length }} relays are online.
          </p>
        </div>
        <div id="map"></div> <!-- Can't hide the map, otherwise it freaks out -->
-        <p>The circle size represents how much bytes the relay transferred relative to other relays</p>
+        <p>The circle size represents how much bytes the relay has transferred relatively to other relays.</p>
      </div>
      <div>
        <table class="table table-striped table-condensed table">
@@ -188,7 +188,7 @@
      <hr>
      <p>
        This product includes GeoLite2 data created by MaxMind, available from
-        <a href="http://www.maxmind.com">http://www.maxmind.com</a>.
+        <a href="https://www.maxmind.com">https://www.maxmind.com</a>.
      </p>
    </div>

@@ -237,7 +237,7 @@
      uptimeSeconds: 0,
    };
    $scope.map = L.map('map').setView([40.90296, 1.90925], 2);
-    L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
+    L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
    {
      attribution: 'Leaflet',
      maxZoom: 17
--- a/cmd/strelaypoolsrv/main.go
+++ b/cmd/strelaypoolsrv/main.go
@@ -6,11 +6,11 @@ import (
 	"compress/gzip"
 	"context"
 	"crypto/tls"
+	"crypto/x509"
 	"encoding/json"
 	"flag"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"net"
 	"net/http"
@@ -21,6 +21,8 @@ import (
 	"strings"
 	"time"

+	"github.com/syncthing/syncthing/lib/protocol"
+
 	"github.com/golang/groupcache/lru"
 	"github.com/oschwald/geoip2-golang"
 	"github.com/prometheus/client_golang/prometheus"
@@ -208,6 +210,7 @@ func main() {
 		tlsCfg := &tls.Config{
 			Certificates: []tls.Certificate{cert},
 			MinVersion:   tls.VersionTLS10, // No SSLv3
+			ClientAuth:   tls.RequestClientCert,
 			CipherSuites: []uint16{
 				// No RC4
 				tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
@@ -314,8 +317,11 @@ func handleRequest(w http.ResponseWriter, r *http.Request) {

 func handleGetRequest(rw http.ResponseWriter, r *http.Request) {
 	rw.Header().Set("Content-Type", "application/json; charset=utf-8")
+
 	mut.RLock()
-	relays := append(permanentRelays, knownRelays...)
+	relays := make([]*relay, len(permanentRelays)+len(knownRelays))
+	n := copy(relays, permanentRelays)
+	copy(relays[n:], knownRelays)
 	mut.RUnlock()

 	// Shuffle
@@ -335,6 +341,12 @@ func handleGetRequest(rw http.ResponseWriter, r *http.Request) {
 }

 func handlePostRequest(w http.ResponseWriter, r *http.Request) {
+	var relayCert *x509.Certificate
+	if r.TLS != nil && len(r.TLS.PeerCertificates) > 0 {
+		relayCert = r.TLS.PeerCertificates[0]
+		log.Printf("Got TLS cert from relay server")
+	}
+
 	var newRelay relay
 	err := json.NewDecoder(r.Body).Decode(&newRelay)
 	r.Body.Close()
@@ -356,6 +368,21 @@ func handlePostRequest(w http.ResponseWriter, r *http.Request) {
 		return
 	}

+	// Canonicalize the URL. In particular, parse and re-encode the query
+	// string so that it's guaranteed to be valid.
+	uri.RawQuery = uri.Query().Encode()
+	newRelay.URL = uri.String()
+
+	if relayCert != nil {
+		advertisedId := uri.Query().Get("id")
+		idFromCert := protocol.NewDeviceID(relayCert.Raw).String()
+		if advertisedId != idFromCert {
+			log.Println("Warning: Relay server requested to join with an ID different from the join request, rejecting")
+			http.Error(w, "mismatched advertised id and join request cert", http.StatusBadRequest)
+			return
+		}
+	}
+
 	host, port, err := net.SplitHostPort(uri.Host)
 	if err != nil {
 		if debug {
@@ -376,7 +403,7 @@ func handlePostRequest(w http.ResponseWriter, r *http.Request) {
 	if ip == nil || ip.IsUnspecified() {
 		uri.Host = net.JoinHostPort(rhost, port)
 		newRelay.URL = uri.String()
-	} else if host != rhost {
+	} else if host != rhost && relayCert == nil {
 		if debug {
 			log.Println("IP address advertised does not match client IP address", r.RemoteAddr, uri)
 		}
@@ -453,7 +480,7 @@ func handleRelayTest(request request) {
 		updateMetrics(request.relay.uri.Host, *stats, location)
 	}
 	request.relay.Stats = stats
-	request.relay.StatsRetrieved = time.Now()
+	request.relay.StatsRetrieved = time.Now().Truncate(time.Second)
 	request.relay.Location = location

 	timer, ok := evictionTimers[request.relay.uri.Host]
@@ -537,7 +564,7 @@ func limit(addr string, cache *lru.Cache, lock sync.Mutex, intv time.Duration, b
 }

 func loadRelays(file string) []*relay {
-	content, err := ioutil.ReadFile(file)
+	content, err := os.ReadFile(file)
 	if err != nil {
 		log.Println("Failed to load relays: " + err.Error())
 		return nil
@@ -545,7 +572,7 @@ func loadRelays(file string) []*relay {

 	var relays []*relay
 	for _, line := range strings.Split(string(content), "\n") {
-		if len(line) == 0 {
+		if line == "" {
 			continue
 		}

@@ -575,11 +602,11 @@ func saveRelays(file string, relays []*relay) error {
 	for _, relay := range relays {
 		content += relay.uri.String() + "\n"
 	}
-	return ioutil.WriteFile(file, []byte(content), 0777)
+	return os.WriteFile(file, []byte(content), 0777)
 }

 func createTestCertificate() tls.Certificate {
-	tmpDir, err := ioutil.TempDir("", "relaypoolsrv")
+	tmpDir, err := os.MkdirTemp("", "relaypoolsrv")
 	if err != nil {
 		log.Fatal(err)
 	}
--- a/cmd/strelaypoolsrv/main_test.go
+++ b/cmd/strelaypoolsrv/main_test.go
@@ -0,0 +1,94 @@
+// Copyright © 2020 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http/httptest"
+	"net/url"
+	"strings"
+	"sync"
+	"testing"
+)
+
+func init() {
+	for i := 0; i < 10; i++ {
+		u := fmt.Sprintf("permanent%d", i)
+		permanentRelays = append(permanentRelays, &relay{URL: u})
+	}
+
+	knownRelays = []*relay{
+		{URL: "known1"},
+		{URL: "known2"},
+		{URL: "known3"},
+	}
+
+	mut = new(sync.RWMutex)
+}
+
+// Regression test: handleGetRequest should not modify permanentRelays.
+func TestHandleGetRequest(t *testing.T) {
+	needcap := len(permanentRelays) + len(knownRelays)
+	if needcap > cap(permanentRelays) {
+		t.Fatalf("test setup failed: need cap(permanentRelays) >= %d, have %d",
+			needcap, cap(permanentRelays))
+	}
+
+	w := httptest.NewRecorder()
+	w.Body = new(bytes.Buffer)
+	handleGetRequest(w, httptest.NewRequest("GET", "/", nil))
+
+	result := make(map[string][]*relay)
+	err := json.NewDecoder(w.Body).Decode(&result)
+	if err != nil {
+		t.Fatalf("invalid JSON: %v", err)
+	}
+
+	relays := result["relays"]
+	expect, actual := len(knownRelays)+len(permanentRelays), len(relays)
+	if actual != expect {
+		t.Errorf("expected %d relays, got %d", expect, actual)
+	}
+
+	// Check for changes in permanentRelays.
+	for i, r := range permanentRelays {
+		switch {
+		case !strings.HasPrefix(r.URL, "permanent"):
+			t.Errorf("relay %q among permanent relays", r.URL)
+		case r.URL != fmt.Sprintf("permanent%d", i):
+			t.Error("order of permanent relays changed")
+		}
+	}
+}
+
+func TestCanonicalizeQueryValues(t *testing.T) {
+	// This just demonstrates and validates the uri.Parse/String stuff in
+	// regards to query strings.
+
+	in := "http://example.com/?some weird= query^value"
+	exp := "http://example.com/?some+weird=+query%5Evalue"
+
+	uri, err := url.Parse(in)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	str := uri.String()
+	if str != in {
+		// Just re-encoding the URL doesn't sanitize the query string.
+		t.Errorf("expected %q, got %q", in, str)
+	}
+
+	uri.RawQuery = uri.Query().Encode()
+	str = uri.String()
+	if str != exp {
+		// The query string is now in correct format.
+		t.Errorf("expected %q, got %q", exp, str)
+	}
+}
--- a/cmd/strelaypoolsrv/stats.go
+++ b/cmd/strelaypoolsrv/stats.go
@@ -10,11 +10,12 @@ import (
 	"time"

 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/collectors"
 	"github.com/syncthing/syncthing/lib/sync"
 )

 func init() {
-	processCollectorOpts := prometheus.ProcessCollectorOpts{
+	processCollectorOpts := collectors.ProcessCollectorOpts{
 		Namespace: "syncthing_relaypoolsrv",
 		PidFn: func() (int, error) {
 			return os.Getpid(), nil
@@ -22,7 +23,7 @@ func init() {
 	}

 	prometheus.MustRegister(
-		prometheus.NewProcessCollector(processCollectorOpts),
+		collectors.NewProcessCollector(processCollectorOpts),
 	)
 }

--- a/cmd/strelaysrv/listener.go
+++ b/cmd/strelaysrv/listener.go
@@ -23,7 +23,7 @@ var (
 	numConnections int64
 )

-func listener(proto, addr string, config *tls.Config) {
+func listener(_, addr string, config *tls.Config) {
 	tcpListener, err := net.Listen("tcp", addr)
 	if err != nil {
 		log.Fatalln(err)
@@ -76,7 +76,7 @@ func protocolConnectionHandler(tcpConn net.Conn, config *tls.Config) {
 	}

 	state := conn.ConnectionState()
-	if (!state.NegotiatedProtocolIsMutual || state.NegotiatedProtocol != protocol.ProtocolName) && debug {
+	if debug && state.NegotiatedProtocol != protocol.ProtocolName {
 		log.Println("Protocol negotiation error")
 	}

--- a/cmd/strelaysrv/main.go
+++ b/cmd/strelaysrv/main.go
@@ -3,6 +3,7 @@
 package main

 import (
+	"context"
 	"crypto/tls"
 	"flag"
 	"fmt"
@@ -13,7 +14,6 @@ import (
 	"os"
 	"os/signal"
 	"path/filepath"
-	"runtime"
 	"strings"
 	"sync/atomic"
 	"syscall"
@@ -98,7 +98,7 @@ func main() {
 	flag.IntVar(&natRenewal, "nat-renewal", 30, "NAT renewal frequency in minutes")
 	flag.IntVar(&natTimeout, "nat-timeout", 10, "NAT discovery timeout in seconds")
 	flag.BoolVar(&pprofEnabled, "pprof", false, "Enable the built in profiling on the status server")
-	flag.IntVar(&networkBufferSize, "network-buffer", 2048, "Network buffer size (two of these per proxied connection)")
+	flag.IntVar(&networkBufferSize, "network-buffer", 65536, "Network buffer size (two of these per proxied connection)")
 	showVersion := flag.Bool("version", false, "Show version")
 	flag.Parse()

@@ -145,7 +145,7 @@ func main() {
 		log.Println("Connection limit", descriptorLimit)

 		go monitorLimits()
-	} else if err != nil && runtime.GOOS != "windows" {
+	} else if err != nil && !build.IsWindows {
 		log.Println("Assuming no connection limit, due to error retrieving rlimits:", err)
 	}

@@ -184,19 +184,22 @@ func main() {
 		log.Println("ID:", id)
 	}

-	wrapper := config.Wrap("config", config.New(id), events.NoopLogger)
-	wrapper.SetOptions(config.OptionsConfiguration{
-		NATLeaseM:   natLease,
-		NATRenewalM: natRenewal,
-		NATTimeoutS: natTimeout,
+	wrapper := config.Wrap("config", config.New(id), id, events.NoopLogger)
+	go wrapper.Serve(context.TODO())
+	wrapper.Modify(func(cfg *config.Configuration) {
+		cfg.Options.NATLeaseM = natLease
+		cfg.Options.NATRenewalM = natRenewal
+		cfg.Options.NATTimeoutS = natTimeout
 	})
 	natSvc := nat.NewService(id, wrapper)
 	mapping := mapping{natSvc.NewMapping(nat.TCP, addr.IP, addr.Port)}

 	if natEnabled {
-		go natSvc.Serve()
+		ctx, cancel := context.WithCancel(context.Background())
+		go natSvc.Serve(ctx)
+		defer cancel()
 		found := make(chan struct{})
-		mapping.OnChanged(func(_ *nat.Mapping, _, _ []nat.Address) {
+		mapping.OnChanged(func() {
 			select {
 			case found <- struct{}{}:
 			default:
@@ -226,11 +229,31 @@ func main() {
 		go statusService(statusAddr)
 	}

-	uri, err := url.Parse(fmt.Sprintf("relay://%s/?id=%s&pingInterval=%s&networkTimeout=%s&sessionLimitBps=%d&globalLimitBps=%d&statusAddr=%s&providedBy=%s", mapping.Address(), id, pingInterval, networkTimeout, sessionLimitBps, globalLimitBps, statusAddr, providedBy))
+	uri, err := url.Parse(fmt.Sprintf("relay://%s/", mapping.Address()))
 	if err != nil {
 		log.Fatalln("Failed to construct URI", err)
+		return
 	}

+	// Add properly encoded query string parameters to URL.
+	query := make(url.Values)
+	query.Set("id", id.String())
+	query.Set("pingInterval", pingInterval.String())
+	query.Set("networkTimeout", networkTimeout.String())
+	if sessionLimitBps > 0 {
+		query.Set("sessionLimitBps", fmt.Sprint(sessionLimitBps))
+	}
+	if globalLimitBps > 0 {
+		query.Set("globalLimitBps", fmt.Sprint(globalLimitBps))
+	}
+	if statusAddr != "" {
+		query.Set("statusAddr", statusAddr)
+	}
+	if providedBy != "" {
+		query.Set("providedBy", providedBy)
+	}
+	uri.RawQuery = query.Encode()
+
 	log.Println("URI:", uri.String())

 	if poolAddrs == defaultPoolAddrs {
@@ -244,7 +267,7 @@ func main() {
 	for _, pool := range pools {
 		pool = strings.TrimSpace(pool)
 		if len(pool) > 0 {
-			go poolHandler(pool, uri, mapping)
+			go poolHandler(pool, uri, mapping, cert)
 		}
 	}

--- a/cmd/strelaysrv/pool.go
+++ b/cmd/strelaysrv/pool.go
@@ -4,8 +4,9 @@ package main

 import (
 	"bytes"
+	"crypto/tls"
 	"encoding/json"
-	"io/ioutil"
+	"io"
 	"log"
 	"net/http"
 	"net/url"
@@ -16,7 +17,7 @@ const (
 	httpStatusEnhanceYourCalm = 429
 )

-func poolHandler(pool string, uri *url.URL, mapping mapping) {
+func poolHandler(pool string, uri *url.URL, mapping mapping, ownCert tls.Certificate) {
 	if debug {
 		log.Println("Joining", pool)
 	}
@@ -31,14 +32,31 @@ func poolHandler(pool string, uri *url.URL, mapping mapping) {
 			uriCopy.String(),
 		})

-		resp, err := httpClient.Post(pool, "application/json", &b)
+		poolUrl, err := url.Parse(pool)
+		if err != nil {
+			log.Printf("Could not parse pool url '%s': %v", pool, err)
+		}
+
+		client := http.DefaultClient
+		if poolUrl.Scheme == "https" {
+			// Sent our certificate in join request
+			client = &http.Client{
+				Transport: &http.Transport{
+					TLSClientConfig: &tls.Config{
+						Certificates: []tls.Certificate{ownCert},
+					},
+				},
+			}
+		}
+
+		resp, err := client.Post(pool, "application/json", &b)
 		if err != nil {
 			log.Printf("Error joining pool %v: HTTP request: %v", pool, err)
 			time.Sleep(time.Minute)
 			continue
 		}

-		bs, err := ioutil.ReadAll(resp.Body)
+		bs, err := io.ReadAll(resp.Body)
 		resp.Body.Close()
 		if err != nil {
 			log.Printf("Error joining pool %v: reading response: %v", pool, err)
@@ -56,9 +74,8 @@ func poolHandler(pool string, uri *url.URL, mapping mapping) {
 				log.Printf("Joined pool %s, rejoining in %v", pool, rejoin)
 				time.Sleep(rejoin)
 				continue
-			} else {
-				log.Printf("Joined pool %s, failed to deserialize response: %v", pool, err)
 			}
+			log.Printf("Joined pool %s, failed to deserialize response: %v", pool, err)

 		case http.StatusInternalServerError:
 			log.Printf("Failed to join %v: server error", pool)
--- a/cmd/strelaysrv/status.go
+++ b/cmd/strelaysrv/status.go
@@ -36,7 +36,7 @@ func statusService(addr string) {
 	}
 }

-func getStatus(w http.ResponseWriter, r *http.Request) {
+func getStatus(w http.ResponseWriter, _ *http.Request) {
 	w.Header().Set("Access-Control-Allow-Origin", "*")
 	status := make(map[string]interface{})

--- a/cmd/strelaysrv/testutil/main.go
+++ b/cmd/strelaysrv/testutil/main.go
@@ -20,7 +20,8 @@ import (
 )

 func main() {
-	ctx := context.Background()
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()

 	log.SetOutput(os.Stdout)
 	log.SetFlags(log.LstdFlags | log.Lshortfile)
@@ -56,13 +57,13 @@ func main() {

 	if join {
 		log.Println("Creating client")
-		relay, err := client.NewClient(uri, []tls.Certificate{cert}, nil, 10*time.Second)
+		relay, err := client.NewClient(uri, []tls.Certificate{cert}, 10*time.Second)
 		if err != nil {
 			log.Fatal(err)
 		}
 		log.Println("Created client")

-		go relay.Serve()
+		go relay.Serve(ctx)

 		recv := make(chan protocol.SessionInvitation)

@@ -126,10 +127,6 @@ func stdinReader(c chan<- string) {
 }

 func connectToStdio(stdin <-chan string, conn net.Conn) {
-	go func() {
-
-	}()
-
 	buf := make([]byte, 1024)
 	for {
 		conn.SetReadDeadline(time.Now().Add(time.Millisecond))
--- a/cmd/stsigtool/main.go
+++ b/cmd/stsigtool/main.go
@@ -9,7 +9,6 @@ package main
 import (
 	"flag"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"

@@ -69,7 +68,7 @@ func gen() {
 }

 func sign(keyname, dataname string) {
-	privkey, err := ioutil.ReadFile(keyname)
+	privkey, err := os.ReadFile(keyname)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -95,7 +94,7 @@ func sign(keyname, dataname string) {
 }

 func verifyWithFile(signame, dataname, keyname string) {
-	pubkey, err := ioutil.ReadFile(keyname)
+	pubkey, err := os.ReadFile(keyname)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -103,7 +102,7 @@ func verifyWithFile(signame, dataname, keyname string) {
 }

 func verifyWithKey(signame, dataname string, pubkey []byte) {
-	sig, err := ioutil.ReadFile(signame)
+	sig, err := os.ReadFile(signame)
 	if err != nil {
 		log.Fatal(err)
 	}
--- a/cmd/stvanity/main.go
+++ b/cmd/stvanity/main.go
@@ -37,7 +37,7 @@ type result struct {

 func main() {
 	flag.Parse()
-	prefix := strings.ToUpper(strings.Replace(flag.Arg(0), "-", "", -1))
+	prefix := strings.ToUpper(strings.ReplaceAll(flag.Arg(0), "-", ""))
 	if len(prefix) > 7 {
 		prefix = prefix[:7] + "-" + prefix[7:]
 	}
--- a/cmd/stwatchfile/main.go
+++ b/cmd/stwatchfile/main.go
@@ -7,31 +7,15 @@
 package main

 import (
-	"bytes"
-	"crypto/md5"
 	"flag"
 	"fmt"
 	"io"
 	"os"
 	"time"
+
+	"github.com/syncthing/syncthing/lib/sha256"
 )

-func getmd5(filePath string) ([]byte, error) {
-	var result []byte
-	file, err := os.Open(filePath)
-	if err != nil {
-		return result, err
-	}
-	defer file.Close()
-
-	hash := md5.New()
-	if _, err := io.Copy(hash, file); err != nil {
-		return result, err
-	}
-
-	return hash.Sum(result), nil
-}
-
 func main() {
 	period := flag.Duration("period", 200*time.Millisecond, "Sleep period between checks")
 	flag.Parse()
@@ -46,7 +30,7 @@ func main() {
 	exists := true
 	size := int64(0)
 	mtime := time.Time{}
-	hash := []byte{}
+	var hash [sha256.Size]byte

 	for {
 		time.Sleep(*period)
@@ -72,7 +56,7 @@ func main() {
 		if !exists {
 			size = 0
 			mtime = time.Time{}
-			hash = []byte{}
+			hash = [sha256.Size]byte{}
 			continue
 		}

@@ -83,12 +67,12 @@ func main() {
 		newSize := fi.Size()
 		newMtime := fi.ModTime()

-		newHash, err := getmd5(file)
+		newHash, err := sha256file(file)
 		if err != nil {
-			fmt.Println("getmd5:", err)
+			fmt.Println("sha256file:", err)
 		}

-		if newSize != size || newMtime != mtime || !bytes.Equal(newHash, hash) {
+		if newSize != size || newMtime != mtime || newHash != hash {
 			fmt.Println(file, "Size:", newSize, "Mtime:", newMtime, "Hash:", fmt.Sprintf("%x", newHash))
 			hash = newHash
 			size = newSize
@@ -96,3 +80,18 @@ func main() {
 		}
 	}
 }
+
+func sha256file(fname string) (hash [sha256.Size]byte, err error) {
+	f, err := os.Open(fname)
+	if err != nil {
+		return
+	}
+	defer f.Close()
+
+	h := sha256.New()
+	io.Copy(h, f)
+	hb := h.Sum(nil)
+	copy(hash[:], hb)
+
+	return
+}
--- a/cmd/syncthing/blockprof.go
+++ b/cmd/syncthing/blockprof.go
@@ -15,19 +15,17 @@ import (
 	"time"
 )

-func init() {
-	if innerProcess && os.Getenv("STBLOCKPROFILE") != "" {
-		profiler := pprof.Lookup("block")
-		if profiler == nil {
-			panic("Couldn't find block profiler")
-		}
-		l.Debugln("Starting block profiling")
-		go func() {
-			err := saveBlockingProfiles(profiler) // Only returns on error
-			l.Warnln("Block profiler failed:", err)
-			panic("Block profiler failed")
-		}()
+func startBlockProfiler() {
+	profiler := pprof.Lookup("block")
+	if profiler == nil {
+		panic("Couldn't find block profiler")
 	}
+	l.Debugln("Starting block profiling")
+	go func() {
+		err := saveBlockingProfiles(profiler) // Only returns on error
+		l.Warnln("Block profiler failed:", err)
+		panic("Block profiler failed")
+	}()
 }

 func saveBlockingProfiles(profiler *pprof.Profile) error {
--- a/cmd/syncthing/cli/client.go
+++ b/cmd/syncthing/cli/client.go
@@ -0,0 +1,172 @@
+// Copyright (C) 2019 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package cli
+
+import (
+	"bytes"
+	"context"
+	"crypto/tls"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"strings"
+
+	"github.com/syncthing/syncthing/lib/config"
+	"github.com/syncthing/syncthing/lib/events"
+	"github.com/syncthing/syncthing/lib/locations"
+	"github.com/syncthing/syncthing/lib/protocol"
+)
+
+type APIClient interface {
+	Get(url string) (*http.Response, error)
+	Post(url, body string) (*http.Response, error)
+	PutJSON(url string, o interface{}) (*http.Response, error)
+}
+
+type apiClient struct {
+	http.Client
+	cfg    config.GUIConfiguration
+	apikey string
+}
+
+type apiClientFactory struct {
+	cfg config.GUIConfiguration
+}
+
+func (f *apiClientFactory) getClient() (APIClient, error) {
+	// Now if the API key and address is not provided (we are not connecting to a remote instance),
+	// try to rip it out of the config.
+	if f.cfg.RawAddress == "" && f.cfg.APIKey == "" {
+		var err error
+		f.cfg, err = loadGUIConfig()
+		if err != nil {
+			return nil, err
+		}
+	} else if f.cfg.Address() == "" || f.cfg.APIKey == "" {
+		return nil, errors.New("Both --gui-address and --gui-apikey should be specified")
+	}
+
+	httpClient := http.Client{
+		Transport: &http.Transport{
+			TLSClientConfig: &tls.Config{
+				InsecureSkipVerify: true,
+			},
+			DialContext: func(_ context.Context, _, _ string) (net.Conn, error) {
+				return net.Dial(f.cfg.Network(), f.cfg.Address())
+			},
+		},
+	}
+	return &apiClient{
+		Client: httpClient,
+		cfg:    f.cfg,
+		apikey: f.cfg.APIKey,
+	}, nil
+}
+
+func loadGUIConfig() (config.GUIConfiguration, error) {
+	// Load the certs and get the ID
+	cert, err := tls.LoadX509KeyPair(
+		locations.Get(locations.CertFile),
+		locations.Get(locations.KeyFile),
+	)
+	if err != nil {
+		return config.GUIConfiguration{}, fmt.Errorf("reading device ID: %w", err)
+	}
+
+	myID := protocol.NewDeviceID(cert.Certificate[0])
+
+	// Load the config
+	cfg, _, err := config.Load(locations.Get(locations.ConfigFile), myID, events.NoopLogger)
+	if err != nil {
+		return config.GUIConfiguration{}, fmt.Errorf("loading config: %w", err)
+	}
+
+	guiCfg := cfg.GUI()
+
+	if guiCfg.Address() == "" {
+		return config.GUIConfiguration{}, errors.New("Could not find GUI Address")
+	}
+
+	if guiCfg.APIKey == "" {
+		return config.GUIConfiguration{}, errors.New("Could not find GUI API key")
+	}
+
+	return guiCfg, nil
+}
+
+func (c *apiClient) Endpoint() string {
+	if c.cfg.Network() == "unix" {
+		return "http://unix/"
+	}
+	url := c.cfg.URL()
+	if !strings.HasSuffix(url, "/") {
+		url += "/"
+	}
+	return url
+}
+
+func (c *apiClient) Do(req *http.Request) (*http.Response, error) {
+	req.Header.Set("X-API-Key", c.apikey)
+	resp, err := c.Client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	return resp, checkResponse(resp)
+}
+
+func (c *apiClient) Request(url, method string, r io.Reader) (*http.Response, error) {
+	request, err := http.NewRequest(method, c.Endpoint()+"rest/"+url, r)
+	if err != nil {
+		return nil, err
+	}
+	return c.Do(request)
+}
+
+func (c *apiClient) RequestString(url, method, data string) (*http.Response, error) {
+	return c.Request(url, method, bytes.NewBufferString(data))
+}
+
+func (c *apiClient) RequestJSON(url, method string, o interface{}) (*http.Response, error) {
+	data, err := json.Marshal(o)
+	if err != nil {
+		return nil, err
+	}
+	return c.Request(url, method, bytes.NewBuffer(data))
+}
+
+func (c *apiClient) Get(url string) (*http.Response, error) {
+	return c.RequestString(url, "GET", "")
+}
+
+func (c *apiClient) Post(url, body string) (*http.Response, error) {
+	return c.RequestString(url, "POST", body)
+}
+
+func (c *apiClient) PutJSON(url string, o interface{}) (*http.Response, error) {
+	return c.RequestJSON(url, "PUT", o)
+}
+
+var errNotFound = errors.New("invalid endpoint or API call")
+
+func checkResponse(response *http.Response) error {
+	if response.StatusCode == http.StatusNotFound {
+		return errNotFound
+	} else if response.StatusCode == http.StatusUnauthorized {
+		return errors.New("invalid API key")
+	} else if response.StatusCode != http.StatusOK {
+		data, err := responseToBArray(response)
+		if err != nil {
+			return err
+		}
+		body := strings.TrimSpace(string(data))
+		return fmt.Errorf("unexpected HTTP status returned: %s\n%s", response.Status, body)
+	}
+	return nil
+}
--- a/cmd/syncthing/cli/config.go
+++ b/cmd/syncthing/cli/config.go
@@ -0,0 +1,87 @@
+// Copyright (C) 2021 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package cli
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"reflect"
+
+	"github.com/AudriusButkevicius/recli"
+	"github.com/syncthing/syncthing/lib/config"
+	"github.com/urfave/cli"
+)
+
+type configHandler struct {
+	original, cfg config.Configuration
+	client        APIClient
+	err           error
+}
+
+func getConfigCommand(f *apiClientFactory) (cli.Command, error) {
+	h := new(configHandler)
+	h.client, h.err = f.getClient()
+	if h.err == nil {
+		h.cfg, h.err = getConfig(h.client)
+	}
+	h.original = h.cfg.Copy()
+
+	// Copy the config and set the default flags
+	recliCfg := recli.DefaultConfig
+	recliCfg.IDTag.Name = "xml"
+	recliCfg.SkipTag.Name = "json"
+
+	commands, err := recli.New(recliCfg).Construct(&h.cfg)
+	if err != nil {
+		return cli.Command{}, fmt.Errorf("config reflect: %w", err)
+	}
+
+	return cli.Command{
+		Name:        "config",
+		HideHelp:    true,
+		Usage:       "Configuration modification command group",
+		Subcommands: commands,
+		Before:      h.configBefore,
+		After:       h.configAfter,
+	}, nil
+}
+
+func (h *configHandler) configBefore(c *cli.Context) error {
+	for _, arg := range c.Args() {
+		if arg == "--help" || arg == "-h" {
+			return nil
+		}
+	}
+	return h.err
+}
+
+func (h *configHandler) configAfter(_ *cli.Context) error {
+	if h.err != nil {
+		// Error was already returned in configBefore
+		return nil
+	}
+	if reflect.DeepEqual(h.cfg, h.original) {
+		return nil
+	}
+	body, err := json.MarshalIndent(h.cfg, "", "  ")
+	if err != nil {
+		return err
+	}
+	resp, err := h.client.Post("system/config", string(body))
+	if err != nil {
+		return err
+	}
+	if resp.StatusCode != 200 {
+		body, err := responseToBArray(resp)
+		if err != nil {
+			return err
+		}
+		return errors.New(string(body))
+	}
+	return nil
+}
--- a/cmd/syncthing/cli/debug.go
+++ b/cmd/syncthing/cli/debug.go
@@ -0,0 +1,55 @@
+// Copyright (C) 2021 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package cli
+
+import (
+	"fmt"
+	"net/url"
+
+	"github.com/urfave/cli"
+)
+
+var debugCommand = cli.Command{
+	Name:     "debug",
+	HideHelp: true,
+	Usage:    "Debug command group",
+	Subcommands: []cli.Command{
+		{
+			Name:      "file",
+			Usage:     "Show information about a file (or directory/symlink)",
+			ArgsUsage: "FOLDER-ID PATH",
+			Action:    expects(2, debugFile()),
+		},
+		indexCommand,
+		{
+			Name:      "profile",
+			Usage:     "Save a profile to help figuring out what Syncthing does.",
+			ArgsUsage: "cpu | heap",
+			Action:    expects(1, profile()),
+		},
+	},
+}
+
+func debugFile() cli.ActionFunc {
+	return func(c *cli.Context) error {
+		query := make(url.Values)
+		query.Set("folder", c.Args()[0])
+		query.Set("file", normalizePath(c.Args()[1]))
+		return indexDumpOutput("debug/file?" + query.Encode())(c)
+	}
+}
+
+func profile() cli.ActionFunc {
+	return func(c *cli.Context) error {
+		switch t := c.Args()[0]; t {
+		case "cpu", "heap":
+			return saveToFile(fmt.Sprintf("debug/%vprof", c.Args()[0]))(c)
+		default:
+			return fmt.Errorf("expected cpu or heap as argument, got %v", t)
+		}
+	}
+}
--- a/cmd/syncthing/cli/errors.go
+++ b/cmd/syncthing/cli/errors.go
@@ -4,7 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

-package main
+package cli

 import (
 	"errors"
@@ -22,12 +22,12 @@ var errorsCommand = cli.Command{
 		{
 			Name:   "show",
 			Usage:  "Show pending errors",
-			Action: expects(0, dumpOutput("system/error")),
+			Action: expects(0, indexDumpOutput("system/error")),
 		},
 		{
 			Name:      "push",
 			Usage:     "Push an error to active clients",
-			ArgsUsage: "[error message]",
+			ArgsUsage: "ERROR-MESSAGE",
 			Action:    expects(1, errorsPush),
 		},
 		{
@@ -39,7 +39,7 @@ var errorsCommand = cli.Command{
 }

 func errorsPush(c *cli.Context) error {
-	client := c.App.Metadata["client"].(*APIClient)
+	client := c.App.Metadata["client"].(APIClient)
 	errStr := strings.Join(c.Args(), " ")
 	response, err := client.Post("system/error", strings.TrimSpace(errStr))
 	if err != nil {
--- a/cmd/syncthing/cli/index.go
+++ b/cmd/syncthing/cli/index.go
@@ -0,0 +1,38 @@
+// Copyright (C) 2014 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package cli
+
+import (
+	"github.com/urfave/cli"
+)
+
+var indexCommand = cli.Command{
+	Name:  "index",
+	Usage: "Show information about the index (database)",
+	Subcommands: []cli.Command{
+		{
+			Name:   "dump",
+			Usage:  "Print the entire db",
+			Action: expects(0, indexDump),
+		},
+		{
+			Name:   "dump-size",
+			Usage:  "Print the db size of different categories of information",
+			Action: expects(0, indexDumpSize),
+		},
+		{
+			Name:   "check",
+			Usage:  "Check the database for inconsistencies",
+			Action: expects(0, indexCheck),
+		},
+		{
+			Name:   "account",
+			Usage:  "Print key and value size statistics per key type",
+			Action: expects(0, indexAccount),
+		},
+	},
+}
--- a/cmd/syncthing/cli/index_accounting.go
+++ b/cmd/syncthing/cli/index_accounting.go
@@ -4,22 +4,26 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

-package main
+package cli

 import (
 	"fmt"
-	"log"
 	"os"
 	"text/tabwriter"

-	"github.com/syncthing/syncthing/lib/db/backend"
+	"github.com/urfave/cli"
 )

-// account prints key and data size statistics per class
-func account(ldb backend.Backend) {
+// indexAccount prints key and data size statistics per class
+func indexAccount(*cli.Context) error {
+	ldb, err := getDB()
+	if err != nil {
+		return err
+	}
+
 	it, err := ldb.NewPrefixIterator(nil)
 	if err != nil {
-		log.Fatal(err)
+		return err
 	}

 	var ksizes [256]int
@@ -55,4 +59,6 @@ func account(ldb backend.Backend) {
 	}
 	fmt.Fprintf(tw, "Total\t%d items,\t%d KB keys +\t%d KB data.\t\n", toti, totks/1000, totds/1000)
 	tw.Flush()
+
+	return nil
 }
--- a/cmd/syncthing/cli/index_dump.go
+++ b/cmd/syncthing/cli/index_dump.go
@@ -4,23 +4,27 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

-package main
+package cli

 import (
 	"encoding/binary"
 	"fmt"
-	"log"
 	"time"

+	"github.com/urfave/cli"
+
 	"github.com/syncthing/syncthing/lib/db"
-	"github.com/syncthing/syncthing/lib/db/backend"
 	"github.com/syncthing/syncthing/lib/protocol"
 )

-func dump(ldb backend.Backend) {
+func indexDump(*cli.Context) error {
+	ldb, err := getDB()
+	if err != nil {
+		return err
+	}
 	it, err := ldb.NewPrefixIterator(nil)
 	if err != nil {
-		log.Fatal(err)
+		return err
 	}
 	for it.Next() {
 		key := it.Key()
@@ -34,7 +38,7 @@ func dump(ldb backend.Backend) {
 			var f protocol.FileInfo
 			err := f.Unmarshal(it.Value())
 			if err != nil {
-				log.Fatal(err)
+				return err
 			}
 			fmt.Printf(" V:%v\n", f)

@@ -61,10 +65,10 @@ func dump(ldb backend.Backend) {
 			folder := binary.BigEndian.Uint32(key[1:])
 			name := nulString(key[1+4:])
 			val := it.Value()
-			var real, virt time.Time
-			real.UnmarshalBinary(val[:len(val)/2])
-			virt.UnmarshalBinary(val[len(val)/2:])
-			fmt.Printf("[mtime] F:%d N:%q R:%v V:%v\n", folder, name, real, virt)
+			var realTime, virtualTime time.Time
+			realTime.UnmarshalBinary(val[:len(val)/2])
+			virtualTime.UnmarshalBinary(val[len(val)/2:])
+			fmt.Printf("[mtime] F:%d N:%q R:%v V:%v\n", folder, name, realTime, virtualTime)

 		case db.KeyTypeFolderIdx:
 			key := binary.BigEndian.Uint32(key[1:])
@@ -91,7 +95,13 @@ func dump(ldb backend.Backend) {

 		case db.KeyTypeFolderMeta:
 			folder := binary.BigEndian.Uint32(key[1:])
-			fmt.Printf("[foldermeta] F:%d V:%x\n", folder, it.Value())
+			fmt.Printf("[foldermeta] F:%d", folder)
+			var cs db.CountsSet
+			if err := cs.Unmarshal(it.Value()); err != nil {
+				fmt.Printf(" (invalid)\n")
+			} else {
+				fmt.Printf(" V:%v\n", cs)
+			}

 		case db.KeyTypeMiscData:
 			fmt.Printf("[miscdata] K:%q V:%q\n", key[1:], it.Value())
@@ -116,10 +126,35 @@ func dump(ldb backend.Backend) {
 			fmt.Printf("[blocklistmap] F:%d H:%x N:%s\n", folder, hash, fileName)

 		case db.KeyTypeVersion:
-			fmt.Printf("[version] H:%x\n", key[1:])
+			fmt.Printf("[version] H:%x", key[1:])
+			var v protocol.Vector
+			err := v.Unmarshal(it.Value())
+			if err != nil {
+				fmt.Printf(" (invalid)\n")
+			} else {
+				fmt.Printf(" V:%v\n", v)
+			}
+
+		case db.KeyTypePendingFolder:
+			device := binary.BigEndian.Uint32(key[1:])
+			folder := string(key[5:])
+			var of db.ObservedFolder
+			of.Unmarshal(it.Value())
+			fmt.Printf("[pendingFolder] D:%d F:%s V:%v\n", device, folder, of)
+
+		case db.KeyTypePendingDevice:
+			device := "<invalid>"
+			dev, err := protocol.DeviceIDFromBytes(key[1:])
+			if err == nil {
+				device = dev.String()
+			}
+			var od db.ObservedDevice
+			od.Unmarshal(it.Value())
+			fmt.Printf("[pendingDevice] D:%v V:%v\n", device, od)

 		default:
 			fmt.Printf("[??? %d]\n  %x\n  %x\n", key[0], key, it.Value())
 		}
 	}
+	return nil
 }
--- a/cmd/syncthing/cli/index_dumpsize.go
+++ b/cmd/syncthing/cli/index_dumpsize.go
@@ -4,51 +4,38 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

-package main
+package cli

 import (
-	"container/heap"
 	"encoding/binary"
 	"fmt"
-	"log"
+	"sort"
+
+	"github.com/urfave/cli"

 	"github.com/syncthing/syncthing/lib/db"
-	"github.com/syncthing/syncthing/lib/db/backend"
 )

-type SizedElement struct {
-	key  string
-	size int
-}
+func indexDumpSize(*cli.Context) error {
+	type sizedElement struct {
+		key  string
+		size int
+	}

-type ElementHeap []SizedElement
-
-func (h ElementHeap) Len() int           { return len(h) }
-func (h ElementHeap) Less(i, j int) bool { return h[i].size > h[j].size }
-func (h ElementHeap) Swap(i, j int)      { h[i], h[j] = h[j], h[i] }
-
-func (h *ElementHeap) Push(x interface{}) {
-	*h = append(*h, x.(SizedElement))
-}
-
-func (h *ElementHeap) Pop() interface{} {
-	old := *h
-	n := len(old)
-	x := old[n-1]
-	*h = old[0 : n-1]
-	return x
-}
-
-func dumpsize(ldb backend.Backend) {
-	h := &ElementHeap{}
-	heap.Init(h)
+	ldb, err := getDB()
+	if err != nil {
+		return err
+	}

 	it, err := ldb.NewPrefixIterator(nil)
 	if err != nil {
-		log.Fatal(err)
+		return err
 	}
-	var ele SizedElement
+
+	var elems []sizedElement
 	for it.Next() {
+		var ele sizedElement
+
 		key := it.Key()
 		switch key[0] {
 		case db.KeyTypeDevice:
@@ -89,11 +76,15 @@ func dumpsize(ldb backend.Backend) {
 			ele.key = fmt.Sprintf("UNKNOWN:%x", key)
 		}
 		ele.size = len(it.Value())
-		heap.Push(h, ele)
+		elems = append(elems, ele)
 	}

-	for h.Len() > 0 {
-		ele = heap.Pop(h).(SizedElement)
+	sort.Slice(elems, func(i, j int) bool {
+		return elems[i].size > elems[j].size
+	})
+	for _, ele := range elems {
 		fmt.Println(ele.key, ele.size)
 	}
+
+	return nil
 }
--- a/cmd/syncthing/cli/index_idxck.go
+++ b/cmd/syncthing/cli/index_idxck.go
@@ -4,17 +4,18 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

-package main
+package cli

 import (
 	"bytes"
 	"encoding/binary"
+	"errors"
 	"fmt"
-	"log"
 	"sort"

+	"github.com/urfave/cli"
+
 	"github.com/syncthing/syncthing/lib/db"
-	"github.com/syncthing/syncthing/lib/db/backend"
 	"github.com/syncthing/syncthing/lib/protocol"
 )

@@ -34,7 +35,12 @@ type sequenceKey struct {
 	sequence uint64
 }

-func idxck(ldb backend.Backend) (success bool) {
+func indexCheck(*cli.Context) (err error) {
+	ldb, err := getDB()
+	if err != nil {
+		return err
+	}
+
 	folders := make(map[uint32]string)
 	devices := make(map[uint32]string)
 	deviceToIDs := make(map[string]uint32)
@@ -47,11 +53,20 @@ func idxck(ldb backend.Backend) (success bool) {
 	usedBlocklists := make(map[string]struct{})
 	usedVersions := make(map[string]struct{})
 	var localDeviceKey uint32
-	success = true
+	success := true
+	defer func() {
+		if err == nil {
+			if success {
+				fmt.Println("Index check completed succesfully.")
+			} else {
+				err = errors.New("Inconsistencies found in the index")
+			}
+		}
+	}()

 	it, err := ldb.NewPrefixIterator(nil)
 	if err != nil {
-		log.Fatal(err)
+		return err
 	}
 	for it.Next() {
 		key := it.Key()
@@ -329,14 +344,14 @@ func idxck(ldb backend.Backend) (success bool) {
 		fmt.Printf("%d version entries out of %d needs GC\n", d, len(versions))
 	}

-	return
+	return nil
 }

 func needsLocally(vl db.VersionList) bool {
-	fv, ok := vl.Get(protocol.LocalDeviceID[:])
-	if !ok {
-		return true // proviosinally, it looks like we need the file
+	gfv, gok := vl.GetGlobal()
+	if !gok { // That's weird, but we hardly need something non-existant
+		return false
 	}
-	gfv, _ := vl.GetGlobal() // Can't not have a global if we got something above
-	return !fv.Version.GreaterEqual(gfv.Version)
+	fv, ok := vl.Get(protocol.LocalDeviceID[:])
+	return db.Need(gfv, ok, fv.Version)
 }
--- a/cmd/syncthing/cli/main.go
+++ b/cmd/syncthing/cli/main.go
@@ -0,0 +1,172 @@
+// Copyright (C) 2019 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package cli
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"github.com/alecthomas/kong"
+	"github.com/flynn-archive/go-shlex"
+	"github.com/urfave/cli"
+
+	"github.com/syncthing/syncthing/cmd/syncthing/cmdutil"
+	"github.com/syncthing/syncthing/lib/config"
+)
+
+type preCli struct {
+	GUIAddress string `name:"gui-address"`
+	GUIAPIKey  string `name:"gui-apikey"`
+	HomeDir    string `name:"home"`
+	ConfDir    string `name:"config"`
+	DataDir    string `name:"data"`
+}
+
+func Run() error {
+	// This is somewhat a hack around a chicken and egg problem. We need to set
+	// the home directory and potentially other flags to know where the
+	// syncthing instance is running in order to get it's config ... which we
+	// then use to construct the actual CLI ... at which point it's too late to
+	// add flags there...
+	c := preCli{}
+	parseFlags(&c)
+	return runInternal(c, os.Args)
+}
+
+func RunWithArgs(cliArgs []string) error {
+	c := preCli{}
+	parseFlagsWithArgs(cliArgs, &c)
+	return runInternal(c, cliArgs)
+}
+
+func runInternal(c preCli, cliArgs []string) error {
+	// Not set as default above because the strings can be really long.
+	err := cmdutil.SetConfigDataLocationsFromFlags(c.HomeDir, c.ConfDir, c.DataDir)
+	if err != nil {
+		return fmt.Errorf("Command line options: %w", err)
+	}
+	clientFactory := &apiClientFactory{
+		cfg: config.GUIConfiguration{
+			RawAddress: c.GUIAddress,
+			APIKey:     c.GUIAPIKey,
+		},
+	}
+
+	configCommand, err := getConfigCommand(clientFactory)
+	if err != nil {
+		return err
+	}
+
+	// Implement the same flags at the upper CLI, but do nothing with them.
+	// This is so that the usage text is the same
+	fakeFlags := []cli.Flag{
+		cli.StringFlag{
+			Name:  "gui-address",
+			Usage: "Override GUI address to `URL` (e.g. \"http://192.0.2.42:8443\")",
+		},
+		cli.StringFlag{
+			Name:  "gui-apikey",
+			Usage: "Override GUI API key to `API-KEY`",
+		},
+		cli.StringFlag{
+			Name:  "home",
+			Usage: "Set configuration and data directory to `PATH`",
+		},
+		cli.StringFlag{
+			Name:  "config",
+			Usage: "Set configuration directory (config and keys) to `PATH`",
+		},
+		cli.StringFlag{
+			Name:  "data",
+			Usage: "Set data directory (database and logs) to `PATH`",
+		},
+	}
+
+	// Construct the actual CLI
+	app := cli.NewApp()
+	app.Author = "The Syncthing Authors"
+	app.Metadata = map[string]interface{}{
+		"clientFactory": clientFactory,
+	}
+	app.Commands = []cli.Command{{
+		Name:  "cli",
+		Usage: "Syncthing command line interface",
+		Flags: fakeFlags,
+		Subcommands: []cli.Command{
+			configCommand,
+			showCommand,
+			operationCommand,
+			errorsCommand,
+			debugCommand,
+			{
+				Name:     "-",
+				HideHelp: true,
+				Usage:    "Read commands from stdin",
+				Action: func(ctx *cli.Context) error {
+					if ctx.NArg() > 0 {
+						return errors.New("command does not expect any arguments")
+					}
+
+					// Drop the `-` not to recurse into self.
+					args := make([]string, len(cliArgs)-1)
+					copy(args, cliArgs)
+
+					fmt.Println("Reading commands from stdin...", args)
+					scanner := bufio.NewScanner(os.Stdin)
+					for scanner.Scan() {
+						input, err := shlex.Split(scanner.Text())
+						if err != nil {
+							return fmt.Errorf("parsing input: %w", err)
+						}
+						if len(input) == 0 {
+							continue
+						}
+						err = app.Run(append(args, input...))
+						if err != nil {
+							return err
+						}
+					}
+					return scanner.Err()
+				},
+			},
+		},
+	}}
+
+	return app.Run(cliArgs)
+}
+
+func parseFlags(c *preCli) error {
+	// kong only needs to parse the global arguments after "cli" and before the
+	// subcommand (if any).
+	if len(os.Args) <= 2 {
+		return nil
+	}
+	return parseFlagsWithArgs(os.Args[2:], c)
+}
+
+func parseFlagsWithArgs(args []string, c *preCli) error {
+	for i := 0; i < len(args); i++ {
+		if !strings.HasPrefix(args[i], "--") {
+			args = args[:i]
+			break
+		}
+		if !strings.Contains(args[i], "=") {
+			i++
+		}
+	}
+	// We don't want kong to print anything nor os.Exit (e.g. on -h)
+	parser, err := kong.New(c, kong.Writers(io.Discard, io.Discard), kong.Exit(func(int) {}))
+	if err != nil {
+		return err
+	}
+	_, err = parser.Parse(args)
+	return err
+}
--- a/cmd/syncthing/cli/operations.go
+++ b/cmd/syncthing/cli/operations.go
@@ -4,11 +4,16 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

-package main
+package cli

 import (
+	"bufio"
+	"errors"
 	"fmt"
+	"path/filepath"

+	"github.com/syncthing/syncthing/lib/config"
+	"github.com/syncthing/syncthing/lib/fs"
 	"github.com/urfave/cli"
 )

@@ -27,11 +32,6 @@ var operationCommand = cli.Command{
 			Usage:  "Shutdown syncthing",
 			Action: expects(0, emptyPost("system/shutdown")),
 		},
-		{
-			Name:   "reset",
-			Usage:  "Reset syncthing deleting all folders and devices",
-			Action: expects(0, emptyPost("system/reset")),
-		},
 		{
 			Name:   "upgrade",
 			Usage:  "Upgrade syncthing (if a newer version is available)",
@@ -39,15 +39,24 @@ var operationCommand = cli.Command{
 		},
 		{
 			Name:      "folder-override",
-			Usage:     "Override changes on folder (remote for sendonly, local for receiveonly)",
-			ArgsUsage: "[folder id]",
+			Usage:     "Override changes on folder (remote for sendonly, local for receiveonly). WARNING: Destructive - deletes/changes your data.",
+			ArgsUsage: "FOLDER-ID",
 			Action:    expects(1, foldersOverride),
 		},
+		{
+			Name:      "default-ignores",
+			Usage:     "Set the default ignores (config) from a file",
+			ArgsUsage: "PATH",
+			Action:    expects(1, setDefaultIgnores),
+		},
 	},
 }

 func foldersOverride(c *cli.Context) error {
-	client := c.App.Metadata["client"].(*APIClient)
+	client, err := getClientFactory(c).getClient()
+	if err != nil {
+		return err
+	}
 	cfg, err := getConfig(client)
 	if err != nil {
 		return err
@@ -69,10 +78,36 @@ func foldersOverride(c *cli.Context) error {
 				if body != "" {
 					errStr += "\nBody: " + body
 				}
-				return fmt.Errorf(errStr)
+				return errors.New(errStr)
 			}
 			return nil
 		}
 	}
-	return fmt.Errorf("Folder " + rid + " not found")
+	return fmt.Errorf("Folder %q not found", rid)
+}
+
+func setDefaultIgnores(c *cli.Context) error {
+	client, err := getClientFactory(c).getClient()
+	if err != nil {
+		return err
+	}
+	dir, file := filepath.Split(c.Args()[0])
+	filesystem := fs.NewFilesystem(fs.FilesystemTypeBasic, dir)
+
+	fd, err := filesystem.Open(file)
+	if err != nil {
+		return err
+	}
+	scanner := bufio.NewScanner(fd)
+	var lines []string
+	for scanner.Scan() {
+		lines = append(lines, scanner.Text())
+	}
+	fd.Close()
+	if err := scanner.Err(); err != nil {
+		return err
+	}
+
+	_, err = client.PutJSON("config/defaults/ignores", config.Ignores{Lines: lines})
+	return err
 }
--- a/cmd/syncthing/cli/pending.go
+++ b/cmd/syncthing/cli/pending.go
@@ -0,0 +1,45 @@
+// Copyright (C) 2021 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package cli
+
+import (
+	"net/url"
+
+	"github.com/urfave/cli"
+)
+
+var pendingCommand = cli.Command{
+	Name:     "pending",
+	HideHelp: true,
+	Usage:    "Pending subcommand group",
+	Subcommands: []cli.Command{
+		{
+			Name:   "devices",
+			Usage:  "Show pending devices",
+			Action: expects(0, indexDumpOutput("cluster/pending/devices")),
+		},
+		{
+			Name:  "folders",
+			Usage: "Show pending folders",
+			Flags: []cli.Flag{
+				cli.StringFlag{Name: "device", Usage: "Show pending folders offered by given device"},
+			},
+			Action: expects(0, folders()),
+		},
+	},
+}
+
+func folders() cli.ActionFunc {
+	return func(c *cli.Context) error {
+		if c.String("device") != "" {
+			query := make(url.Values)
+			query.Set("device", c.String("device"))
+			return indexDumpOutput("cluster/pending/folders?" + query.Encode())(c)
+		}
+		return indexDumpOutput("cluster/pending/folders")(c)
+	}
+}
--- a/cmd/syncthing/cli/show.go
+++ b/cmd/syncthing/cli/show.go
@@ -4,7 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

-package main
+package cli

 import (
 	"github.com/urfave/cli"
@@ -18,27 +18,33 @@ var showCommand = cli.Command{
 		{
 			Name:   "version",
 			Usage:  "Show syncthing client version",
-			Action: expects(0, dumpOutput("system/version")),
+			Action: expects(0, indexDumpOutput("system/version")),
 		},
 		{
 			Name:   "config-status",
 			Usage:  "Show configuration status, whether or not a restart is required for changes to take effect",
-			Action: expects(0, dumpOutput("system/config/insync")),
+			Action: expects(0, indexDumpOutput("config/restart-required")),
 		},
 		{
 			Name:   "system",
 			Usage:  "Show system status",
-			Action: expects(0, dumpOutput("system/status")),
+			Action: expects(0, indexDumpOutput("system/status")),
 		},
 		{
 			Name:   "connections",
 			Usage:  "Report about connections to other devices",
-			Action: expects(0, dumpOutput("system/connections")),
+			Action: expects(0, indexDumpOutput("system/connections")),
 		},
+		{
+			Name:   "discovery",
+			Usage:  "Show the discovered addresses of remote devices (from cache of the running syncthing instance)",
+			Action: expects(0, indexDumpOutput("system/discovery")),
+		},
+		pendingCommand,
 		{
 			Name:   "usage",
 			Usage:  "Show usage report",
-			Action: expects(0, dumpOutput("svc/report")),
+			Action: expects(0, indexDumpOutput("svc/report")),
 		},
 	},
 }
--- a/cmd/syncthing/cli/utils.go
+++ b/cmd/syncthing/cli/utils.go
@@ -0,0 +1,165 @@
+// Copyright (C) 2019 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package cli
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"mime"
+	"net/http"
+	"os"
+	"path/filepath"
+
+	"github.com/syncthing/syncthing/lib/config"
+	"github.com/syncthing/syncthing/lib/db/backend"
+	"github.com/syncthing/syncthing/lib/locations"
+	"github.com/urfave/cli"
+)
+
+func responseToBArray(response *http.Response) ([]byte, error) {
+	bytes, err := io.ReadAll(response.Body)
+	if err != nil {
+		return nil, err
+	}
+	return bytes, response.Body.Close()
+}
+
+func emptyPost(url string) cli.ActionFunc {
+	return func(c *cli.Context) error {
+		client, err := getClientFactory(c).getClient()
+		if err != nil {
+			return err
+		}
+		_, err = client.Post(url, "")
+		return err
+	}
+}
+
+func indexDumpOutput(url string) cli.ActionFunc {
+	return func(c *cli.Context) error {
+		client, err := getClientFactory(c).getClient()
+		if err != nil {
+			return err
+		}
+		response, err := client.Get(url)
+		if errors.Is(err, errNotFound) {
+			return errors.New("not found (folder/file not in database)")
+		}
+		if err != nil {
+			return err
+		}
+		return prettyPrintResponse(response)
+	}
+}
+
+func saveToFile(url string) cli.ActionFunc {
+	return func(c *cli.Context) error {
+		client, err := getClientFactory(c).getClient()
+		if err != nil {
+			return err
+		}
+		response, err := client.Get(url)
+		if err != nil {
+			return err
+		}
+		_, params, err := mime.ParseMediaType(response.Header.Get("Content-Disposition"))
+		if err != nil {
+			return err
+		}
+		filename := params["filename"]
+		if filename == "" {
+			return errors.New("Missing filename in response")
+		}
+		bs, err := responseToBArray(response)
+		if err != nil {
+			return err
+		}
+		f, err := os.Create(filename)
+		if err != nil {
+			return err
+		}
+		defer f.Close()
+		_, err = f.Write(bs)
+		if err != nil {
+			return err
+		}
+		fmt.Println("Wrote results to", filename)
+		return err
+	}
+}
+
+func getConfig(c APIClient) (config.Configuration, error) {
+	cfg := config.Configuration{}
+	response, err := c.Get("system/config")
+	if err != nil {
+		return cfg, err
+	}
+	bytes, err := responseToBArray(response)
+	if err != nil {
+		return cfg, err
+	}
+	err = json.Unmarshal(bytes, &cfg)
+	if err != nil {
+		return config.Configuration{}, err
+	}
+	return cfg, nil
+}
+
+func expects(n int, actionFunc cli.ActionFunc) cli.ActionFunc {
+	return func(ctx *cli.Context) error {
+		if ctx.NArg() != n {
+			plural := ""
+			if n != 1 {
+				plural = "s"
+			}
+			return fmt.Errorf("expected %d argument%s, got %d", n, plural, ctx.NArg())
+		}
+		return actionFunc(ctx)
+	}
+}
+
+func prettyPrintJSON(data interface{}) error {
+	enc := json.NewEncoder(os.Stdout)
+	enc.SetIndent("", "  ")
+	return enc.Encode(data)
+}
+
+func prettyPrintResponse(response *http.Response) error {
+	bytes, err := responseToBArray(response)
+	if err != nil {
+		return err
+	}
+	var data interface{}
+	if err := json.Unmarshal(bytes, &data); err != nil {
+		return err
+	}
+	// TODO: Check flag for pretty print format
+	return prettyPrintJSON(data)
+}
+
+func getDB() (backend.Backend, error) {
+	return backend.OpenLevelDBRO(locations.Get(locations.Database))
+}
+
+func nulString(bs []byte) string {
+	for i := range bs {
+		if bs[i] == 0 {
+			return string(bs[:i])
+		}
+	}
+	return string(bs)
+}
+
+func normalizePath(path string) string {
+	return filepath.ToSlash(filepath.Clean(path))
+}
+
+func getClientFactory(c *cli.Context) *apiClientFactory {
+	return c.App.Metadata["clientFactory"].(*apiClientFactory)
+}
--- a/cmd/syncthing/cmdutil/options_common.go
+++ b/cmd/syncthing/cmdutil/options_common.go
@@ -0,0 +1,16 @@
+// Copyright (C) 2021 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package cmdutil
+
+// CommonOptions are reused among several subcommands
+type CommonOptions struct {
+	buildCommonOptions
+	ConfDir         string `name:"config" placeholder:"PATH" help:"Set configuration directory (config and keys)"`
+	HomeDir         string `name:"home" placeholder:"PATH" help:"Set configuration and data directory"`
+	NoDefaultFolder bool   `env:"STNODEFAULTFOLDER" help:"Don't create the \"default\" folder on first startup"`
+	SkipPortProbing bool   `help:"Don't try to find free ports for GUI and listen addresses on first startup"`
+}
--- a/cmd/syncthing/cmdutil/options_others.go
+++ b/cmd/syncthing/cmdutil/options_others.go
@@ -1,10 +1,14 @@
-// Copyright (C) 2016 The Syncthing Authors.
+// Copyright (C) 2021 The Syncthing Authors.
 //
 // This Source Code Form is subject to the terms of the Mozilla Public
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

-// The existence of this file means we get 0% test coverage rather than no
-// test coverage at all. Remove when implementing an actual test.
+//go:build !windows
+// +build !windows

-package stats
+package cmdutil
+
+type buildCommonOptions struct {
+	HideConsole bool `hidden:""`
+}
--- a/cmd/syncthing/cmdutil/options_windows.go
+++ b/cmd/syncthing/cmdutil/options_windows.go
@@ -0,0 +1,11 @@
+// Copyright (C) 2021 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package cmdutil
+
+type buildCommonOptions struct {
+	HideConsole bool `name:"no-console" help:"Hide console window"`
+}
--- a/cmd/syncthing/cmdutil/util.go
+++ b/cmd/syncthing/cmdutil/util.go
@@ -0,0 +1,35 @@
+// Copyright (C) 2014 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+package cmdutil
+
+import (
+	"errors"
+
+	"github.com/syncthing/syncthing/lib/locations"
+)
+
+func SetConfigDataLocationsFromFlags(homeDir, confDir, dataDir string) error {
+	homeSet := homeDir != ""
+	confSet := confDir != ""
+	dataSet := dataDir != ""
+	switch {
+	case dataSet != confSet:
+		return errors.New("either both or none of --config and --data must be given, use --home to set both at once")
+	case homeSet && dataSet:
+		return errors.New("--home must not be used together with --config and --data")
+	case homeSet:
+		confDir = homeDir
+		dataDir = homeDir
+		fallthrough
+	case dataSet:
+		if err := locations.SetBaseDir(locations.ConfigBaseDir, confDir); err != nil {
+			return err
+		}
+		return locations.SetBaseDir(locations.DataBaseDir, dataDir)
+	}
+	return nil
+}
--- a/cmd/syncthing/crash_reporting.go
+++ b/cmd/syncthing/crash_reporting.go
@@ -10,7 +10,6 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	"io/ioutil"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -62,7 +61,7 @@ func uploadPanicLogs(ctx context.Context, urlBase, dir string) {
 // the log contents. A HEAD request is made to see if the log has already
 // been reported. If not, a PUT is made with the log contents.
 func uploadPanicLog(ctx context.Context, urlBase, file string) error {
-	data, err := ioutil.ReadFile(file)
+	data, err := os.ReadFile(file)
 	if err != nil {
 		return err
 	}
--- a/cmd/syncthing/decrypt/decrypt.go
+++ b/cmd/syncthing/decrypt/decrypt.go
@@ -0,0 +1,287 @@
+// Copyright (C) 2021 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+// Package decrypt implements the `syncthing decrypt` subcommand.
+package decrypt
+
+import (
+	"encoding/binary"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"path/filepath"
+
+	"github.com/syncthing/syncthing/lib/config"
+	"github.com/syncthing/syncthing/lib/fs"
+	"github.com/syncthing/syncthing/lib/osutil"
+	"github.com/syncthing/syncthing/lib/protocol"
+	"github.com/syncthing/syncthing/lib/scanner"
+)
+
+type CLI struct {
+	Path       string `arg:"" required:"1" help:"Path to encrypted folder"`
+	To         string `xor:"mode" placeholder:"PATH" help:"Destination directory, when decrypting"`
+	VerifyOnly bool   `xor:"mode" help:"Don't write decrypted files to disk (but verify plaintext hashes)"`
+	Password   string `help:"Folder password for decryption / verification" env:"FOLDER_PASSWORD"`
+	FolderID   string `help:"Folder ID of the encrypted folder, if it cannot be determined automatically"`
+	Continue   bool   `help:"Continue processing next file in case of error, instead of aborting"`
+	Verbose    bool   `help:"Show verbose progress information"`
+	TokenPath  string `placeholder:"PATH" help:"Path to the token file within the folder (used to determine folder ID)"`
+
+	folderKey *[32]byte
+}
+
+type storedEncryptionToken struct {
+	FolderID string
+	Token    []byte
+}
+
+func (c *CLI) Run() error {
+	log.SetFlags(0)
+
+	if c.To == "" && !c.VerifyOnly {
+		return errors.New("must set --to or --verify-only")
+	}
+
+	if c.TokenPath == "" {
+		// This is a bit long to show as default in --help
+		c.TokenPath = filepath.Join(config.DefaultMarkerName, config.EncryptionTokenName)
+	}
+
+	if c.FolderID == "" {
+		// We should try to figure out the folder ID
+		folderID, err := c.getFolderID()
+		if err != nil {
+			log.Println("No --folder-id given and couldn't read folder token")
+			return fmt.Errorf("getting folder ID: %w", err)
+		}
+
+		c.FolderID = folderID
+		if c.Verbose {
+			log.Println("Found folder ID:", c.FolderID)
+		}
+	}
+
+	c.folderKey = protocol.KeyFromPassword(c.FolderID, c.Password)
+
+	return c.walk()
+}
+
+// walk finds and processes every file in the encrypted folder
+func (c *CLI) walk() error {
+	srcFs := fs.NewFilesystem(fs.FilesystemTypeBasic, c.Path)
+	var dstFs fs.Filesystem
+	if c.To != "" {
+		dstFs = fs.NewFilesystem(fs.FilesystemTypeBasic, c.To)
+	}
+
+	return srcFs.Walk(".", func(path string, info fs.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if !info.IsRegular() {
+			return nil
+		}
+		if fs.IsInternal(path) {
+			return nil
+		}
+
+		return c.withContinue(c.process(srcFs, dstFs, path))
+	})
+}
+
+// If --continue was set we just mention the error and return nil to
+// continue processing.
+func (c *CLI) withContinue(err error) error {
+	if err == nil {
+		return nil
+	}
+	if c.Continue {
+		log.Println("Warning:", err)
+		return nil
+	}
+	return err
+}
+
+// getFolderID returns the folder ID found in the encrypted token, or an
+// error.
+func (c *CLI) getFolderID() (string, error) {
+	tokenPath := filepath.Join(c.Path, c.TokenPath)
+	bs, err := os.ReadFile(tokenPath)
+	if err != nil {
+		return "", fmt.Errorf("reading folder token: %w", err)
+	}
+
+	var tok storedEncryptionToken
+	if err := json.Unmarshal(bs, &tok); err != nil {
+		return "", fmt.Errorf("parsing folder token: %w", err)
+	}
+
+	return tok.FolderID, nil
+}
+
+// process handles the file named path in srcFs, decrypting it into dstFs
+// unless dstFs is nil.
+func (c *CLI) process(srcFs fs.Filesystem, dstFs fs.Filesystem, path string) error {
+	// Which filemode bits to preserve
+	const retainBits = fs.ModePerm | fs.ModeSetgid | fs.ModeSetuid | fs.ModeSticky
+
+	if c.Verbose {
+		log.Printf("Processing %q", path)
+	}
+
+	encFd, err := srcFs.Open(path)
+	if err != nil {
+		return err
+	}
+	defer encFd.Close()
+
+	encFi, err := loadEncryptedFileInfo(encFd)
+	if err != nil {
+		return fmt.Errorf("%s: loading metadata trailer: %w", path, err)
+	}
+
+	// Workaround for a bug in <= v1.15.0-rc.5 where we stored names
+	// in native format, while protocol expects wire format (slashes).
+	encFi.Name = osutil.NormalizedFilename(encFi.Name)
+
+	plainFi, err := protocol.DecryptFileInfo(*encFi, c.folderKey)
+	if err != nil {
+		return fmt.Errorf("%s: decrypting metadata: %w", path, err)
+	}
+
+	if c.Verbose {
+		log.Printf("Plaintext filename is %q", plainFi.Name)
+	}
+
+	var plainFd fs.File
+	if dstFs != nil {
+		if err := dstFs.MkdirAll(filepath.Dir(plainFi.Name), 0700); err != nil {
+			return fmt.Errorf("%s: %w", plainFi.Name, err)
+		}
+
+		plainFd, err = dstFs.Create(plainFi.Name)
+		if err != nil {
+			return fmt.Errorf("%s: %w", plainFi.Name, err)
+		}
+		defer plainFd.Close() // also closed explicitly in the return
+		if err := dstFs.Chmod(plainFi.Name, fs.FileMode(plainFi.Permissions&uint32(retainBits))); err != nil {
+			return fmt.Errorf("%s: %w", plainFi.Name, err)
+		}
+	}
+
+	if err := c.decryptFile(encFi, &plainFi, encFd, plainFd); err != nil {
+		// Decrypting the file failed, leaving it in an inconsistent state.
+		// Delete it. Even --continue currently doesn't mean "leave broken
+		// stuff in place", it just means "try the next file instead of
+		// aborting".
+		if plainFd != nil {
+			_ = dstFs.Remove(plainFd.Name())
+		}
+		return fmt.Errorf("%s: %s: %w", path, plainFi.Name, err)
+	} else if c.Verbose {
+		log.Printf("Data verified for %q", plainFi.Name)
+	}
+
+	if plainFd != nil {
+		if err := plainFd.Close(); err != nil {
+			return fmt.Errorf("%s: %w", plainFi.Name, err)
+		}
+		if err := dstFs.Chtimes(plainFi.Name, plainFi.ModTime(), plainFi.ModTime()); err != nil {
+			return fmt.Errorf("%s: %w", plainFi.Name, err)
+		}
+	}
+	return nil
+}
+
+// decryptFile reads, decrypts and verifies all the blocks in src, writing
+// it to dst if dst is non-nil. (If dst is nil it just becomes a
+// read-and-verify operation.)
+func (c *CLI) decryptFile(encFi *protocol.FileInfo, plainFi *protocol.FileInfo, src io.ReaderAt, dst io.WriterAt) error {
+	// The encrypted and plaintext files must consist of an equal number of blocks
+	if len(encFi.Blocks) != len(plainFi.Blocks) {
+		return fmt.Errorf("block count mismatch: encrypted %d != plaintext %d", len(encFi.Blocks), len(plainFi.Blocks))
+	}
+
+	fileKey := protocol.FileKey(plainFi.Name, c.folderKey)
+	for i, encBlock := range encFi.Blocks {
+		// Read the encrypted block
+		buf := make([]byte, encBlock.Size)
+		if _, err := src.ReadAt(buf, encBlock.Offset); err != nil {
+			return fmt.Errorf("encrypted block %d (%d bytes): %w", i, encBlock.Size, err)
+		}
+
+		// Decrypt it
+		dec, err := protocol.DecryptBytes(buf, fileKey)
+		if err != nil {
+			return fmt.Errorf("encrypted block %d (%d bytes): %w", i, encBlock.Size, err)
+		}
+
+		// Verify the block size against the expected plaintext
+		plainBlock := plainFi.Blocks[i]
+		if i == len(plainFi.Blocks)-1 && len(dec) > plainBlock.Size {
+			// The last block might be padded, which is fine (we skip the padding)
+			dec = dec[:plainBlock.Size]
+		} else if len(dec) != plainBlock.Size {
+			return fmt.Errorf("plaintext block %d size mismatch, actual %d != expected %d", i, len(dec), plainBlock.Size)
+		}
+
+		// Verify the hash against the plaintext block info
+		if !scanner.Validate(dec, plainBlock.Hash, 0) {
+			// The block decrypted correctly but fails the hash check. This
+			// is odd and unexpected, but it it's still a valid block from
+			// the source. The file might have changed while we pulled it?
+			err := fmt.Errorf("plaintext block %d (%d bytes) failed validation after decryption", i, plainBlock.Size)
+			if c.Continue {
+				log.Printf("Warning: %s: %s: %v", encFi.Name, plainFi.Name, err)
+			} else {
+				return err
+			}
+		}
+
+		// Write it to the destination, unless we're just verifying.
+		if dst != nil {
+			if _, err := dst.WriteAt(dec, plainBlock.Offset); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+// loadEncryptedFileInfo loads the encrypted FileInfo trailer from a file on
+// disk.
+func loadEncryptedFileInfo(fd fs.File) (*protocol.FileInfo, error) {
+	// Seek to the size of the trailer block
+	if _, err := fd.Seek(-4, io.SeekEnd); err != nil {
+		return nil, err
+	}
+	var bs [4]byte
+	if _, err := io.ReadFull(fd, bs[:]); err != nil {
+		return nil, err
+	}
+	size := int64(binary.BigEndian.Uint32(bs[:]))
+
+	// Seek to the start of the trailer
+	if _, err := fd.Seek(-(4 + size), io.SeekEnd); err != nil {
+		return nil, err
+	}
+	trailer := make([]byte, size)
+	if _, err := io.ReadFull(fd, trailer); err != nil {
+		return nil, err
+	}
+
+	var encFi protocol.FileInfo
+	if err := encFi.Unmarshal(trailer); err != nil {
+		return nil, err
+	}
+
+	return &encFi, nil
+}
--- a/cmd/syncthing/generate/generate.go
+++ b/cmd/syncthing/generate/generate.go
@@ -0,0 +1,138 @@
+// Copyright (C) 2021 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+// Package generate implements the `syncthing generate` subcommand.
+package generate
+
+import (
+	"bufio"
+	"context"
+	"crypto/tls"
+	"errors"
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/syncthing/syncthing/cmd/syncthing/cmdutil"
+	"github.com/syncthing/syncthing/lib/config"
+	"github.com/syncthing/syncthing/lib/events"
+	"github.com/syncthing/syncthing/lib/fs"
+	"github.com/syncthing/syncthing/lib/locations"
+	"github.com/syncthing/syncthing/lib/osutil"
+	"github.com/syncthing/syncthing/lib/protocol"
+	"github.com/syncthing/syncthing/lib/syncthing"
+)
+
+type CLI struct {
+	cmdutil.CommonOptions
+	GUIUser     string `placeholder:"STRING" help:"Specify new GUI authentication user name"`
+	GUIPassword string `placeholder:"STRING" help:"Specify new GUI authentication password (use - to read from standard input)"`
+}
+
+func (c *CLI) Run() error {
+	log.SetFlags(0)
+
+	if c.HideConsole {
+		osutil.HideConsole()
+	}
+
+	if c.HomeDir != "" {
+		if c.ConfDir != "" {
+			return errors.New("--home must not be used together with --config")
+		}
+		c.ConfDir = c.HomeDir
+	}
+	if c.ConfDir == "" {
+		c.ConfDir = locations.GetBaseDir(locations.ConfigBaseDir)
+	}
+
+	// Support reading the password from a pipe or similar
+	if c.GUIPassword == "-" {
+		reader := bufio.NewReader(os.Stdin)
+		password, _, err := reader.ReadLine()
+		if err != nil {
+			return fmt.Errorf("failed reading GUI password: %w", err)
+		}
+		c.GUIPassword = string(password)
+	}
+
+	if err := Generate(c.ConfDir, c.GUIUser, c.GUIPassword, c.NoDefaultFolder, c.SkipPortProbing); err != nil {
+		return fmt.Errorf("failed to generate config and keys: %w", err)
+	}
+	return nil
+}
+
+func Generate(confDir, guiUser, guiPassword string, noDefaultFolder, skipPortProbing bool) error {
+	dir, err := fs.ExpandTilde(confDir)
+	if err != nil {
+		return err
+	}
+
+	if err := syncthing.EnsureDir(dir, 0700); err != nil {
+		return err
+	}
+	locations.SetBaseDir(locations.ConfigBaseDir, dir)
+
+	var myID protocol.DeviceID
+	certFile, keyFile := locations.Get(locations.CertFile), locations.Get(locations.KeyFile)
+	cert, err := tls.LoadX509KeyPair(certFile, keyFile)
+	if err == nil {
+		log.Println("WARNING: Key exists; will not overwrite.")
+	} else {
+		cert, err = syncthing.GenerateCertificate(certFile, keyFile)
+		if err != nil {
+			return fmt.Errorf("create certificate: %w", err)
+		}
+	}
+	myID = protocol.NewDeviceID(cert.Certificate[0])
+	log.Println("Device ID:", myID)
+
+	cfgFile := locations.Get(locations.ConfigFile)
+	cfg, _, err := config.Load(cfgFile, myID, events.NoopLogger)
+	if fs.IsNotExist(err) {
+		if cfg, err = syncthing.DefaultConfig(cfgFile, myID, events.NoopLogger, noDefaultFolder, skipPortProbing); err != nil {
+			return fmt.Errorf("create config: %w", err)
+		}
+	} else if err != nil {
+		return fmt.Errorf("load config: %w", err)
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	go cfg.Serve(ctx)
+	defer cancel()
+
+	var updateErr error
+	waiter, err := cfg.Modify(func(cfg *config.Configuration) {
+		updateErr = updateGUIAuthentication(&cfg.GUI, guiUser, guiPassword)
+	})
+	if err != nil {
+		return fmt.Errorf("modify config: %w", err)
+	}
+
+	waiter.Wait()
+	if updateErr != nil {
+		return updateErr
+	}
+	if err := cfg.Save(); err != nil {
+		return fmt.Errorf("save config: %w", err)
+	}
+	return nil
+}
+
+func updateGUIAuthentication(guiCfg *config.GUIConfiguration, guiUser, guiPassword string) error {
+	if guiUser != "" && guiCfg.User != guiUser {
+		guiCfg.User = guiUser
+		log.Println("Updated GUI authentication user name:", guiUser)
+	}
+
+	if guiPassword != "" && guiCfg.Password != guiPassword {
+		if err := guiCfg.HashAndSetPassword(guiPassword); err != nil {
+			return fmt.Errorf("failed to set GUI authentication password: %w", err)
+		}
+		log.Println("Updated GUI authentication password.")
+	}
+	return nil
+}
--- a/cmd/syncthing/heapprof.go
+++ b/cmd/syncthing/heapprof.go
@@ -11,24 +11,17 @@ import (
 	"os"
 	"runtime"
 	"runtime/pprof"
-	"strconv"
 	"syscall"
 	"time"
 )

-func init() {
-	if innerProcess && os.Getenv("STHEAPPROFILE") != "" {
-		rate := 1
-		if i, err := strconv.Atoi(os.Getenv("STHEAPPROFILE")); err == nil {
-			rate = i
-		}
-		l.Debugln("Starting heap profiling")
-		go func() {
-			err := saveHeapProfiles(rate) // Only returns on error
-			l.Warnln("Heap profiler failed:", err)
-			panic("Heap profiler failed")
-		}()
-	}
+func startHeapProfiler() {
+	l.Debugln("Starting heap profiling")
+	go func() {
+		err := saveHeapProfiles(1) // Only returns on error
+		l.Warnln("Heap profiler failed:", err)
+		panic("Heap profiler failed")
+	}()
 }

 func saveHeapProfiles(rate int) error {
--- a/cmd/syncthing/main.go
+++ b/cmd/syncthing/main.go
--- a/cmd/syncthing/monitor.go
+++ b/cmd/syncthing/monitor.go
@@ -15,18 +15,16 @@ import (
 	"os/exec"
 	"os/signal"
 	"path/filepath"
-	"runtime"
 	"strings"
 	"syscall"
 	"time"

-	"github.com/syncthing/syncthing/lib/events"
+	"github.com/syncthing/syncthing/lib/build"
 	"github.com/syncthing/syncthing/lib/fs"
 	"github.com/syncthing/syncthing/lib/locations"
 	"github.com/syncthing/syncthing/lib/osutil"
-	"github.com/syncthing/syncthing/lib/protocol"
+	"github.com/syncthing/syncthing/lib/svcutil"
 	"github.com/syncthing/syncthing/lib/sync"
-	"github.com/syncthing/syncthing/lib/syncthing"
 )

 var (
@@ -36,20 +34,21 @@ var (
 )

 const (
-	countRestarts         = 4
-	loopThreshold         = 60 * time.Second
+	restartCounts         = 4
+	restartPause          = 1 * time.Second
+	restartLoopThreshold  = 60 * time.Second
 	logFileAutoCloseDelay = 5 * time.Second
 	logFileMaxOpenTime    = time.Minute
 	panicUploadMaxWait    = 30 * time.Second
 	panicUploadNoticeWait = 10 * time.Second
 )

-func monitorMain(runtimeOptions RuntimeOptions) {
+func monitorMain(options serveOptions) {
 	l.SetPrefix("[monitor] ")

 	var dst io.Writer = os.Stdout

-	logFile := runtimeOptions.logFile
+	logFile := locations.Get(locations.LogFile)
 	if logFile != "-" {
 		if expanded, err := fs.ExpandTilde(logFile); err == nil {
 			logFile = expanded
@@ -59,15 +58,15 @@ func monitorMain(runtimeOptions RuntimeOptions) {
 		open := func(name string) (io.WriteCloser, error) {
 			return newAutoclosedFile(name, logFileAutoCloseDelay, logFileMaxOpenTime)
 		}
-		if runtimeOptions.logMaxSize > 0 {
-			fileDst, err = newRotatedFile(logFile, open, int64(runtimeOptions.logMaxSize), runtimeOptions.logMaxFiles)
+		if options.LogMaxSize > 0 {
+			fileDst, err = newRotatedFile(logFile, open, int64(options.LogMaxSize), options.LogMaxFiles)
 		} else {
 			fileDst, err = open(logFile)
 		}
 		if err != nil {
 			l.Warnln("Failed to setup logging to file, proceeding with logging to stdout only:", err)
 		} else {
-			if runtime.GOOS == "windows" {
+			if build.IsWindows {
 				// Translate line breaks to Windows standard
 				fileDst = osutil.ReplacingWriter{
 					Writer: fileDst,
@@ -84,7 +83,16 @@ func monitorMain(runtimeOptions RuntimeOptions) {
 	}

 	args := os.Args
-	var restarts [countRestarts]time.Time
+	binary := args[0]
+	if build.IsWindows {
+		var err error
+		binary, err = expandExecutableInCurrentDirectory(binary)
+		if err != nil {
+			l.Warnln("Error starting the main Syncthing process:", err)
+			panic("Error starting the main Syncthing process")
+		}
+	}
+	var restarts [restartCounts]time.Time

 	stopSign := make(chan os.Signal, 1)
 	signal.Notify(stopSign, os.Interrupt, sigTerm)
@@ -97,15 +105,15 @@ func monitorMain(runtimeOptions RuntimeOptions) {
 	for {
 		maybeReportPanics()

-		if t := time.Since(restarts[0]); t < loopThreshold {
-			l.Warnf("%d restarts in %v; not retrying further", countRestarts, t)
-			os.Exit(syncthing.ExitError.AsInt())
+		if t := time.Since(restarts[0]); t < restartLoopThreshold {
+			l.Warnf("%d restarts in %v; not retrying further", restartCounts, t)
+			os.Exit(svcutil.ExitError.AsInt())
 		}

 		copy(restarts[0:], restarts[1:])
 		restarts[len(restarts)-1] = time.Now()

-		cmd := exec.Command(args[0], args[1:]...)
+		cmd := exec.Command(binary, args[1:]...)
 		cmd.Env = childEnv

 		stderr, err := cmd.StderrPipe()
@@ -169,31 +177,31 @@ func monitorMain(runtimeOptions RuntimeOptions) {

 		if err == nil {
 			// Successful exit indicates an intentional shutdown
-			os.Exit(syncthing.ExitSuccess.AsInt())
+			os.Exit(svcutil.ExitSuccess.AsInt())
 		}

 		if exiterr, ok := err.(*exec.ExitError); ok {
 			exitCode := exiterr.ExitCode()
-			if stopped || runtimeOptions.noRestart {
+			if stopped || options.NoRestart {
 				os.Exit(exitCode)
 			}
-			if exitCode == syncthing.ExitUpgrade.AsInt() {
+			if exitCode == svcutil.ExitUpgrade.AsInt() {
 				// Restart the monitor process to release the .old
 				// binary as part of the upgrade process.
 				l.Infoln("Restarting monitor...")
-				if err = restartMonitor(args); err != nil {
+				if err = restartMonitor(binary, args); err != nil {
 					l.Warnln("Restart:", err)
 				}
 				os.Exit(exitCode)
 			}
 		}

-		if runtimeOptions.noRestart {
-			os.Exit(syncthing.ExitError.AsInt())
+		if options.NoRestart {
+			os.Exit(svcutil.ExitError.AsInt())
 		}

 		l.Infoln("Syncthing exited:", err)
-		time.Sleep(1 * time.Second)
+		time.Sleep(restartPause)

 		if first {
 			// Let the next child process know that this is not the first time
@@ -204,6 +212,21 @@ func monitorMain(runtimeOptions RuntimeOptions) {
 	}
 }

+func expandExecutableInCurrentDirectory(args0 string) (string, error) {
+	// Works around a restriction added in go1.19 that executables in the
+	// current directory are not resolved when specifying just an executable
+	// name (like e.g. "syncthing")
+	if !strings.ContainsRune(args0, os.PathSeparator) {
+		// Check if it's in PATH
+		_, err := exec.LookPath(args0)
+		if err != nil {
+			// Try to get the path to the current executable
+			return os.Executable()
+		}
+	}
+	return args0, nil
+}
+
 func copyStderr(stderr io.Reader, dst io.Writer) {
 	br := bufio.NewReader(stderr)

@@ -310,29 +333,30 @@ func copyStdout(stdout io.Reader, dst io.Writer) {
 	}
 }

-func restartMonitor(args []string) error {
+func restartMonitor(binary string, args []string) error {
 	// Set the STRESTART environment variable to indicate to the next
 	// process that this is a restart and not initial start. This prevents
 	// opening the browser on startup.
 	os.Setenv("STRESTART", "yes")

-	if runtime.GOOS != "windows" {
+	if !build.IsWindows {
 		// syscall.Exec is the cleanest way to restart on Unixes as it
 		// replaces the current process with the new one, keeping the pid and
 		// controlling terminal and so on
-		return restartMonitorUnix(args)
+		return restartMonitorUnix(binary, args)
 	}

 	// but it isn't supported on Windows, so there we start a normal
 	// exec.Command and return.
-	return restartMonitorWindows(args)
+	return restartMonitorWindows(binary, args)
 }

-func restartMonitorUnix(args []string) error {
-	if !strings.ContainsRune(args[0], os.PathSeparator) {
+func restartMonitorUnix(binary string, args []string) error {
+	if !strings.ContainsRune(binary, os.PathSeparator) {
 		// The path to the binary doesn't contain a slash, so it should be
 		// found in $PATH.
-		binary, err := exec.LookPath(args[0])
+		var err error
+		binary, err = exec.LookPath(binary)
 		if err != nil {
 			return err
 		}
@@ -342,8 +366,8 @@ func restartMonitorUnix(args []string) error {
 	return syscall.Exec(args[0], args, os.Environ())
 }

-func restartMonitorWindows(args []string) error {
-	cmd := exec.Command(args[0], args[1:]...)
+func restartMonitorWindows(binary string, args []string) error {
+	cmd := exec.Command(binary, args[1:]...)
 	// Retain the standard streams
 	cmd.Stderr = os.Stderr
 	cmd.Stdout = os.Stdout
@@ -563,7 +587,7 @@ func childEnv() []string {
 // panicUploadMaxWait uploading panics...
 func maybeReportPanics() {
 	// Try to get a config to see if/where panics should be reported.
-	cfg, err := loadOrDefaultConfig(protocol.EmptyDeviceID, events.NoopLogger)
+	cfg, err := loadOrDefaultConfig()
 	if err != nil {
 		l.Warnln("Couldn't load config; not reporting crash")
 		return
--- a/cmd/syncthing/monitor_test.go
+++ b/cmd/syncthing/monitor_test.go
@@ -8,7 +8,6 @@ package main

 import (
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -18,14 +17,17 @@ import (
 func TestRotatedFile(t *testing.T) {
 	// Verify that log rotation happens.

-	dir, err := ioutil.TempDir("", "syncthing")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(dir)
+	dir := t.TempDir()

 	open := func(name string) (io.WriteCloser, error) {
-		return os.Create(name)
+		f, err := os.Create(name)
+		t.Cleanup(func() {
+			if f != nil {
+				_ = f.Close()
+			}
+		})
+
+		return f, err
 	}

 	logName := filepath.Join(dir, "log.txt")
@@ -179,7 +181,7 @@ func TestAutoClosedFile(t *testing.T) {
 	}

 	// The file should have both writes in it.
-	bs, err := ioutil.ReadFile(file)
+	bs, err := os.ReadFile(file)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -199,7 +201,7 @@ func TestAutoClosedFile(t *testing.T) {
 	}

 	// It should now contain three writes, as the file is always opened for appending
-	bs, err = ioutil.ReadFile(file)
+	bs, err = os.ReadFile(file)
 	if err != nil {
 		t.Fatal(err)
 	}
--- a/cmd/syncthing/openurl_unix.go
+++ b/cmd/syncthing/openurl_unix.go
@@ -4,26 +4,25 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

+//go:build !windows
 // +build !windows

 package main

 import (
 	"os/exec"
-	"runtime"
 	"syscall"
+
+	"github.com/syncthing/syncthing/lib/build"
 )

 func openURL(url string) error {
-	switch runtime.GOOS {
-	case "darwin":
+	if build.IsDarwin {
 		return exec.Command("open", url).Run()
-
-	default:
-		cmd := exec.Command("xdg-open", url)
-		cmd.SysProcAttr = &syscall.SysProcAttr{
-			Setpgid: true,
-		}
-		return cmd.Run()
 	}
+	cmd := exec.Command("xdg-open", url)
+	cmd.SysProcAttr = &syscall.SysProcAttr{
+		Setpgid: true,
+	}
+	return cmd.Run()
 }
--- a/cmd/syncthing/openurl_windows.go
+++ b/cmd/syncthing/openurl_windows.go
@@ -4,6 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

+//go:build windows
 // +build windows

 package main
--- a/cmd/syncthing/perfstats_unix.go
+++ b/cmd/syncthing/perfstats_unix.go
@@ -4,6 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

+//go:build !solaris && !windows
 // +build !solaris,!windows

 package main
@@ -18,10 +19,8 @@ import (
 	"github.com/syncthing/syncthing/lib/protocol"
 )

-func init() {
-	if innerProcess && os.Getenv("STPERFSTATS") != "" {
-		go savePerfStats(fmt.Sprintf("perfstats-%d.csv", syscall.Getpid()))
-	}
+func startPerfStats() {
+	go savePerfStats(fmt.Sprintf("perfstats-%d.csv", syscall.Getpid()))
 }

 func savePerfStats(file string) {
--- a/cmd/syncthing/perfstats_unsupported.go
+++ b/cmd/syncthing/perfstats_unsupported.go
@@ -1,13 +1,13 @@
-// Copyright (C) 2017 The Syncthing Authors.
+// Copyright (C) 2021 The Syncthing Authors.
 //
 // This Source Code Form is subject to the terms of the Mozilla Public
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

-//+build noupgrade
+//go:build solaris || windows
+// +build solaris windows

-package build
+package main

-func init() {
-	Tags = append(Tags, "noupgrade")
+func startPerfStats() {
 }
--- a/cmd/syncthing/traceback.go
+++ b/cmd/syncthing/traceback.go
@@ -4,7 +4,8 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.

-//+build go1.7
+//go:build go1.7
+// +build go1.7

 package main

--- a/cmd/syncthing/usage.go
+++ b/cmd/syncthing/usage.go
@@ -1,57 +0,0 @@
-// Copyright (C) 2014 The Syncthing Authors.
-//
-// This Source Code Form is subject to the terms of the Mozilla Public
-// License, v. 2.0. If a copy of the MPL was not distributed with this file,
-// You can obtain one at https://mozilla.org/MPL/2.0/.
-
-package main
-
-import (
-	"bytes"
-	"flag"
-	"fmt"
-	"io"
-	"text/tabwriter"
-)
-
-func optionTable(w io.Writer, rows [][]string) {
-	tw := tabwriter.NewWriter(w, 2, 4, 2, ' ', 0)
-	for _, row := range rows {
-		for i, cell := range row {
-			if i > 0 {
-				tw.Write([]byte("\t"))
-			}
-			tw.Write([]byte(cell))
-		}
-		tw.Write([]byte("\n"))
-	}
-	tw.Flush()
-}
-
-func usageFor(fs *flag.FlagSet, usage string, extra string) func() {
-	return func() {
-		var b bytes.Buffer
-		b.WriteString("Usage:\n  " + usage + "\n")
-
-		var options [][]string
-		fs.VisitAll(func(f *flag.Flag) {
-			var opt = "  -" + f.Name
-
-			if f.DefValue != "false" {
-				opt += "=" + fmt.Sprintf(`"%s"`, f.DefValue)
-			}
-			options = append(options, []string{opt, f.Usage})
-		})
-
-		if len(options) > 0 {
-			b.WriteString("\nOptions:\n")
-			optionTable(&b, options)
-		}
-
-		fmt.Println(b.String())
-
-		if len(extra) > 0 {
-			fmt.Println(extra)
-		}
-	}
-}
--- a/cmd/uraggregate/main.go
+++ b/cmd/uraggregate/main.go
@@ -47,32 +47,32 @@ func main() {
 func runAggregation(db *sql.DB) {
 	since := maxIndexedDay(db, "VersionSummary")
 	log.Println("Aggregating VersionSummary data since", since)
-	rows, err := aggregateVersionSummary(db, since)
+	rows, err := aggregateVersionSummary(db, since.Add(24*time.Hour))
 	if err != nil {
-		log.Fatalln("aggregate:", err)
+		log.Println("aggregate:", err)
 	}
 	log.Println("Inserted", rows, "rows")

 	log.Println("Aggregating UserMovement data")
 	rows, err = aggregateUserMovement(db)
 	if err != nil {
-		log.Fatalln("aggregate:", err)
+		log.Println("aggregate:", err)
 	}
 	log.Println("Inserted", rows, "rows")

-	log.Println("Aggregating Performance data")
 	since = maxIndexedDay(db, "Performance")
-	rows, err = aggregatePerformance(db, since)
+	log.Println("Aggregating Performance data since", since)
+	rows, err = aggregatePerformance(db, since.Add(24*time.Hour))
 	if err != nil {
-		log.Fatalln("aggregate:", err)
+		log.Println("aggregate:", err)
 	}
 	log.Println("Inserted", rows, "rows")

-	log.Println("Aggregating BlockStats data")
 	since = maxIndexedDay(db, "BlockStats")
-	rows, err = aggregateBlockStats(db, since)
+	log.Println("Aggregating BlockStats data since", since)
+	rows, err = aggregateBlockStats(db, since.Add(24*time.Hour))
 	if err != nil {
-		log.Fatalln("aggregate:", err)
+		log.Println("aggregate:", err)
 	}
 	log.Println("Inserted", rows, "rows")
 }
@@ -135,35 +135,35 @@ func setupDB(db *sql.DB) error {

 	row := db.QueryRow(`SELECT 'UniqueDayVersionIndex'::regclass`)
 	if err := row.Scan(&t); err != nil {
-		_, err = db.Exec(`CREATE UNIQUE INDEX UniqueDayVersionIndex ON VersionSummary (Day, Version)`)
+		_, _ = db.Exec(`CREATE UNIQUE INDEX UniqueDayVersionIndex ON VersionSummary (Day, Version)`)
 	}

 	row = db.QueryRow(`SELECT 'VersionDayIndex'::regclass`)
 	if err := row.Scan(&t); err != nil {
-		_, err = db.Exec(`CREATE INDEX VersionDayIndex ON VersionSummary (Day)`)
+		_, _ = db.Exec(`CREATE INDEX VersionDayIndex ON VersionSummary (Day)`)
 	}

 	row = db.QueryRow(`SELECT 'MovementDayIndex'::regclass`)
 	if err := row.Scan(&t); err != nil {
-		_, err = db.Exec(`CREATE INDEX MovementDayIndex ON UserMovement (Day)`)
+		_, _ = db.Exec(`CREATE INDEX MovementDayIndex ON UserMovement (Day)`)
 	}

 	row = db.QueryRow(`SELECT 'PerformanceDayIndex'::regclass`)
 	if err := row.Scan(&t); err != nil {
-		_, err = db.Exec(`CREATE INDEX PerformanceDayIndex ON Performance (Day)`)
+		_, _ = db.Exec(`CREATE INDEX PerformanceDayIndex ON Performance (Day)`)
 	}

 	row = db.QueryRow(`SELECT 'BlockStatsDayIndex'::regclass`)
 	if err := row.Scan(&t); err != nil {
-		_, err = db.Exec(`CREATE INDEX BlockStatsDayIndex ON BlockStats (Day)`)
+		_, _ = db.Exec(`CREATE INDEX BlockStatsDayIndex ON BlockStats (Day)`)
 	}

-	return err
+	return nil
 }

 func maxIndexedDay(db *sql.DB, table string) time.Time {
 	var t time.Time
-	row := db.QueryRow("SELECT MAX(Day) FROM " + table)
+	row := db.QueryRow("SELECT MAX(DATE_TRUNC('day', Day)) FROM " + table)
 	err := row.Scan(&t)
 	if err != nil {
 		return time.Time{}
@@ -179,8 +179,8 @@ func aggregateVersionSummary(db *sql.DB, since time.Time) (int64, error) {
 		COUNT(*) AS Count
 		FROM ReportsJson
 		WHERE
-			DATE_TRUNC('day', Received) > $1
-			AND DATE_TRUNC('day', Received) < DATE_TRUNC('day', NOW())
+			Received > $1
+			AND Received < DATE_TRUNC('day', NOW())
 			AND Report->>'version' like 'v_.%'
 		GROUP BY Day, Ver
 		);
@@ -198,7 +198,8 @@ func aggregateUserMovement(db *sql.DB) (int64, error) {
 		Report->>'uniqueID'
 		FROM ReportsJson
 		WHERE
-			DATE_TRUNC('day', Received) < DATE_TRUNC('day', NOW())
+			Report->>'uniqueID' IS NOT NULL
+			AND Received < DATE_TRUNC('day', NOW())
 			AND Report->>'version' like 'v_.%'
 		ORDER BY Day
 	`)
@@ -283,9 +284,11 @@ func aggregatePerformance(db *sql.DB, since time.Time) (int64, error) {
 		AVG((Report->>'memoryUsageMiB')::numeric) As MemoryUsageMiB
 		FROM ReportsJson
 		WHERE
-			DATE_TRUNC('day', Received) > $1
-			AND DATE_TRUNC('day', Received) < DATE_TRUNC('day', NOW())
+			Received > $1
+			AND Received < DATE_TRUNC('day', NOW())
 			AND Report->>'version' like 'v_.%'
+			/* Some custom implementation reported bytes when we expect megabytes, cap at petabyte */
+			AND (Report->>'memorySize')::numeric < 1073741824
 		GROUP BY Day
 		);
 	`, since)
@@ -312,8 +315,8 @@ func aggregateBlockStats(db *sql.DB, since time.Time) (int64, error) {
 		SUM((Report->'blockStats'->>'copyElsewhere')::numeric) AS CopyElsewhere
 		FROM ReportsJson
 		WHERE
-			DATE_TRUNC('day', Received) > $1
-			AND DATE_TRUNC('day', Received) < DATE_TRUNC('day', NOW())
+			Received > $1
+			AND Received < DATE_TRUNC('day', NOW())
 			AND (Report->>'urVersion')::numeric >= 3
 			AND Report->>'version' like 'v_.%'
 			AND Report->>'version' NOT LIKE 'v0.14.40%'
--- a/cmd/ursrv/main.go
+++ b/cmd/ursrv/main.go
@@ -13,7 +13,6 @@ import (
 	"encoding/json"
 	"html/template"
 	"io"
-	"io/ioutil"
 	"log"
 	"net"
 	"net/http"
@@ -27,7 +26,10 @@ import (
 	"unicode"

 	"github.com/oschwald/geoip2-golang"
+	"golang.org/x/text/cases"
+	"golang.org/x/text/language"

+	"github.com/syncthing/syncthing/lib/upgrade"
 	"github.com/syncthing/syncthing/lib/ur/contract"
 )

@@ -47,19 +49,19 @@ var (
 	knownDistributions = []distributionMatch{
 		// Maps well known builders to the official distribution method that
 		// they represent
-		{regexp.MustCompile("android-.*teamcity@build.syncthing.net"), "Google Play"},
-		{regexp.MustCompile("teamcity@build.syncthing.net"), "GitHub"},
-		{regexp.MustCompile("deb@build.syncthing.net"), "APT"},
-		{regexp.MustCompile("docker@syncthing.net"), "Docker Hub"},
-		{regexp.MustCompile("jenkins@build.syncthing.net"), "GitHub"},
-		{regexp.MustCompile("snap@build.syncthing.net"), "Snapcraft"},
-		{regexp.MustCompile("android-.*vagrant@basebox-stretch64"), "F-Droid"},
-		{regexp.MustCompile("builduser@svetlemodry"), "Arch (3rd party)"},
-		{regexp.MustCompile("synology@kastelo.net"), "Synology (Kastelo)"},
-		{regexp.MustCompile("@debian"), "Debian (3rd party)"},
-		{regexp.MustCompile("@fedora"), "Fedora (3rd party)"},
+		{regexp.MustCompile(`android-.*teamcity@build\.syncthing\.net`), "Google Play"},
+		{regexp.MustCompile(`teamcity@build\.syncthing\.net`), "GitHub"},
+		{regexp.MustCompile(`deb@build\.syncthing\.net`), "APT"},
+		{regexp.MustCompile(`docker@syncthing\.net`), "Docker Hub"},
+		{regexp.MustCompile(`jenkins@build\.syncthing\.net`), "GitHub"},
+		{regexp.MustCompile(`snap@build\.syncthing\.net`), "Snapcraft"},
+		{regexp.MustCompile(`android-.*vagrant@basebox-stretch64`), "F-Droid"},
+		{regexp.MustCompile(`builduser@(archlinux|svetlemodry)`), "Arch (3rd party)"},
+		{regexp.MustCompile(`synology@kastelo\.net`), "Synology (Kastelo)"},
+		{regexp.MustCompile(`@debian`), "Debian (3rd party)"},
+		{regexp.MustCompile(`@fedora`), "Fedora (3rd party)"},
 		{regexp.MustCompile(`\bbrew@`), "Homebrew (3rd party)"},
-		{regexp.MustCompile("."), "Others"},
+		{regexp.MustCompile(`.`), "Others"},
 	}
 )

@@ -88,7 +90,7 @@ var funcs = map[string]interface{}{
 			parts = append(parts, part)
 		}
 		if len(input) > 0 {
-			parts = append(parts, input[:])
+			parts = append(parts, input)
 		}
 		return parts[whichPart-1]
 	},
@@ -161,7 +163,7 @@ func main() {
 	if err != nil {
 		log.Fatalln("template:", err)
 	}
-	bs, err := ioutil.ReadAll(fd)
+	bs, err := io.ReadAll(fd)
 	if err != nil {
 		log.Fatalln("template:", err)
 	}
@@ -284,7 +286,7 @@ func rootHandler(db *sql.DB, w http.ResponseWriter, r *http.Request) {
 	}
 }

-func locationsHandler(db *sql.DB, w http.ResponseWriter, r *http.Request) {
+func locationsHandler(db *sql.DB, w http.ResponseWriter, _ *http.Request) {
 	cacheMut.Lock()
 	defer cacheMut.Unlock()

@@ -323,7 +325,7 @@ func newDataHandler(db *sql.DB, w http.ResponseWriter, r *http.Request) {
 	rep.Address = addr

 	lr := &io.LimitedReader{R: r.Body, N: 40 * 1024}
-	bs, _ := ioutil.ReadAll(lr)
+	bs, _ := io.ReadAll(lr)
 	if err := json.Unmarshal(bs, &rep); err != nil {
 		log.Println("decode:", err)
 		if debug {
@@ -377,7 +379,7 @@ func summaryHandler(db *sql.DB, w http.ResponseWriter, r *http.Request) {
 	w.Write(bs)
 }

-func movementHandler(db *sql.DB, w http.ResponseWriter, r *http.Request) {
+func movementHandler(db *sql.DB, w http.ResponseWriter, _ *http.Request) {
 	s, err := getMovement(db)
 	if err != nil {
 		log.Println("movementHandler:", err)
@@ -396,7 +398,7 @@ func movementHandler(db *sql.DB, w http.ResponseWriter, r *http.Request) {
 	w.Write(bs)
 }

-func performanceHandler(db *sql.DB, w http.ResponseWriter, r *http.Request) {
+func performanceHandler(db *sql.DB, w http.ResponseWriter, _ *http.Request) {
 	s, err := getPerformance(db)
 	if err != nil {
 		log.Println("performanceHandler:", err)
@@ -415,7 +417,7 @@ func performanceHandler(db *sql.DB, w http.ResponseWriter, r *http.Request) {
 	w.Write(bs)
 }

-func blockStatsHandler(db *sql.DB, w http.ResponseWriter, r *http.Request) {
+func blockStatsHandler(db *sql.DB, w http.ResponseWriter, _ *http.Request) {
 	s, err := getBlockStats(db)
 	if err != nil {
 		log.Println("blockStatsHandler:", err)
@@ -724,8 +726,8 @@ func getReport(db *sql.DB) map[string]interface{} {

 			if rep.NATType != "" {
 				natType := rep.NATType
-				natType = strings.Replace(natType, "unknown", "Unknown", -1)
-				natType = strings.Replace(natType, "Symetric", "Symmetric", -1)
+				natType = strings.ReplaceAll(natType, "unknown", "Unknown")
+				natType = strings.ReplaceAll(natType, "Symetric", "Symmetric")
 				add(featureGroups["Various"]["v3"], "NAT Type", natType, 1)
 			}

@@ -743,6 +745,8 @@ func getReport(db *sql.DB) map[string]interface{} {
 			inc(features["Folder"]["v3"], "Weak hash, always", rep.FolderUsesV3.AlwaysWeakHash)
 			inc(features["Folder"]["v3"], "Weak hash, custom threshold", rep.FolderUsesV3.CustomWeakHashThreshold)
 			inc(features["Folder"]["v3"], "Filesystem watcher", rep.FolderUsesV3.FsWatcherEnabled)
+			inc(features["Folder"]["v3"], "Case sensitive FS", rep.FolderUsesV3.CaseSensitiveFS)
+			inc(features["Folder"]["v3"], "Mode, receive encrypted", rep.FolderUsesV3.ReceiveEncrypted)

 			add(featureGroups["Folder"]["v3"], "Conflicts", "Disabled", rep.FolderUsesV3.ConflictsDisabled)
 			add(featureGroups["Folder"]["v3"], "Conflicts", "Unlimited", rep.FolderUsesV3.ConflictsUnlimited)
@@ -752,6 +756,8 @@ func getReport(db *sql.DB) map[string]interface{} {
 				add(featureGroups["Folder"]["v3"], "Pull Order", prettyCase(key), value)
 			}

+			inc(features["Device"]["v3"], "Untrusted", rep.DeviceUsesV3.Untrusted)
+
 			totals["GUI"] += rep.GUIStats.Enabled

 			inc(features["GUI"]["v3"], "Auth Enabled", rep.GUIStats.UseAuth)
@@ -769,7 +775,7 @@ func getReport(db *sql.DB) map[string]interface{} {
 			}

 			for transport, count := range rep.TransportStats {
-				add(featureGroups["Connection"]["v3"], "Transport", strings.Title(transport), count)
+				add(featureGroups["Connection"]["v3"], "Transport", cases.Title(language.English).String(transport), count)
 				if strings.HasSuffix(transport, "4") {
 					add(featureGroups["Connection"]["v3"], "IP version", "IPv4", count)
 				} else if strings.HasSuffix(transport, "6") {
@@ -781,72 +787,53 @@ func getReport(db *sql.DB) map[string]interface{} {
 		}
 	}

-	var categories []category
-	categories = append(categories, category{
-		Values: statsForInts(totFiles),
-		Descr:  "Files Managed per Device",
-	})
-
-	categories = append(categories, category{
-		Values: statsForInts(maxFiles),
-		Descr:  "Files in Largest Folder",
-	})
-
-	categories = append(categories, category{
-		Values: statsForInt64s(totMiB),
-		Descr:  "Data Managed per Device",
-		Unit:   "B",
-		Type:   NumberBinary,
-	})
-
-	categories = append(categories, category{
-		Values: statsForInt64s(maxMiB),
-		Descr:  "Data in Largest Folder",
-		Unit:   "B",
-		Type:   NumberBinary,
-	})
-
-	categories = append(categories, category{
-		Values: statsForInts(numDevices),
-		Descr:  "Number of Devices in Cluster",
-	})
-
-	categories = append(categories, category{
-		Values: statsForInts(numFolders),
-		Descr:  "Number of Folders Configured",
-	})
-
-	categories = append(categories, category{
-		Values: statsForInt64s(memoryUsage),
-		Descr:  "Memory Usage",
-		Unit:   "B",
-		Type:   NumberBinary,
-	})
-
-	categories = append(categories, category{
-		Values: statsForInt64s(memorySize),
-		Descr:  "System Memory",
-		Unit:   "B",
-		Type:   NumberBinary,
-	})
-
-	categories = append(categories, category{
-		Values: statsForFloats(sha256Perf),
-		Descr:  "SHA-256 Hashing Performance",
-		Unit:   "B/s",
-		Type:   NumberBinary,
-	})
-
-	categories = append(categories, category{
-		Values: statsForInts(numCPU),
-		Descr:  "Number of CPU cores",
-	})
-
-	categories = append(categories, category{
-		Values: statsForInts(uptime),
-		Descr:  "Uptime (v3)",
-		Type:   NumberDuration,
-	})
+	categories := []category{
+		{
+			Values: statsForInts(totFiles),
+			Descr:  "Files Managed per Device",
+		}, {
+			Values: statsForInts(maxFiles),
+			Descr:  "Files in Largest Folder",
+		}, {
+			Values: statsForInt64s(totMiB),
+			Descr:  "Data Managed per Device",
+			Unit:   "B",
+			Type:   NumberBinary,
+		}, {
+			Values: statsForInt64s(maxMiB),
+			Descr:  "Data in Largest Folder",
+			Unit:   "B",
+			Type:   NumberBinary,
+		}, {
+			Values: statsForInts(numDevices),
+			Descr:  "Number of Devices in Cluster",
+		}, {
+			Values: statsForInts(numFolders),
+			Descr:  "Number of Folders Configured",
+		}, {
+			Values: statsForInt64s(memoryUsage),
+			Descr:  "Memory Usage",
+			Unit:   "B",
+			Type:   NumberBinary,
+		}, {
+			Values: statsForInt64s(memorySize),
+			Descr:  "System Memory",
+			Unit:   "B",
+			Type:   NumberBinary,
+		}, {
+			Values: statsForFloats(sha256Perf),
+			Descr:  "SHA-256 Hashing Performance",
+			Unit:   "B/s",
+			Type:   NumberBinary,
+		}, {
+			Values: statsForInts(numCPU),
+			Descr:  "Number of CPU cores",
+		}, {
+			Values: statsForInts(uptime),
+			Descr:  "Uptime (v3)",
+			Type:   NumberDuration,
+		},
+	}

 	reportFeatures := make(map[string][]feature)
 	for featureType, versions := range features {
@@ -918,7 +905,7 @@ func getReport(db *sql.DB) map[string]interface{} {
 }

 var (
-	plusRe  = regexp.MustCompile(`\+.*$`)
+	plusRe  = regexp.MustCompile(`(\+.*|\.dev\..*)$`)
 	plusStr = "(+dev)"
 )

@@ -977,7 +964,9 @@ func (s *summary) MarshalJSON() ([]byte, error) {
 	for v := range s.versions {
 		versions = append(versions, v)
 	}
-	sort.Strings(versions)
+	sort.Slice(versions, func(a, b int) bool {
+		return upgrade.CompareVersions(versions[a], versions[b]) < 0
+	})

 	var filtered []string
 	for _, v := range versions {
--- a/etc/firewall-ufw/syncthing
+++ b/etc/firewall-ufw/syncthing
@@ -1,7 +1,7 @@
 [syncthing]
 title=Syncthing
 description=Syncthing file synchronisation
-ports=22000/tcp|21027/udp
+ports=22000|21027/udp

 [syncthing-gui]
 title=Syncthing-GUI
--- a/etc/freebsd-rc/syncthing
+++ b/etc/freebsd-rc/syncthing
@@ -38,13 +38,14 @@ syncthing_group=${syncthing_group:-$syncthing_user}

 command=/usr/local/bin/syncthing
 pidfile=/var/run/syncthing.pid
-syncthing_flags="${syncthing_home:+-home=${syncthing_home}} ${syncthing_log_file:+-logfile=${syncthing_log_file}}"
+syncthing_cmd=serve
+syncthing_flags="${syncthing_home:+--home=${syncthing_home}} ${syncthing_log_file:+--logfile=${syncthing_log_file}}"

 syncthing_start() {
    echo "Starting syncthing"
    touch ${pidfile} && chown ${syncthing_user} ${pidfile}
    touch ${syncthing_log_file} && chown ${syncthing_user} ${syncthing_log_file}
-    /usr/sbin/daemon -cf -p ${pidfile} -u ${syncthing_user} ${command} ${syncthing_flags}
+    /usr/sbin/daemon -cf -p ${pidfile} -u ${syncthing_user} ${command} ${syncthing_cmd} ${syncthing_flags}
 }

 syncthing_cleanup() {
--- a/etc/linux-desktop/syncthing-start.desktop
+++ b/etc/linux-desktop/syncthing-start.desktop
@@ -2,7 +2,7 @@
 Name=Start Syncthing
 GenericName=File synchronization
 Comment=Starts the main syncthing process in the background.
-Exec=/usr/bin/syncthing -no-browser -logfile=default
+Exec=/usr/bin/syncthing serve --no-browser --logfile=default
 Icon=syncthing
 Terminal=false
 Type=Application
--- a/etc/linux-runit/run
+++ b/etc/linux-runit/run
@@ -5,5 +5,4 @@ export HOME="/home/$USERNAME"
 export SYNCTHING="$HOME/bin/syncthing"

 exec 2>&1
-exec chpst -u "$USERNAME" "$SYNCTHING" -logflags 0
-
+exec chpst -u "$USERNAME" "$SYNCTHING" serve --logflags 0
--- a/etc/linux-sysctl/30-syncthing.conf
+++ b/etc/linux-sysctl/30-syncthing.conf
@@ -0,0 +1,3 @@
+# Increase maximum receive socket buffer size to 2MiB for QUIC connections
+# see https://github.com/lucas-clemente/quic-go/wiki/UDP-Receive-Buffer-Size
+net.core.rmem_max = 2097152
--- a/etc/linux-sysctl/README.md
+++ b/etc/linux-sysctl/README.md
@@ -0,0 +1,21 @@
+sysctl configuration to raise UDP buffer size
+===================
+Installation
+-----------
+**Please note:** When you installed syncthing using the official deb package, you can skip the copying.
+
+Copy the file `30-syncthing.conf` to `/etc/sysctl.d/` (root permissions required).
+
+In a terminal run
+```
+sudo sysctl -q --system
+```
+to apply the sysctl changes.
+
+
+Verification
+----------
+You can verify that the new limit is active using
+```
+sysctl net.core.rmem_max
+```
--- a/etc/linux-systemd/system/syncthing@.service
+++ b/etc/linux-systemd/system/syncthing@.service
@@ -2,12 +2,14 @@
 Description=Syncthing - Open Source Continuous File Synchronization for %I
 Documentation=man:syncthing(1)
 After=network.target
+StartLimitIntervalSec=60
+StartLimitBurst=4

 [Service]
 User=%i
-ExecStart=/usr/bin/syncthing -no-browser -no-restart -logflags=0
+ExecStart=/usr/bin/syncthing serve --no-browser --no-restart --logflags=0
 Restart=on-failure
-RestartSec=5
+RestartSec=1
 SuccessExitStatus=3 4
 RestartForceExitStatus=3 4

--- a/etc/linux-systemd/user/syncthing.service
+++ b/etc/linux-systemd/user/syncthing.service
@@ -1,11 +1,13 @@
 [Unit]
 Description=Syncthing - Open Source Continuous File Synchronization
 Documentation=man:syncthing(1)
+StartLimitIntervalSec=60
+StartLimitBurst=4

 [Service]
-ExecStart=/usr/bin/syncthing -no-browser -no-restart -logflags=0
+ExecStart=/usr/bin/syncthing serve --no-browser --no-restart --logflags=0
 Restart=on-failure
-RestartSec=5
+RestartSec=1
 SuccessExitStatus=3 4
 RestartForceExitStatus=3 4

--- a/go.mod
+++ b/go.mod
@@ -1,52 +1,86 @@
 module github.com/syncthing/syncthing

+go 1.18
+
 require (
-	github.com/AudriusButkevicius/pfilter v0.0.0-20190627213056-c55ef6137fc6
-	github.com/AudriusButkevicius/recli v0.0.5
-	github.com/Azure/go-ntlmssp v0.0.0-20200615164410-66371956d46c // indirect
-	github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d // indirect
-	github.com/bkaradzic/go-lz4 v0.0.0-20160924222819-7224d8d8f27e
+	github.com/AudriusButkevicius/pfilter v0.0.10
+	github.com/AudriusButkevicius/recli v0.0.6
+	github.com/alecthomas/kong v0.6.1
 	github.com/calmh/xdr v1.1.0
-	github.com/ccding/go-stun v0.0.0-20180726100737-be486d185f3d
-	github.com/certifi/gocertifi v0.0.0-20190905060710-a5e0173ced67 // indirect
+	github.com/ccding/go-stun v0.1.3
+	github.com/certifi/gocertifi v0.0.0-20210507211836-431795d63e8d // indirect
+	github.com/cespare/xxhash/v2 v2.1.2 // indirect
 	github.com/chmduquesne/rollinghash v0.0.0-20180912150627-a60f8e7142b5
+	github.com/cpuguy83/go-md2man/v2 v2.0.1 // indirect
 	github.com/d4l3k/messagediff v1.2.1
-	github.com/dchest/siphash v1.2.1
-	github.com/dgraph-io/badger/v2 v2.0.3
 	github.com/flynn-archive/go-shlex v0.0.0-20150515145356-3f9db97f8568
+	github.com/fsnotify/fsnotify v1.5.4 // indirect
 	github.com/getsentry/raven-go v0.2.0
-	github.com/go-ldap/ldap/v3 v3.2.0
-	github.com/go-ole/go-ole v1.2.4 // indirect
+	github.com/go-asn1-ber/asn1-ber v1.5.4 // indirect
+	github.com/go-ldap/ldap/v3 v3.4.4
 	github.com/gobwas/glob v0.2.3
-	github.com/gogo/protobuf v1.3.1
-	github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6
-	github.com/greatroar/blobloom v0.3.0
-	github.com/jackpal/gateway v1.0.6
+	github.com/gogo/protobuf v1.3.2
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da
+	github.com/golang/snappy v0.0.4 // indirect
+	github.com/greatroar/blobloom v0.7.0
+	github.com/hashicorp/golang-lru v0.5.4
+	github.com/jackpal/gateway v1.0.7
 	github.com/jackpal/go-nat-pmp v1.0.2
+	github.com/julienschmidt/httprouter v1.3.0
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51
-	github.com/kr/pretty v0.2.0 // indirect
-	github.com/lib/pq v1.2.0
-	github.com/lucas-clemente/quic-go v0.17.3
-	github.com/maruel/panicparse v1.3.0
-	github.com/mattn/go-isatty v0.0.11
-	github.com/minio/sha256-simd v0.1.1
-	github.com/oschwald/geoip2-golang v1.4.0
-	github.com/petermattis/goid v0.0.0-20180202154549-b0b1615b78e5 // indirect
-	github.com/pkg/errors v0.9.1
-	github.com/prometheus/client_golang v1.2.1
-	github.com/rcrowley/go-metrics v0.0.0-20190826022208-cac0b30c2563
-	github.com/sasha-s/go-deadlock v0.2.0
-	github.com/shirou/gopsutil v0.0.0-20190714054239-47ef3260b6bf
-	github.com/syncthing/notify v0.0.0-20190709140112-69c7a957d3e2
-	github.com/syndtr/goleveldb v1.0.1-0.20190923125748-758128399b1d
-	github.com/thejerf/suture v3.0.2+incompatible
-	github.com/urfave/cli v1.22.2
+	github.com/klauspost/cpuid/v2 v2.0.9 // indirect
+	github.com/lib/pq v1.10.3
+	github.com/lucas-clemente/quic-go v0.28.1
+	github.com/maruel/panicparse v1.6.1
+	github.com/maxbrunsfeld/counterfeiter/v6 v6.3.0
+	github.com/minio/sha256-simd v1.0.0
+	github.com/miscreant/miscreant.go v0.0.0-20200214223636-26d376326b75
+	github.com/oschwald/geoip2-golang v1.5.0
+	github.com/pierrec/lz4/v4 v4.1.15
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/prometheus/client_golang v1.12.2
+	github.com/prometheus/common v0.32.1 // indirect
+	github.com/prometheus/procfs v0.7.3 // indirect
+	github.com/rcrowley/go-metrics v0.0.0-20201227073835-cf1acfcdf475
+	github.com/sasha-s/go-deadlock v0.3.1
+	github.com/shirou/gopsutil/v3 v3.22.6
+	github.com/syncthing/notify v0.0.0-20210616190510-c6b7342338d2
+	github.com/syndtr/goleveldb v1.0.1-0.20220721030215-126854af5e6d
+	github.com/thejerf/suture/v4 v4.0.2
+	github.com/urfave/cli v1.22.5
 	github.com/vitrun/qart v0.0.0-20160531060029-bf64b92db6b0
-	golang.org/x/crypto v0.0.0-20200423211502-4bdfaf469ed5
-	golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297
-	golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae
-	golang.org/x/text v0.3.3
-	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4
+	golang.org/x/crypto v0.0.0-20220722155217-630584e8d5aa
+	golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 // indirect
+	golang.org/x/net v0.0.0-20220802222814-0bcc04d9c69b
+	golang.org/x/sys v0.0.0-20220731174439-a90be440212d
+	golang.org/x/text v0.3.7
+	golang.org/x/time v0.0.0-20210723032227-1f47c861a9ac
+	golang.org/x/tools v0.1.12
+	google.golang.org/protobuf v1.27.1
 )

-go 1.13
+require (
+	github.com/Azure/go-ntlmssp v0.0.0-20220621081337-cb9428e4ac1e // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cheekybits/genny v1.0.0 // indirect
+	github.com/go-ole/go-ole v1.2.6 // indirect
+	github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/marten-seemann/qtls-go1-16 v0.1.5 // indirect
+	github.com/marten-seemann/qtls-go1-17 v0.1.2 // indirect
+	github.com/marten-seemann/qtls-go1-18 v0.1.2 // indirect
+	github.com/marten-seemann/qtls-go1-19 v0.1.0 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/nxadm/tail v1.4.8 // indirect
+	github.com/onsi/ginkgo v1.16.5 // indirect
+	github.com/oschwald/maxminddb-golang v1.8.0 // indirect
+	github.com/petermattis/goid v0.0.0-20180202154549-b0b1615b78e5 // indirect
+	github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
+	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/yusufpapurcu/wmi v1.2.2 // indirect
+	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
+)
+
+// https://github.com/gobwas/glob/pull/55
+replace github.com/gobwas/glob v0.2.3 => github.com/calmh/glob v0.0.0-20220615080505-1d823af5017b
--- a/go.sum
+++ b/go.sum
--- a/gui/black/assets/css/theme.css
+++ b/gui/black/assets/css/theme.css
@@ -42,7 +42,7 @@ a:hover,a:focus,a.focus{
 .nav-tabs > li > a:hover,
 .nav-tabs > li > a:focus {
  background-color: #222222 !important;
-  border: none !important;
+  border-color: transparent !important;
 }

 .navbar-text, .dropdown>a, .dropdown-menu>li>a, .hidden-xs>a, .navbar-link {
@@ -265,6 +265,11 @@ code.ng-binding{
    color: #222;
 }

-.fancytree-title {
-    color: #aaa !important;
+/*
+ * Fancytree tweaks
+ */
+
+.fancytree-container tr:hover,
+.fancytree-focused {
+    background-color: #222;
 }
--- a/gui/dark/assets/css/theme.css
+++ b/gui/dark/assets/css/theme.css
@@ -45,7 +45,7 @@ a:hover,a:focus,a.focus{
 .nav-tabs > li > a:hover,
 .nav-tabs > li > a:focus {
  background-color: #424242 !important;
-  border: none !important;
+  border-color: transparent !important;
 }


@@ -277,6 +277,11 @@ code.ng-binding{
    color: #3fa9f0;
 }

-.fancytree-title {
-    color: #aaa !important;
+/*
+ * Fancytree tweaks
+ */
+
+.fancytree-container tr:hover,
+.fancytree-focused {
+    background-color: #424242;
 }
--- a/gui/default/assets/css/overrides.css
+++ b/gui/default/assets/css/overrides.css
@@ -10,6 +10,7 @@
 body {
    padding-bottom: 70px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
+    overflow-y: scroll;
 }

 h1, h2, h3, h4, h5 {
@@ -21,7 +22,7 @@ ul+h5 {
    margin-top: 1.5em;
 }

-#content {
+.content {
    margin-bottom: 50px;
 }

@@ -41,6 +42,12 @@ ul+h5 {
    float: none; /* issue #1197 */
 }

+#advancedAccordion input.form-control[type="checkbox"] {
+    box-shadow: none;
+    margin: 0;
+    width: auto;
+}
+
 .popover {
    max-width: none;
    min-width: 250px;
@@ -114,7 +121,8 @@ table.table-dynamic {
    word-break: break-all;
 }

-table.table-condensed td {
+table.table-condensed td,
+table.table-condensed th {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
@@ -159,16 +167,13 @@ table.table-auto td {
    display: none;
 }

-*[language-select] > .dropdown-menu {
+li[language-select] > .dropdown-menu {
+    column-count: 2;
+    column-gap: 0;
    width: 450px;
 }

-*[language-select] > .dropdown-menu > li {
-    float: left;
-    width: 50%;
-}
-
-*[language-select] > .dropdown-menu > li > a {
+li[language-select] > .dropdown-menu > li > a {
    overflow: hidden;
    text-overflow: ellipsis;
 }
@@ -241,6 +246,7 @@ identicon {
 .identicon {
    width: 1em;
    height: 1em;
+    shape-rendering: crispEdges;
 }

 a.toggler {
@@ -296,6 +302,62 @@ ul.three-columns li, ul.two-columns li {
    z-index: 980;
 }

+/*
+ * Restore Versions tweaks
+ */
+
+#restoreTree-container {
+    overflow-y: scroll;
+    resize: vertical;
+    /* Limit height to prevent vertical screen overflow. */
+    max-height: calc(100vh - 390px);
+    /* Always fit at least one folder with dropdown open. */
+    min-height: 136px;
+}
+@media (min-width: 768px) {
+    #restoreTree-container {
+        max-height: calc(100vh - 401px);
+    }
+}
+@media (min-width: 992px) {
+    #restoreTree-container {
+        max-height: calc(100vh - 333px);
+    }
+}
+
+/* Ignore fixed height when manually resized. */
+#restoreTree-container[style*="height"] {
+    max-height: none;
+}
+
+/* Remove table outline as rows have own focus style already. */
+#restoreTree:focus {
+    outline: 0;
+}
+
+/* Align dropdown with title first line. */
+#restoreTree td + td {
+    padding-top: 4px;
+    vertical-align: top;
+}
+
+/* Reduce space between toggle and menu on mobile. */
+#restoreTree .dropdown-toggle {
+    margin-bottom: 0;
+}
+
+/* Change direction to remain on screen on mobile. */
+#restoreTree .dropdown-menu {
+    left: auto;
+    right: 0;
+}
+
+/* Ensure maximum space for filtering and date range. */
+#restoreVersions .form-group,
+#restoreVersions .form-control {
+    width: 100%;
+}
+
 /** Footer nav on small devices **/
@media (max-width: 1199px) {
    /* Stay at the end of the page, with space reserved for the footer
@@ -343,20 +405,25 @@ ul.three-columns li, ul.two-columns li {
        border-radius: 2px;
    }

-    *[language-select] {
+    li[language-select] {
        position: static !important;
    }

-    *[language-select] > .dropdown-menu {
+    li[language-select] > .dropdown-menu {
+        column-count: auto;
        margin-left: 15px;
        margin-right: 15px;
        margin-top: -12px !important;
        max-width: 450px;
-        height: 265px;
        overflow-y: scroll;
+        /* height of 5.5 elements + negative margin-top */
+        height: 276px;
    }

-    table.table-condensed td {
+    table.table-auto td,
+    table.table-auto th,
+    table.table-condensed td,
+    table.table-condensed th {
        /* for mobile phones to allow linebreaks in long repro folder/shared with
        * columns. */
        white-space: normal;
@@ -388,10 +455,6 @@ ul.three-columns li, ul.two-columns li {
    padding-top: 10px;
 }

-.fancytree-ext-table {
-    width: 100% !important;
-}
-
@media (max-width: 419px) {
    /* the selectors are build to target only the content of folder and device
       panels as it would "destroy" e.g. out of sync or recent changes listings */
@@ -412,11 +475,44 @@ ul.three-columns li, ul.two-columns li {
        width: 100%;
    }

-    /* all buttons, except panel headings, get bottom margin, as they won't fit
-       beside each other anymore */
+    /* All buttons, except panel headings, get bottom margin, as they
+       won't fit beside each other anymore. Reduce footer padding to
+       compensate for the margin. */
    .btn:not(.panel-heading),
-    /* this "+"-selector is needed to override some bootstrap defaults */
    .btn:not(.panel-heading) + .btn:not(.panel-heading) {
-        margin-bottom: 1rem;
+        margin-bottom: 10px;
+    }
+    .panel-footer {
+        padding-bottom: 0;
+    }
+    .modal-footer {
+        padding-bottom: 5px;
    }
 }
+
+.form-horizontal .form-group {
+    margin-bottom: 5px;
+}
+
+.form-horizontal {
+    margin-bottom: 10px;
+}
+
+/* Use the same style as Bootstrap uses for disabled <select>. */
+.form-control option[disabled] {
+    background-color: #eeeeee;
+    opacity: 1;
+}
+
+/* Make a "well" look more like a readonly text input when grouped with a button */
+.input-group .well-sm {
+  padding-top: 6px;
+  padding-bottom: 6px;
+}
+
+/* CJK languages don't use italic at all, hence don't force it on them. */
+html[lang|="zh"] i,
+html[lang="ja"] i,
+html[lang|="ko"] i {
+    font-style: normal;
+}
--- a/gui/default/assets/css/tree.css
+++ b/gui/default/assets/css/tree.css
@@ -0,0 +1,58 @@
+/*
+// Copyright (C) 2021 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+*/
+
+.fancytree-container {
+    cursor: pointer;
+    width: 100%;
+}
+
+.fancytree-hide {
+    visibility: collapse;
+}
+
+/* Node needs to be block, and expander, icon and title
+   inline-block to properly wrap unbreakable text. */
+.fancytree-node {
+    display: block;
+    white-space: nowrap;
+    /* expander 16px + icon 16px + title padding 8px */
+    padding-right: 40px;
+}
+.fancytree-expander,
+.fancytree-icon,
+.fancytree-title {
+    display: inline-block;
+}
+
+.fancytree-expander,
+.fancytree-icon {
+    margin-top: 4px;
+    vertical-align: top;
+    width: 16px;
+}
+
+.fancytree-childcounter {
+    background: #777;
+    border-radius: 10px;
+    border: 1px solid gray;
+    color: #fff;
+    font-size: 13px;
+    opacity: .75;
+    padding: 2px 3px;
+    position: relative;
+    right: 8px;
+    top: -9px;
+    user-select: none;
+}
+
+.fancytree-title {
+    padding-left: 8px;
+    white-space: normal;
+    word-break: break-all;
+}
--- a/gui/default/assets/lang/lang-bg.json
+++ b/gui/default/assets/lang/lang-bg.json
@@ -1,375 +1,462 @@
 {
-    "A device with that ID is already added.": "Устройство с този идентификатор е вече добавено.",
-    "A negative number of days doesn't make sense.": "Няма логика в задаването на отрицателен брой дни.",
-    "A new major version may not be compatible with previous versions.": "Нова основна версия, която може да не е съвместима с предишни версии.",
-    "API Key": "API Ключ",
-    "About": "За програмата",
+    "A device with that ID is already added.": "Устройство с този идентификатор вече е добавено.",
+    "A negative number of days doesn't make sense.": "Отрицателният брой дни е безсмислен.",
+    "A new major version may not be compatible with previous versions.": "Ново значимо издание, което може да е несъвместимо с предните издания.",
+    "API Key": "Ключ за ППИ",
+    "About": "Относно",
    "Action": "Действие",
-    "Actions": "Меню",
-    "Add": "Добави",
-    "Add Device": "Добави устройство",
-    "Add Folder": "Добави папка",
-    "Add Remote Device": "Добави ново устройство",
-    "Add devices from the introducer to our device list, for mutually shared folders.": "Добавяне на нови устройства през устройства предлагащи други устройства, за взаимно споделени папки.",
-    "Add new folder?": "Добави нова папка?",
-    "Additionally the full rescan interval will be increased (times 60, i.e. new default of 1h). You can also configure it manually for every folder later after choosing No.": "Също така интервалът за повторно сканиране ще бъде увеличен (60 пъти, пр. новият интервал бъде 1ч). Освен това може да го зададете и ръчно за всяка папка след като изберете Не.",
+    "Actions": "Действия",
+    "Add": "Добавяне",
+    "Add Device": "Добавяне на устройство",
+    "Add Folder": "Добавяне на папка",
+    "Add Remote Device": "Добавяне на устройство",
+    "Add devices from the introducer to our device list, for mutually shared folders.": "Добавяйте устройства през поръчителите за взаимно споделени папки.",
+    "Add ignore patterns": "Добавяне на шаблони за пренебрегване",
+    "Add new folder?": "Добавяне на тази папка?",
+    "Additionally the full rescan interval will be increased (times 60, i.e. new default of 1h). You can also configure it manually for every folder later after choosing No.": "Също така интервалът за повторно обхождане ще бъде увеличен (60 пъти, пр. новият интервал бъде 1ч). Освен това може да го зададете и ръчно за всяка папка след като изберете Не.",
    "Address": "Адрес",
    "Addresses": "Адреси",
-    "Advanced": "Допълнителни",
-    "Advanced Configuration": "Допълнителни настройки",
+    "Advanced": "Разширени",
+    "Advanced Configuration": "Разширени настройки",
    "All Data": "Всички данни",
-    "Allow Anonymous Usage Reporting?": "Разрешаване изпращането на анонимни статистически данни?",
+    "All Time": "През цялото време",
+    "All folders shared with this device must be protected by a password, such that all sent data is unreadable without the given password.": "Всички папки, споделени с устройството трябва да бъдат защитени с парола, така че данните да са недостъпни без нея.",
+    "Allow Anonymous Usage Reporting?": "Разрешаване на анонимното отчитане на употребата?",
    "Allowed Networks": "Разрешени мрежи",
    "Alphabetic": "Азбучен ред",
-    "An external command handles the versioning. It has to remove the file from the shared folder. If the path to the application contains spaces, it should be quoted.": "Външна команда се занимава с версиите. Тази команда трябва да премахне файла от синхронизираната папка. Ако пътят до това приложение използва интервали, то той трябва да бъде заграден в кавички.",
-    "Anonymous Usage Reporting": "Анонимен доклад",
-    "Anonymous usage report format has changed. Would you like to move to the new format?": "Форматът на анонимния доклад е променен. Желаете ли да преминете към новия формат?",
-    "Are you sure you want to remove device {%name%}?": "Сигурни ли сте, че искате да премахнете устройството {{name}}?",
-    "Are you sure you want to remove folder {%label%}?": "Сигурни ли сте, че искате да премахнете папката {{label}}?",
-    "Are you sure you want to restore {%count%} files?": "Сигурни ли сте, че искате да възстановите файла {{count}}?",
-    "Are you sure you want to upgrade?": "Are you sure you want to upgrade?",
+    "Altered by ignoring deletes.": "Пренебрегнати са премахнати файлове.",
+    "An external command handles the versioning. It has to remove the file from the shared folder. If the path to the application contains spaces, it should be quoted.": "Външна команда управлява версиите. Тя трябва да премахне файла от синхронизираната папка. Ако в пътя до приложението има интервали, то той трябва да бъде поставен в кавички.",
+    "Anonymous Usage Reporting": "Анонимно отчитане на употреба",
+    "Anonymous usage report format has changed. Would you like to move to the new format?": "Форматът на данните за анонимно отчитане на употреба е променен. Желаете ли да използвате него вместо стария?",
+    "Apply": "Прилагане",
+    "Are you sure you want to override all remote changes?": "Сигурни ли сте, че желаете да отмените всички промени, направени отдалечено?",
+    "Are you sure you want to permanently delete all these files?": "Сигурни ли сте, че желаете всички тези файлове да бъдат безвъзвратно премахнати?",
+    "Are you sure you want to remove device {%name%}?": "Сигурни ли сте, че желаете устройството {{name}} да бъде премахнато?",
+    "Are you sure you want to remove folder {%label%}?": "Сигурни ли сте, че желаете папката {{label}} да бъде премахната?",
+    "Are you sure you want to restore {%count%} files?": "Сигурни ли сте, че желаете {{count}} файла да бъдат възстановени?",
+    "Are you sure you want to revert all local changes?": "Сигурни ли сте, че желаете всички местни промени да бъдат отменени?",
+    "Are you sure you want to upgrade?": "Желаете ли приложението да бъде обновено?",
    "Auto Accept": "Автоматично приемане",
-    "Automatic Crash Reporting": "Automatic Crash Reporting",
-    "Automatic upgrade now offers the choice between stable releases and release candidates.": "Автоматичното обновяване вече предлага избор между стабилни версии и кандидат версии.",
+    "Automatic Crash Reporting": "Автоматично изпращане на доклад за срив",
+    "Automatic upgrade now offers the choice between stable releases and release candidates.": "Автоматичното обновяване вече предлага избор между стабилни и предварителни издания.",
    "Automatic upgrades": "Автоматично обновяване",
-    "Automatic upgrades are always enabled for candidate releases.": "Automatic upgrades are always enabled for candidate releases.",
-    "Automatically create or share folders that this device advertises at the default path.": "Автоматично създаване или споделяне на папки, които това устройство предлага в пътя по подразбиране.",
-    "Available debug logging facilities:": "Дебъгинг функционалност на разположение:",
+    "Automatic upgrades are always enabled for candidate releases.": "Автоматичното обновяване е винаги включено за предварителните издания.",
+    "Automatically create or share folders that this device advertises at the default path.": "Автоматично създава в подразбираната папка или споделя папките, които устройството предлага.",
+    "Available debug logging facilities:": "Достъпни улеснения при отстраняване на дефекти:",
    "Be careful!": "Внимание!",
-    "Bugs": "Бъгове",
-    "Changelog": "Списък с промени",
-    "Clean out after": "Изчисти след",
-    "Click to see discovery failures": "Натиснете, за да видите грешки при откриването",
-    "Close": "Затвори",
+    "Bugs": "Дефекти",
+    "Cancel": "Отказ",
+    "Changelog": "Дневник на промените",
+    "Clean out after": "Почистване след",
+    "Cleaning Versions": "Почистване на версии",
+    "Cleanup Interval": "Интервал на почистване",
+    "Click to see full identification string and QR code.": "Преглед на идентификатор и код за QR.",
+    "Close": "Затваряне",
    "Command": "Команда",
-    "Comment, when used at the start of a line": "Коментар, използван в началото на реда",
+    "Comment, when used at the start of a line": "Коментар, когато се използва в началото на реда",
    "Compression": "Компресиране",
    "Configured": "Настроен",
-    "Connected (Unused)": "Connected (Unused)",
-    "Connection Error": "Грешка при свързването",
-    "Connection Type": "Вид връзка",
+    "Connected (Unused)": "Свързано (неизползвано)",
+    "Connection Error": "Грешка при осъществяване на връзка",
+    "Connection Type": "Вид на връзката",
    "Connections": "Връзки",
-    "Continuously watching for changes is now available within Syncthing. This will detect changes on disk and issue a scan on only the modified paths. The benefits are that changes are propagated quicker and that less full scans are required.": "Постоянния мониторинг за промени вече е част от Syncthing. При промени по файловете се стартира сканиране само за променените папки. Ползите са, че промените биват синхронизирани по-бързо, без да се изисква цялостно сканирания на папките.",
-    "Copied from elsewhere": "Копиране от някъде другаде",
-    "Copied from original": "Копиран от оригинала",
-    "Copyright © 2014-2019 the following Contributors:": "Copyright © 2014-2019 the following Contributors:",
-    "Creating ignore patterns, overwriting an existing file at {%path%}.": "Създаване на шаблони за игнориране, презаписване на съществуващ файл в {{path}}.",
-    "Currently Shared With Devices": "Currently Shared With Devices",
+    "Continuously watching for changes is now available within Syncthing. This will detect changes on disk and issue a scan on only the modified paths. The benefits are that changes are propagated quicker and that less full scans are required.": "Syncthing вече разполага с постоянно наблюдение за промени. Така се отчитат промените на дисковото устройство и се обхождат само повлияните папки. Ползите са, че промените се разпространяват по-бързо и с по-малко на брой пълни обхождания.",
+    "Copied from elsewhere": "Копирано от другаде",
+    "Copied from original": "Копирано от източника",
+    "Currently Shared With Devices": "Устройства, с които е споделена",
+    "Custom Range": "В периода",
    "Danger!": "Опасност!",
-    "Debugging Facilities": "Дебъг функционалност",
-    "Default Folder Path": "Път до папка по подразбиране",
-    "Deleted": "Изтрито",
-    "Deselect All": "Никое",
-    "Deselect devices to stop sharing this folder with.": "Deselect devices to stop sharing this folder with.",
+    "Debugging Facilities": "Отстраняване на дефекти",
+    "Default Configuration": "Настройки по подразбиране",
+    "Default Device": "Устройство по подразбиране",
+    "Default Folder": "Папка по подразбиране",
+    "Default Ignore Patterns": "Подразбирани шаблони за пренебрегване",
+    "Defaults": "Подразбирани",
+    "Delete": "Изтрий",
+    "Delete Unexpected Items": "Премахване на неочакваните",
+    "Deleted {%file%}": "{{file}} премахнат",
+    "Deselect All": "Изчистване",
+    "Deselect devices to stop sharing this folder with.": "Махнете отметката от устройство, за да спрете споделяне с него.",
+    "Deselect folders to stop sharing with this device.": "Махнете отметката пред папката, за да спрете споделянето ѝ с устройството.",
    "Device": "Устройство",
    "Device \"{%name%}\" ({%device%} at {%address%}) wants to connect. Add new device?": "Устройство \"{{name}}\" ({{device}}) с адрес {{address}} желае да се свърже. Да бъде ли добавено?",
    "Device ID": "Идентификатор на устройство",
-    "Device Identification": "Идентификатор на устройството",
+    "Device Identification": "Идентификатор на устройство",
    "Device Name": "Име на устройството",
-    "Device rate limits": "Device rate limits",
+    "Device is untrusted, enter encryption password": "Устройството е недоверено, въведете парола за шифроване",
+    "Device rate limits": "Ограничаване на скоростта",
    "Device that last modified the item": "Устройство, което последно промени обекта",
    "Devices": "Устройства",
-    "Disable Crash Reporting": "Disable Crash Reporting",
-    "Disabled": "Деактивирано",
-    "Disabled periodic scanning and disabled watching for changes": "Периодичните сканирания и наблюденията за промяна са деактивирани.",
-    "Disabled periodic scanning and enabled watching for changes": "Периодичните сканирания са деактивирани , а наблюденията за промяна са активирани.",
-    "Disabled periodic scanning and failed setting up watching for changes, retrying every 1m:": "Периодичните сканирания са деактивирани и задаването на наблюдение за промени е неуспешно, ще опита пак след 1мин:",
-    "Disables comparing and syncing file permissions. Useful on systems with nonexistent or custom permissions (e.g. FAT, exFAT, Synology, Android).": "Disables comparing and syncing file permissions. Useful on systems with nonexistent or custom permissions (e.g. FAT, exFAT, Synology, Android).",
-    "Discard": "Discard",
+    "Disable Crash Reporting": "Изключване на доклада за срив",
+    "Disabled": "Изключено",
+    "Disabled periodic scanning and disabled watching for changes": "Изключено периодично обхождане и изключено наблюдение за промени",
+    "Disabled periodic scanning and enabled watching for changes": "Изключено периодично обхождане и включено наблюдение за промени",
+    "Disabled periodic scanning and failed setting up watching for changes, retrying every 1m:": "Изключено периодично обхождане и грешка при започване на наблюдението за промени, прави се опит всяка минута:",
+    "Disables comparing and syncing file permissions. Useful on systems with nonexistent or custom permissions (e.g. FAT, exFAT, Synology, Android).": "Изключва сравняването и синхронизацията на правата на файловете. Полезно за системи с липсващи или специфични права (като FAT, exFAT, Synology, Android).",
+    "Discard": "Отказване",
    "Disconnected": "Не е свързано",
-    "Disconnected (Unused)": "Disconnected (Unused)",
+    "Disconnected (Unused)": "Не е свързано (неизползвано)",
    "Discovered": "Открит",
    "Discovery": "Откриване",
-    "Discovery Failures": "Грешка в откриването",
-    "Do not restore": "Не възстановявай",
-    "Do not restore all": "Не възстановявай всички",
-    "Do you want to enable watching for changes for all your folders?": "Желаете ли да активирате наблюдението за промени на всички папки?",
+    "Discovery Failures": "Грешка при откриване",
+    "Discovery Status": "Състояние на откриване",
+    "Dismiss": "Отхвърляне",
+    "Do not add it to the ignore list, so this notification may recur.": "Да не бъде добавяна в списъка за пренебрегване, така че да има повторно запитване.",
+    "Do not restore": "Без възстановяване",
+    "Do not restore all": "Без възстановяване всички",
+    "Do you want to enable watching for changes for all your folders?": "Желаете ли да наблюдението за промени да бъде включено за всички папки?",
    "Documentation": "Документация",
-    "Download Rate": "Скорост на сваляне",
-    "Downloaded": "Изтеглен",
+    "Download Rate": "Скорост на изтегляне",
+    "Downloaded": "Изтеглено",
    "Downloading": "Изтегляне",
-    "Edit": "Промени",
+    "Edit": "Редактиране",
+    "Edit Device": "Промяна на устройство",
+    "Edit Device Defaults": "За нови устройства",
+    "Edit Folder": "Промяна на папка",
+    "Edit Folder Defaults": "За нови папки",
    "Editing {%path%}.": "Променяне на {{path}}.",
-    "Enable Crash Reporting": "Enable Crash Reporting",
-    "Enable NAT traversal": "Разреши NAT traversal",
-    "Enable Relaying": "Разреши препращане",
-    "Enabled": "Активирано",
-    "Enter a non-negative number (e.g., \"2.35\") and select a unit. Percentages are as part of the total disk size.": "Въведете не отрицателно число (пр. \"2.35\") и изберете единица.\nПроцентите са като част от размера на цялото дисково пространство.",
-    "Enter a non-privileged port number (1024 - 65535).": "Въведете непривилегирован номер на порт (1024-65535).",
-    "Enter comma separated (\"tcp://ip:port\", \"tcp://host:port\") addresses or \"dynamic\" to perform automatic discovery of the address.": "Въведете адреси разделени със запетая (\"tcp://ip:port\", \"tcp://host:port\") или \"dynamic\", за автоматично откриване на наличните адреси.",
-    "Enter ignore patterns, one per line.": "Добавете шаблони за игнориране, по един на ред.",
-    "Enter up to three octal digits.": "Enter up to three octal digits.",
+    "Enable Crash Reporting": "Включване на доклад за срив",
+    "Enable NAT traversal": "Преминаване през NAT",
+    "Enable Relaying": "Ретранслация",
+    "Enabled": "Включено",
+    "Enter a non-negative number (e.g., \"2.35\") and select a unit. Percentages are as part of the total disk size.": "Въведете положително число (например „3.14“) и изберете единица мярка. Процентите са части от цялото дисково пространство.",
+    "Enter a non-privileged port number (1024 - 65535).": "Въведете номер на непривилегирован порт (1024-65535).",
+    "Enter comma separated (\"tcp://ip:port\", \"tcp://host:port\") addresses or \"dynamic\" to perform automatic discovery of the address.": "Въведете адреси, разделени със запетая („tcp://ip:port“, „tcp://host:port“) или „dynamic“, за автоматично откриване на наличните адреси.",
+    "Enter ignore patterns, one per line.": "Въведете шаблони за пренебрегване, по един на ред.",
+    "Enter up to three octal digits.": "Въведете до три осмични цифри.",
    "Error": "Грешка",
-    "External File Versioning": "Външно управление на версиите",
-    "Failed Items": "Неуспешни",
-    "Failed to setup, retrying": "Неуспешно конфигуриране, правенe на повторен опит",
-    "Failure to connect to IPv6 servers is expected if there is no IPv6 connectivity.": "Неуспешна връзка към IPv6 сървъри може да се очаква ако няма IPv6 свързаност.",
-    "File Pull Order": "Ред на сваляне",
+    "External": "Външни",
+    "External File Versioning": "Външно управление на версии",
+    "Failed Items": "Елементи с грешка",
+    "Failed to load file versions.": "Грешка при зареждане на версии.",
+    "Failed to load ignore patterns.": "Грешка при зареждане на шаблони за пренебрегване.",
+    "Failed to setup, retrying": "Грешка при настройване, извършва се повторен опит",
+    "Failure to connect to IPv6 servers is expected if there is no IPv6 connectivity.": "Неуспешна връзка към сървъри по IPv6 може да се очаква ако няма свързаност по IPv6.",
+    "File Pull Order": "Ред на изтегляне",
    "File Versioning": "Версии на файловете",
-    "Files are moved to .stversions directory when replaced or deleted by Syncthing.": "Файловете биват преместени в .stversions папка, когато са заменени или изтрити от Syncthing.",
-    "Files are moved to date stamped versions in a .stversions directory when replaced or deleted by Syncthing.": "Когато Syncthing замени или изтрие файл той бива преместен в папката .stversions и преименуван - с добавяне на дата и час.",
-    "Files are protected from changes made on other devices, but changes made on this device will be sent to the rest of the cluster.": "Защитава локалните файловете от промени направени на други устройства, но промените направени на това устройство ще бъдат синхронизирани с останалите устройства.",
-    "Files are synchronized from the cluster, but any changes made locally will not be sent to other devices.": "Промените направени на други устройства ще бъдат прилагани локално, но локалните промени няма да бъдат синхронизирани с останалите устройства.",
-    "Filesystem Watcher Errors": "Filesystem Watcher Errors",
+    "Files are moved to .stversions directory when replaced or deleted by Syncthing.": "Файловете биват преместени в папка .stversions при заменяне или изтриване от Syncthing.",
+    "Files are moved to date stamped versions in a .stversions directory when replaced or deleted by Syncthing.": "Когато Syncthing замени или изтрие файл той бива преместен в папката .stversions и преименуван чрез добавяне на датата и часа.",
+    "Files are protected from changes made on other devices, but changes made on this device will be sent to the rest of the cluster.": "Предпазва местните файлове от промени, идващи от другите устройства, но местните промени се изпращат.",
+    "Files are synchronized from the cluster, but any changes made locally will not be sent to other devices.": "Файловете се синхронизират от другите устройства, но местните промени не се изпращат.",
+    "Filesystem Watcher Errors": "Грешка при наблюдаване на файловата система",
    "Filter by date": "Филтриране по дата",
    "Filter by name": "Филтриране по име",
    "Folder": "Папка",
    "Folder ID": "Идентификатор на папката",
    "Folder Label": "Име на папката",
    "Folder Path": "Път до папката",
-    "Folder Type": "Вид папка",
+    "Folder Type": "Вид на папката",
+    "Folder type \"{%receiveEncrypted%}\" can only be set when adding a new folder.": "Вида „{{receiveEncrypted}}“ може да бъде избран само при добавяне на папка.",
+    "Folder type \"{%receiveEncrypted%}\" cannot be changed after adding the folder. You need to remove the folder, delete or decrypt the data on disk, and add the folder again.": "Видът папката „{{receiveEncrypted}}“ не може да бъде променян след нейното създаване. Трябва да я премахнете, изтриете или разшифровате съдържанието и да добавите папката отново.",
    "Folders": "Папки",
-    "For the following folders an error occurred while starting to watch for changes. It will be retried every minute, so the errors might go away soon. If they persist, try to fix the underlying issue and ask for help if you can't.": "For the following folders an error occurred while starting to watch for changes. It will be retried every minute, so the errors might go away soon. If they persist, try to fix the underlying issue and ask for help if you can't.",
-    "Full Rescan Interval (s)": "Интервал(и) за периодичното сканиране",
-    "GUI": "Потребителски интерфейс",
+    "For the following folders an error occurred while starting to watch for changes. It will be retried every minute, so the errors might go away soon. If they persist, try to fix the underlying issue and ask for help if you can't.": "Грешка при започване на наблюдението за промени на следните папки. Всяка минута ще бъде извършван нов опит, така че грешката скоро може да изчезне. Ако все пак не изчезне, отстранете нейната първопричина или потърсете помощ ако не съумявате.",
+    "Forever": "Завинаги",
+    "Full Rescan Interval (s)": "Интервал на пълно обхождане (секунди)",
+    "GUI": "Графичен интерфейс",
    "GUI Authentication Password": "Парола за интерфейса",
    "GUI Authentication User": "Потребител за интерфейса",
-    "GUI Authentication: Set User and Password": "GUI Authentication: Set User and Password",
-    "GUI Listen Address": "Адрес на слушане на GUI-то",
-    "GUI Theme": "Тема за потребителския интерфейс",
+    "GUI Authentication: Set User and Password": "Удостоверяване на графичния интерфейс: потребител и парола",
+    "GUI Listen Address": "Адрес на слушане",
+    "GUI Theme": "Тема на графичния интерфейс",
    "General": "Общи",
-    "Generate": "Генерирай",
+    "Generate": "Подновяване",
    "Global Discovery": "Глобално откриване",
    "Global Discovery Servers": "Сървъри за глобално откриване",
    "Global State": "Глобално състояние",
    "Help": "Помощ",
-    "Home page": "Начална страница",
-    "However, your current settings indicate you might not want it enabled. We have disabled automatic crash reporting for you.": "However, your current settings indicate you might not want it enabled. We have disabled automatic crash reporting for you.",
-    "If you want to prevent other users on this computer from accessing Syncthing and through it your files, consider setting up authentication.": "If you want to prevent other users on this computer from accessing Syncthing and through it your files, consider setting up authentication.",
-    "Ignore": "Игнорирай",
-    "Ignore Patterns": "Шаблони за игнориране",
-    "Ignore Permissions": "Игнорирай правата за достъп",
-    "Ignored Devices": "Игнорирани устройства",
-    "Ignored Folders": "Игнорирани папки",
-    "Ignored at": "Ignored at",
-    "Incoming Rate Limit (KiB/s)": "Лимит на скоростта за сваляне (KiB/s)",
+    "Home page": "Страница",
+    "However, your current settings indicate you might not want it enabled. We have disabled automatic crash reporting for you.": "Текущите настройки обаче показват, че може би не искате да бъде включена. За това автоматичното докладване на сривове е изключено.",
+    "Identification": "Идентификация",
+    "If untrusted, enter encryption password": "При недоверено задайте парола за шифроване",
+    "If you want to prevent other users on this computer from accessing Syncthing and through it your files, consider setting up authentication.": "Ако желаете да предотвратите достъпа на другите потребители на устройството до Syncthing, а чрез него и до файловете ви, помислете за удостоверяване на графичния интерфейс.",
+    "Ignore": "Пренебрегване",
+    "Ignore Patterns": "Шаблони за пренебрегване",
+    "Ignore Permissions": "Пренебрегване на права",
+    "Ignore patterns can only be added after the folder is created. If checked, an input field to enter ignore patterns will be presented after saving.": "Шаблони за пренебрегване могат да бъдат добавяни след като папката бъде създадена. Ако е отметнато, след запазване ще бъде показано текстово поле за шаблоните.",
+    "Ignored Devices": "Пренебрегнати устройства",
+    "Ignored Folders": "Пренебрегнати папки",
+    "Ignored at": "Пренебрегнато на",
+    "Incoming Rate Limit (KiB/s)": "Ограничение при изтегляне (KiB/s)",
    "Incorrect configuration may damage your folder contents and render Syncthing inoperable.": "Неправилни настройки могат да повредят файлове и да попречат на синхронизирането.",
    "Introduced By": "Предложено от",
-    "Introducer": "Може да предлага други устройства",
-    "Inversion of the given condition (i.e. do not exclude)": "Обратното на даденото условие (пр. не изключвай)",
-    "Keep Versions": "Пази версии",
+    "Introducer": "Поръчител",
+    "Inversion of the given condition (i.e. do not exclude)": "Обръща значението на условието (напр. да не се отхвърля)",
+    "Keep Versions": "Пазени версии",
    "LDAP": "LDAP",
-    "Largest First": " Първо най-големите",
-    "Last Scan": "Последно сканирана",
+    "Largest First": " Първо най-големи",
+    "Last 30 Days": "Последните 30 дена",
+    "Last 7 Days": "Последните 7 дена",
+    "Last Month": "Миналия месец",
+    "Last Scan": "Последно обхождане",
    "Last seen": "Последно видяно",
    "Latest Change": "Последна промяна",
    "Learn more": "Научете повече",
-    "Limit": "Limit",
-    "Listeners": "Синхронизиращи устройства",
+    "Limit": "Ограничение",
+    "Listener Failures": "Грешки при очакване на връзка",
+    "Listener Status": "Очакване на връзка",
+    "Listeners": "Очакване на връзка",
    "Loading data...": "Зареждане на информация...",
    "Loading...": "Зареждане...",
-    "Local Additions": "Local Additions",
-    "Local Discovery": "Локално откриване",
-    "Local State": "Локално състояние",
-    "Local State (Total)": "Локално състояние (общо)",
-    "Locally Changed Items": "Locally Changed Items",
-    "Log": "Доклад",
-    "Log tailing paused. Scroll to the bottom to continue.": "Log tailing paused. Scroll to the bottom to continue.",
-    "Logs": "Доклади",
-    "Major Upgrade": "Основно Обновяване",
-    "Mass actions": "Действия за всички",
+    "Local Additions": "Местно добавени",
+    "Local Discovery": "Месно откриване",
+    "Local State": "Местно състояние",
+    "Local State (Total)": "Местно състояние (общо)",
+    "Locally Changed Items": "Местно променени",
+    "Log": "Дневник",
+    "Log tailing paused. Scroll to the bottom to continue.": "Добавяне на редове към дневника е спряно. Плъзнете най-долу за да продължи.",
+    "Logs": "Дневници",
+    "Major Upgrade": "Обновяване на значимо издание",
+    "Mass actions": "Мащабни действия",
    "Maximum Age": "Максимална възраст",
    "Metadata Only": "Само мета информация",
    "Minimum Free Disk Space": "Минимално свободно дисково пространство",
    "Mod. Device": "Променящо устройство",
    "Mod. Time": "Дата на промяна",
-    "Move to top of queue": "Премести в началото на опашката",
-    "Multi level wildcard (matches multiple directory levels)": "Маска на много нива (покрива папки с много нива)",
+    "Move to top of queue": "Премества най-отпред на опашката",
+    "Multi level wildcard (matches multiple directory levels)": "Заместващ символ за няколко нива (съвпада с папки, вложени на няколко нива)",
    "Never": "никога",
    "New Device": "Ново устройство",
    "New Folder": "Нова папка",
-    "Newest First": "Първо най-новите",
+    "Newest First": "Първо най-нови",
    "No": "Не",
-    "No File Versioning": "Без версии",
-    "No files will be deleted as a result of this operation.": "Няма да бъдат изтрити файлове като резултат от тази операция.",
-    "No upgrades": "Няма обновления",
+    "No File Versioning": "Без пазене на версии",
+    "No files will be deleted as a result of this operation.": "В резултат на операцията няма да бъдат премахнати файлове.",
+    "No upgrades": "Без обновяване",
+    "Not shared": "Не споделена",
    "Notice": "Известие",
-    "OK": "ОК",
+    "OK": "Добре",
    "Off": "Изключено",
-    "Oldest First": "Първо най-старите",
+    "Oldest First": "Първо най-стари",
    "Optional descriptive label for the folder. Can be different on each device.": "Незадължително име на папката. Може да бъде различно на всяко устройство.",
    "Options": "Настройки",
    "Out of Sync": "Несинхронизирано",
    "Out of Sync Items": "Несинхронизирани елементи",
-    "Outgoing Rate Limit (KiB/s)": "Лимит на скорост за качване (KiB/s)",
-    "Override Changes": "Наложи локалните промени",
+    "Outgoing Rate Limit (KiB/s)": "Ограничение при качване (KiB/s)",
+    "Override": "Налагане",
+    "Override Changes": "Налагане на местни промени",
    "Path": "Път",
-    "Path to the folder on the local computer. Will be created if it does not exist. The tilde character (~) can be used as a shortcut for": "Път до папката на това устройство. Ако не съществува ще бъде създадена. Символът тилда (~) може да бъде използван като заместител на",
-    "Path where new auto accepted folders will be created, as well as the default suggested path when adding new folders via the UI. Tilde character (~) expands to {%tilde%}.": "Къде да бъдат създавани, автоматично приети папки, както и предложението за път, при добавяне на нови папки от потребителският интерфейс. Символът тилда (~) ще бъде заменян с {{tilde}}.",
-    "Path where versions should be stored (leave empty for the default .stversions directory in the shared folder).": "Пътят, където версиите да бъдат складирани (оставете празно за папката .stversions).",
+    "Path to the folder on the local computer. Will be created if it does not exist. The tilde character (~) can be used as a shortcut for": "Път до папката на това устройство. Ако не съществува ще бъде създадена. Символът тилда (~) може да бъде използван вместо",
+    "Path where versions should be stored (leave empty for the default .stversions directory in the shared folder).": "Папка, в която да бъдат запазвани версиите (оставете празно за подразбираната директория .stversions в споделената папка).",
    "Pause": "Пауза",
    "Pause All": "Пауза на всички",
    "Paused": "На пауза",
-    "Paused (Unused)": "Paused (Unused)",
-    "Pending changes": "Pending changes",
-    "Periodic scanning at given interval and disabled watching for changes": "Периодично сканиране, през определен интервал, без мониторинг за промени",
-    "Periodic scanning at given interval and enabled watching for changes": "Периодично сканиране, през определен интервал, и мониторинг за промени",
-    "Periodic scanning at given interval and failed setting up watching for changes, retrying every 1m:": "Периодично сканиране, през определен интервал, мониторинга за промени не може да стартира. Всяка минута минута се прави опит за стартиране:",
-    "Permissions": "Права за достъп",
-    "Please consult the release notes before performing a major upgrade.": "Моля прочети бележките по обновяването преди да започнеш.",
-    "Please set a GUI Authentication User and Password in the Settings dialog.": "Моля задайте потребителско име и парола за потребителския интерфейс в секцията Настройки.",
-    "Please wait": "Моля изчакайте",
-    "Prefix indicating that the file can be deleted if preventing directory removal": "Представка, която индикира, че файлът може да бъде изтрит ако пречи на премахването на папка",
-    "Prefix indicating that the pattern should be matched without case sensitivity": "Представка, която индикира, че шаблона няма да прави разлика между главни/малки букви",
-    "Preparing to Sync": "Preparing to Sync",
+    "Paused (Unused)": "На пауза (неизползвано)",
+    "Pending changes": "Незапазени промени",
+    "Periodic scanning at given interval and disabled watching for changes": "Периодично обхождане без наблюдение за промени",
+    "Periodic scanning at given interval and enabled watching for changes": "Периодично обхождане и наблюдение за промени",
+    "Periodic scanning at given interval and failed setting up watching for changes, retrying every 1m:": "Периодично обхождане и грешка при започване на наблюдението за промени, прави се опит всяка минута.",
+    "Permanently add it to the ignore list, suppressing further notifications.": "Добавяне за постоянно в списъка с пренебрегнати елементи, потискайки бъдещи известия.",
+    "Please consult the release notes before performing a major upgrade.": "Прочетете бележките по изданието преди да пристъпите към обновяване към значимо издание.",
+    "Please set a GUI Authentication User and Password in the Settings dialog.": "Задайте потребителско име и парола за графичния интерфейс в настройките.",
+    "Please wait": "Изчакайте",
+    "Prefix indicating that the file can be deleted if preventing directory removal": "Представка, указваща че файлът може да бъде изтрит ако пречи при премахване на папката",
+    "Prefix indicating that the pattern should be matched without case sensitivity": "Представка, указваща че шаблонът не прави разлика в регистъра на буквите",
+    "Preparing to Sync": "Подготовка за синхронизация",
    "Preview": "Преглед",
-    "Preview Usage Report": "Преглед на статистиката",
-    "Quick guide to supported patterns": "Бърз наръчник към поддържаните шаблони",
+    "Preview Usage Report": "Преглед на отчет за употреба",
+    "Quick guide to supported patterns": "Кратък наръчник на поддържаните шаблони",
    "Random": "Произволен",
-    "Receive Only": "Само получаване",
+    "Receive Encrypted": "Приема шифровани данни",
+    "Receive Only": "Само получава",
+    "Received data is already encrypted": "Получените данни вече са шифровани",
    "Recent Changes": "Последни промени",
-    "Reduced by ignore patterns": "Намалено посредством шаблон за игнориране",
-    "Release Notes": "Бележки по обновяването",
-    "Release candidates contain the latest features and fixes. They are similar to the traditional bi-weekly Syncthing releases.": "Кандидат версиите съдържат най-новата функционалност и поправки. Те са близки до традиционните дву-седмични Synchthing обновления.",
-    "Remote Devices": "Устройства",
-    "Remove": "Премахни",
+    "Reduced by ignore patterns": "Наложени са шаблони за пренебрегване",
+    "Release Notes": "Бележки по изданието",
+    "Release candidates contain the latest features and fixes. They are similar to the traditional bi-weekly Syncthing releases.": "Предварителните издания съдържат най-новите възможности и поправки. Те са близки до традиционните, два пъти в седмицата, издания на Synchthing.",
+    "Remote Devices": "Отдалечени устройства",
+    "Remote GUI": "Отдалечен графичен интерфейс",
+    "Remove": "Премахване",
    "Remove Device": "Премахване на устройство",
    "Remove Folder": "Премахване на папка",
-    "Required identifier for the folder. Must be the same on all cluster devices.": "Задължителен идентификатор за папката. Трябва да бъде един и същ на всяко устройство.",
-    "Rescan": "Сканирай",
-    "Rescan All": "Сканирай всички",
-    "Rescans": "Повторни сканирания",
-    "Restart": "Рестартирай",
+    "Required identifier for the folder. Must be the same on all cluster devices.": "Задължителен идентификатор на папката. Трябва е еднакъв на всички устройства.",
+    "Rescan": "Обхождане",
+    "Rescan All": "Обхождане всички",
+    "Rescans": "Обхождане",
+    "Restart": "Рестартиране",
    "Restart Needed": "Изисква се рестартиране",
    "Restarting": "Рестартиране",
    "Restore": "Възстановяване",
    "Restore Versions": "Възстановяване на версии",
-    "Resume": "Пусни",
-    "Resume All": "Пусни всички",
-    "Reused": "Повторно използван",
-    "Revert Local Changes": "Revert Local Changes",
-    "Save": "Запази",
-    "Scan Time Remaining": "Оставащо време за сканиране",
-    "Scanning": "Сканиране",
-    "See external versioning help for supported templated command line parameters.": "Прегледайте външната документацията за поддържаните командни параметри. ",
+    "Resume": "Възобновяване",
+    "Resume All": "Възобновяване всички",
+    "Reused": "Преизползвано",
+    "Revert": "Отменяне",
+    "Revert Local Changes": "Отменяне на местни промени",
+    "Save": "Запазване",
+    "Scan Time Remaining": "Оставащо време до обхождане",
+    "Scanning": "Обхождане",
+    "See external versioning help for supported templated command line parameters.": "Прочетете ръководството за външното управление на версии, за да се запознаете с шаблонните параметри.",
    "Select All": "Всички",
    "Select a version": "Изберете версия",
-    "Select additional devices to share this folder with.": "Select additional devices to share this folder with.",
-    "Select latest version": "Избор на най-новата версия",
-    "Select oldest version": "Избор на най-старата версия",
-    "Select the folders to share with this device.": "Изберете папките за споделяне с това устройство.",
-    "Send & Receive": "Изпращане и получаване",
-    "Send Only": "Само изпращане",
+    "Select additional devices to share this folder with.": "Изберете други устройства, с които да споделите с папката.",
+    "Select additional folders to share with this device.": "Изберете други папки, които да споделите с устройството.",
+    "Select latest version": "Избиране на най-новата версия",
+    "Select oldest version": "Избиране на на най-старата версия",
+    "Send & Receive": "Изпраща и получава",
+    "Send Only": "Само изпраща",
+    "Set Ignores on Added Folder": "Добавяне на шаблони за пренебрегване",
    "Settings": "Настройки",
-    "Share": "Сподели",
-    "Share Folder": "Сподели папка",
-    "Share Folders With Device": "Споделяне на папки с устройството",
-    "Share this folder?": "Сподели тази папка?",
+    "Share": "Споделяне",
+    "Share Folder": "Споделяне на папка",
+    "Share this folder?": "Споделяне на папката?",
+    "Shared Folders": "Споделени папки",
    "Shared With": "Споделена с",
    "Sharing": "Споделяне",
-    "Show ID": "Покажи идентификатора",
-    "Show QR": "Покажи QR",
-    "Show diff with previous version": "Показване на разликите спрямо предната версия",
-    "Shown instead of Device ID in the cluster status. Will be advertised to other devices as an optional default name.": "Показва се вместо идентификатора на устройството в статуса на клъстъра. Ще се ползва за представяне пред останалите устройства.",
-    "Shown instead of Device ID in the cluster status. Will be updated to the name the device advertises if left empty.": "Показва се вместо идентификатора на устройството в статуса на клъстъра. Ще бъде попълнено с името, с което се е представило устройството, ако оставите полето празно.",
-    "Shutdown": "Спри програмата",
+    "Show ID": "Идентификатор",
+    "Show QR": "Преглед на QR",
+    "Show detailed discovery status": "Подробно състояние на откриване",
+    "Show detailed listener status": "Подробно състояние на слушане",
+    "Show diff with previous version": "Показване на разликите с предходната версия",
+    "Shown instead of Device ID in the cluster status. Will be advertised to other devices as an optional default name.": "В списъка на устройствата се показва вместо идентификатор. Ще бъде предложено на другите устройства като име по подразбиране.",
+    "Shown instead of Device ID in the cluster status. Will be updated to the name the device advertises if left empty.": "В списъка на устройствата се показва вместо идентификатор. Ако бъде оставено празно ще бъде променено на името, което носи устройството.",
+    "Shutdown": "Изключване",
    "Shutdown Complete": "Спирането завършено",
-    "Simple File Versioning": "Опростени версии",
-    "Single level wildcard (matches within a directory only)": "Маска на едно ниво (покрива само в папка)",
+    "Simple": "Обикновени",
+    "Simple File Versioning": "Обикновени версии",
+    "Single level wildcard (matches within a directory only)": "Заместващ символ за едно ниво (съвпада само с папка)",
    "Size": "Размер",
-    "Smallest First": "Първо най-малките",
+    "Smallest First": "Първо най-малки",
+    "Some discovery methods could not be established for finding other devices or announcing this device:": "Следните методи за откриване не могат да бъдат използвани за намиране на други устройства или за обявяване на това устройство, за да бъде открито от останалите:",
    "Some items could not be restored:": "Някои елементи не могат да бъдат възстановени:",
-    "Source Code": "Сорс код",
-    "Stable releases and release candidates": "Стабилни версии и кандидати за стабилни версии",
-    "Stable releases are delayed by about two weeks. During this time they go through testing as release candidates.": "Стабилните версии са забавени с две седмици. През това време те преминават през тестване като бъдат кандидат версии.",
+    "Some listening addresses could not be enabled to accept connections:": "Някои от адресите, на които Syncthing очаква връзка не могат да бъдат настроени да получават входящи връзки.",
+    "Source Code": "Изходен код",
+    "Stable releases and release candidates": "Стабилни и предварителни издания",
+    "Stable releases are delayed by about two weeks. During this time they go through testing as release candidates.": "Стабилните издания биват забавяни с две седмици. През този период те преминават през изпитване като предварителни издания.",
    "Stable releases only": "Само стабилни версии",
-    "Staggered File Versioning": "Наслагващи се версии",
-    "Start Browser": "Стартирай браузъра",
+    "Staggered": "Разпределени",
+    "Staggered File Versioning": "Разпределени версии",
+    "Start Browser": "Отваряне в мрежов четец",
    "Statistics": "Статистика",
-    "Stopped": "Не се синхронизира",
+    "Stopped": "Спряна",
+    "Stores and syncs only encrypted data. Folders on all connected devices need to be set up with the same password or be of type \"{%receiveEncrypted%}\" too.": "Съхранява и синхронизира само шифровани данни. Папките на всички свързани устройства трябва да бъдат настроени със същата парола или също да са от вида „{{receiveEncrypted}}“.",
    "Support": "Помощ",
-    "Support Bundle": "Support Bundle",
-    "Sync Protocol Listen Addresses": "Адрес за слушане на синхронизиращия протокол",
+    "Support Bundle": "Архив за поддръжка",
+    "Sync Protocol Listen Addresses": "Адрес, на който слуша синхронизиращия протокол",
+    "Sync Status": "Състояние",
    "Syncing": "Синхронизиране",
-    "Syncthing has been shut down.": "Syncthing е спрян.",
+    "Syncthing has been shut down.": "Syncthing е изключен.",
    "Syncthing includes the following software or portions thereof:": "Syncthing уползотворява частично или изцяло следните софтуерни продукти:",
-    "Syncthing is Free and Open Source Software licensed as MPL v2.0.": "Syncthing is Free and Open Source Software licensed as MPL v2.0.",
-    "Syncthing is restarting.": "Syncthing се рестартира",
+    "Syncthing is Free and Open Source Software licensed as MPL v2.0.": "Syncthing е свободен софтуер с отворен код, под лиценза на MPL v2.0.",
+    "Syncthing is listening on the following network addresses for connection attempts from other devices:": "Syncthing очаква опити за установяване на връзка от други устройства на следните мрежови адреси:",
+    "Syncthing is not listening for connection attempts from other devices on any address.  Only outgoing connections from this device may work.": "Syncthing не слуша за опити за установяване на връзка от други устройства. Вероятно работят само изходящите връзки от това устройство.",
+    "Syncthing is restarting.": "Syncthing се рестартира.",
    "Syncthing is upgrading.": "Syncthing се обновява.",
-    "Syncthing now supports automatically reporting crashes to the developers. This feature is enabled by default.": "Syncthing now supports automatically reporting crashes to the developers. This feature is enabled by default.",
-    "Syncthing seems to be down, or there is a problem with your Internet connection. Retrying…": "Изглежда, че Syncthing не е включен, или има проблем с връзката с Интернет. Повторен опит...",
-    "Syncthing seems to be experiencing a problem processing your request. Please refresh the page or restart Syncthing if the problem persists.": "Syncthing има проблем при обработването на заявката. Моля, презаредете браузъра или рестартирайте Syncthing ако проблемът продължи.",
-    "Take me back": "Take me back",
-    "The GUI address is overridden by startup options. Changes here will not take effect while the override is in place.": "The GUI address is overridden by startup options. Changes here will not take effect while the override is in place.",
-    "The Syncthing Authors": "The Syncthing Authors",
+    "Syncthing now supports automatically reporting crashes to the developers. This feature is enabled by default.": "Syncthing вече поддържа автоматично докладване на сривове на разработчиците. Тази възможност е включена по подразбиране.",
+    "Syncthing seems to be down, or there is a problem with your Internet connection. Retrying…": "Изглежда, че Syncthing не работи или няма достъп до интернет. Извършва се повторен опит…",
+    "Syncthing seems to be experiencing a problem processing your request. Please refresh the page or restart Syncthing if the problem persists.": "Syncthing има проблем при обработването на заявката. Презаредете страницата или рестартирайте Syncthing ако проблемът продължава да съществува.",
+    "Take me back": "Назад",
+    "The GUI address is overridden by startup options. Changes here will not take effect while the override is in place.": "Адресът на интерфейса не се взима под внимание заради параметри при стартиране. Промените тук няма да бъдат отразени докато параметрите не бъдат променени.",
+    "The Syncthing Authors": "Автори на Syncthing",
    "The Syncthing admin interface is configured to allow remote access without a password.": "Администраторският панел на Syncthing разрешава дистанционен достъп без да изисква парола.",
-    "The aggregated statistics are publicly available at the URL below.": "Обобщение на събраните статистически ще намерите на долния URL адрес.",
-    "The configuration has been saved but not activated. Syncthing must restart to activate the new configuration.": "Конфигурацията е запазена, но не е активирана. Syncthing трябва да рестартира, за да се активира новата конфигурация.",
+    "The aggregated statistics are publicly available at the URL below.": "Обобщените статистически данни са публично достъпни на адреса по-долу.",
+    "The cleanup interval cannot be blank.": "Интервалът на почистване не може да бъде празен.",
+    "The configuration has been saved but not activated. Syncthing must restart to activate the new configuration.": "Настройките са запазени, но не са приложени. За да влязат в сила Syncthing трябва да се рестартира.",
    "The device ID cannot be blank.": "Полето идентификатор на устройство не може да бъде празно.",
-    "The device ID to enter here can be found in the \"Actions > Show ID\" dialog on the other device. Spaces and dashes are optional (ignored).": "Идентификатор на устройство за въвеждане тук, може да бъде намерен в \"Промени > Покажи идентификатора\" на другото устройство. Интервалите и тиретата са пожелание (биват прескачани).",
-    "The encrypted usage report is sent daily. It is used to track common platforms, folder sizes and app versions. If the reported data set is changed you will be prompted with this dialog again.": "Криптиран статистически доклад ще се изпраща ежедневно. Ползва се, за отичане на ползваните платформи, размер на папки и версии на приложението. При промяна в събираните данни, ще бъдете информирани от подобен на този прозорец.",
-    "The entered device ID does not look valid. It should be a 52 or 56 character string consisting of letters and numbers, with spaces and dashes being optional.": "Въведеният идентификатор на устройство не е валиден. Трябва да бъде 52 или 56 символа и да се състои от букви и цифри, като интервалите и тиретата са пожелание.",
+    "The device ID to enter here can be found in the \"Actions > Show ID\" dialog on the other device. Spaces and dashes are optional (ignored).": "Идентификаторът на устройството, който да въведете се намира в „Действия > Идентификатор“. Интервалите и дефисите са незадължителни.",
+    "The encrypted usage report is sent daily. It is used to track common platforms, folder sizes and app versions. If the reported data set is changed you will be prompted with this dialog again.": "Шифрованият отчет за употреба се изпраща ежедневно. Използва се за отчитане на най-често срещаните платформи, размери на папки и издания на приложението. При промяна в събираните данни отново ще бъде поискано вашето съгласие.",
+    "The entered device ID does not look valid. It should be a 52 or 56 character string consisting of letters and numbers, with spaces and dashes being optional.": "Въведеният идентификатор на устройство не е валиден. Трябва да бъде 52 или 56 символа и да се състои от букви и цифри, като интервалите и дефисите са незадължителни.",
    "The folder ID cannot be blank.": "Полето идентификатор на папка не може да бъде празно.",
    "The folder ID must be unique.": "Идентификаторът на папката трябва да бъде уникален.",
+    "The folder content on other devices will be overwritten to become identical with this device. Files not present here will be deleted on other devices.": "Съдържанието на папката в другите устройства ще бъде презаписано, за да стане еднакво със съдържанието на това устройство. Файловете, които ги няма тук, но съществуват на другите устройства ще бъдат премахнати.",
+    "The folder content on this device will be overwritten to become identical with other devices. Files newly added here will be deleted.": "Съдържанието на папката в това устройство ще бъде презаписано, за да стане еднакво със съдържанието на другите устройства. Добавените файлове ще бъдат премахнати.",
    "The folder path cannot be blank.": "Пътят до папката не може да бъде празен.",
-    "The following intervals are used: for the first hour a version is kept every 30 seconds, for the first day a version is kept every hour, for the first 30 days a version is kept every day, until the maximum age a version is kept every week.": "Използва се следния интервал: за първия час се пази версия на всеки 30 секунди, за първия ден се пази версия на всеки час, за първите 30 дена се пази версия всеки ден, до максимума се пази една версия всяка седмица.",
+    "The following intervals are used: for the first hour a version is kept every 30 seconds, for the first day a version is kept every hour, for the first 30 days a version is kept every day, until the maximum age a version is kept every week.": "Използват се следните интервали: за първия час се пази версия на всеки 30 секунди, за първия ден - на всеки час, за първите 30 дена - всеки ден, до максимума се пази една версия всяка седмица.",
    "The following items could not be synchronized.": "Следните елементи не могат да бъдат синхронизирани.",
-    "The following items were changed locally.": "The following items were changed locally.",
+    "The following items were changed locally.": "Следните елементи са променени локално.",
+    "The following methods are used to discover other devices on the network and announce this device to be found by others:": "Следните методи се използват за откриване на други устройства в мрежата и за обявяване на това устройство, за да бъде открито от останалите:",
+    "The following unexpected items were found.": "Следните елементи са намерени, но не са очаквани.",
+    "The interval must be a positive number of seconds.": "Интервалът трябва да е положителен брой секунди.",
+    "The interval, in seconds, for running cleanup in the versions directory. Zero to disable periodic cleaning.": "Интервал, в секунди, на почистване на папката с версии. Нула изключва периодичното почистване.",
    "The maximum age must be a number and cannot be blank.": "Максималната възраст трябва да е число, полето не може да бъде празно.",
-    "The maximum time to keep a version (in days, set to 0 to keep versions forever).": "Максималното време за пазене на версия (в дни, задайте 0 за да не бъдат изтривани версии).",
+    "The maximum time to keep a version (in days, set to 0 to keep versions forever).": "Максимална продължителност за пазене на версия (в дни, за да не бъдат изтривани версии задайте 0).",
    "The number of days must be a number and cannot be blank.": "Броят дни трябва да бъде число и не може да бъде празно.",
-    "The number of days to keep files in the trash can. Zero means forever.": "Броят дни за запазване на файловете в кошчето. Нула значи завинаги.",
-    "The number of old versions to keep, per file.": "Броят стари версии, които да бъдат пазени за всеки файл.",
+    "The number of days to keep files in the trash can. Zero means forever.": "Брой дни за пазене на файловете в кошчето. Нула значи завинаги.",
+    "The number of old versions to keep, per file.": "Брой стари версии, които да бъдат пазени за всеки файл.",
    "The number of versions must be a number and cannot be blank.": "Броят версии трябва да бъде число и не може да бъде празно.",
    "The path cannot be blank.": "Пътят не може да бъде празен.",
    "The rate limit must be a non-negative number (0: no limit)": "Ограничението на скоростта трябва да бъде положително число (0: неограничено)",
-    "The rescan interval must be a non-negative number of seconds.": "Интервала на сканиране трябва да бъде не отрицателно число в секунди.",
-    "There are no devices to share this folder with.": "There are no devices to share this folder with.",
-    "They are retried automatically and will be synced when the error is resolved.": "Ще бъдат спрени и автоматично синхронизирани, когато грешката бъде оправена.",
-    "This Device": "Вашето устройство",
-    "This can easily give hackers access to read and change any files on your computer.": "Така се предоставя изключително лесен достъп (четене, редактиране и изтриване) до всеки файл, на компютъра Ви.",
-    "This is a major version upgrade.": "Това е нова основна версия.",
-    "This setting controls the free space required on the home (i.e., index database) disk.": "Тази настройка контролира нужното свободното място на основния (пр. този с базата данни) диск.",
+    "The remote device has not accepted sharing this folder.": "Отдалеченото устройство не е приело да споделя папката.",
+    "The remote device has paused this folder.": "Отдалеченото устройство е оставило на пауза папката.",
+    "The rescan interval must be a non-negative number of seconds.": "Интервалът на обхождане трябва да е положителен брой секунди.",
+    "There are no devices to share this folder with.": "Няма устройства, с които да споделите папката.",
+    "There are no file versions to restore.": "Файлът няма версии, които да бъдат възстановени.",
+    "There are no folders to share with this device.": "Няма папка, която да споделите с устройството.",
+    "They are retried automatically and will be synced when the error is resolved.": "Ще бъдат спрени и автоматично синхронизирани, когато грешката бъде отстранена.",
+    "This Device": "Това устройство",
+    "This Month": "Този месец",
+    "This can easily give hackers access to read and change any files on your computer.": "Така се предоставя лесен достъп за четене и промяна на всеки файл на компютъра.",
+    "This device cannot automatically discover other devices or announce its own address to be found by others.  Only devices with statically configured addresses can connect.": "Устройството не може автоматично да открива други устройства или да обяви своя адрес, за да бъде намерено от другите. Само устройствата със статично настроени адреси могат да се свързват.",
+    "This is a major version upgrade.": "Това е обновяване на значимо издание.",
+    "This setting controls the free space required on the home (i.e., index database) disk.": "Тази настройка управлява нужното свободното място на основния (пр. този с банката от данни) диск.",
    "Time": "Време",
-    "Time the item was last modified": "Часът на последна промяна на елемента",
-    "Trash Can File Versioning": "Само на файловете в кошчето",
-    "Type": "Тип",
-    "UNIX Permissions": "UNIX Permissions",
-    "Unavailable": "Не е на разположение",
-    "Unavailable/Disabled by administrator or maintainer": "Не е на разположение/Деактивриан от администраторът или поддръжника",
+    "Time the item was last modified": "Час на последна промяна на елемента",
+    "Today": "Днес",
+    "Trash Can": "Кошче за отпадъци",
+    "Trash Can File Versioning": "Версии от вида „кошче за отпадъци“",
+    "Twitter": "Twitter",
+    "Type": "Вид",
+    "UNIX Permissions": "Права на UNIX",
+    "Unavailable": "Няма налични",
+    "Unavailable/Disabled by administrator or maintainer": "Недостъпно или изключено от администратора или поддръжката",
    "Undecided (will prompt)": "Неизбрано (ще попита)",
-    "Unignore": "Unignore",
+    "Unexpected Items": "Неочаквани елементи",
+    "Unexpected items have been found in this folder.": "В папката са намерени неочаквани елементи.",
+    "Unignore": "Отменяне на пренебрегване",
    "Unknown": "Неясно",
    "Unshared": "Несподелена",
-    "Unshared Devices": "Unshared Devices",
+    "Unshared Devices": "Устройства, с които не е споделена",
+    "Unshared Folders": "Несподелени папки",
+    "Untrusted": "Недоверено",
    "Up to Date": "Синхронизирано",
-    "Updated": "Обновено",
-    "Upgrade": "Обнови",
-    "Upgrade To {%version%}": "Обновен до {{version}}",
+    "Updated {%file%}": "{{file}} обновен",
+    "Upgrade": "Обновяване",
+    "Upgrade To {%version%}": "Обновяване до {{version}}",
    "Upgrading": "Обновяване",
    "Upload Rate": "Скорост на качване",
    "Uptime": "Работи от",
-    "Usage reporting is always enabled for candidate releases.": "Докладът за ползването е винаги включен за кандидат нови версии.",
-    "Use HTTPS for GUI": "Използвай HTTPS за потребителския интерфейс",
-    "Username/Password has not been set for the GUI authentication. Please consider setting it up.": "Username/Password has not been set for the GUI authentication. Please consider setting it up.",
-    "Version": "Версия",
+    "Usage reporting is always enabled for candidate releases.": "Отчитането на употребата винаги е включено за предварителни издания.",
+    "Use HTTPS for GUI": "Графичният интерфейс работи под HTTPS",
+    "Use notifications from the filesystem to detect changed items.": "Използва съобщения от файловата система, за да открива променени елементи.",
+    "Username/Password has not been set for the GUI authentication. Please consider setting it up.": "Няма зададени потребителско име и парола за достъп до графичния интерфейс. Помислете за създаването им.",
+    "Version": "Издание",
    "Versions": "Версии",
    "Versions Path": "Път до версиите",
-    "Versions are automatically deleted if they are older than the maximum age or exceed the number of files allowed in an interval.": "Версиите биват изтривани автоматично, когато са по-стари от максималната възраст или надминават броя версии разрешени в даден интервал.",
-    "Waiting to Scan": "Waiting to Scan",
-    "Waiting to Sync": "Waiting to Sync",
-    "Warning, this path is a parent directory of an existing folder \"{%otherFolder%}\".": "Предупреждение, този път е по-горна директория на съществуващата папка \"{{otherFolder}}\".",
-    "Warning, this path is a parent directory of an existing folder \"{%otherFolderLabel%}\" ({%otherFolder%}).": "Предупреждение, този път е по-горна директория на съществуващата папка \"{{otherFolderLabel}}\" ({{otherFolder}}).",
-    "Warning, this path is a subdirectory of an existing folder \"{%otherFolder%}\".": "Внимание, това е вътрешна папка на вече съществуваща папка \"{{otherFolder}}\".",
-    "Warning, this path is a subdirectory of an existing folder \"{%otherFolderLabel%}\" ({%otherFolder%}).": "Предупреждение, този път е под-директория на съществуващата папка \"{{otherFolderLabel}}\" ({{otherFolder}}).",
-    "Warning: If you are using an external watcher like {%syncthingInotify%}, you should make sure it is deactivated.": "Предупреждение: Ако използвате външна програма за наблюдение като {{syncthingInotify}}, трябва да я деактивирате.",
-    "Watch for Changes": "Мониторинг за промени",
-    "Watching for Changes": "Мониторинг за промени",
-    "Watching for changes discovers most changes without periodic scanning.": "Watching for changes discovers most changes without periodic scanning.",
-    "When adding a new device, keep in mind that this device must be added on the other side too.": "Когато добавяте ново устройство имайте предвид, че това устройство също трябва да бъде добавено от другата страна.",
-    "When adding a new folder, keep in mind that the Folder ID is used to tie folders together between devices. They are case sensitive and must match exactly between all devices.": "Когато добавяте нов идентификатор на папка имайте предвид, че той се използва за свързване на папките между отделните устройства. Идентификатора разграничава главни/малки букви.",
+    "Versions are automatically deleted if they are older than the maximum age or exceed the number of files allowed in an interval.": "Версиите биват изтривани автоматично ако са по-стари от максималната възраст или надминават броя разрешени версии за определено време.",
+    "Waiting to Clean": "Изчаква за почистване",
+    "Waiting to Scan": "Изчаква за обхождане",
+    "Waiting to Sync": "Изчаква за синхронизиране",
+    "Warning": "Внимание",
+    "Warning, this path is a parent directory of an existing folder \"{%otherFolder%}\".": "Внимание, този път е родителска папка съществуващата „{{otherFolder}}“.",
+    "Warning, this path is a parent directory of an existing folder \"{%otherFolderLabel%}\" ({%otherFolder%}).": "Внимание, този път е родителска папка съществуващата „{{otherFolderLabel}}“ ({{otherFolder}}).",
+    "Warning, this path is a subdirectory of an existing folder \"{%otherFolder%}\".": "Внимание, този път е подпапка съществуващата „{{otherFolder}}“.",
+    "Warning, this path is a subdirectory of an existing folder \"{%otherFolderLabel%}\" ({%otherFolder%}).": "Внимание, този път е подпапка на съществуващата „{{otherFolderLabel}}“ ({{otherFolder}}).",
+    "Warning: If you are using an external watcher like {%syncthingInotify%}, you should make sure it is deactivated.": "Внимание: Ако използвате външно приложение за наблюдение като {{syncthingInotify}}, трябва да го спрете.",
+    "Watch for Changes": "Наблюдаване за промени",
+    "Watching for Changes": "Наблюдаване за промени",
+    "Watching for changes discovers most changes without periodic scanning.": "Наблюдението за промени открива повечето изменения без периодични обхождания.",
+    "When adding a new device, keep in mind that this device must be added on the other side too.": "Когато добавяте ново устройство имайте предвид, че то също трябва да бъде добавено от другата страна.",
+    "When adding a new folder, keep in mind that the Folder ID is used to tie folders together between devices. They are case sensitive and must match exactly between all devices.": "Като добавяте папката имайте предвид, че той се използва за еднозначно указване на папката между устройствата. Има разлика в регистъра на знаците и трябва изцяло да съвпада между всички устройства.",
    "Yes": "Да",
-    "You can also select one of these nearby devices:": "Също така може да изберете едно от устройствата, които намират се наблизо:",
+    "Yesterday": "Вчера",
+    "You can also select one of these nearby devices:": "Също така може да изберете едно от устройствата, които се намират наблизо:",
    "You can change your choice at any time in the Settings dialog.": "Може да промените решението си по всяко време в прозореца Настройки.",
-    "You can read more about the two release channels at the link below.": "Може да научите допълнително за двата канала на версии, следвайки връзката по-долу.",
-    "You have no ignored devices.": "Няма игнорирани устройства.",
-    "You have no ignored folders.": "Няма игнорирани папки.",
-    "You have unsaved changes. Do you really want to discard them?": "Има незапазени промени. Наистина ли желаете да ги отмените?",
-    "You must keep at least one version.": "Трябва да пазиш поне една версия.",
+    "You can read more about the two release channels at the link below.": "Може да научите повече за двата канала на издание, следвайки препратката по-долу.",
+    "You have no ignored devices.": "Няма пренебрегнати устройства.",
+    "You have no ignored folders.": "Няма пренебрегнати папки.",
+    "You have unsaved changes. Do you really want to discard them?": "Има незапазени промени. Желаете ли да се откажете от тях?",
+    "You must keep at least one version.": "Необходимо е да има поне една версия.",
+    "You should never add or change anything locally in a \"{%receiveEncrypted%}\" folder.": "Никога не трябва да променяте нищо в папка от вида „{{receiveEncrypted}}“.",
    "days": "дни",
+    "directories": "папки",
    "files": "файла",
    "full documentation": "пълна документация",
    "items": "елемента",
-    "{%device%} wants to share folder \"{%folder%}\".": "{{device}} желае да сподели папката \"{{folder}}\".",
-    "{%device%} wants to share folder \"{%folderlabel%}\" ({%folder%}).": "{{device}} желае да сподели папката \"{{folderlabel}}\" ({{folder}})."
+    "seconds": "секунди",
+    "theme-name-black": "Черна",
+    "theme-name-dark": "Тъмна",
+    "theme-name-default": "По подразбиране",
+    "theme-name-light": "Светла",
+    "{%device%} wants to share folder \"{%folder%}\".": "{{device}} споделя папката „{{folder}}“.",
+    "{%device%} wants to share folder \"{%folderlabel%}\" ({%folder%}).": "{{device}} споделя папката „{{folder}}“. ({{folder}}).",
+    "{%reintroducer%} might reintroduce this device.": "Поръчителят {{reintroducer}} може отново да предложи това устройство."
 }
--- a/Show More
+++ b/Show More