gui, man, authors: Update docs, translations, and contributors

Use a style for options that is consistent with the documentation and
other uses.

.github/dependabot.yml

@@ -1,7 +1,13 @@
 version: 2
 updates:
-- package-ecosystem: gomod
-  directory: "/"
-  schedule:
-    interval: weekly
-  open-pull-requests-limit: 10
+  - 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

.github/workflows/build-infra-dockers.yaml

@@ -0,0 +1,61 @@
+name: Build Infrastructure Images
+
+on:
+  push:
+    branches:
+      - infrastructure
+
+env:
+  GO_VERSION: "~1.21.5"
+  CGO_ENABLED: "0"
+  BUILD_USER: docker
+  BUILD_HOST: github.syncthing.net
+
+jobs:
+  docker-syncthing:
+    name: Build and push Docker images
+    runs-on: ubuntu-latest
+    environment: docker
+    strategy:
+      matrix:
+        pkg:
+          - stcrashreceiver
+          - strelaypoolsrv
+          - stupgrades
+          - ursrv
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.GO_VERSION }}
+          check-latest: true
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build binaries
+        run: |
+          for arch in arm64 amd64; do
+            go run build.go -goos linux -goarch "$arch" build ${{ matrix.pkg }}
+            mv ${{ matrix.pkg }} ${{ matrix.pkg }}-linux-"$arch"
+          done
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./Dockerfile.${{ matrix.pkg }}
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: syncthing/${{ matrix.pkg }}:latest,syncthing/${{ matrix.pkg }}:${{ github.sha }}
+          labels: |
+            org.opencontainers.image.revision=${{ github.sha }}

.github/workflows/build-syncthing.yaml

@@ -0,0 +1,830 @@
+name: Build Syncthing
+
+on:
+  pull_request:
+  push:
+  schedule:
+    # Run nightly build at 05:00 UTC
+    - cron: '00 05 * * *'
+  workflow_dispatch:
+
+env:
+  # The go version to use for builds. We set check-latest to true when
+  # installing, so we get the latest patch version that matches the
+  # expression.
+  GO_VERSION: "~1.21.5"
+
+  # Optimize compatibility on the slow archictures.
+  GO386: softfloat
+  GOARM: "5"
+  GOMIPS: softfloat
+
+  # Avoid hilarious amounts of obscuring log output when running tests.
+  LOGGER_DISCARD: "1"
+
+  # Our build metadata
+  BUILD_USER: builder
+  BUILD_HOST: github.syncthing.net
+
+# A note on actions and third party code... The actions under actions/ (like
+# `uses: actions/checkout`) are maintained by GitHub, and we need to trust
+# GitHub to maintain their code and infrastructure or we're in deep shit in
+# general. The same doesn't necessarily apply to other actions authors, so
+# some care needs to be taken when adding steps, especially in the paths
+# that lead up to code being packaged and signed.
+
+jobs:
+
+  #
+  # Tests for all platforms. Runs a matrix build on Windows, Linux and Mac,
+  # with the list of expected supported Go versions (current, previous).
+  #
+
+  build-test:
+    name: Build and test
+    strategy:
+      fail-fast: false
+      matrix:
+        runner: ["windows-latest", "ubuntu-latest", "macos-latest"]
+        # The oldest version in this list should match what we have in our go.mod.
+        # Variables don't seem to be supported here, or we could have done something nice.
+        go: ["~1.20.12", "~1.21.5"]
+    runs-on: ${{ matrix.runner }}
+    steps:
+      - name: Set git to use LF
+        if: matrix.runner == 'windows-latest'
+        # Without this, the Windows checkout will happen with CRLF line
+        # endings, which is fine for the source code but messes up tests
+        # that depend on data on disk being as expected. Ideally, those
+        # tests should be fixed, but not today.
+        run: |
+          git config --global core.autocrlf false
+          git config --global core.eol lf
+
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ matrix.go }}
+          cache: true
+          check-latest: true
+
+      - name: Build
+        run: |
+          go run build.go
+
+      - name: Install go-test-json-to-loki
+        run: |
+          go install calmh.dev/go-test-json-to-loki@latest
+
+      - name: Test
+        run: |
+          go version
+          go run build.go test | go-test-json-to-loki
+        env:
+          GOFLAGS: "-json"
+          LOKI_URL: ${{ vars.LOKI_URL }}
+          LOKI_USER: ${{ vars.LOKI_USER }}
+          LOKI_PASSWORD: ${{ secrets.LOKI_PASSWORD }}
+          LOKI_LABELS: "go=${{ matrix.go }},runner=${{ matrix.runner }},repo=${{ github.repository }},ref=${{ github.ref }}"
+
+  #
+  # Meta checks for formatting, copyright, etc
+  #
+
+  correctness:
+    name: Check correctness
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.GO_VERSION }}
+          cache: false
+          check-latest: true
+
+      - name: Check correctness
+        run: |
+          go test -v ./meta
+
+  #
+  # The basic checks job is a virtual one that depends on the matrix tests,
+  # the correctness checks, and various builds that we always do. This makes
+  # it easy to have the PR process have a single test as a gatekeeper for
+  # merging, instead of having to add all the matrix tests and update them
+  # each time the version changes. (The top level test is not available for
+  # choosing there, only the matrix "children".)
+  #
+
+  basics:
+    name: Basic checks passed
+    runs-on: ubuntu-latest
+    needs:
+      - build-test
+      - correctness
+      - package-linux
+      - package-cross
+      - package-source
+      - package-debian
+      - govulncheck
+    steps:
+      - uses: actions/checkout@v4
+
+  #
+  # Windows
+  #
+
+  package-windows:
+    name: Package for Windows
+    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release' || startsWith(github.ref, 'refs/heads/release-'))
+    environment: signing
+    runs-on: windows-latest
+    steps:
+      - name: Set git to use LF
+        # Without this, the checkout will happen with CRLF line endings,
+        # which is fine for the source code but messes up tests that depend
+        # on data on disk being as expected. Ideally, those tests should be
+        # fixed, but not today.
+        run: |
+          git config --global core.autocrlf false
+          git config --global core.eol lf
+
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.GO_VERSION }}
+          cache: false
+          check-latest: true
+
+      - name: Get actual Go version
+        run: |
+          go version
+          echo "GO_VERSION=$(go version | sed 's#^.*go##;s# .*##')" >> $GITHUB_ENV
+
+      - uses: actions/cache@v3
+        with:
+          path: |
+            ~\AppData\Local\go-build
+            ~\go\pkg\mod
+          key: ${{ runner.os }}-go-${{ env.GO_VERSION }}-package-${{ hashFiles('**/go.sum') }}
+
+      - name: Install dependencies
+        run: |
+          go install github.com/josephspurrier/goversioninfo/cmd/goversioninfo@v1.4.0
+
+      - name: Create packages
+        run: |
+          go run build.go -goarch amd64 zip
+          go run build.go -goarch arm zip
+          go run build.go -goarch arm64 zip
+          go run build.go -goarch 386 zip
+        env:
+          CGO_ENABLED: "0"
+          CODESIGN_SIGNTOOL: ${{ secrets.CODESIGN_SIGNTOOL }}
+          CODESIGN_CERTIFICATE_BASE64: ${{ secrets.CODESIGN_CERTIFICATE_BASE64 }}
+          CODESIGN_CERTIFICATE_PASSWORD: ${{ secrets.CODESIGN_CERTIFICATE_PASSWORD }}
+          CODESIGN_TIMESTAMP_SERVER: ${{ secrets.CODESIGN_TIMESTAMP_SERVER }}
+
+      - name: Archive artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: packages-windows
+          path: syncthing-windows-*.zip
+
+  #
+  # Linux
+  #
+
+  package-linux:
+    name: Package for Linux
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.GO_VERSION }}
+          cache: false
+          check-latest: true
+
+      - name: Get actual Go version
+        run: |
+          go version
+          echo "GO_VERSION=$(go version | sed 's#^.*go##;s# .*##')" >> $GITHUB_ENV
+
+      - uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cache/go-build
+            ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ env.GO_VERSION }}-package-${{ hashFiles('**/go.sum') }}
+
+      - name: Create packages
+        run: |
+          archs=$(go tool dist list | grep linux | sed 's#linux/##')
+          for goarch in $archs ; do
+            go run build.go -goarch "$goarch" tar
+          done
+        env:
+          CGO_ENABLED: "0"
+
+      - name: Archive artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: packages-linux
+          path: syncthing-linux-*.tar.gz
+
+  #
+  # macOS
+  #
+
+  package-macos:
+    name: Package for macOS
+    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release' || startsWith(github.ref, 'refs/heads/release-'))
+    environment: signing
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.GO_VERSION }}
+          cache: false
+          check-latest: true
+
+      - name: Get actual Go version
+        run: |
+          go version
+          echo "GO_VERSION=$(go version | sed 's#^.*go##;s# .*##')" >> $GITHUB_ENV
+
+      - uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cache/go-build
+            ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ env.GO_VERSION }}-package-${{ hashFiles('**/go.sum') }}
+
+      - name: Import signing certificate
+        run: |
+          # Set up a run-specific keychain, making it available for the
+          # `codesign` tool.
+          umask 066
+          KEYCHAIN_PATH=$RUNNER_TEMP/codesign.keychain
+          KEYCHAIN_PASSWORD=$(uuidgen)
+          security create-keychain -p "$KEYCHAIN_PASSWORD" "$KEYCHAIN_PATH"
+          security default-keychain -s "$KEYCHAIN_PATH"
+          security unlock-keychain -p "$KEYCHAIN_PASSWORD" "$KEYCHAIN_PATH"
+          security set-keychain-settings -lut 21600 "$KEYCHAIN_PATH"
+
+          # Import the certificate
+          CERTIFICATE_PATH=$RUNNER_TEMP/codesign.p12
+          echo "$DEVELOPER_ID_CERTIFICATE_BASE64" | base64 -d -o "$CERTIFICATE_PATH"
+          security import "$CERTIFICATE_PATH" -k "$KEYCHAIN_PATH" -P "$DEVELOPER_ID_CERTIFICATE_PASSWORD" -T /usr/bin/codesign -T /usr/bin/productsign
+          security set-key-partition-list -S apple-tool:,apple: -s -k actions "$KEYCHAIN_PATH"
+
+          # Set the codesign identity for following steps
+          echo "CODESIGN_IDENTITY=$CODESIGN_IDENTITY" >> $GITHUB_ENV
+        env:
+          DEVELOPER_ID_CERTIFICATE_BASE64: ${{ secrets.DEVELOPER_ID_CERTIFICATE_BASE64 }}
+          DEVELOPER_ID_CERTIFICATE_PASSWORD: ${{ secrets.DEVELOPER_ID_CERTIFICATE_PASSWORD }}
+          CODESIGN_IDENTITY: ${{ secrets.CODESIGN_IDENTITY }}
+
+      - name: Create package (amd64)
+        run: |
+          go run build.go -goarch amd64 zip
+        env:
+          CGO_ENABLED: "1"
+
+      - name: Create package (arm64 cross)
+        run: |
+          cat <<EOT > xgo.sh
+          #!/bin/bash
+          CGO_ENABLED=1 \
+            CGO_CFLAGS="-target arm64-apple-macos10.15" \
+            CGO_LDFLAGS="-target arm64-apple-macos10.15" \
+            go "\$@"
+          EOT
+          chmod 755 xgo.sh
+          go run build.go -gocmd ./xgo.sh -goarch arm64 zip
+        env:
+          CGO_ENABLED: "1"
+
+      - name: Create package (universal)
+        run: |
+          rm -rf _tmp
+          mkdir _tmp
+          pushd _tmp
+
+          unzip ../syncthing-macos-amd64-*.zip
+          unzip ../syncthing-macos-arm64-*.zip
+          lipo -create syncthing-macos-amd64-*/syncthing syncthing-macos-arm64-*/syncthing -o syncthing
+
+          amd64=(syncthing-macos-amd64-*)
+          universal="${amd64/amd64/universal}"
+          mv "$amd64" "$universal"
+          mv syncthing "$universal"
+          zip -r "../$universal.zip" "$universal"
+
+      - name: Archive artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: packages-macos
+          path: syncthing-*.zip
+
+  notarize-macos:
+    name: Notarize for macOS
+    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release' || startsWith(github.ref, 'refs/heads/release-'))
+    environment: signing
+    needs:
+      - package-macos
+      - basics
+    runs-on: macos-latest
+    steps:
+      - name: Download artifacts
+        uses: actions/download-artifact@v3
+        with:
+          name: packages-macos
+
+      - name: Notarize binaries
+        run: |
+          APPSTORECONNECT_API_KEY_PATH="$RUNNER_TEMP/apikey.p8"
+          echo "$APPSTORECONNECT_API_KEY" | base64 -d -o "$APPSTORECONNECT_API_KEY_PATH"
+          for file in syncthing-macos-*.zip ; do
+            xcrun notarytool submit \
+              -k "$APPSTORECONNECT_API_KEY_PATH" \
+              -d "$APPSTORECONNECT_API_KEY_ID" \
+              -i "$APPSTORECONNECT_API_KEY_ISSUER" \
+              $file
+          done
+        env:
+          APPSTORECONNECT_API_KEY: ${{ secrets.APPSTORECONNECT_API_KEY }}
+          APPSTORECONNECT_API_KEY_ID: ${{ secrets.APPSTORECONNECT_API_KEY_ID }}
+          APPSTORECONNECT_API_KEY_ISSUER: ${{ secrets.APPSTORECONNECT_API_KEY_ISSUER }}
+
+  #
+  # Cross compile other unixes
+  #
+
+  package-cross:
+    name: Package cross compiled
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.GO_VERSION }}
+          cache: false
+          check-latest: true
+
+      - name: Get actual Go version
+        run: |
+          go version
+          echo "GO_VERSION=$(go version | sed 's#^.*go##;s# .*##')" >> $GITHUB_ENV
+
+      - uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cache/go-build
+            ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ env.GO_VERSION }}-cross-${{ hashFiles('**/go.sum') }}
+
+      - name: Create packages
+        run: |
+          platforms=$(go tool dist list \
+            | grep -v aix/ppc64 \
+            | grep -v android/ \
+            | grep -v darwin/ \
+            | grep -v ios/ \
+            | grep -v js/ \
+            | grep -v linux/ \
+            | grep -v nacl/ \
+            | grep -v plan9/ \
+            | grep -v windows/ \
+            | grep -v /wasm \
+          )
+
+          # Build for each platform with errors silenced, because we expect
+          # some oddball platforms to fail. This avoids a bunch of errors in
+          # the GitHub Actions output, instead summarizing each build
+          # failure as a warning.
+          for plat in $platforms; do
+            goos="${plat%/*}"
+            goarch="${plat#*/}"
+            echo "::group ::$plat"
+            if ! go run build.go -goos "$goos" -goarch "$goarch" tar 2>/dev/null; then
+              echo "::warning ::Failed to build for $plat"
+            fi
+            echo "::endgroup::"
+          done
+        env:
+          CGO_ENABLED: "0"
+
+      - name: Archive artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: packages-other
+          path: syncthing-*.tar.gz
+
+  #
+  # Source
+  #
+
+  package-source:
+    name: Package source code
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.GO_VERSION }}
+          cache: false
+          check-latest: true
+
+      - name: Package source
+        run: |
+          version=$(go run build.go version)
+          echo "$version" > RELEASE
+
+          go mod vendor
+          go run build.go assets
+
+          cd ..
+
+          tar c -z -f "syncthing-source-$version.tar.gz" \
+            --exclude .git \
+            syncthing
+
+          mv "syncthing-source-$version.tar.gz" syncthing
+
+      - name: Archive artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: packages-source
+          path: syncthing-source-*.tar.gz
+
+  #
+  # Sign binaries for auto upgrade, generate ASC signature files
+  #
+
+  sign-for-upgrade:
+    name: Sign for upgrade
+    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release' || startsWith(github.ref, 'refs/heads/release-'))
+    environment: signing
+    needs:
+      - basics
+      - package-windows
+      - package-linux
+      - package-macos
+      - package-cross
+      - package-source
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/checkout@v4
+        with:
+          repository: syncthing/release-tools
+          path: tools
+          fetch-depth: 0
+
+      - name: Download artifacts
+        uses: actions/download-artifact@v3
+
+      - name: Install signing tool
+        run: |
+          go install ./cmd/stsigtool
+
+      - name: Sign archives
+        run: |
+          export PRIVATE_KEY="$RUNNER_TEMP/privkey.pem"
+          export PATH="$PATH:$(go env GOPATH)/bin"
+          echo "$STSIGTOOL_PRIVATE_KEY" | base64 -d > "$PRIVATE_KEY"
+          mkdir packages
+          mv packages-*/* packages
+          pushd packages
+          "$GITHUB_WORKSPACE/tools/sign-only"
+          rm -f "$PRIVATE_KEY"
+        env:
+          STSIGTOOL_PRIVATE_KEY: ${{ secrets.STSIGTOOL_PRIVATE_KEY }}
+
+      - name: Create and sign .asc files
+        run: |
+          sudo apt update
+          sudo apt -y install gnupg
+
+          export SIGNING_KEY="$RUNNER_TEMP/gpg-secret.asc"
+          echo "$GNUPG_SIGNING_KEY_BASE64" | base64 -d > "$SIGNING_KEY"
+          gpg --import < "$SIGNING_KEY"
+
+          pushd packages
+          files=(*.tar.gz *.zip)
+          sha1sum "${files[@]}" | gpg --clearsign > sha1sum.txt.asc
+          sha256sum "${files[@]}" | gpg --clearsign > sha256sum.txt.asc
+          gpg --sign --armour --detach syncthing-source-*.tar.gz
+          popd
+          rm -f "$SIGNING_KEY" .gnupg
+        env:
+          GNUPG_SIGNING_KEY_BASE64: ${{ secrets.GNUPG_SIGNING_KEY_BASE64 }}
+
+      - name: Archive artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: packages-signed
+          path: packages/*
+
+  #
+  # Debian
+  #
+
+  package-debian:
+    name: Package for Debian
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.GO_VERSION }}
+          cache: false
+          check-latest: true
+
+      - name: Get actual Go version
+        run: |
+          go version
+          echo "GO_VERSION=$(go version | sed 's#^.*go##;s# .*##')" >> $GITHUB_ENV
+
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.0'
+
+      - name: Install fpm
+        run: |
+          gem install fpm
+
+      - uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cache/go-build
+            ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ env.GO_VERSION }}-debian-${{ hashFiles('**/go.sum') }}
+
+      - name: Package for Debian
+        run: |
+          for arch in amd64 i386 armhf armel arm64 ; do
+            go run build.go -no-upgrade -installsuffix=no-upgrade -goarch "$arch" deb
+          done
+        env:
+          BUILD_USER: debian
+
+      - name: Archive artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: debian-packages
+          path: "*.deb"
+
+  #
+  # Nightlies
+  #
+
+  publish-nightly:
+    name: Publish nightly build
+    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && startsWith(github.ref, 'refs/heads/release-nightly')
+    environment: signing
+    needs:
+      - sign-for-upgrade
+      - notarize-macos
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          repository: syncthing/release-tools
+          path: tools
+          fetch-depth: 0
+
+      - name: Download artifacts
+        uses: actions/download-artifact@v3
+        with:
+          name: packages-signed
+          path: packages
+
+      - name: Create release json
+        run: |
+          cd packages
+          "$GITHUB_WORKSPACE/tools/generate-release-json" "$BASE_URL" > nightly.json
+        env:
+          BASE_URL: https://syncthing.ams3.digitaloceanspaces.com/nightly/
+
+      - name: Push artifacts
+        uses: docker://docker.io/rclone/rclone:latest
+        env:
+          RCLONE_CONFIG_SPACES_TYPE: s3
+          RCLONE_CONFIG_SPACES_PROVIDER: DigitalOcean
+          RCLONE_CONFIG_SPACES_ACCESS_KEY_ID: ${{ secrets.SPACES_KEY }}
+          RCLONE_CONFIG_SPACES_SECRET_ACCESS_KEY: ${{ secrets.SPACES_SECRET }}
+          RCLONE_CONFIG_SPACES_ENDPOINT: ams3.digitaloceanspaces.com
+          RCLONE_CONFIG_SPACES_ACL: public-read
+        with:
+          args: sync packages spaces:syncthing/nightly
+
+  #
+  # Push release artifacts to Spaces
+  #
+
+  publish-release-files:
+    name: Publish release files
+    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && github.ref == 'refs/heads/release'
+    environment: signing
+    needs:
+      - sign-for-upgrade
+      - package-debian
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Download signed packages
+        uses: actions/download-artifact@v3
+        with:
+          name: packages-signed
+          path: packages
+
+      - name: Download debian packages
+        uses: actions/download-artifact@v3
+        with:
+          name: debian-packages
+          path: packages
+
+      - name: Set version
+        run: |
+          version=$(go run build.go version)
+          echo "VERSION=$version" >> $GITHUB_ENV
+
+      - name: Push to Spaces (${{ env.VERSION }})
+        uses: docker://docker.io/rclone/rclone:latest
+        env:
+          RCLONE_CONFIG_SPACES_TYPE: s3
+          RCLONE_CONFIG_SPACES_PROVIDER: DigitalOcean
+          RCLONE_CONFIG_SPACES_ACCESS_KEY_ID: ${{ secrets.SPACES_KEY }}
+          RCLONE_CONFIG_SPACES_SECRET_ACCESS_KEY: ${{ secrets.SPACES_SECRET }}
+          RCLONE_CONFIG_SPACES_ENDPOINT: ams3.digitaloceanspaces.com
+          RCLONE_CONFIG_SPACES_ACL: public-read
+        with:
+          args: sync packages spaces:syncthing/release/${{ env.VERSION }}
+
+      - name: Push to Spaces (latest)
+        uses: docker://docker.io/rclone/rclone:latest
+        env:
+          RCLONE_CONFIG_SPACES_TYPE: s3
+          RCLONE_CONFIG_SPACES_PROVIDER: DigitalOcean
+          RCLONE_CONFIG_SPACES_ACCESS_KEY_ID: ${{ secrets.SPACES_KEY }}
+          RCLONE_CONFIG_SPACES_SECRET_ACCESS_KEY: ${{ secrets.SPACES_SECRET }}
+          RCLONE_CONFIG_SPACES_ENDPOINT: ams3.digitaloceanspaces.com
+          RCLONE_CONFIG_SPACES_ACL: public-read
+        with:
+          args: sync spaces:syncthing/release/${{ env.VERSION }} spaces:syncthing/release/latest
+
+  #
+  # Build and push to Docker Hub
+  #
+
+  docker-syncthing:
+    name: Build and push Docker images
+    runs-on: ubuntu-latest
+    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && (github.ref == 'refs/heads/release' || github.ref == 'refs/heads/main' || github.ref == 'refs/heads/infrastructure' || startsWith(github.ref, 'refs/heads/release-'))
+    environment: docker
+    strategy:
+      matrix:
+        pkg:
+          - syncthing
+          - strelaysrv
+          - stdiscosrv
+        include:
+          - pkg: syncthing
+            dockerfile: Dockerfile
+            image: syncthing/syncthing
+          - pkg: strelaysrv
+            dockerfile: Dockerfile.strelaysrv
+            image: syncthing/relaysrv
+          - pkg: stdiscosrv
+            dockerfile: Dockerfile.stdiscosrv
+            image: syncthing/discosrv
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.GO_VERSION }}
+          cache: false
+          check-latest: true
+
+      - name: Get actual Go version
+        run: |
+          go version
+          echo "GO_VERSION=$(go version | sed 's#^.*go##;s# .*##')" >> $GITHUB_ENV
+
+      - uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cache/go-build
+            ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ env.GO_VERSION }}-docker-${{ matrix.pkg }}-${{ hashFiles('**/go.sum') }}
+
+      - name: Build binaries
+        run: |
+          for arch in amd64 arm64 arm; do
+            go run build.go -goos linux -goarch "$arch" -no-upgrade build ${{ matrix.pkg }}
+            mv ${{ matrix.pkg }} ${{ matrix.pkg }}-linux-"$arch"
+          done
+        env:
+          CGO_ENABLED: "0"
+          BUILD_USER: docker
+
+      - name: Check if we will be able to push images
+        run: |
+          if [[ "${{ secrets.DOCKERHUB_TOKEN }}" != "" ]]; then
+            echo "DOCKER_PUSH=true" >> $GITHUB_ENV;
+          fi
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        if: env.DOCKER_PUSH == 'true'
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Set version tags
+        run: |
+          version=$(go run build.go version)
+          version=${version#v}
+          if [[ $version == @([0-9]|[0-9][0-9]).@([0-9]|[0-9][0-9]).@([0-9]|[0-9][0-9]) ]] ; then
+            echo Release version, pushing to :latest and version tags
+            major=${version%.*.*}
+            minor=${version%.*}
+            tags=${{ matrix.image }}:$version,${{ matrix.image }}:$major,${{ matrix.image }}:$minor,${{ matrix.image }}:latest
+          elif [[ $version == *-rc.@([0-9]|[0-9][0-9]) ]] ; then
+            echo Release candidate, pushing to :rc
+            tags=${{ matrix.image }}:rc
+          else
+            echo Development version, pushing to :edge
+            tags=${{ matrix.image }}:edge
+          fi
+          echo "DOCKER_TAGS=$tags" >> $GITHUB_ENV
+          echo "VERSION=$version" >> $GITHUB_ENV
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ${{ matrix.dockerfile }}
+          platforms: linux/amd64,linux/arm64,linux/arm/7
+          push: ${{ env.DOCKER_PUSH == 'true' }}
+          tags: ${{ env.DOCKER_TAGS }}
+          labels: |
+            org.opencontainers.image.version=${{ env.VERSION }}
+            org.opencontainers.image.revision=${{ github.sha }}
+
+  #
+  # Check for known vulnerabilities in Go dependencies
+  #
+
+  govulncheck:
+    runs-on: ubuntu-latest
+    name: Run govulncheck
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.GO_VERSION }}
+          cache: false
+          check-latest: true
+
+      - name: run govulncheck
+        run: |
+          go run build.go assets
+          go install golang.org/x/vuln/cmd/govulncheck@latest
+          govulncheck ./...

.github/workflows/trigger-nightly.yaml

@@ -0,0 +1,21 @@
+name: Trigger nightly build & release
+on:
+  workflow_dispatch:
+  schedule:
+    # Run nightly build at 01:00 UTC
+    - cron: '00 01 * * *'
+
+jobs:
+
+  trigger-nightly:
+    runs-on: ubuntu-latest
+    name: Push to release-nightly to trigger build
+    steps:
+
+      - uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.ACTIONS_GITHUB_TOKEN }}
+          fetch-depth: 0
+
+      - run: |
+          git push origin main:release-nightly

.github/workflows/update-docs-translations.yaml

@@ -0,0 +1,28 @@
+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@v4
+        with:
+          fetch-depth: 0
+          token: ${{ secrets.ACTIONS_GITHUB_TOKEN }}
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ^1.19.6
+      - 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:
+          WEBLATE_TOKEN: ${{ secrets.WEBLATE_TOKEN }}

.gitignore

@@ -1,11 +1,10 @@
 /syncthing
 /stdiscosrv
-syncthing.exe
-stdiscosrv.exe
 *.tar.gz
 *.zip
 *.asc
 *.deb
+*.exe
 .jshintrc
 coverage.out
 files/pidx
@@ -19,4 +18,3 @@ deb
 /repos
 /proto/scripts/protoc-gen-gosyncthing
 /gui/next-gen-gui
-.idea

.yamlfmt

@@ -0,0 +1,4 @@
+line_ending: lf
+formatter:
+  type: basic
+  retain_line_breaks: true

AUTHORS

@@ -18,25 +18,33 @@ Adam Piggott (ProactiveServices) <aD@simplypeachy.co.uk> <simplypeachy@users.nor
 Adel Qalieh (adelq) <aqalieh95@gmail.com> <adelq@users.noreply.github.com>
 Alan Pope <alan@popey.com>
 Alberto Donato <albertodonato@users.noreply.github.com>
+Aleksey Vasenev <margtu-fivt@ya.ru>
 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>
+Alexander Seiler <seileralex@gmail.com>
+Alexandre Alves <alexandrealvesdb.contact@gmail.com>
 Alexandre Viau (aviau) <alexandre@alexandreviau.net> <aviau@debian.org>
 Aman Gupta <aman@tmm1.net>
+Anatoli Babenia <anatoli@rainforce.org>
 Anderson Mesquita (andersonvom) <andersonvom@gmail.com>
+Andreas Sommer <andreas.sommer87@googlemail.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>
 andyleap <andyleap@gmail.com>
 Anjan Momi <anjan@momi.ca>
+Anthony Goeckner <agoeckner@users.noreply.github.com>
 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>
@@ -61,55 +69,75 @@ 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>
+Catfriend1 <16361913+Catfriend1@users.noreply.github.com>
 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>
+Chih-Hsuan Yen <yan12125@gmail.com> <1937689+yan12125@users.noreply.github.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 Kujau <ckujau@users.noreply.github.com>
 Christian Prescott <me@christianprescott.com>
 chucic <chucic@seznam.cz>
+cjc7373 <niuchangcun@gmail.com>
 Colin Kennedy (moshen) <moshen.colin@gmail.com>
 Cromefire_ <tim.l@nghorst.net> <26320625+cromefire@users.noreply.github.com>
+cui fliter <imcusg@gmail.com>
 Cyprien Devillez <cypx@users.noreply.github.com>
+d-volution <49024624+d-volution@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>
+DeflateAwning <11021263+DeflateAwning@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> <49699333+dependabot[bot]@users.noreply.github.com>
 derekriemer <derek.riemer@colorado.edu>
+DerRockWolf <50499906+DerRockWolf@users.noreply.github.com>
 desbma <desbma@users.noreply.github.com>
+Devon G. Redekopp <devon@redekopp.com>
+digital <didev@dinid.net>
+Dimitri Papadopoulos Orfanos <3234522+DimitriPapadopoulos@users.noreply.github.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>
+Emil Lundberg <emil@emlun.se>
+Eng Zer Jun <engzerjun@gmail.com>
+entity0xfe <109791748+entity0xfe@users.noreply.github.com> <entity0xfe@my.domain>
 Eric Lesiuta <elesiuta@gmail.com>
+Eric P <eric@kastelo.net>
 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 <53702818+f-eliks@users.noreply.github.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 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>
+guangwu <guoguangwu@magic-shield.com>
+gudvinr <gudvinr@gmail.com>
 Han Boetes <han@boetes.org>
 HansK-p <42314815+HansK-p@users.noreply.github.com>
 Harrison Jones (harrisonhjones) <harrisonhjones@users.noreply.github.com>
@@ -117,6 +145,7 @@ 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>
@@ -126,12 +155,16 @@ Jack Croft <jccroft1@users.noreply.github.com>
 Jacob <jyundt@gmail.com>
 Jake Peterson (acogdev) <jake@acogdev.com>
 Jakob Borg (calmh) <jakob@nym.se> <jakob@kastelo.net>
+James O'Beirne <wild-github@au92.org>
 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>
+Jaya Kumar <jaya.kumar@ict.nl>
+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>
@@ -148,8 +181,11 @@ Jose Manuel Delicado (jmdaweb) <jmdaweb@hotmail.com> <jmdaweb@users.noreply.gith
 jtagcat <git-514635f7@jtag.cat> <git-12dbd862@jtag.cat>
 Jörg Thalheim <Mic92@users.noreply.github.com>
 Jędrzej Kula <kula.jedrek@gmail.com>
+K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
 Kalle Laine <pahakalle@protonmail.com>
 Karol Różycki (krozycki) <rozycki.karol@gmail.com>
+Kebin Liu <lkebin@gmail.com>
+Keith Harrison <keithh@protonmail.com>
 Keith Turner <kturner@apache.org>
 Kelong Cong (kc1212) <kc04bc@gmx.com> <kc1212@users.noreply.github.com>
 Ken'ichi Kamada (kamadak) <kamada@nanohz.org>
@@ -166,7 +202,9 @@ 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>
+luzpaz <luzpaz@users.noreply.github.com>
 Majed Abdulaziz (majedev) <majed.alhajry@gmail.com>
 Marc Laporte (marclaporte) <marc@marclaporte.com> <marc@laporte.name>
 Marc Pujol (kilburn) <kilburn@la3.org>
@@ -175,6 +213,8 @@ 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>
+Martin Polehla <p0l0us@users.noreply.github.com>
 Mateusz Naściszewski (mateon1) <matin1111@wp.pl>
 Mateusz Ż <thedead4fun@live.com>
 Matic Potočnik <hairyfotr@gmail.com>
@@ -186,19 +226,23 @@ 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>
+Maximilian <maxi.rostock@outlook.de> <public@complexvector.space>
 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>
+Migelo <miha@filetki.si>
 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>
+Nick Busey <NickBusey@users.noreply.github.com>
 Nico Stapelbroek <3368018+nstapelbroek@users.noreply.github.com>
 Nicolas Braud-Santoni <nicolas@braud-santoni.eu>
 Nicolas Perraut <n.perraut@gmail.com>
@@ -208,6 +252,7 @@ NinoM4ster <ninom4ster@gmail.com>
 Nitroretro <43112364+Nitroretro@users.noreply.github.com>
 NoLooseEnds <jon.koslung@gmail.com>
 Oliver Freyermuth <o.freyermuth@googlemail.com>
+orangekame3 <miya.org.0309@gmail.com>
 otbutz <tbutz@optitool.de>
 Otiel <Otiel@users.noreply.github.com>
 overkill <22098433+0verk1ll@users.noreply.github.com>
@@ -231,6 +276,7 @@ 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>
@@ -239,11 +285,14 @@ 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>
+Sertonix <83883937+Sertonix@users.noreply.github.com>
+Shaarad Dalvi <60266155+shaaraddalvi@users.noreply.github.com> <shdalv@microsoft.com>
 Simon Frei (imsodin) <freisim93@gmail.com>
 Simon Mwepu <simonmwepu@gmail.com>
 Sly_tom_cat <slytomcat@mail.ru>
@@ -251,6 +300,8 @@ 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>
@@ -265,11 +316,15 @@ Tully Robinson (tojrobinson) <tully@tojr.org>
 Tyler Brazier (tylerbrazier) <tyler@tylerbrazier.com>
 Tyler Kropp <kropptyler@gmail.com>
 Unrud (Unrud) <unrud@openaliasbox.org> <Unrud@users.noreply.github.com>
+vapatel2 <149737089+vapatel2@users.noreply.github.com>
 Veeti Paananen (veeti) <veeti.paananen@rojekti.fi>
 Victor Buinsky (buinsky) <vix_booja@tut.by>
+Vik <63919734+ViktorOn@users.noreply.github.com>
 Vil Brekin (Vilbrekin) <vilbrekin@gmail.com>
+villekalliomaki <53118179+villekalliomaki@users.noreply.github.com>
 Vladimir Rusinov <vrusinov@google.com> <vladimir.rusinov@gmail.com>
 wangguoliang <liangcszzu@163.com>
+Will Rouesnel <wrouesnel@wrouesnel.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>
@@ -278,3 +333,4 @@ 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>

CONTRIBUTING.md

@@ -24,10 +24,15 @@ too much information will never get you yelled at. :)
 ## Contributing Translations
 
 All translations are done via
-[Transifex](https://www.transifex.com/projects/p/syncthing/). If you
-wish to contribute to a translation, just head over there and sign up.
+[Weblate](https://hosted.weblate.org/projects/syncthing/). If you wish
+to contribute to a translation, just head over there and sign up.
 Before every release, the language resources are updated from the
-latest info on Transifex.
+latest info on Weblate.
+
+Note that the previously used service at
+[Transifex](https://www.transifex.com/projects/p/syncthing/) is being
+retired and we kindly ask you to sign up on Weblate for continued
+involvement.
 
 ## Contributing Code
 

Dockerfile

@@ -1,29 +1,57 @@
 ARG GOVERSION=latest
+
+#
+# Maybe build Syncthing. This is a bit ugly as we can't make an entire
+# section of the Dockerfile conditional, so we end up always pulling the
+# golang image as builder. Then we check if the executable we need already
+# exists (pre-built) otherwise we build it.
+#
+
 FROM golang:$GOVERSION AS builder
+ARG BUILD_USER
+ARG BUILD_HOST
+ARG TARGETARCH
 
 WORKDIR /src
 COPY . .
 
 ENV CGO_ENABLED=0
-ENV BUILD_HOST=syncthing.net
-ENV BUILD_USER=docker
-RUN rm -f syncthing && go run build.go -no-upgrade build syncthing
+RUN if [ ! -f syncthing-linux-$TARGETARCH ] ; then \
+    go run build.go -no-upgrade build syncthing ; \
+    mv syncthing syncthing-linux-$TARGETARCH ; \
+  fi
+
+#
+# The rest of the Dockerfile uses the binary from the builder, prebuilt or
+# not.
+#
 
 FROM alpine
+ARG TARGETARCH
+
+LABEL org.opencontainers.image.authors="The Syncthing Project" \
+      org.opencontainers.image.url="https://syncthing.net" \
+      org.opencontainers.image.documentation="https://docs.syncthing.net" \
+      org.opencontainers.image.source="https://github.com/syncthing/syncthing" \
+      org.opencontainers.image.vendor="The Syncthing Project" \
+      org.opencontainers.image.licenses="MPL-2.0" \
+      org.opencontainers.image.title="Syncthing"
 
 EXPOSE 8384 22000/tcp 22000/udp 21027/udp
 
 VOLUME ["/var/syncthing"]
 
-RUN apk add --no-cache ca-certificates su-exec tzdata
+RUN apk add --no-cache ca-certificates curl libcap su-exec tzdata
 
-COPY --from=builder /src/syncthing /bin/syncthing
+COPY --from=builder /src/syncthing-linux-$TARGETARCH /bin/syncthing
 COPY --from=builder /src/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
+  CMD curl -fkLsS -m 2 127.0.0.1:8384/rest/noauth/health | grep -o --color=never OK || exit 1
 
 ENV STGUIADDRESS=0.0.0.0:8384
-ENTRYPOINT ["/bin/entrypoint.sh", "/bin/syncthing", "-home", "/var/syncthing/config"]
+ENV STHOMEDIR=/var/syncthing/config
+RUN chmod 755 /bin/entrypoint.sh
+ENTRYPOINT ["/bin/entrypoint.sh", "/bin/syncthing"]

Dockerfile.builder

@@ -1,6 +1,14 @@
 ARG GOVERSION=latest
 FROM golang:$GOVERSION
 
+LABEL org.opencontainers.image.authors="The Syncthing Project" \
+      org.opencontainers.image.url="https://syncthing.net" \
+      org.opencontainers.image.documentation="https://docs.syncthing.net" \
+      org.opencontainers.image.source="https://github.com/syncthing/syncthing" \
+      org.opencontainers.image.vendor="The Syncthing Project" \
+      org.opencontainers.image.licenses="MPL-2.0" \
+      org.opencontainers.image.title="Syncthing Builder"
+
 # FPM to build Debian packages
 RUN apt-get update && apt-get install -y --no-install-recommends \
 	locales rubygems ruby-dev build-essential git \

Dockerfile.buildx

@@ -1,19 +0,0 @@
-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"]

Dockerfile.stcrashreceiver

@@ -0,0 +1,16 @@
+FROM alpine
+ARG TARGETARCH
+
+LABEL org.opencontainers.image.authors="The Syncthing Project" \
+      org.opencontainers.image.url="https://syncthing.net" \
+      org.opencontainers.image.documentation="https://docs.syncthing.net" \
+      org.opencontainers.image.source="https://github.com/syncthing/syncthing" \
+      org.opencontainers.image.vendor="The Syncthing Project" \
+      org.opencontainers.image.licenses="MPL-2.0" \
+      org.opencontainers.image.title="Syncthing Crash Receiver"
+
+EXPOSE 8080
+
+COPY stcrashreceiver-linux-${TARGETARCH} /bin/stcrashreceiver
+
+ENTRYPOINT [ "/bin/stcrashreceiver" ]

Dockerfile.stdiscosrv

@@ -1,15 +1,28 @@
 ARG GOVERSION=latest
 FROM golang:$GOVERSION AS builder
+ARG BUILD_USER
+ARG BUILD_HOST
+ARG TARGETARCH
 
 WORKDIR /src
 COPY . .
 
 ENV CGO_ENABLED=0
-ENV BUILD_HOST=syncthing.net
-ENV BUILD_USER=docker
-RUN rm -f stdiscosrv && go run build.go -no-upgrade build stdiscosrv
+RUN if [ ! -f stdiscosrv-linux-$TARGETARCH ] ; then \
+    go run build.go -no-upgrade build stdiscosrv ; \
+    mv stdiscosrv stdiscosrv-linux-$TARGETARCH ; \
+  fi
 
 FROM alpine
+ARG TARGETARCH
+
+LABEL org.opencontainers.image.authors="The Syncthing Project" \
+      org.opencontainers.image.url="https://syncthing.net" \
+      org.opencontainers.image.documentation="https://docs.syncthing.net" \
+      org.opencontainers.image.source="https://github.com/syncthing/syncthing" \
+      org.opencontainers.image.vendor="The Syncthing Project" \
+      org.opencontainers.image.licenses="MPL-2.0" \
+      org.opencontainers.image.title="Syncthing Discovery Server"
 
 EXPOSE 19200 8443
 
@@ -17,7 +30,7 @@ VOLUME ["/var/stdiscosrv"]
 
 RUN apk add --no-cache ca-certificates su-exec
 
-COPY --from=builder /src/stdiscosrv /bin/stdiscosrv
+COPY --from=builder /src/stdiscosrv-linux-$TARGETARCH /bin/stdiscosrv
 COPY --from=builder /src/script/docker-entrypoint.sh /bin/entrypoint.sh
 
 ENV PUID=1000 PGID=1000 HOME=/var/stdiscosrv

Dockerfile.strelaypoolsrv

@@ -0,0 +1,24 @@
+FROM alpine
+ARG TARGETARCH
+
+LABEL org.opencontainers.image.authors="The Syncthing Project" \
+      org.opencontainers.image.url="https://syncthing.net" \
+      org.opencontainers.image.documentation="https://docs.syncthing.net" \
+      org.opencontainers.image.source="https://github.com/syncthing/syncthing" \
+      org.opencontainers.image.vendor="The Syncthing Project" \
+      org.opencontainers.image.licenses="MPL-2.0" \
+      org.opencontainers.image.title="Syncthing Relay Pool Server"
+
+EXPOSE 8080
+
+RUN apk add --no-cache ca-certificates su-exec curl
+ENV PUID=1000 PGID=1000 MAXMIND_KEY=
+
+RUN mkdir /var/strelaypoolsrv && chown 1000 /var/strelaypoolsrv
+USER 1000
+
+COPY strelaypoolsrv-linux-${TARGETARCH} /bin/strelaypoolsrv
+COPY script/strelaypoolsrv-entrypoint.sh /bin/entrypoint.sh
+
+WORKDIR /var/strelaypoolsrv
+ENTRYPOINT ["/bin/entrypoint.sh", "/bin/strelaypoolsrv", "-listen", ":8080"]

Dockerfile.strelaysrv

@@ -1,15 +1,28 @@
 ARG GOVERSION=latest
 FROM golang:$GOVERSION AS builder
+ARG BUILD_USER
+ARG BUILD_HOST
+ARG TARGETARCH
 
 WORKDIR /src
 COPY . .
 
 ENV CGO_ENABLED=0
-ENV BUILD_HOST=syncthing.net
-ENV BUILD_USER=docker
-RUN rm -f strelaysrv && go run build.go -no-upgrade build strelaysrv
+RUN if [ ! -f strelaysrv-linux-$TARGETARCH ] ; then \
+    go run build.go -no-upgrade build strelaysrv ; \
+    mv strelaysrv strelaysrv-linux-$TARGETARCH ; \
+  fi
 
 FROM alpine
+ARG TARGETARCH
+
+LABEL org.opencontainers.image.authors="The Syncthing Project" \
+      org.opencontainers.image.url="https://syncthing.net" \
+      org.opencontainers.image.documentation="https://docs.syncthing.net" \
+      org.opencontainers.image.source="https://github.com/syncthing/syncthing" \
+      org.opencontainers.image.vendor="The Syncthing Project" \
+      org.opencontainers.image.licenses="MPL-2.0" \
+      org.opencontainers.image.title="Syncthing Relay Server"
 
 EXPOSE 22067 22070
 
@@ -17,7 +30,7 @@ VOLUME ["/var/strelaysrv"]
 
 RUN apk add --no-cache ca-certificates su-exec
 
-COPY --from=builder /src/strelaysrv /bin/strelaysrv
+COPY --from=builder /src/strelaysrv-linux-$TARGETARCH /bin/strelaysrv
 COPY --from=builder /src/script/docker-entrypoint.sh /bin/entrypoint.sh
 
 ENV PUID=1000 PGID=1000 HOME=/var/strelaysrv

Dockerfile.stupgrades

@@ -0,0 +1,16 @@
+FROM alpine
+ARG TARGETARCH
+
+LABEL org.opencontainers.image.authors="The Syncthing Project" \
+      org.opencontainers.image.url="https://syncthing.net" \
+      org.opencontainers.image.documentation="https://docs.syncthing.net" \
+      org.opencontainers.image.source="https://github.com/syncthing/syncthing" \
+      org.opencontainers.image.vendor="The Syncthing Project" \
+      org.opencontainers.image.licenses="MPL-2.0" \
+      org.opencontainers.image.title="Syncthing Upgrades"
+
+EXPOSE 8080
+
+COPY stupgrades-linux-${TARGETARCH} /bin/stupgrades
+
+ENTRYPOINT [ "/bin/stupgrades" ]

Dockerfile.ursrv

@@ -0,0 +1,16 @@
+FROM alpine
+ARG TARGETARCH
+
+LABEL org.opencontainers.image.authors="The Syncthing Project" \
+      org.opencontainers.image.url="https://syncthing.net" \
+      org.opencontainers.image.documentation="https://docs.syncthing.net" \
+      org.opencontainers.image.source="https://github.com/syncthing/syncthing" \
+      org.opencontainers.image.vendor="The Syncthing Project" \
+      org.opencontainers.image.licenses="MPL-2.0" \
+      org.opencontainers.image.title="Syncthing Usage Reporting Server"
+
+EXPOSE 8080
+
+COPY ursrv-linux-${TARGETARCH} /bin/ursrv
+
+ENTRYPOINT [ "/bin/ursrv" ]

GOALS.md

@@ -24,17 +24,17 @@ to avoid corrupting the user's files.
 ### 2. Secure Against Attackers
 
 Again, protecting the user's data is paramount. Regardless of our other
-goals we must never allow the user's data to be susceptible to eavesdropping
+goals, we must never allow the user's data to be susceptible to eavesdropping
 or modification by unauthorized parties.
 
 > This should be understood in context. It is not necessarily reasonable to
 > expect Syncthing to be resistant against well equipped state level
-> attackers. We will however do our best. Note also that this is different
+> attackers. We will, however, do our best. Note also that this is different
 > from anonymity which is not, currently, a goal.
 
 ### 3. Easy to Use
 
-Syncthing should be approachable, understandable and inclusive.
+Syncthing should be approachable, understandable, and inclusive.
 
 > Complex concepts and maths form the base of Syncthing's functionality.
 > This should nonetheless be abstracted or hidden to a degree where
@@ -52,18 +52,18 @@ User interaction should be required only when absolutely necessary.
 ### 5. Universally Available
 
 Syncthing should run on every common computer. We are mindful that the
-latest technology is not always available to any given individual.
+latest technology is not always available to every individual.
 
 > Computers include desktops, laptops, servers, virtual machines, small
 > general purpose computers such as Raspberry Pis and, *where possible*,
-> tablets and phones. NAS appliances, toasters, cars, firearms, thermostats
-> and so on may include computing capabitilies but it is not our goal for
+> tablets and phones. NAS appliances, toasters, cars, firearms, thermostats,
+> and so on may include computing capabilities but it is not our goal for
 > Syncthing to run smoothly on these devices.
 
 ### 6. For Individuals
 
 Syncthing is primarily about empowering the individual user with safe,
-secure and easy to use file synchronization.
+secure, and easy to use file synchronization.
 
 > We acknowledge that it's also useful in an enterprise setting and include
 > functionality to support that. If this is in conflict with the

README-Docker.md

@@ -7,23 +7,27 @@ 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. In addition
+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.
+`--hostname=syncthing` parameter.
+
+To grant Syncthing additional capabilities without running as root, use the
+`PCAP` environment variable with the same syntax as that for `setcap(8)`.
+For example, `PCAP=cap_chown,cap_fowner+ep`.
 
 ## Example Usage
 
 **Docker cli**
 ```
 $ docker pull syncthing/syncthing
-$ docker run -p 8384:8384 -p 22000:22000/tcp -p 22000:22000/udp \
+$ 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:
@@ -37,20 +41,23 @@ services:
     volumes:
       - /wherever/st-sync:/var/syncthing
     ports:
-      - 8384:8384
-      - 22000:22000/tcp
-      - 22000:22000/udp
+      - 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 \
@@ -58,6 +65,24 @@ $ 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.

README.md

@@ -2,9 +2,6 @@
 
 ---
 
-[![Latest Linux & Cross Build](https://img.shields.io/teamcity/https/build.syncthing.net/s/Syncthing_BuildLinuxCross.svg?style=flat-square&label=linux+%26+cross+build)](https://build.syncthing.net/viewType.html?buildTypeId=Syncthing_BuildLinuxCross&guest=1)
-[![Latest Windows Build](https://img.shields.io/teamcity/https/build.syncthing.net/s/Syncthing_BuildWindows.svg?style=flat-square&label=windows+build)](https://build.syncthing.net/viewType.html?buildTypeId=Syncthing_BuildWindows&guest=1)
-[![Latest Mac Build](https://img.shields.io/teamcity/https/build.syncthing.net/s/Syncthing_BuildMac.svg?style=flat-square&label=mac+build)](https://build.syncthing.net/viewType.html?buildTypeId=Syncthing_BuildMac&guest=1)
 [![MPLv2 License](https://img.shields.io/badge/license-MPLv2-blue.svg?style=flat-square)](https://www.mozilla.org/MPL/2.0/)
 [![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/88/badge)](https://bestpractices.coreinfrastructure.org/projects/88)
 [![Go Report Card](https://goreportcard.com/badge/github.com/syncthing/syncthing)](https://goreportcard.com/report/github.com/syncthing/syncthing)
@@ -13,8 +10,8 @@
 
 Syncthing is a **continuous file synchronization program**. It synchronizes
 files between two or more computers. We strive to fulfill the goals below.
-The goals are listed in order of importance, the most important one being
-the first. This is the summary version of the goal list - for more
+The goals are listed in order of importance, the most important ones first.
+This is the summary version of the goal list - for more
 commentary, see the full [Goals document][13].
 
 Syncthing should be:
@@ -27,12 +24,12 @@ Syncthing should be:
 2. **Secure Against Attackers**
 
    Again, protecting the user's data is paramount. Regardless of our other
-   goals we must never allow the user's data to be susceptible to
+   goals, we must never allow the user's data to be susceptible to
    eavesdropping or modification by unauthorized parties.
 
 3. **Easy to Use**
 
-   Syncthing should be approachable, understandable and inclusive.
+   Syncthing should be approachable, understandable, and inclusive.
 
 4. **Automatic**
 
@@ -41,12 +38,12 @@ Syncthing should be:
 5. **Universally Available**
 
    Syncthing should run on every common computer. We are mindful that the
-   latest technology is not always available to any given individual.
+   latest technology is not always available to every individual.
 
 6. **For Individuals**
 
    Syncthing is primarily about empowering the individual user with safe,
-   secure and easy to use file synchronization.
+   secure, and easy to use file synchronization.
 
 7. **Everything Else**
 
@@ -60,7 +57,7 @@ Take a look at the [getting started guide][2].
 
 There are a few examples for keeping Syncthing running in the background
 on your system in [the etc directory][3]. There are also several [GUI
-implementations][11] for Windows, Mac and Linux.
+implementations][11] for Windows, Mac, and Linux.
 
 ## Docker
 
@@ -69,7 +66,8 @@ To run Syncthing in Docker, see [the Docker README][16].
 ## Vote on features/bugs
 
 We'd like to encourage you to [vote][12] on issues that matter to you.
-This helps the team understand what are the biggest pain points for our users, and could potentially influence what is being worked on next.
+This helps the team understand what are the biggest pain points for our
+users, and could potentially influence what is being worked on next.
 
 ## Getting in Touch
 
@@ -77,18 +75,24 @@ 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].
 
+If you believe that you’ve found a Syncthing-related security vulnerability,
+please report it by emailing security@syncthing.net. Do not report it in the
+Forum or issue tracker.
+
 ## 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
 
-As of v0.10.15 and onwards release binaries are GPG signed with the key
+As of v0.10.15 and onwards, release binaries are GPG signed with the key
 D26E6ED000654A3E, available from https://syncthing.net/security.html and
 most key servers.
 
-There is also a built in automatic upgrade mechanism (disabled in some
+There is also a built-in automatic upgrade mechanism (disabled in some
 distribution channels) which uses a compiled in ECDSA signature. macOS
 binaries are also properly code signed.
 
@@ -112,4 +116,4 @@ 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
+[17]: https://github.com/syncthing/docs

build.go

@@ -15,6 +15,7 @@ import (
 	"bytes"
 	"compress/flate"
 	"compress/gzip"
+	"encoding/base64"
 	"encoding/json"
 	"errors"
 	"flag"
@@ -31,6 +32,8 @@ import (
 	"strings"
 	"text/template"
 	"time"
+
+	buildpkg "github.com/syncthing/syncthing/lib/build"
 )
 
 var (
@@ -47,6 +50,7 @@ var (
 	cc             string
 	run            string
 	benchRun       string
+	buildOut       string
 	debugBinary    bool
 	coverage       bool
 	long           bool
@@ -203,6 +207,24 @@ var targets = map[string]target{
 			{src: "AUTHORS", dst: "deb/usr/share/doc/syncthing-relaypoolsrv/AUTHORS.txt", perm: 0644},
 		},
 	},
+	"stupgrades": {
+		name:        "stupgrades",
+		description: "Syncthing Upgrade Check Server",
+		buildPkgs:   []string{"github.com/syncthing/syncthing/cmd/stupgrades"},
+		binaryName:  "stupgrades",
+	},
+	"stcrashreceiver": {
+		name:        "stcrashreceiver",
+		description: "Syncthing Crash Server",
+		buildPkgs:   []string{"github.com/syncthing/syncthing/cmd/stcrashreceiver"},
+		binaryName:  "stcrashreceiver",
+	},
+	"ursrv": {
+		name:        "ursrv",
+		description: "Syncthing Usage Reporting Server",
+		buildPkgs:   []string{"github.com/syncthing/syncthing/cmd/ursrv"},
+		binaryName:  "ursrv",
+	},
 }
 
 func initTargets() {
@@ -316,6 +338,9 @@ func runCommand(cmd string, target target) {
 	case "transifex":
 		transifex()
 
+	case "weblate":
+		weblate()
+
 	case "tar":
 		buildTar(target, tags)
 
@@ -374,6 +399,7 @@ func parseFlags() {
 	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()
 }
 
@@ -391,7 +417,7 @@ func test(tags []string, pkgs ...string) {
 
 	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")
 		}
 	}
@@ -506,6 +532,9 @@ 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...)
 }
@@ -877,8 +906,20 @@ func shouldRebuildAssets(target, srcdir string) bool {
 }
 
 func updateDependencies() {
-	runPrint(goCmd, "get", "-u", "./cmd/...")
-	runPrint(goCmd, "mod", "tidy", "-go=1.16", "-compat=1.16")
+	// Figure out desired Go version
+	bs, err := os.ReadFile("go.mod")
+	if err != nil {
+		log.Fatal(err)
+	}
+	re := regexp.MustCompile(`(?m)^go\s+([0-9.]+)`)
+	matches := re.FindSubmatch(bs)
+	if len(matches) != 2 {
+		log.Fatal("failed to parse go.mod")
+	}
+	goVersion := string(matches[1])
+
+	runPrint(goCmd, "get", "-u", "./...")
+	runPrint(goCmd, "mod", "tidy", "-go="+goVersion, "-compat="+goVersion)
 
 	// We might have updated the protobuf package and should regenerate to match.
 	proto()
@@ -933,6 +974,11 @@ func transifex() {
 	runPrint(goCmd, "run", "../../../../script/transifexdl.go")
 }
 
+func weblate() {
+	os.Chdir("gui/default/assets/lang")
+	runPrint(goCmd, "run", "../../../../script/weblatedl.go")
+}
+
 func ldflags(tags []string) string {
 	b := new(strings.Builder)
 	b.WriteString("-w")
@@ -980,7 +1026,7 @@ func getGitVersion() (string, error) {
 	v0 := string(bs)
 
 	// To be more semantic-versionish and ensure proper ordering in our
-	// upgrade process, we make sure there's only one hypen in the version.
+	// 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 {
@@ -1068,10 +1114,14 @@ func getBranchSuffix() string {
 
 	branch = parts[len(parts)-1]
 	switch branch {
-	case "master", "release", "main":
+	case "release", "main":
 		// these are not special
 		return ""
 	}
+	if strings.HasPrefix(branch, "release-") {
+		// release branches are not special
+		return ""
+	}
 
 	validBranchRe := regexp.MustCompile(`^[a-zA-Z0-9_.-]+$`)
 	if !validBranchRe.MatchString(branch) {
@@ -1364,6 +1414,33 @@ func windowsCodesign(file string) {
 		args := []string{"sign", "/fd", algo}
 		if f := os.Getenv("CODESIGN_CERTIFICATE_FILE"); f != "" {
 			args = append(args, "/f", f)
+		} else if b := os.Getenv("CODESIGN_CERTIFICATE_BASE64"); b != "" {
+			// Decode the PFX certificate from base64.
+			bs, err := base64.RawStdEncoding.DecodeString(b)
+			if err != nil {
+				log.Println("Codesign: signing failed: decoding base64:", err)
+				return
+			}
+
+			// Write it to a temporary file
+			f, err := os.CreateTemp("", "codesign-*.pfx")
+			if err != nil {
+				log.Println("Codesign: signing failed: creating temp file:", err)
+				return
+			}
+			_ = f.Chmod(0600) // best effort remove other users' access
+			defer os.Remove(f.Name())
+			if _, err := f.Write(bs); err != nil {
+				log.Println("Codesign: signing failed: writing temp file:", err)
+				return
+			}
+			if err := f.Close(); err != nil {
+				log.Println("Codesign: signing failed: closing temp file:", err)
+				return
+			}
+
+			// Use that when signing
+			args = append(args, "/f", f.Name())
 		}
 		if p := os.Getenv("CODESIGN_CERTIFICATE_PASSWORD"); p != "" {
 			args = append(args, "/p", p)
@@ -1383,7 +1460,7 @@ func windowsCodesign(file string) {
 
 		bs, err := runError(st, args...)
 		if err != nil {
-			log.Println("Codesign: signing failed:", string(bs))
+			log.Printf("Codesign: signing failed: %v: %s", err, string(bs))
 			return
 		}
 		log.Println("Codesign: successfully signed", file, "using", algo)

build.sh

@@ -23,7 +23,7 @@ case "${1:-default}" in
 
 	prerelease)
 		script authors
-		build transifex
+		build weblate
 		pushd man ; ./refresh.sh ; popd
 		git add -A gui man AUTHORS
 		git commit -m 'gui, man, authors: Update docs, translations, and contributors'

cmd/stcrashreceiver/diskstore.go

@@ -0,0 +1,198 @@
+// Copyright (C) 2023 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"
+	"context"
+	"io"
+	"log"
+	"math"
+	"os"
+	"path/filepath"
+	"sort"
+	"time"
+)
+
+type diskStore struct {
+	dir      string
+	inbox    chan diskEntry
+	maxBytes int64
+	maxFiles int
+
+	currentFiles []currentFile
+	currentSize  int64
+}
+
+type diskEntry struct {
+	path string
+	data []byte
+}
+
+type currentFile struct {
+	path  string
+	size  int64
+	mtime int64
+}
+
+func (d *diskStore) Serve(ctx context.Context) {
+	if err := os.MkdirAll(d.dir, 0o700); err != nil {
+		log.Println("Creating directory:", err)
+		return
+	}
+
+	if err := d.inventory(); err != nil {
+		log.Println("Failed to inventory disk store:", err)
+	}
+	d.clean()
+
+	cleanTimer := time.NewTicker(time.Minute)
+	inventoryTimer := time.NewTicker(24 * time.Hour)
+
+	buf := new(bytes.Buffer)
+	gw := gzip.NewWriter(buf)
+	for {
+		select {
+		case entry := <-d.inbox:
+			path := d.fullPath(entry.path)
+
+			if err := os.MkdirAll(filepath.Dir(path), 0o700); err != nil {
+				log.Println("Creating directory:", err)
+				continue
+			}
+
+			buf.Reset()
+			gw.Reset(buf)
+			if _, err := gw.Write(entry.data); err != nil {
+				log.Println("Failed to compress crash report:", err)
+				continue
+			}
+			if err := gw.Close(); err != nil {
+				log.Println("Failed to compress crash report:", err)
+				continue
+			}
+			if err := os.WriteFile(path, buf.Bytes(), 0o600); err != nil {
+				log.Printf("Failed to write %s: %v", entry.path, err)
+				_ = os.Remove(path)
+				continue
+			}
+
+			d.currentSize += int64(buf.Len())
+			d.currentFiles = append(d.currentFiles, currentFile{
+				size: int64(len(entry.data)),
+				path: path,
+			})
+
+		case <-cleanTimer.C:
+			d.clean()
+
+		case <-inventoryTimer.C:
+			if err := d.inventory(); err != nil {
+				log.Println("Failed to inventory disk store:", err)
+			}
+
+		case <-ctx.Done():
+			return
+		}
+	}
+}
+
+func (d *diskStore) Put(path string, data []byte) bool {
+	select {
+	case d.inbox <- diskEntry{
+		path: path,
+		data: data,
+	}:
+		return true
+	default:
+		return false
+	}
+}
+
+func (d *diskStore) Get(path string) ([]byte, error) {
+	path = d.fullPath(path)
+	bs, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+	gr, err := gzip.NewReader(bytes.NewReader(bs))
+	if err != nil {
+		return nil, err
+	}
+	defer gr.Close()
+	return io.ReadAll(gr)
+}
+
+func (d *diskStore) Exists(path string) bool {
+	path = d.fullPath(path)
+	_, err := os.Lstat(path)
+	return err == nil
+}
+
+func (d *diskStore) clean() {
+	for len(d.currentFiles) > 0 && (len(d.currentFiles) > d.maxFiles || d.currentSize > d.maxBytes) {
+		f := d.currentFiles[0]
+		log.Println("Removing", f.path)
+		if err := os.Remove(f.path); err != nil {
+			log.Println("Failed to remove file:", err)
+		}
+		d.currentFiles = d.currentFiles[1:]
+		d.currentSize -= f.size
+	}
+	var oldest time.Duration
+	if len(d.currentFiles) > 0 {
+		oldest = time.Since(time.Unix(d.currentFiles[0].mtime, 0)).Truncate(time.Minute)
+	}
+
+	metricDiskstoreFilesTotal.Set(float64(len(d.currentFiles)))
+	metricDiskstoreBytesTotal.Set(float64(d.currentSize))
+	metricDiskstoreOldestAgeSeconds.Set(math.Round(oldest.Seconds()))
+
+	log.Printf("Clean complete: %d files, %d MB, oldest is %v ago", len(d.currentFiles), d.currentSize>>20, oldest)
+}
+
+func (d *diskStore) inventory() error {
+	d.currentFiles = nil
+	d.currentSize = 0
+	err := filepath.Walk(d.dir, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if info.IsDir() {
+			return nil
+		}
+		if filepath.Ext(path) != ".gz" {
+			return nil
+		}
+		d.currentSize += info.Size()
+		d.currentFiles = append(d.currentFiles, currentFile{
+			path:  path,
+			size:  info.Size(),
+			mtime: info.ModTime().Unix(),
+		})
+		return nil
+	})
+	sort.Slice(d.currentFiles, func(i, j int) bool {
+		return d.currentFiles[i].mtime < d.currentFiles[j].mtime
+	})
+	var oldest time.Duration
+	if len(d.currentFiles) > 0 {
+		oldest = time.Since(time.Unix(d.currentFiles[0].mtime, 0)).Truncate(time.Minute)
+	}
+
+	metricDiskstoreFilesTotal.Set(float64(len(d.currentFiles)))
+	metricDiskstoreBytesTotal.Set(float64(d.currentSize))
+	metricDiskstoreOldestAgeSeconds.Set(math.Round(oldest.Seconds()))
+
+	log.Printf("Inventory complete: %d files, %d MB, oldest is %v ago", len(d.currentFiles), d.currentSize>>20, oldest)
+	return err
+}
+
+func (d *diskStore) fullPath(path string) string {
+	return filepath.Join(d.dir, path[0:2], path[2:]) + ".gz"
+}

cmd/stcrashreceiver/main.go

@@ -13,8 +13,8 @@
 package main
 
 import (
+	"context"
 	"encoding/json"
-	"flag"
 	"fmt"
 	"io"
 	"log"
@@ -22,6 +22,8 @@ import (
 	"os"
 	"path/filepath"
 
+	"github.com/alecthomas/kong"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/syncthing/syncthing/lib/sha256"
 	"github.com/syncthing/syncthing/lib/ur"
 
@@ -30,32 +32,64 @@ import (
 
 const maxRequestSize = 1 << 20 // 1 MiB
 
+type cli struct {
+	Dir           string `help:"Parent directory to store crash and failure reports in" env:"REPORTS_DIR" default:"."`
+	DSN           string `help:"Sentry DSN" env:"SENTRY_DSN"`
+	Listen        string `help:"HTTP listen address" default:":8080" env:"LISTEN_ADDRESS"`
+	MaxDiskFiles  int    `help:"Maximum number of reports on disk" default:"100000" env:"MAX_DISK_FILES"`
+	MaxDiskSizeMB int64  `help:"Maximum disk space to use for reports" default:"1024" env:"MAX_DISK_SIZE_MB"`
+	SentryQueue   int    `help:"Maximum number of reports to queue for sending to Sentry" default:"64" env:"SENTRY_QUEUE"`
+	DiskQueue     int    `help:"Maximum number of reports to queue for writing to disk" default:"64" env:"DISK_QUEUE"`
+}
+
 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()
+	var params cli
+	kong.Parse(&params)
 
 	mux := http.NewServeMux()
 
-	cr := &crashReceiver{
-		dir: filepath.Join(*dir, "crash_reports"),
-		dsn: *dsn,
+	ds := &diskStore{
+		dir:      filepath.Join(params.Dir, "crash_reports"),
+		inbox:    make(chan diskEntry, params.DiskQueue),
+		maxFiles: params.MaxDiskFiles,
+		maxBytes: params.MaxDiskSizeMB << 20,
 	}
-	mux.Handle("/", cr)
+	go ds.Serve(context.Background())
 
-	if *dsn != "" {
-		mux.HandleFunc("/newcrash/failure", handleFailureFn(*dsn, filepath.Join(*dir, "failure_reports")))
+	ss := &sentryService{
+		dsn:   params.DSN,
+		inbox: make(chan sentryRequest, params.SentryQueue),
+	}
+	go ss.Serve(context.Background())
+
+	cr := &crashReceiver{
+		store:  ds,
+		sentry: ss,
+	}
+
+	mux.Handle("/", cr)
+	mux.HandleFunc("/ping", func(w http.ResponseWriter, req *http.Request) {
+		w.Write([]byte("OK"))
+	})
+	mux.Handle("/metrics", promhttp.Handler())
+
+	if params.DSN != "" {
+		mux.HandleFunc("/newcrash/failure", handleFailureFn(params.DSN, filepath.Join(params.Dir, "failure_reports")))
 	}
 
 	log.SetOutput(os.Stdout)
-	if err := http.ListenAndServe(*listen, mux); err != nil {
+	if err := http.ListenAndServe(params.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) {
+		result := "failure"
+		defer func() {
+			metricFailureReportsTotal.WithLabelValues(result).Inc()
+		}()
+
 		lr := io.LimitReader(req.Body, maxRequestSize)
 		bs, err := io.ReadAll(lr)
 		req.Body.Close()
@@ -90,7 +124,7 @@ func handleFailureFn(dsn, failureDir string) func(w http.ResponseWriter, req *ht
 			for k, v := range r.Extra {
 				pkt.Extra[k] = v
 			}
-			if len(r.Goroutines) != 0 {
+			if r.Goroutines != "" {
 				url, err := saveFailureWithGoroutines(r.FailureData, failureDir)
 				if err != nil {
 					log.Println("Saving failure report:", err)
@@ -106,6 +140,7 @@ func handleFailureFn(dsn, failureDir string) func(w http.ResponseWriter, req *ht
 				log.Println("Failed to send failure report:", err)
 			} else {
 				log.Println("Sent failure report:", r.Description)
+				result = "success"
 			}
 		}
 	}

cmd/stcrashreceiver/metrics.go

@@ -0,0 +1,40 @@
+// Copyright (C) 2023 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 (
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+)
+
+var (
+	metricCrashReportsTotal = promauto.NewCounterVec(prometheus.CounterOpts{
+		Namespace: "syncthing",
+		Subsystem: "crashreceiver",
+		Name:      "crash_reports_total",
+	}, []string{"result"})
+	metricFailureReportsTotal = promauto.NewCounterVec(prometheus.CounterOpts{
+		Namespace: "syncthing",
+		Subsystem: "crashreceiver",
+		Name:      "failure_reports_total",
+	}, []string{"result"})
+	metricDiskstoreFilesTotal = promauto.NewGauge(prometheus.GaugeOpts{
+		Namespace: "syncthing",
+		Subsystem: "crashreceiver",
+		Name:      "diskstore_files_total",
+	})
+	metricDiskstoreBytesTotal = promauto.NewGauge(prometheus.GaugeOpts{
+		Namespace: "syncthing",
+		Subsystem: "crashreceiver",
+		Name:      "diskstore_bytes_total",
+	})
+	metricDiskstoreOldestAgeSeconds = promauto.NewGauge(prometheus.GaugeOpts{
+		Namespace: "syncthing",
+		Subsystem: "crashreceiver",
+		Name:      "diskstore_oldest_age_seconds",
+	})
+)

cmd/stcrashreceiver/sentry.go

@@ -8,14 +8,16 @@ package main
 
 import (
 	"bytes"
+	"context"
 	"errors"
 	"io"
+	"log"
 	"regexp"
 	"strings"
 	"sync"
 
 	raven "github.com/getsentry/raven-go"
-	"github.com/maruel/panicparse/stack"
+	"github.com/maruel/panicparse/v2/stack"
 )
 
 const reportServer = "https://crash.syncthing.net/report/"
@@ -31,6 +33,45 @@ var (
 	clientsMut sync.Mutex
 )
 
+type sentryService struct {
+	dsn   string
+	inbox chan sentryRequest
+}
+
+type sentryRequest struct {
+	reportID string
+	userID   string
+	data     []byte
+}
+
+func (s *sentryService) Serve(ctx context.Context) {
+	for {
+		select {
+		case req := <-s.inbox:
+			pkt, err := parseCrashReport(req.reportID, req.data)
+			if err != nil {
+				log.Println("Failed to parse crash report:", err)
+				continue
+			}
+			if err := sendReport(s.dsn, pkt, req.userID); err != nil {
+				log.Println("Failed to send crash report:", err)
+			}
+
+		case <-ctx.Done():
+			return
+		}
+	}
+}
+
+func (s *sentryService) Send(reportID, userID string, data []byte) bool {
+	select {
+	case s.inbox <- sentryRequest{reportID, userID, data}:
+		return true
+	default:
+		return false
+	}
+}
+
 func sendReport(dsn string, pkt *raven.Packet, userID string) error {
 	pkt.Interfaces = append(pkt.Interfaces, &raven.User{ID: userID})
 
@@ -93,10 +134,13 @@ func parseCrashReport(path string, report []byte) (*raven.Packet, error) {
 	}
 
 	r := bytes.NewReader(report)
-	ctx, err := stack.ParseDump(r, io.Discard, false)
-	if err != nil {
+	ctx, _, err := stack.ScanSnapshot(r, io.Discard, stack.DefaultOpts())
+	if err != nil && err != io.EOF {
 		return nil, err
 	}
+	if ctx == nil || len(ctx.Goroutines) == 0 {
+		return nil, errors.New("no goroutines found")
+	}
 
 	// Lock the source code loader to the version we are processing here.
 	if version.commit != "" {
@@ -116,7 +160,7 @@ func parseCrashReport(path string, report []byte) (*raven.Packet, error) {
 		if gr.First {
 			trace.Frames = make([]*raven.StacktraceFrame, len(gr.Stack.Calls))
 			for i, sc := range gr.Stack.Calls {
-				trace.Frames[len(trace.Frames)-1-i] = raven.NewStacktraceFrame(0, sc.Func.Name(), sc.SrcPath, sc.Line, 3, nil)
+				trace.Frames[len(trace.Frames)-1-i] = raven.NewStacktraceFrame(0, sc.Func.Name, sc.RemoteSrcPath, sc.Line, 3, nil)
 			}
 			break
 		}
@@ -172,7 +216,13 @@ func crashReportFingerprint(message string) []string {
 }
 
 // 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]+)[^\[]*(?:\[(.+)\])?$`)
+// or, somewhere along the way the "+" in the version tag disappeared:
+// syncthing v1.23.7-dev.26.gdf7b56ae.dirty-stversionextra "Fermium Flea" (go1.20.5 darwin-arm64) jb@ok.kastelo.net 2023-07-12 06:55:26 UTC [Some Wrapper, purego, stnoupgrade]
+var (
+	longVersionRE = regexp.MustCompile(`syncthing\s+(v[^\s]+)\s+"([^"]+)"\s\(([^\s]+)\s+([^-]+)-([^)]+)\)\s+([^\s]+)[^\[]*(?:\[(.+)\])?$`)
+	gitExtraRE    = regexp.MustCompile(`\.\d+\.g[0-9a-f]+`) // ".1.g6aaae618"
+	gitExtraSepRE = regexp.MustCompile(`[.-]`)              // dot or dash
+)
 
 type version struct {
 	version  string   // "v1.1.4-rc.1+30-g6aaae618-dirty-crashrep"
@@ -214,10 +264,21 @@ func parseVersion(line string) (version, error) {
 		builder:  m[6],
 	}
 
-	parts := strings.Split(v.version, "+")
+	// Split the version tag into tag and commit. This is old style
+	// v1.2.3-something.4+11-g12345678 or newer with just dots
+	// v1.2.3-something.4.11.g12345678 or v1.2.3-dev.11.g12345678.
+	parts := []string{v.version}
+	if strings.Contains(v.version, "+") {
+		parts = strings.Split(v.version, "+")
+	} else {
+		idxs := gitExtraRE.FindStringIndex(v.version)
+		if len(idxs) > 0 {
+			parts = []string{v.version[:idxs[0]], v.version[idxs[0]+1:]}
+		}
+	}
 	v.tag = parts[0]
 	if len(parts) > 1 {
-		fields := strings.Split(parts[1], "-")
+		fields := gitExtraSepRE.Split(parts[1], -1)
 		if len(fields) >= 2 && strings.HasPrefix(fields[1], "g") {
 			v.commit = fields[1][1:]
 		}

cmd/stcrashreceiver/sentry_test.go

@@ -44,6 +44,20 @@ func TestParseVersion(t *testing.T) {
 				extra:    []string{"foo", "bar"},
 			},
 		},
+		{
+			longVersion: `syncthing v1.23.7-dev.26.gdf7b56ae-stversionextra "Fermium Flea" (go1.20.5 darwin-arm64) jb@ok.kastelo.net 2023-07-12 06:55:26 UTC [Some Wrapper, purego, stnoupgrade]`,
+			parsed: version{
+				version:  "v1.23.7-dev.26.gdf7b56ae-stversionextra",
+				tag:      "v1.23.7-dev",
+				commit:   "df7b56ae",
+				codename: "Fermium Flea",
+				runtime:  "go1.20.5",
+				goos:     "darwin",
+				goarch:   "arm64",
+				builder:  "jb@ok.kastelo.net",
+				extra:    []string{"Some Wrapper", "purego", "stnoupgrade"},
+			},
+		},
 	}
 
 	for _, tc := range cases {

cmd/stcrashreceiver/stcrashreceiver.go

@@ -7,20 +7,16 @@
 package main
 
 import (
-	"bytes"
-	"compress/gzip"
 	"io"
 	"log"
 	"net/http"
-	"os"
 	"path"
-	"path/filepath"
 	"strings"
 )
 
 type crashReceiver struct {
-	dir string
-	dsn string
+	store  *diskStore
+	sentry *sentryService
 }
 
 func (r *crashReceiver) ServeHTTP(w http.ResponseWriter, req *http.Request) {
@@ -43,54 +39,42 @@ func (r *crashReceiver) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 		return
 	}
 
-	// The location of the report on disk, compressed
-	fullPath := filepath.Join(r.dir, r.dirFor(reportID), reportID) + ".gz"
-
 	switch req.Method {
 	case http.MethodGet:
-		r.serveGet(fullPath, w, req)
+		r.serveGet(reportID, w, req)
 	case http.MethodHead:
-		r.serveHead(fullPath, w, req)
+		r.serveHead(reportID, w, req)
 	case http.MethodPut:
-		r.servePut(reportID, fullPath, w, req)
+		r.servePut(reportID, w, req)
 	default:
 		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
 	}
 }
 
 // serveGet responds to GET requests by serving the uncompressed report.
-func (r *crashReceiver) serveGet(fullPath string, w http.ResponseWriter, _ *http.Request) {
-	fd, err := os.Open(fullPath)
+func (r *crashReceiver) serveGet(reportID string, w http.ResponseWriter, _ *http.Request) {
+	bs, err := r.store.Get(reportID)
 	if err != nil {
 		http.Error(w, "Not found", http.StatusNotFound)
 		return
 	}
-
-	defer fd.Close()
-	gr, err := gzip.NewReader(fd)
-	if err != nil {
-		http.Error(w, "Internal server error", http.StatusInternalServerError)
-		return
-	}
-	_, _ = io.Copy(w, gr) // best effort
+	w.Write(bs)
 }
 
 // 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) {
-	if _, err := os.Lstat(fullPath); err != nil {
+func (r *crashReceiver) serveHead(reportID string, w http.ResponseWriter, _ *http.Request) {
+	if !r.store.Exists(reportID) {
 		http.Error(w, "Not found", http.StatusNotFound)
 	}
 }
 
 // servePut accepts and stores the given report.
-func (r *crashReceiver) servePut(reportID, fullPath string, w http.ResponseWriter, req *http.Request) {
-	// Ensure the destination directory exists
-	if err := os.MkdirAll(filepath.Dir(fullPath), 0755); err != nil {
-		log.Println("Creating directory:", err)
-		http.Error(w, "Internal server error", http.StatusInternalServerError)
-		return
-	}
+func (r *crashReceiver) servePut(reportID string, w http.ResponseWriter, req *http.Request) {
+	result := "receive_failure"
+	defer func() {
+		metricCrashReportsTotal.WithLabelValues(result).Inc()
+	}()
 
 	// Read at most maxRequestSize of report data.
 	log.Println("Receiving report", reportID)
@@ -102,40 +86,17 @@ func (r *crashReceiver) servePut(reportID, fullPath string, w http.ResponseWrite
 		return
 	}
 
-	// Compress the report for storage
-	buf := new(bytes.Buffer)
-	gw := gzip.NewWriter(buf)
-	_, _ = gw.Write(bs) // can't fail
-	gw.Close()
+	result = "success"
 
-	// Create an output file with the compressed report
-	err = os.WriteFile(fullPath, buf.Bytes(), 0644)
-	if err != nil {
-		log.Println("Saving report:", err)
-		http.Error(w, "Internal server error", http.StatusInternalServerError)
-		return
+	// Store the report
+	if !r.store.Put(reportID, bs) {
+		log.Println("Failed to store report (queue full):", reportID)
+		result = "queue_failure"
 	}
 
 	// Send the report to Sentry
-	if r.dsn != "" {
-		// Remote ID
-		user := userIDFor(req)
-
-		go func() {
-			// There's no need for the client to have to wait for this part.
-			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)
-			}
-		}()
+	if !r.sentry.Send(reportID, userIDFor(req), bs) {
+		log.Println("Failed to send report to sentry (queue full):", reportID)
+		result = "sentry_failure"
 	}
 }
-
-// 01234567890abcdef... => 01/23
-func (r *crashReceiver) dirFor(base string) string {
-	return filepath.Join(base[0:2], base[2:4])
-}

cmd/stdiscosrv/apisrv.go

@@ -8,11 +8,15 @@ package main
 
 import (
 	"bytes"
+	"compress/gzip"
 	"context"
 	"crypto/tls"
+	"encoding/base64"
 	"encoding/json"
 	"encoding/pem"
+	"errors"
 	"fmt"
+	io "io"
 	"log"
 	"math/rand"
 	"net"
@@ -25,6 +29,7 @@ import (
 	"time"
 
 	"github.com/syncthing/syncthing/lib/protocol"
+	"github.com/syncthing/syncthing/lib/stringutil"
 )
 
 // announcement is the format received from and sent to clients
@@ -66,7 +71,7 @@ func newAPISrv(addr string, cert tls.Certificate, db database, repl replicator,
 	}
 }
 
-func (s *apiSrv) Serve(ctx context.Context) error {
+func (s *apiSrv) Serve(_ context.Context) error {
 	if s.useHTTP {
 		listener, err := net.Listen("tcp", s.addr)
 		if err != nil {
@@ -76,18 +81,10 @@ func (s *apiSrv) Serve(ctx context.Context) error {
 		s.listener = listener
 	} else {
 		tlsCfg := &tls.Config{
-			Certificates:           []tls.Certificate{s.cert},
-			ClientAuth:             tls.RequestClientCert,
-			SessionTicketsDisabled: true,
-			MinVersion:             tls.VersionTLS12,
-			CipherSuites: []uint16{
-				tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
-				tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
-				tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
-				tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
-				tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
-				tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
-			},
+			Certificates: []tls.Certificate{s.cert},
+			ClientAuth:   tls.RequestClientCert,
+			MinVersion:   tls.VersionTLS12,
+			NextProtos:   []string{"h2", "http/1.1"},
 		}
 
 		tlsListener, err := tls.Listen("tcp", s.addr, tlsCfg)
@@ -105,6 +102,7 @@ func (s *apiSrv) Serve(ctx context.Context) error {
 		ReadTimeout:    httpReadTimeout,
 		WriteTimeout:   httpWriteTimeout,
 		MaxHeaderBytes: httpMaxHeaderBytes,
+		ErrorLog:       log.New(io.Discard, "", 0),
 	}
 
 	err := srv.Serve(s.listener)
@@ -114,8 +112,6 @@ func (s *apiSrv) Serve(ctx context.Context) error {
 	return err
 }
 
-var topCtx = context.Background()
-
 func (s *apiSrv) handler(w http.ResponseWriter, req *http.Request) {
 	t0 := time.Now()
 
@@ -128,10 +124,10 @@ func (s *apiSrv) handler(w http.ResponseWriter, req *http.Request) {
 	}()
 
 	reqID := requestID(rand.Int63())
-	ctx := context.WithValue(topCtx, idKey, reqID)
+	req = req.WithContext(context.WithValue(req.Context(), idKey, reqID))
 
 	if debug {
-		log.Println(reqID, req.Method, req.URL)
+		log.Println(reqID, req.Method, req.URL, req.Proto)
 	}
 
 	remoteAddr := &net.TCPAddr{
@@ -140,7 +136,12 @@ func (s *apiSrv) handler(w http.ResponseWriter, req *http.Request) {
 	}
 
 	if s.useHTTP {
-		remoteAddr.IP = net.ParseIP(req.Header.Get("X-Forwarded-For"))
+		// X-Forwarded-For can have multiple client IPs; split using the comma separator
+		forwardIP, _, _ := strings.Cut(req.Header.Get("X-Forwarded-For"), ",")
+
+		// net.ParseIP will return nil if leading/trailing whitespace exists; use strings.TrimSpace()
+		remoteAddr.IP = net.ParseIP(strings.TrimSpace(forwardIP))
+
 		if parsedPort, err := strconv.ParseInt(req.Header.Get("X-Client-Port"), 10, 0); err == nil {
 			remoteAddr.Port = int(parsedPort)
 		}
@@ -157,17 +158,17 @@ func (s *apiSrv) handler(w http.ResponseWriter, req *http.Request) {
 	}
 
 	switch req.Method {
-	case "GET":
-		s.handleGET(ctx, lw, req)
-	case "POST":
-		s.handlePOST(ctx, remoteAddr, lw, req)
+	case http.MethodGet:
+		s.handleGET(lw, req)
+	case http.MethodPost:
+		s.handlePOST(remoteAddr, lw, req)
 	default:
 		http.Error(lw, "Method Not Allowed", http.StatusMethodNotAllowed)
 	}
 }
 
-func (s *apiSrv) handleGET(ctx context.Context, w http.ResponseWriter, req *http.Request) {
-	reqID := ctx.Value(idKey).(requestID)
+func (s *apiSrv) handleGET(w http.ResponseWriter, req *http.Request) {
+	reqID := req.Context().Value(idKey).(requestID)
 
 	deviceID, err := protocol.DeviceIDFromString(req.URL.Query().Get("device"))
 	if err != nil {
@@ -211,28 +212,39 @@ func (s *apiSrv) handleGET(ctx context.Context, w http.ResponseWriter, req *http
 			s.db.put(key, rec)
 		}
 
-		w.Header().Set("Retry-After", notFoundRetryAfterString(int(misses)))
+		afterS := notFoundRetryAfterSeconds(int(misses))
+		retryAfterHistogram.Observe(float64(afterS))
+		w.Header().Set("Retry-After", strconv.Itoa(afterS))
 		http.Error(w, "Not Found", http.StatusNotFound)
 		return
 	}
 
 	lookupRequestsTotal.WithLabelValues("success").Inc()
 
-	bs, _ := json.Marshal(announcement{
-		Seen:      time.Unix(0, rec.Seen),
+	w.Header().Set("Content-Type", "application/json")
+	var bw io.Writer = w
+
+	// Use compression if the client asks for it
+	if strings.Contains(req.Header.Get("Accept-Encoding"), "gzip") {
+		w.Header().Set("Content-Encoding", "gzip")
+		gw := gzip.NewWriter(bw)
+		defer gw.Close()
+		bw = gw
+	}
+
+	json.NewEncoder(bw).Encode(announcement{
+		Seen:      time.Unix(0, rec.Seen).Truncate(time.Second),
 		Addresses: addressStrs(rec.Addresses),
 	})
-	w.Header().Set("Content-Type", "application/json")
-	w.Write(bs)
 }
 
-func (s *apiSrv) handlePOST(ctx context.Context, remoteAddr *net.TCPAddr, w http.ResponseWriter, req *http.Request) {
-	reqID := ctx.Value(idKey).(requestID)
+func (s *apiSrv) handlePOST(remoteAddr *net.TCPAddr, w http.ResponseWriter, req *http.Request) {
+	reqID := req.Context().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())
@@ -300,13 +312,13 @@ 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
@@ -319,7 +331,7 @@ func certificateBytes(req *http.Request) []byte {
 			hdr, err := url.QueryUnescape(hdr)
 			if err != nil {
 				// Decoding failed
-				return nil
+				return nil, err
 			}
 
 			bs = []byte(hdr)
@@ -338,15 +350,27 @@ func certificateBytes(req *http.Request) []byte {
 				}
 			}
 		}
-	} 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
-		// and start/end statements. We need to decode, reinstate the newlines every 64
-		// character and add statements for the PEM decoder
-		hdr, err := url.QueryUnescape(hdr)
+	} 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
+			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, maybe with URL encoding
+		// (depends on Traefik version) but without newlines and start/end
+		// statements. We need to decode, reinstate the newlines every 64
+		// character and add statements for the PEM decoder
+
+		if strings.Contains(hdr, "%") {
+			if unesc, err := url.QueryUnescape(hdr); err == nil {
+				hdr = unesc
+			}
 		}
 
 		for i := 64; i < len(hdr); i += 65 {
@@ -354,21 +378,21 @@ func certificateBytes(req *http.Request) []byte {
 		}
 
 		hdr = "-----BEGIN CERTIFICATE-----\n" + hdr
-		hdr = hdr + "\n-----END CERTIFICATE-----\n"
+		hdr += "\n-----END CERTIFICATE-----\n"
 		bs = []byte(hdr)
 	}
 
 	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
@@ -393,13 +417,13 @@ func fixupAddresses(remote *net.TCPAddr, addresses []string) []string {
 			continue
 		}
 
-		if remote != nil {
-			if host == "" || ip.IsUnspecified() {
+		if host == "" || ip.IsUnspecified() {
+			if remote != nil {
 				// Replace the unspecified IP with the request source.
 
 				// ... unless the request source is the loopback address or
 				// multicast/unspecified (can't happen, really).
-				if remote.IP.IsLoopback() || remote.IP.IsMulticast() || remote.IP.IsUnspecified() {
+				if remote.IP == nil || remote.IP.IsLoopback() || remote.IP.IsMulticast() || remote.IP.IsUnspecified() {
 					continue
 				}
 
@@ -415,11 +439,22 @@ func fixupAddresses(remote *net.TCPAddr, addresses []string) []string {
 				}
 
 				host = remote.IP.String()
+
+			} else {
+				// remote is nil, unable to determine host IP
+				continue
 			}
 
-			// If zero port was specified, use remote port.
-			if port == "0" && remote.Port > 0 {
+		}
+
+		// If zero port was specified, use remote port.
+		if port == "0" {
+			if remote != nil && remote.Port > 0 {
+				// use remote port
 				port = strconv.Itoa(remote.Port)
+			} else {
+				// unable to determine remote port
+				continue
 			}
 		}
 
@@ -427,6 +462,9 @@ func fixupAddresses(remote *net.TCPAddr, addresses []string) []string {
 		fixed = append(fixed, uri.String())
 	}
 
+	// Remove duplicate addresses
+	fixed = stringutil.UniqueTrimmedStrings(fixed)
+
 	return fixed
 }
 
@@ -456,13 +494,13 @@ func errorRetryAfterString() string {
 	return strconv.Itoa(errorRetryAfterSeconds + rand.Intn(errorRetryFuzzSeconds))
 }
 
-func notFoundRetryAfterString(misses int) string {
+func notFoundRetryAfterSeconds(misses int) int {
 	retryAfterS := notFoundRetryMinSeconds + notFoundRetryIncSeconds*misses
 	if retryAfterS > notFoundRetryMaxSeconds {
 		retryAfterS = notFoundRetryMaxSeconds
 	}
 	retryAfterS += rand.Intn(notFoundRetryFuzzSeconds)
-	return strconv.Itoa(retryAfterS)
+	return retryAfterS
 }
 
 func reannounceAfterString() string {

cmd/stdiscosrv/apisrv_test.go

@@ -69,6 +69,14 @@ func TestFixupAddresses(t *testing.T) {
 			remote: addr("123.123.123.123", 9000),
 			in:     []string{"tcp://44.44.44.44:0"},
 			out:    []string{"tcp://44.44.44.44:9000"},
+		}, { // remote ip nil
+			remote: addr("", 9000),
+			in:     []string{"tcp://:22000", "tcp://44.44.44.44:9000"},
+			out:    []string{"tcp://44.44.44.44:9000"},
+		}, { // remote port 0
+			remote: addr("123.123.123.123", 0),
+			in:     []string{"tcp://:22000", "tcp://44.44.44.44"},
+			out:    []string{"tcp://123.123.123.123:22000"},
 		},
 	}
 

cmd/stdiscosrv/database.go

@@ -12,10 +12,14 @@ package main
 import (
 	"context"
 	"log"
+	"net"
+	"net/url"
 	"sort"
 	"time"
 
+	"github.com/syncthing/syncthing/lib/sliceutil"
 	"github.com/syndtr/goleveldb/leveldb"
+	"github.com/syndtr/goleveldb/leveldb/storage"
 	"github.com/syndtr/goleveldb/leveldb/util"
 )
 
@@ -54,6 +58,18 @@ func newLevelDBStore(dir string) (*levelDBStore, error) {
 	}, nil
 }
 
+func newMemoryLevelDBStore() (*levelDBStore, error) {
+	db, err := leveldb.Open(storage.NewMemStorage(), nil)
+	if err != nil {
+		return nil, err
+	}
+	return &levelDBStore{
+		db:    db,
+		inbox: make(chan func(), 16),
+		clock: defaultClock{},
+	}, nil
+}
+
 func (s *levelDBStore) put(key string, rec DatabaseRecord) error {
 	t0 := time.Now()
 	defer func() {
@@ -204,7 +220,7 @@ func (s *levelDBStore) statisticsServe(trigger <-chan struct{}, done chan<- stru
 		cutoff24h := t0.Add(-24 * time.Hour).UnixNano()
 		cutoff1w := t0.Add(-7 * 24 * time.Hour).UnixNano()
 		cutoff2Mon := t0.Add(-60 * 24 * time.Hour).UnixNano()
-		current, last24h, last1w, inactive, errors := 0, 0, 0, 0, 0
+		current, currentIPv4, currentIPv6, last24h, last1w, inactive, errors := 0, 0, 0, 0, 0, 0, 0
 
 		iter := s.db.NewIterator(&util.Range{}, nil)
 		for iter.Next() {
@@ -219,9 +235,35 @@ func (s *levelDBStore) statisticsServe(trigger <-chan struct{}, done chan<- stru
 			// If there are addresses that have not expired it's a current
 			// record, otherwise account it based on when it was last seen
 			// (last 24 hours or last week) or finally as inactice.
+			addrs := expire(rec.Addresses, nowNanos)
 			switch {
-			case len(expire(rec.Addresses, nowNanos)) > 0:
+			case len(addrs) > 0:
 				current++
+				seenIPv4, seenIPv6 := false, false
+				for _, addr := range addrs {
+					uri, err := url.Parse(addr.Address)
+					if err != nil {
+						continue
+					}
+					host, _, err := net.SplitHostPort(uri.Host)
+					if err != nil {
+						continue
+					}
+					if ip := net.ParseIP(host); ip != nil && ip.To4() != nil {
+						seenIPv4 = true
+					} else if ip != nil {
+						seenIPv6 = true
+					}
+					if seenIPv4 && seenIPv6 {
+						break
+					}
+				}
+				if seenIPv4 {
+					currentIPv4++
+				}
+				if seenIPv6 {
+					currentIPv6++
+				}
 			case rec.Seen > cutoff24h:
 				last24h++
 			case rec.Seen > cutoff1w:
@@ -245,6 +287,8 @@ func (s *levelDBStore) statisticsServe(trigger <-chan struct{}, done chan<- stru
 		iter.Release()
 
 		databaseKeys.WithLabelValues("current").Set(float64(current))
+		databaseKeys.WithLabelValues("currentIPv4").Set(float64(currentIPv4))
+		databaseKeys.WithLabelValues("currentIPv6").Set(float64(currentIPv6))
 		databaseKeys.WithLabelValues("last24h").Set(float64(last24h))
 		databaseKeys.WithLabelValues("last1w").Set(float64(last1w))
 		databaseKeys.WithLabelValues("inactive").Set(float64(inactive))
@@ -339,14 +383,7 @@ func expire(addrs []DatabaseAddress, now int64) []DatabaseAddress {
 	i := 0
 	for i < len(addrs) {
 		if addrs[i].Expires < now {
-			// This item is expired. Replace it with the last in the list
-			// (noop if we are at the last item).
-			addrs[i] = addrs[len(addrs)-1]
-			// Wipe the last item of the list to release references to
-			// strings and stuff.
-			addrs[len(addrs)-1] = DatabaseAddress{}
-			// Shorten the slice.
-			addrs = addrs[:len(addrs)-1]
+			addrs = sliceutil.RemoveAndZero(addrs, i)
 			continue
 		}
 		i++

cmd/stdiscosrv/database_test.go

@@ -9,15 +9,12 @@ package main
 import (
 	"context"
 	"fmt"
-	"os"
 	"testing"
 	"time"
 )
 
 func TestDatabaseGetSet(t *testing.T) {
-	os.RemoveAll("_database")
-	defer os.RemoveAll("_database")
-	db, err := newLevelDBStore("_database")
+	db, err := newMemoryLevelDBStore()
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -119,7 +116,7 @@ func TestDatabaseGetSet(t *testing.T) {
 
 	// Put a record with misses
 
-	rec = DatabaseRecord{Misses: 42}
+	rec = DatabaseRecord{Misses: 42, Missed: tc.Now().UnixNano()}
 	if err := db.put("efgh", rec); err != nil {
 		t.Fatal(err)
 	}
@@ -188,7 +185,7 @@ func TestFilter(t *testing.T) {
 		},
 		{
 			a: []DatabaseAddress{{Address: "a", Expires: 5}, {Address: "b", Expires: 15}, {Address: "c", Expires: 5}, {Address: "d", Expires: 15}, {Address: "e", Expires: 5}},
-			b: []DatabaseAddress{{Address: "d", Expires: 15}, {Address: "b", Expires: 15}}, // gets reordered
+			b: []DatabaseAddress{{Address: "b", Expires: 15}, {Address: "d", Expires: 15}},
 		},
 	}
 
@@ -209,5 +206,6 @@ func (t *testClock) wind(d time.Duration) {
 }
 
 func (t *testClock) Now() time.Time {
+	t.now = t.now.Add(time.Nanosecond)
 	return t.now
 }

cmd/stdiscosrv/main.go

@@ -14,6 +14,7 @@ import (
 	"net"
 	"net/http"
 	"os"
+	"runtime"
 	"strings"
 	"time"
 
@@ -64,9 +65,7 @@ var levelDBOptions = &opt.Options{
 	WriteBuffer: 32 << 20, // default 4<<20
 }
 
-var (
-	debug = false
-)
+var debug = false
 
 func main() {
 	var listen string
@@ -76,20 +75,26 @@ func main() {
 	var replicationPeers string
 	var certFile string
 	var keyFile string
+	var replCertFile string
+	var replKeyFile string
 	var useHTTP bool
+	var largeDB bool
 
 	log.SetOutput(os.Stdout)
 	log.SetFlags(0)
 
 	flag.StringVar(&certFile, "cert", "./cert.pem", "Certificate file")
+	flag.StringVar(&keyFile, "key", "./key.pem", "Key file")
 	flag.StringVar(&dir, "db-dir", "./discovery.db", "Database directory")
 	flag.BoolVar(&debug, "debug", false, "Print debug output")
 	flag.BoolVar(&useHTTP, "http", false, "Listen on HTTP (behind an HTTPS proxy)")
 	flag.StringVar(&listen, "listen", ":8443", "Listen address")
-	flag.StringVar(&keyFile, "key", "./key.pem", "Key file")
 	flag.StringVar(&metricsListen, "metrics-listen", "", "Metrics listen address")
 	flag.StringVar(&replicationPeers, "replicate", "", "Replication peers, id@address, comma separated")
 	flag.StringVar(&replicationListen, "replication-listen", ":19200", "Replication listen address")
+	flag.StringVar(&replCertFile, "replication-cert", "", "Certificate file for replication")
+	flag.StringVar(&replKeyFile, "replication-key", "", "Key file for replication")
+	flag.BoolVar(&largeDB, "large-db", false, "Use larger database settings")
 	showVersion := flag.Bool("version", false, "Show version")
 	flag.Parse()
 
@@ -98,6 +103,17 @@ func main() {
 		return
 	}
 
+	buildInfo.WithLabelValues(build.Version, runtime.Version(), build.User, build.Date.UTC().Format("2006-01-02T15:04:05Z")).Set(1)
+
+	if largeDB {
+		levelDBOptions.BlockCacheCapacity = 64 << 20
+		levelDBOptions.BlockSize = 64 << 10
+		levelDBOptions.CompactionTableSize = 16 << 20
+		levelDBOptions.CompactionTableSizeMultiplier = 2.0
+		levelDBOptions.WriteBuffer = 64 << 20
+		levelDBOptions.CompactionL0Trigger = 8
+	}
+
 	cert, err := tls.LoadX509KeyPair(certFile, keyFile)
 	if os.IsNotExist(err) {
 		log.Println("Failed to load keypair. Generating one, this might take a while...")
@@ -111,13 +127,26 @@ func main() {
 	devID := protocol.NewDeviceID(cert.Certificate[0])
 	log.Println("Server device ID is", devID)
 
+	replCert := cert
+	if replCertFile != "" && replKeyFile != "" {
+		replCert, err = tls.LoadX509KeyPair(replCertFile, replKeyFile)
+		if err != nil {
+			log.Fatalln("Failed to load replication keypair:", err)
+		}
+	}
+	replDevID := protocol.NewDeviceID(replCert.Certificate[0])
+	log.Println("Replication device ID is", replDevID)
+
 	// Parse the replication specs, if any.
 	var allowedReplicationPeers []protocol.DeviceID
 	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
@@ -137,6 +166,9 @@ 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:
@@ -159,14 +191,14 @@ func main() {
 	// Start any replication senders.
 	var repl replicationMultiplexer
 	for _, dst := range replicationDestinations {
-		rs := newReplicationSender(dst, cert, allowedReplicationPeers)
+		rs := newReplicationSender(dst, replCert, allowedReplicationPeers)
 		main.Add(rs)
 		repl = append(repl, rs)
 	}
 
 	// If we have replication configured, start the replication listener.
 	if len(allowedReplicationPeers) > 0 {
-		rl := newReplicationListener(replicationListen, cert, allowedReplicationPeers, db)
+		rl := newReplicationListener(replicationListen, replCert, allowedReplicationPeers, db)
 		main.Add(rl)
 	}
 

cmd/stdiscosrv/replication.go

@@ -19,8 +19,11 @@ import (
 	"github.com/syncthing/syncthing/lib/protocol"
 )
 
-const replicationReadTimeout = time.Minute
-const replicationHeartbeatInterval = time.Second * 30
+const (
+	replicationReadTimeout       = time.Minute
+	replicationWriteTimeout      = 30 * time.Second
+	replicationHeartbeatInterval = time.Second * 30
+)
 
 type replicator interface {
 	send(key string, addrs []DatabaseAddress, seen int64)
@@ -68,6 +71,12 @@ func (s *replicationSender) Serve(ctx context.Context) error {
 		conn.Close()
 	}()
 
+	// The replication stream is not especially latency sensitive, but it is
+	// quite a lot of data in small writes. Make it more efficient.
+	if tcpc, ok := conn.NetConn().(*net.TCPConn); ok {
+		_ = tcpc.SetNoDelay(false)
+	}
+
 	// Get the other side device ID.
 	remoteID, err := deviceID(conn)
 	if err != nil {
@@ -116,11 +125,11 @@ func (s *replicationSender) Serve(ctx context.Context) error {
 			binary.BigEndian.PutUint32(buf, uint32(n))
 
 			// Send
-			conn.SetWriteDeadline(time.Now().Add(5 * time.Second))
+			conn.SetWriteDeadline(time.Now().Add(replicationWriteTimeout))
 			if _, err := conn.Write(buf[:4+n]); err != nil {
 				replicationSendsTotal.WithLabelValues("error").Inc()
 				log.Println("Replication write:", err)
-				// Yes, we are loosing the replication event here.
+				// Yes, we are losing the replication event here.
 				return err
 			}
 			replicationSendsTotal.WithLabelValues("success").Inc()
@@ -135,7 +144,7 @@ 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,

cmd/stdiscosrv/stats.go

@@ -10,9 +10,18 @@ import (
 	"os"
 
 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/collectors"
 )
 
 var (
+	buildInfo = prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Namespace: "syncthing",
+			Subsystem: "discovery",
+			Name:      "build_info",
+			Help:      "A metric with a constant '1' value labeled by version, goversion, builduser and builddate from which stdiscosrv was built.",
+		}, []string{"version", "goversion", "builduser", "builddate"})
+
 	apiRequestsTotal = prometheus.NewCounterVec(
 		prometheus.CounterOpts{
 			Namespace: "syncthing",
@@ -89,6 +98,14 @@ var (
 			Help:       "Latency of database operations.",
 			Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
 		}, []string{"operation"})
+
+	retryAfterHistogram = prometheus.NewHistogram(prometheus.HistogramOpts{
+		Namespace: "syncthing",
+		Subsystem: "discovery",
+		Name:      "retry_after_seconds",
+		Help:      "Retry-After header value in seconds.",
+		Buckets:   prometheus.ExponentialBuckets(60, 2, 7), // 60, 120, 240, 480, 960, 1920, 3840
+	})
 )
 
 const (
@@ -103,13 +120,15 @@ const (
 )
 
 func init() {
-	prometheus.MustRegister(apiRequestsTotal, apiRequestsSeconds,
+	prometheus.MustRegister(buildInfo,
+		apiRequestsTotal, apiRequestsSeconds,
 		lookupRequestsTotal, announceRequestsTotal,
 		replicationSendsTotal, replicationRecvsTotal,
 		databaseKeys, databaseStatisticsSeconds,
-		databaseOperations, databaseOperationSeconds)
+		databaseOperations, databaseOperationSeconds,
+		retryAfterHistogram)
 
-	processCollectorOpts := prometheus.ProcessCollectorOpts{
+	processCollectorOpts := collectors.ProcessCollectorOpts{
 		Namespace: "syncthing_discovery",
 		PidFn: func() (int, error) {
 			return os.Getpid(), nil
@@ -117,7 +136,6 @@ func init() {
 	}
 
 	prometheus.MustRegister(
-		prometheus.NewProcessCollector(processCollectorOpts),
+		collectors.NewProcessCollector(processCollectorOpts),
 	)
-
 }

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}
 	}

cmd/stgenfiles/main.go

@@ -66,7 +66,7 @@ func generateFiles(dir string, files, maxexp int, srcname string) error {
 }
 
 func generateOneFile(fd io.ReadSeeker, p1 string, s int64) error {
-	src := io.LimitReader(&inifiteReader{fd}, s)
+	src := io.LimitReader(&infiniteReader{fd}, s)
 	dst, err := os.Create(p1)
 	if err != nil {
 		return err
@@ -105,11 +105,11 @@ func readRand(bs []byte) (int, error) {
 	return len(bs), nil
 }
 
-type inifiteReader struct {
+type infiniteReader struct {
 	rd io.ReadSeeker
 }
 
-func (i *inifiteReader) Read(bs []byte) (int, error) {
+func (i *infiniteReader) Read(bs []byte) (int, error) {
 	n, err := i.rd.Read(bs)
 	if err == io.EOF {
 		err = nil

cmd/strelaypoolsrv/gui/index.html

@@ -237,7 +237,7 @@
       uptimeSeconds: 0,
     };
     $scope.map = L.map('map').setView([40.90296, 1.90925], 2);
-    L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
+    L.tileLayer('https://tile.openstreetmap.org/{z}/{x}/{y}.png',
     {
       attribution: 'Leaflet',
       maxZoom: 17

cmd/strelaypoolsrv/main.go

@@ -3,14 +3,12 @@
 package main
 
 import (
-	"compress/gzip"
 	"context"
 	"crypto/tls"
 	"crypto/x509"
 	"encoding/json"
 	"flag"
 	"fmt"
-	"io"
 	"log"
 	"net"
 	"net/http"
@@ -19,11 +17,13 @@ import (
 	"path/filepath"
 	"strconv"
 	"strings"
+	"sync/atomic"
 	"time"
 
+	lru "github.com/hashicorp/golang-lru/v2"
+	"github.com/syncthing/syncthing/lib/httpcache"
 	"github.com/syncthing/syncthing/lib/protocol"
 
-	"github.com/golang/groupcache/lru"
 	"github.com/oschwald/geoip2-golang"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
@@ -33,7 +33,6 @@ import (
 	"github.com/syncthing/syncthing/lib/relay/client"
 	"github.com/syncthing/syncthing/lib/sync"
 	"github.com/syncthing/syncthing/lib/tlsutil"
-	"golang.org/x/time/rate"
 )
 
 type location struct {
@@ -99,27 +98,13 @@ var (
 	dir               string
 	evictionTime      = time.Hour
 	debug             bool
-	getLRUSize        = 10 << 10
-	getLimitBurst     = 10
-	getLimitAvg       = 2
-	postLRUSize       = 1 << 10
-	postLimitBurst    = 2
-	postLimitAvg      = 2
-	getLimit          time.Duration
-	postLimit         time.Duration
 	permRelaysFile    string
 	ipHeader          string
 	geoipPath         string
 	proto             string
-	statsRefresh      = time.Minute / 2
-	requestQueueLen   = 10
-	requestProcessors = 1
-
-	getMut      = sync.NewMutex()
-	getLRUCache *lru.Cache
-
-	postMut      = sync.NewMutex()
-	postLRUCache *lru.Cache
+	statsRefresh      = time.Minute
+	requestQueueLen   = 64
+	requestProcessors = 8
 
 	requests chan request
 
@@ -127,6 +112,7 @@ var (
 	knownRelays     = make([]*relay, 0)
 	permanentRelays = make([]*relay, 0)
 	evictionTimers  = make(map[string]*time.Timer)
+	globalBlocklist = newErrorTracker(1000)
 )
 
 const (
@@ -141,13 +127,8 @@ func main() {
 	flag.StringVar(&dir, "keys", dir, "Directory where http-cert.pem and http-key.pem is stored for TLS listening")
 	flag.BoolVar(&debug, "debug", debug, "Enable debug output")
 	flag.DurationVar(&evictionTime, "eviction", evictionTime, "After how long the relay is evicted")
-	flag.IntVar(&getLRUSize, "get-limit-cache", getLRUSize, "Get request limiter cache size")
-	flag.IntVar(&getLimitAvg, "get-limit-avg", getLimitAvg, "Allowed average get request rate, per 10 s")
-	flag.IntVar(&getLimitBurst, "get-limit-burst", getLimitBurst, "Allowed burst get requests")
-	flag.IntVar(&postLRUSize, "post-limit-cache", postLRUSize, "Post request limiter cache size")
-	flag.IntVar(&postLimitAvg, "post-limit-avg", postLimitAvg, "Allowed average post request rate, per minute")
-	flag.IntVar(&postLimitBurst, "post-limit-burst", postLimitBurst, "Allowed burst post requests")
 	flag.StringVar(&permRelaysFile, "perm-relays", "", "Path to list of permanent relays")
+	flag.StringVar(&knownRelaysFile, "known-relays", knownRelaysFile, "Path to list of current relays")
 	flag.StringVar(&ipHeader, "ip-header", "", "Name of header which holds clients ip:port. Only meaningful when running behind a reverse proxy.")
 	flag.StringVar(&geoipPath, "geoip", "GeoLite2-City.mmdb", "Path to GeoLite2-City database")
 	flag.StringVar(&proto, "protocol", "tcp", "Protocol used for listening. 'tcp' for IPv4 and IPv6, 'tcp4' for IPv4, 'tcp6' for IPv6")
@@ -159,12 +140,6 @@ func main() {
 
 	requests = make(chan request, requestQueueLen)
 
-	getLimit = 10 * time.Second / time.Duration(getLimitAvg)
-	postLimit = time.Minute / time.Duration(postLimitAvg)
-
-	getLRUCache = lru.New(getLRUSize)
-	postLRUCache = lru.New(postLRUSize)
-
 	var listener net.Listener
 	var err error
 
@@ -240,7 +215,7 @@ func main() {
 
 	handler := http.NewServeMux()
 	handler.HandleFunc("/", handleAssets)
-	handler.HandleFunc("/endpoint", handleRequest)
+	handler.Handle("/endpoint", httpcache.SinglePath(http.HandlerFunc(handleRequest), 15*time.Second))
 	handler.HandleFunc("/metrics", handleMetrics)
 
 	srv := http.Server{
@@ -291,21 +266,17 @@ func handleRequest(w http.ResponseWriter, r *http.Request) {
 	}()
 
 	if ipHeader != "" {
-		r.RemoteAddr = r.Header.Get(ipHeader)
+		hdr := r.Header.Get(ipHeader)
+		fields := strings.Split(hdr, ",")
+		if len(fields) > 0 {
+			r.RemoteAddr = strings.TrimSpace(fields[len(fields)-1])
+		}
 	}
 	w.Header().Set("Access-Control-Allow-Origin", "*")
 	switch r.Method {
 	case "GET":
-		if limit(r.RemoteAddr, getLRUCache, getMut, getLimit, getLimitBurst) {
-			w.WriteHeader(httpStatusEnhanceYourCalm)
-			return
-		}
 		handleGetRequest(w, r)
 	case "POST":
-		if limit(r.RemoteAddr, postLRUCache, postMut, postLimit, postLimitBurst) {
-			w.WriteHeader(httpStatusEnhanceYourCalm)
-			return
-		}
 		handlePostRequest(w, r)
 	default:
 		if debug {
@@ -327,20 +298,28 @@ func handleGetRequest(rw http.ResponseWriter, r *http.Request) {
 	// Shuffle
 	rand.Shuffle(relays)
 
-	w := io.Writer(rw)
-	if strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
-		rw.Header().Set("Content-Encoding", "gzip")
-		gw := gzip.NewWriter(rw)
-		defer gw.Close()
-		w = gw
-	}
-
-	_ = json.NewEncoder(w).Encode(map[string][]*relay{
+	_ = json.NewEncoder(rw).Encode(map[string][]*relay{
 		"relays": relays,
 	})
 }
 
 func handlePostRequest(w http.ResponseWriter, r *http.Request) {
+	// Get the IP address of the client
+	rhost := r.RemoteAddr
+	if host, _, err := net.SplitHostPort(rhost); err == nil {
+		rhost = host
+	}
+
+	// Check the black list. A client is blacklisted if their last 10
+	// attempts to join have all failed. The "Unauthorized" status return
+	// causes strelaysrv to cease attempting to join.
+	if globalBlocklist.IsBlocked(rhost) {
+		log.Println("Rejected blocked client", rhost)
+		http.Error(w, "Too many errors", http.StatusUnauthorized)
+		globalBlocklist.ClearErrors(rhost)
+		return
+	}
+
 	var relayCert *x509.Certificate
 	if r.TLS != nil && len(r.TLS.PeerCertificates) > 0 {
 		relayCert = r.TLS.PeerCertificates[0]
@@ -368,6 +347,11 @@ 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()
@@ -387,12 +371,6 @@ func handlePostRequest(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	// Get the IP address of the client
-	rhost := r.RemoteAddr
-	if host, _, err := net.SplitHostPort(rhost); err == nil {
-		rhost = host
-	}
-
 	ip := net.ParseIP(host)
 	// The client did not provide an IP address, use the IP address of the client.
 	if ip == nil || ip.IsUnspecified() {
@@ -424,10 +402,14 @@ func handlePostRequest(w http.ResponseWriter, r *http.Request) {
 	case requests <- request{&newRelay, reschan, prometheus.NewTimer(relayTestActionsSeconds.WithLabelValues("queue"))}:
 		result := <-reschan
 		if result.err != nil {
+			log.Println("Join from", r.RemoteAddr, "failed:", result.err)
+			globalBlocklist.AddError(rhost)
 			relayTestsTotal.WithLabelValues("failed").Inc()
 			http.Error(w, result.err.Error(), http.StatusBadRequest)
 			return
 		}
+		log.Println("Join from", r.RemoteAddr, "succeeded")
+		globalBlocklist.ClearErrors(rhost)
 		relayTestsTotal.WithLabelValues("success").Inc()
 		w.Header().Set("Content-Type", "application/json; charset=utf-8")
 		json.NewEncoder(w).Encode(map[string]time.Duration{
@@ -541,23 +523,6 @@ func evict(relay *relay) func() {
 	}
 }
 
-func limit(addr string, cache *lru.Cache, lock sync.Mutex, intv time.Duration, burst int) bool {
-	if host, _, err := net.SplitHostPort(addr); err == nil {
-		addr = host
-	}
-
-	lock.Lock()
-	v, _ := cache.Get(addr)
-	bkt, ok := v.(*rate.Limiter)
-	if !ok {
-		bkt = rate.NewLimiter(rate.Every(intv), burst)
-		cache.Add(addr, bkt)
-	}
-	lock.Unlock()
-
-	return !bkt.Allow()
-}
-
 func loadRelays(file string) []*relay {
 	content, err := os.ReadFile(file)
 	if err != nil {
@@ -567,7 +532,7 @@ func loadRelays(file string) []*relay {
 
 	var relays []*relay
 	for _, line := range strings.Split(string(content), "\n") {
-		if len(line) == 0 {
+		if line == "" {
 			continue
 		}
 
@@ -597,7 +562,7 @@ func saveRelays(file string, relays []*relay) error {
 	for _, relay := range relays {
 		content += relay.uri.String() + "\n"
 	}
-	return os.WriteFile(file, []byte(content), 0777)
+	return os.WriteFile(file, []byte(content), 0o777)
 }
 
 func createTestCertificate() tls.Certificate {
@@ -656,3 +621,42 @@ func (lrw *loggingResponseWriter) WriteHeader(code int) {
 	lrw.statusCode = code
 	lrw.ResponseWriter.WriteHeader(code)
 }
+
+type errorTracker struct {
+	errors *lru.TwoQueueCache[string, *errorCounter]
+}
+
+type errorCounter struct {
+	count atomic.Int32
+}
+
+func newErrorTracker(size int) *errorTracker {
+	cache, err := lru.New2Q[string, *errorCounter](size)
+	if err != nil {
+		panic(err)
+	}
+	return &errorTracker{
+		errors: cache,
+	}
+}
+
+func (b *errorTracker) AddError(host string) {
+	entry, ok := b.errors.Get(host)
+	if !ok {
+		entry = &errorCounter{}
+		b.errors.Add(host, entry)
+	}
+	c := entry.count.Add(1)
+	log.Printf("Error count for %s is now %d", host, c)
+}
+
+func (b *errorTracker) ClearErrors(host string) {
+	b.errors.Remove(host)
+}
+
+func (b *errorTracker) IsBlocked(host string) bool {
+	if be, ok := b.errors.Get(host); ok {
+		return be.count.Load() > 10
+	}
+	return false
+}

cmd/strelaypoolsrv/main_test.go

@@ -11,6 +11,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http/httptest"
+	"net/url"
 	"strings"
 	"sync"
 	"testing"
@@ -65,3 +66,29 @@ func TestHandleGetRequest(t *testing.T) {
 		}
 	}
 }
+
+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)
+	}
+}

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),
 	)
 }
 

cmd/strelaysrv/listener.go

@@ -20,10 +20,10 @@ import (
 var (
 	outboxesMut    = sync.RWMutex{}
 	outboxes       = make(map[syncthingprotocol.DeviceID]chan interface{})
-	numConnections int64
+	numConnections atomic.Int64
 )
 
-func listener(proto, addr string, config *tls.Config) {
+func listener(_, addr string, config *tls.Config, token string) {
 	tcpListener, err := net.Listen("tcp", addr)
 	if err != nil {
 		log.Fatalln(err)
@@ -36,8 +36,14 @@ func listener(proto, addr string, config *tls.Config) {
 	for {
 		conn, isTLS, err := listener.AcceptNoWrapTLS()
 		if err != nil {
+			// Conn may be nil if accept failed, or non-nil if the initial
+			// read to figure out if it's TLS or not failed. In the latter
+			// case, close the connection before moving on.
+			if conn != nil {
+				conn.Close()
+			}
 			if debug {
-				log.Println("Listener failed to accept connection from", conn.RemoteAddr(), ". Possibly a TCP Ping.")
+				log.Println("Listener failed to accept:", err)
 			}
 			continue
 		}
@@ -49,7 +55,7 @@ func listener(proto, addr string, config *tls.Config) {
 		}
 
 		if isTLS {
-			go protocolConnectionHandler(conn, config)
+			go protocolConnectionHandler(conn, config, token)
 		} else {
 			go sessionConnectionHandler(conn)
 		}
@@ -57,7 +63,7 @@ func listener(proto, addr string, config *tls.Config) {
 	}
 }
 
-func protocolConnectionHandler(tcpConn net.Conn, config *tls.Config) {
+func protocolConnectionHandler(tcpConn net.Conn, config *tls.Config, token string) {
 	conn := tls.Server(tcpConn, config)
 	if err := conn.SetDeadline(time.Now().Add(messageTimeout)); err != nil {
 		if debug {
@@ -76,7 +82,7 @@ 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")
 	}
 
@@ -119,7 +125,16 @@ func protocolConnectionHandler(tcpConn net.Conn, config *tls.Config) {
 
 			switch msg := message.(type) {
 			case protocol.JoinRelayRequest:
-				if atomic.LoadInt32(&overLimit) > 0 {
+				if token != "" && msg.Token != token {
+					if debug {
+						log.Printf("invalid token %s\n", msg.Token)
+					}
+					protocol.WriteMessage(conn, protocol.ResponseWrongToken)
+					conn.Close()
+					continue
+				}
+
+				if overLimit.Load() {
 					protocol.WriteMessage(conn, protocol.RelayFull{})
 					if debug {
 						log.Println("Refusing join request from", id, "due to being over limits")
@@ -258,7 +273,7 @@ func protocolConnectionHandler(tcpConn net.Conn, config *tls.Config) {
 				conn.Close()
 			}
 
-			if atomic.LoadInt32(&overLimit) > 0 && !hasSessions(id) {
+			if overLimit.Load() && !hasSessions(id) {
 				if debug {
 					log.Println("Dropping", id, "as it has no sessions and we are over our limits")
 				}
@@ -351,8 +366,8 @@ func sessionConnectionHandler(conn net.Conn) {
 }
 
 func messageReader(conn net.Conn, messages chan<- interface{}, errors chan<- error) {
-	atomic.AddInt64(&numConnections, 1)
-	defer atomic.AddInt64(&numConnections, -1)
+	numConnections.Add(1)
+	defer numConnections.Add(-1)
 
 	for {
 		msg, err := protocol.ReadMessage(conn)

cmd/strelaysrv/main.go

@@ -14,7 +14,6 @@ import (
 	"os"
 	"os/signal"
 	"path/filepath"
-	"runtime"
 	"strings"
 	"sync/atomic"
 	"syscall"
@@ -50,13 +49,14 @@ var (
 
 	sessionLimitBps   int
 	globalLimitBps    int
-	overLimit         int32
+	overLimit         atomic.Bool
 	descriptorLimit   int64
 	sessionLimiter    *rate.Limiter
 	globalLimiter     *rate.Limiter
 	networkBufferSize int
 
 	statusAddr       string
+	token            string
 	poolAddrs        string
 	pools            []string
 	providedBy       string
@@ -90,6 +90,7 @@ func main() {
 	flag.IntVar(&globalLimitBps, "global-rate", globalLimitBps, "Global rate limit, in bytes/s")
 	flag.BoolVar(&debug, "debug", debug, "Enable debug output")
 	flag.StringVar(&statusAddr, "status-srv", ":22070", "Listen address for status service (blank to disable)")
+	flag.StringVar(&token, "token", "", "Token to restrict access to the relay (optional). Disables joining any pools.")
 	flag.StringVar(&poolAddrs, "pools", defaultPoolAddrs, "Comma separated list of relay pool addresses to join")
 	flag.StringVar(&providedBy, "provided-by", "", "An optional description about who provides the relay")
 	flag.StringVar(&extAddress, "ext-address", "", "An optional address to advertise as being available on.\n\tAllows listening on an unprivileged port with port forwarding from e.g. 443, and be connected to on port 443.")
@@ -146,7 +147,7 @@ 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)
 	}
 
@@ -193,7 +194,15 @@ func main() {
 		cfg.Options.NATTimeoutS = natTimeout
 	})
 	natSvc := nat.NewService(id, wrapper)
-	mapping := mapping{natSvc.NewMapping(nat.TCP, addr.IP, addr.Port)}
+	var ipVersion nat.IPVersion
+	if strings.HasSuffix(proto, "4") {
+		ipVersion = nat.IPv4Only
+	} else if strings.HasSuffix(proto, "6") {
+		ipVersion = nat.IPv6Only
+	} else {
+		ipVersion = nat.IPvAny
+	}
+	mapping := mapping{natSvc.NewMapping(nat.TCP, ipVersion, addr.IP, addr.Port)}
 
 	if natEnabled {
 		ctx, cancel := context.WithCancel(context.Background())
@@ -230,14 +239,37 @@ 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 token != "" {
+		poolAddrs = ""
+	}
+
 	if poolAddrs == defaultPoolAddrs {
 		log.Println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")
 		log.Println("!!  Joining default relay pools, this relay will be available for public use. !!")
@@ -253,7 +285,7 @@ func main() {
 		}
 	}
 
-	go listener(proto, listen, tlsCfg)
+	go listener(proto, listen, tlsCfg, token)
 
 	sigs := make(chan os.Signal, 1)
 	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
@@ -284,10 +316,10 @@ func main() {
 func monitorLimits() {
 	limitCheckTimer = time.NewTimer(time.Minute)
 	for range limitCheckTimer.C {
-		if atomic.LoadInt64(&numConnections)+atomic.LoadInt64(&numProxies) > descriptorLimit {
-			atomic.StoreInt32(&overLimit, 1)
+		if numConnections.Load()+numProxies.Load() > descriptorLimit {
+			overLimit.Store(true)
 			log.Println("Gone past our connection limits. Starting to refuse new/drop idle connections.")
-		} else if atomic.CompareAndSwapInt32(&overLimit, 1, 0) {
+		} else if overLimit.CompareAndSwap(true, false) {
 			log.Println("Dropped below our connection limits. Accepting new connections.")
 		}
 		limitCheckTimer.Reset(time.Minute)

cmd/strelaysrv/pool.go

@@ -74,9 +74,8 @@ func poolHandler(pool string, uri *url.URL, mapping mapping, ownCert tls.Certifi
 				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)

cmd/strelaysrv/session.go

@@ -23,8 +23,8 @@ var (
 	sessionMut      = sync.RWMutex{}
 	activeSessions  = make([]*session, 0)
 	pendingSessions = make(map[string]*session)
-	numProxies      int64
-	bytesProxied    int64
+	numProxies      atomic.Int64
+	bytesProxied    atomic.Int64
 )
 
 func newSession(serverid, clientid syncthingprotocol.DeviceID, sessionRateLimit, globalRateLimit *rate.Limiter) *session {
@@ -251,8 +251,8 @@ func (s *session) proxy(c1, c2 net.Conn) error {
 		log.Println("Proxy", c1.RemoteAddr(), "->", c2.RemoteAddr())
 	}
 
-	atomic.AddInt64(&numProxies, 1)
-	defer atomic.AddInt64(&numProxies, -1)
+	numProxies.Add(1)
+	defer numProxies.Add(-1)
 
 	buf := make([]byte, networkBufferSize)
 	for {
@@ -262,7 +262,7 @@ func (s *session) proxy(c1, c2 net.Conn) error {
 			return err
 		}
 
-		atomic.AddInt64(&bytesProxied, int64(n))
+		bytesProxied.Add(int64(n))
 
 		if debug {
 			log.Printf("%d bytes from %s to %s", n, c1.RemoteAddr(), c2.RemoteAddr())

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{})
 
@@ -51,9 +51,9 @@ func getStatus(w http.ResponseWriter, r *http.Request) {
 	status["numPendingSessionKeys"] = len(pendingSessions)
 	status["numActiveSessions"] = len(activeSessions)
 	sessionMut.Unlock()
-	status["numConnections"] = atomic.LoadInt64(&numConnections)
-	status["numProxies"] = atomic.LoadInt64(&numProxies)
-	status["bytesProxied"] = atomic.LoadInt64(&bytesProxied)
+	status["numConnections"] = numConnections.Load()
+	status["numProxies"] = numProxies.Load()
+	status["bytesProxied"] = bytesProxied.Load()
 	status["goVersion"] = runtime.Version()
 	status["goOS"] = runtime.GOOS
 	status["goArch"] = runtime.GOARCH
@@ -88,13 +88,13 @@ func getStatus(w http.ResponseWriter, r *http.Request) {
 }
 
 type rateCalculator struct {
-	counter   *int64 // atomic, must remain 64-bit aligned
+	counter   *atomic.Int64
 	rates     []int64
 	prev      int64
 	startTime time.Time
 }
 
-func newRateCalculator(keepIntervals int, interval time.Duration, counter *int64) *rateCalculator {
+func newRateCalculator(keepIntervals int, interval time.Duration, counter *atomic.Int64) *rateCalculator {
 	r := &rateCalculator{
 		rates:     make([]int64, keepIntervals),
 		counter:   counter,
@@ -112,7 +112,7 @@ func (r *rateCalculator) updateRates(interval time.Duration) {
 		next := now.Truncate(interval).Add(interval)
 		time.Sleep(next.Sub(now))
 
-		cur := atomic.LoadInt64(r.counter)
+		cur := r.counter.Load()
 		rate := int64(float64(cur-r.prev) / interval.Seconds())
 		copy(r.rates[1:], r.rates)
 		r.rates[0] = rate

cmd/strelaysrv/testutil/main.go

@@ -127,10 +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))

cmd/stupgrades/main.go

@@ -7,31 +7,122 @@
 package main
 
 import (
+	"bytes"
 	"encoding/json"
-	"flag"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
 	"os"
 	"sort"
+	"strings"
+	"time"
 
+	"github.com/alecthomas/kong"
+	"github.com/syncthing/syncthing/lib/httpcache"
 	"github.com/syncthing/syncthing/lib/upgrade"
 )
 
-const defaultURL = "https://api.github.com/repos/syncthing/syncthing/releases?per_page=25"
+type cli struct {
+	Listen    string        `default:":8080" help:"Listen address"`
+	URL       string        `short:"u" default:"https://api.github.com/repos/syncthing/syncthing/releases?per_page=25" help:"GitHub releases url"`
+	Forward   []string      `short:"f" help:"Forwarded pages, format: /path->https://example/com/url"`
+	CacheTime time.Duration `default:"15m" help:"Cache time"`
+}
 
 func main() {
-	url := flag.String("u", defaultURL, "GitHub releases url")
-	flag.Parse()
-
-	rels := upgrade.FetchLatestReleases(*url, "")
-	if rels == nil {
-		// An error was already logged
+	var params cli
+	kong.Parse(&params)
+	if err := server(&params); err != nil {
+		fmt.Printf("Error: %v\n", err)
 		os.Exit(1)
 	}
+}
+
+func server(params *cli) error {
+	http.Handle("/meta.json", httpcache.SinglePath(&githubReleases{url: params.URL}, params.CacheTime))
+
+	for _, fwd := range params.Forward {
+		path, url, ok := strings.Cut(fwd, "->")
+		if !ok {
+			return fmt.Errorf("invalid forward: %q", fwd)
+		}
+		http.Handle(path, httpcache.SinglePath(&proxy{url: url}, params.CacheTime))
+	}
+
+	return http.ListenAndServe(params.Listen, nil)
+}
+
+type githubReleases struct {
+	url string
+}
+
+func (p *githubReleases) ServeHTTP(w http.ResponseWriter, _ *http.Request) {
+	log.Println("Fetching", p.url)
+	rels := upgrade.FetchLatestReleases(p.url, "")
+	if rels == nil {
+		http.Error(w, "no releases", http.StatusInternalServerError)
+		return
+	}
 
 	sort.Sort(upgrade.SortByRelease(rels))
 	rels = filterForLatest(rels)
 
-	if err := json.NewEncoder(os.Stdout).Encode(rels); err != nil {
-		os.Exit(1)
+	// Move the URL used for browser downloads to the URL field, and remove
+	// the browser URL field. This avoids going via the GitHub API for
+	// downloads, since Syncthing uses the URL field.
+	for _, rel := range rels {
+		for j, asset := range rel.Assets {
+			rel.Assets[j].URL = asset.BrowserURL
+			rel.Assets[j].BrowserURL = ""
+		}
+	}
+
+	buf := new(bytes.Buffer)
+	_ = json.NewEncoder(buf).Encode(rels)
+
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	w.Header().Set("Access-Control-Allow-Origin", "*")
+	w.Header().Set("Access-Control-Allow-Methods", "GET")
+	w.Write(buf.Bytes())
+}
+
+type proxy struct {
+	url string
+}
+
+func (p *proxy) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	log.Println("Fetching", p.url)
+	req, err := http.NewRequestWithContext(req.Context(), http.MethodGet, p.url, nil)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	defer resp.Body.Close()
+
+	ct := resp.Header.Get("Content-Type")
+	w.Header().Set("Content-Type", ct)
+	if resp.StatusCode == http.StatusOK {
+		w.Header().Set("Cache-Control", "public, max-age=900")
+		w.Header().Set("Access-Control-Allow-Origin", "*")
+		w.Header().Set("Access-Control-Allow-Methods", "GET")
+	}
+	w.WriteHeader(resp.StatusCode)
+	if strings.HasPrefix(ct, "application/json") {
+		// Special JSON handling; clean it up a bit.
+		var v interface{}
+		if err := json.NewDecoder(resp.Body).Decode(&v); err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		_ = json.NewEncoder(w).Encode(v)
+	} else {
+		_, _ = io.Copy(w, resp.Body)
 	}
 }
 

cmd/stvanity/main.go

@@ -44,7 +44,7 @@ func main() {
 
 	found := make(chan result)
 	stop := make(chan struct{})
-	var count int64
+	var count atomic.Int64
 
 	// Print periodic progress reports.
 	go printProgress(prefix, &count)
@@ -72,7 +72,7 @@ func main() {
 // Try certificates until one is found that has the prefix at the start of
 // the resulting device ID. Increments count atomically, sends the result to
 // found, returns when stop is closed.
-func generatePrefixed(prefix string, count *int64, found chan<- result, stop <-chan struct{}) {
+func generatePrefixed(prefix string, count *atomic.Int64, found chan<- result, stop <-chan struct{}) {
 	notBefore := time.Now()
 	notAfter := time.Date(2049, 12, 31, 23, 59, 59, 0, time.UTC)
 
@@ -109,7 +109,7 @@ func generatePrefixed(prefix string, count *int64, found chan<- result, stop <-c
 		}
 
 		id := protocol.NewDeviceID(derBytes)
-		atomic.AddInt64(count, 1)
+		count.Add(1)
 
 		if strings.HasPrefix(id.String(), prefix) {
 			select {
@@ -121,7 +121,7 @@ func generatePrefixed(prefix string, count *int64, found chan<- result, stop <-c
 	}
 }
 
-func printProgress(prefix string, count *int64) {
+func printProgress(prefix string, count *atomic.Int64) {
 	started := time.Now()
 	wantBits := 5 * len(prefix)
 	if wantBits > 63 {
@@ -132,7 +132,7 @@ func printProgress(prefix string, count *int64) {
 	fmt.Printf("Want %d bits for prefix %q, about %.2g certs to test (statistically speaking)\n", wantBits, prefix, expectedIterations)
 
 	for range time.NewTicker(15 * time.Second).C {
-		tried := atomic.LoadInt64(count)
+		tried := count.Load()
 		elapsed := time.Since(started)
 		rate := float64(tried) / elapsed.Seconds()
 		expected := timeStr(expectedIterations / rate)

cmd/syncthing/cli/client.go

@@ -10,8 +10,10 @@ import (
 	"bytes"
 	"context"
 	"crypto/tls"
+	"encoding/json"
 	"errors"
 	"fmt"
+	"io"
 	"net"
 	"net/http"
 	"strings"
@@ -25,6 +27,7 @@ import (
 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 {
@@ -118,20 +121,36 @@ func (c *apiClient) Do(req *http.Request) (*http.Response, error) {
 	return resp, checkResponse(resp)
 }
 
-func (c *apiClient) Get(url string) (*http.Response, error) {
-	request, err := http.NewRequest("GET", c.Endpoint()+"rest/"+url, nil)
+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) Post(url, body string) (*http.Response, error) {
-	request, err := http.NewRequest("POST", c.Endpoint()+"rest/"+url, bytes.NewBufferString(body))
+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.Do(request)
+	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")

cmd/syncthing/cli/config.go

@@ -8,11 +8,12 @@ package cli
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"reflect"
 
 	"github.com/AudriusButkevicius/recli"
-	"github.com/pkg/errors"
+	"github.com/alecthomas/kong"
 	"github.com/syncthing/syncthing/lib/config"
 	"github.com/urfave/cli"
 )
@@ -23,9 +24,20 @@ type configHandler struct {
 	err           error
 }
 
-func getConfigCommand(f *apiClientFactory) (cli.Command, error) {
+type configCommand struct {
+	Args []string `arg:"" default:"-h"`
+}
+
+func (c *configCommand) Run(ctx Context, _ *kong.Context) error {
+	app := cli.NewApp()
+	app.Name = "syncthing"
+	app.Author = "The Syncthing Authors"
+	app.Metadata = map[string]interface{}{
+		"clientFactory": ctx.clientFactory,
+	}
+
 	h := new(configHandler)
-	h.client, h.err = f.getClient()
+	h.client, h.err = ctx.clientFactory.getClient()
 	if h.err == nil {
 		h.cfg, h.err = getConfig(h.client)
 	}
@@ -38,17 +50,15 @@ func getConfigCommand(f *apiClientFactory) (cli.Command, error) {
 
 	commands, err := recli.New(recliCfg).Construct(&h.cfg)
 	if err != nil {
-		return cli.Command{}, fmt.Errorf("config reflect: %w", err)
+		return 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
+	app.Commands = commands
+	app.HideHelp = true
+	app.Before = h.configBefore
+	app.After = h.configAfter
+
+	return app.Run(append([]string{app.Name}, c.Args...))
 }
 
 func (h *configHandler) configBefore(c *cli.Context) error {
@@ -60,7 +70,7 @@ func (h *configHandler) configBefore(c *cli.Context) error {
 	return h.err
 }
 
-func (h *configHandler) configAfter(c *cli.Context) error {
+func (h *configHandler) configAfter(_ *cli.Context) error {
 	if h.err != nil {
 		// Error was already returned in configBefore
 		return nil

cmd/syncthing/cli/debug.go

@@ -9,47 +9,37 @@ 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()),
-		},
-	},
+type fileCommand struct {
+	FolderID string `arg:""`
+	Path     string `arg:""`
 }
 
-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 (f *fileCommand) Run(ctx Context) error {
+	indexDumpOutput := indexDumpOutputWrapper(ctx.clientFactory)
+
+	query := make(url.Values)
+	query.Set("folder", f.FolderID)
+	query.Set("file", normalizePath(f.Path))
+	return indexDumpOutput("debug/file?" + query.Encode())
+}
+
+type profileCommand struct {
+	Type string `arg:"" help:"cpu | heap"`
+}
+
+func (p *profileCommand) Run(ctx Context) error {
+	switch t := p.Type; t {
+	case "cpu", "heap":
+		return saveToFile(fmt.Sprintf("debug/%vprof", p.Type), ctx.clientFactory)
+	default:
+		return fmt.Errorf("expected cpu or heap as argument, got %v", t)
 	}
 }
 
-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)
-		}
-	}
+type debugCommand struct {
+	File    fileCommand    `cmd:"" help:"Show information about a file (or directory/symlink)"`
+	Profile profileCommand `cmd:"" help:"Save a profile to help figuring out what Syncthing does"`
+	Index   indexCommand   `cmd:"" help:"Show information about the index (database)"`
 }

cmd/syncthing/cli/errors.go

@@ -11,36 +11,25 @@ import (
 	"fmt"
 	"strings"
 
-	"github.com/urfave/cli"
+	"github.com/alecthomas/kong"
 )
 
-var errorsCommand = cli.Command{
-	Name:     "errors",
-	HideHelp: true,
-	Usage:    "Error command group",
-	Subcommands: []cli.Command{
-		{
-			Name:   "show",
-			Usage:  "Show pending errors",
-			Action: expects(0, indexDumpOutput("system/error")),
-		},
-		{
-			Name:      "push",
-			Usage:     "Push an error to active clients",
-			ArgsUsage: "[error message]",
-			Action:    expects(1, errorsPush),
-		},
-		{
-			Name:   "clear",
-			Usage:  "Clear pending errors",
-			Action: expects(0, emptyPost("system/error/clear")),
-		},
-	},
+type errorsCommand struct {
+	Show  struct{}          `cmd:"" help:"Show pending errors"`
+	Push  errorsPushCommand `cmd:"" help:"Push an error to active clients"`
+	Clear struct{}          `cmd:"" help:"Clear pending errors"`
 }
 
-func errorsPush(c *cli.Context) error {
-	client := c.App.Metadata["client"].(APIClient)
-	errStr := strings.Join(c.Args(), " ")
+type errorsPushCommand struct {
+	ErrorMessage string `arg:""`
+}
+
+func (e *errorsPushCommand) Run(ctx Context) error {
+	client, err := ctx.clientFactory.getClient()
+	if err != nil {
+		return err
+	}
+	errStr := e.ErrorMessage
 	response, err := client.Post("system/error", strings.TrimSpace(errStr))
 	if err != nil {
 		return err
@@ -59,3 +48,13 @@ func errorsPush(c *cli.Context) error {
 	}
 	return nil
 }
+
+func (*errorsCommand) Run(ctx Context, kongCtx *kong.Context) error {
+	switch kongCtx.Selected().Name {
+	case "show":
+		return indexDumpOutput("system/error", ctx.clientFactory)
+	case "clear":
+		return emptyPost("system/error/clear", ctx.clientFactory)
+	}
+	return nil
+}

cmd/syncthing/cli/index.go

@@ -7,32 +7,26 @@
 package cli
 
 import (
-	"github.com/urfave/cli"
+	"github.com/alecthomas/kong"
 )
 
-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),
-		},
-	},
+type indexCommand struct {
+	Dump     struct{} `cmd:"" help:"Print the entire db"`
+	DumpSize struct{} `cmd:"" help:"Print the db size of different categories of information"`
+	Check    struct{} `cmd:"" help:"Check the database for inconsistencies"`
+	Account  struct{} `cmd:"" help:"Print key and value size statistics per key type"`
+}
+
+func (*indexCommand) Run(kongCtx *kong.Context) error {
+	switch kongCtx.Selected().Name {
+	case "dump":
+		return indexDump()
+	case "dump-size":
+		return indexDumpSize()
+	case "check":
+		return indexCheck()
+	case "account":
+		return indexAccount()
+	}
+	return nil
 }

cmd/syncthing/cli/index_accounting.go

@@ -10,12 +10,10 @@ import (
 	"fmt"
 	"os"
 	"text/tabwriter"
-
-	"github.com/urfave/cli"
 )
 
 // indexAccount prints key and data size statistics per class
-func indexAccount(*cli.Context) error {
+func indexAccount() error {
 	ldb, err := getDB()
 	if err != nil {
 		return err

cmd/syncthing/cli/index_dump.go

@@ -11,13 +11,11 @@ import (
 	"fmt"
 	"time"
 
-	"github.com/urfave/cli"
-
 	"github.com/syncthing/syncthing/lib/db"
 	"github.com/syncthing/syncthing/lib/protocol"
 )
 
-func indexDump(*cli.Context) error {
+func indexDump() error {
 	ldb, err := getDB()
 	if err != nil {
 		return err

cmd/syncthing/cli/index_dumpsize.go

@@ -11,12 +11,10 @@ import (
 	"fmt"
 	"sort"
 
-	"github.com/urfave/cli"
-
 	"github.com/syncthing/syncthing/lib/db"
 )
 
-func indexDumpSize(*cli.Context) error {
+func indexDumpSize() error {
 	type sizedElement struct {
 		key  string
 		size int

cmd/syncthing/cli/index_idxck.go

@@ -13,8 +13,6 @@ import (
 	"fmt"
 	"sort"
 
-	"github.com/urfave/cli"
-
 	"github.com/syncthing/syncthing/lib/db"
 	"github.com/syncthing/syncthing/lib/protocol"
 )
@@ -35,7 +33,7 @@ type sequenceKey struct {
 	sequence uint64
 }
 
-func indexCheck(*cli.Context) (err error) {
+func indexCheck() (err error) {
 	ldb, err := getDB()
 	if err != nil {
 		return err
@@ -57,7 +55,7 @@ func indexCheck(*cli.Context) (err error) {
 	defer func() {
 		if err == nil {
 			if success {
-				fmt.Println("Index check completed succesfully.")
+				fmt.Println("Index check completed successfully.")
 			} else {
 				err = errors.New("Inconsistencies found in the index")
 			}
@@ -349,7 +347,7 @@ func indexCheck(*cli.Context) (err error) {
 
 func needsLocally(vl db.VersionList) bool {
 	gfv, gok := vl.GetGlobal()
-	if !gok { // That's weird, but we hardly need something non-existant
+	if !gok { // That's weird, but we hardly need something non-existent
 		return false
 	}
 	fv, ok := vl.Get(protocol.LocalDeviceID[:])

cmd/syncthing/cli/main.go

@@ -9,152 +9,87 @@ package cli
 import (
 	"bufio"
 	"fmt"
-	"io"
 	"os"
-	"strings"
 
 	"github.com/alecthomas/kong"
 	"github.com/flynn-archive/go-shlex"
-	"github.com/pkg/errors"
-	"github.com/urfave/cli"
 
 	"github.com/syncthing/syncthing/cmd/syncthing/cmdutil"
 	"github.com/syncthing/syncthing/lib/config"
 )
 
-type preCli struct {
+type CLI struct {
+	cmdutil.CommonOptions
+	DataDir    string `name:"data" placeholder:"PATH" env:"STDATADIR" help:"Set data directory (database and logs)"`
 	GUIAddress string `name:"gui-address"`
 	GUIAPIKey  string `name:"gui-apikey"`
-	HomeDir    string `name:"home"`
-	ConfDir    string `name:"config"`
-	DataDir    string `name:"data"`
+
+	Show       showCommand      `cmd:"" help:"Show command group"`
+	Debug      debugCommand     `cmd:"" help:"Debug command group"`
+	Operations operationCommand `cmd:"" help:"Operation command group"`
+	Errors     errorsCommand    `cmd:"" help:"Error command group"`
+	Config     configCommand    `cmd:"" help:"Configuration modification command group" passthrough:""`
+	Stdin      stdinCommand     `cmd:"" name:"-" help:"Read commands from stdin"`
 }
 
-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)
+type Context struct {
+	clientFactory *apiClientFactory
+}
 
-	// Not set as default above because the strings can be really long.
-	err := cmdutil.SetConfigDataLocationsFromFlags(c.HomeDir, c.ConfDir, c.DataDir)
+func (cli CLI) AfterApply(kongCtx *kong.Context) error {
+	err := cmdutil.SetConfigDataLocationsFromFlags(cli.HomeDir, cli.ConfDir, cli.DataDir)
 	if err != nil {
-		return errors.Wrap(err, "Command line options:")
+		return fmt.Errorf("command line options: %w", err)
 	}
+
 	clientFactory := &apiClientFactory{
 		cfg: config.GUIConfiguration{
-			RawAddress: c.GUIAddress,
-			APIKey:     c.GUIAPIKey,
+			RawAddress: cli.GUIAddress,
+			APIKey:     cli.GUIAPIKey,
 		},
 	}
 
-	configCommand, err := getConfigCommand(clientFactory)
-	if err != nil {
-		return err
+	context := Context{
+		clientFactory: clientFactory,
 	}
 
-	// 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(os.Args)-1)
-					copy(args, os.Args)
-
-					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 errors.Wrap(err, "parsing input")
-						}
-						if len(input) == 0 {
-							continue
-						}
-						err = app.Run(append(args, input...))
-						if err != nil {
-							return err
-						}
-					}
-					return scanner.Err()
-				},
-			},
-		},
-	}}
-
-	return app.Run(os.Args)
+	kongCtx.Bind(context)
+	return nil
 }
 
-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
-	}
-	args := os.Args[2:]
-	for i := 0; i < len(args); i++ {
-		if !strings.HasPrefix(args[i], "--") {
-			args = args[:i]
-			break
+type stdinCommand struct{}
+
+func (*stdinCommand) Run() error {
+	// Drop the `-` not to recurse into self.
+	args := make([]string, len(os.Args)-1)
+	copy(args, os.Args)
+
+	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 !strings.Contains(args[i], "=") {
-			i++
+		if len(input) == 0 {
+			continue
+		}
+
+		var cli CLI
+		p, err := kong.New(&cli)
+		if err != nil {
+			// can't happen, really
+			return fmt.Errorf("creating parser: %w", err)
+		}
+		ctx, err := p.Parse(input)
+		if err != nil {
+			fmt.Println("Error:", err)
+			continue
+		}
+		if err := ctx.Run(); err != nil {
+			fmt.Println("Error:", err)
+			continue
 		}
 	}
-	// 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
+	return scanner.Err()
 }

cmd/syncthing/cli/operations.go

@@ -7,42 +7,48 @@
 package cli
 
 import (
+	"bufio"
+	"errors"
 	"fmt"
+	"path/filepath"
 
-	"github.com/urfave/cli"
+	"github.com/alecthomas/kong"
+	"github.com/syncthing/syncthing/lib/config"
+	"github.com/syncthing/syncthing/lib/fs"
 )
 
-var operationCommand = cli.Command{
-	Name:     "operations",
-	HideHelp: true,
-	Usage:    "Operation command group",
-	Subcommands: []cli.Command{
-		{
-			Name:   "restart",
-			Usage:  "Restart syncthing",
-			Action: expects(0, emptyPost("system/restart")),
-		},
-		{
-			Name:   "shutdown",
-			Usage:  "Shutdown syncthing",
-			Action: expects(0, emptyPost("system/shutdown")),
-		},
-		{
-			Name:   "upgrade",
-			Usage:  "Upgrade syncthing (if a newer version is available)",
-			Action: expects(0, emptyPost("system/upgrade")),
-		},
-		{
-			Name:      "folder-override",
-			Usage:     "Override changes on folder (remote for sendonly, local for receiveonly). WARNING: Destructive - deletes/changes your data.",
-			ArgsUsage: "[folder id]",
-			Action:    expects(1, foldersOverride),
-		},
-	},
+type folderOverrideCommand struct {
+	FolderID string `arg:""`
 }
 
-func foldersOverride(c *cli.Context) error {
-	client, err := getClientFactory(c).getClient()
+type defaultIgnoresCommand struct {
+	Path string `arg:""`
+}
+
+type operationCommand struct {
+	Restart        struct{}              `cmd:"" help:"Restart syncthing"`
+	Shutdown       struct{}              `cmd:"" help:"Shutdown syncthing"`
+	Upgrade        struct{}              `cmd:"" help:"Upgrade syncthing (if a newer version is available)"`
+	FolderOverride folderOverrideCommand `cmd:"" help:"Override changes on folder (remote for sendonly, local for receiveonly). WARNING: Destructive - deletes/changes your data"`
+	DefaultIgnores defaultIgnoresCommand `cmd:"" help:"Set the default ignores (config) from a file"`
+}
+
+func (*operationCommand) Run(ctx Context, kongCtx *kong.Context) error {
+	f := ctx.clientFactory
+
+	switch kongCtx.Selected().Name {
+	case "restart":
+		return emptyPost("system/restart", f)
+	case "shutdown":
+		return emptyPost("system/shutdown", f)
+	case "upgrade":
+		return emptyPost("system/upgrade", f)
+	}
+	return nil
+}
+
+func (f *folderOverrideCommand) Run(ctx Context) error {
+	client, err := ctx.clientFactory.getClient()
 	if err != nil {
 		return err
 	}
@@ -50,7 +56,7 @@ func foldersOverride(c *cli.Context) error {
 	if err != nil {
 		return err
 	}
-	rid := c.Args()[0]
+	rid := f.FolderID
 	for _, folder := range cfg.Folders {
 		if folder.ID == rid {
 			response, err := client.Post("db/override", "")
@@ -67,10 +73,36 @@ 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 (d *defaultIgnoresCommand) Run(ctx Context) error {
+	client, err := ctx.clientFactory.getClient()
+	if err != nil {
+		return err
+	}
+	dir, file := filepath.Split(d.Path)
+	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
 }

cmd/syncthing/cli/pending.go

@@ -7,23 +7,32 @@
 package cli
 
 import (
-	"github.com/urfave/cli"
+	"net/url"
+
+	"github.com/alecthomas/kong"
 )
 
-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",
-			Action: expects(0, indexDumpOutput("cluster/pending/folders")),
-		},
-	},
+type pendingCommand struct {
+	Devices struct{} `cmd:"" help:"Show pending devices"`
+	Folders struct {
+		Device string `help:"Show pending folders offered by given device"`
+	} `cmd:"" help:"Show pending folders"`
+}
+
+func (p *pendingCommand) Run(ctx Context, kongCtx *kong.Context) error {
+	indexDumpOutput := indexDumpOutputWrapper(ctx.clientFactory)
+
+	switch kongCtx.Selected().Name {
+	case "devices":
+		return indexDumpOutput("cluster/pending/devices")
+	case "folders":
+		if p.Folders.Device != "" {
+			query := make(url.Values)
+			query.Set("device", p.Folders.Device)
+			return indexDumpOutput("cluster/pending/folders?" + query.Encode())
+		}
+		return indexDumpOutput("cluster/pending/folders")
+	}
+
+	return nil
 }

cmd/syncthing/cli/show.go

@@ -7,39 +7,36 @@
 package cli
 
 import (
-	"github.com/urfave/cli"
+	"github.com/alecthomas/kong"
 )
 
-var showCommand = cli.Command{
-	Name:     "show",
-	HideHelp: true,
-	Usage:    "Show command group",
-	Subcommands: []cli.Command{
-		{
-			Name:   "version",
-			Usage:  "Show syncthing client 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, indexDumpOutput("config/restart-required")),
-		},
-		{
-			Name:   "system",
-			Usage:  "Show system status",
-			Action: expects(0, indexDumpOutput("system/status")),
-		},
-		{
-			Name:   "connections",
-			Usage:  "Report about connections to other devices",
-			Action: expects(0, indexDumpOutput("system/connections")),
-		},
-		pendingCommand,
-		{
-			Name:   "usage",
-			Usage:  "Show usage report",
-			Action: expects(0, indexDumpOutput("svc/report")),
-		},
-	},
+type showCommand struct {
+	Version      struct{}       `cmd:"" help:"Show syncthing client version"`
+	ConfigStatus struct{}       `cmd:"" help:"Show configuration status, whether or not a restart is required for changes to take effect"`
+	System       struct{}       `cmd:"" help:"Show system status"`
+	Connections  struct{}       `cmd:"" help:"Report about connections to other devices"`
+	Discovery    struct{}       `cmd:"" help:"Show the discovered addresses of remote devices (from cache of the running syncthing instance)"`
+	Usage        struct{}       `cmd:"" help:"Show usage report"`
+	Pending      pendingCommand `cmd:"" help:"Pending subcommand group"`
+}
+
+func (*showCommand) Run(ctx Context, kongCtx *kong.Context) error {
+	indexDumpOutput := indexDumpOutputWrapper(ctx.clientFactory)
+
+	switch kongCtx.Selected().Name {
+	case "version":
+		return indexDumpOutput("system/version")
+	case "config-status":
+		return indexDumpOutput("config/restart-required")
+	case "system":
+		return indexDumpOutput("system/status")
+	case "connections":
+		return indexDumpOutput("system/connections")
+	case "discovery":
+		return indexDumpOutput("system/discovery")
+	case "usage":
+		return indexDumpOutput("svc/report")
+	}
+
+	return nil
 }

cmd/syncthing/cli/utils.go

@@ -19,7 +19,6 @@ import (
 	"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) {
@@ -30,68 +29,72 @@ func responseToBArray(response *http.Response) ([]byte, error) {
 	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, "")
+func emptyPost(url string, apiClientFactory *apiClientFactory) error {
+	client, err := apiClientFactory.getClient()
+	if err != nil {
 		return err
 	}
+	_, err = client.Post(url, "")
+	return err
+}
+
+func indexDumpOutputWrapper(apiClientFactory *apiClientFactory) func(url string) error {
+	return func(url string) error {
+		return indexDumpOutput(url, apiClientFactory)
+	}
 }
 
-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)
+func indexDumpOutput(url string, apiClientFactory *apiClientFactory) error {
+	client, err := apiClientFactory.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, apiClientFactory *apiClientFactory) error {
+	client, err := apiClientFactory.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
+	}
+	_, err = f.Write(bs)
+	if err != nil {
+		_ = f.Close()
+		return err
+	}
+	err = f.Close()
+	if err != nil {
+		return err
+	}
+	fmt.Println("Wrote results to", filename)
+	return nil
 }
 
 func getConfig(c APIClient) (config.Configuration, error) {
@@ -105,25 +108,12 @@ func getConfig(c APIClient) (config.Configuration, error) {
 		return cfg, err
 	}
 	err = json.Unmarshal(bytes, &cfg)
-	if err == nil {
-		return cfg, err
+	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("", "  ")
@@ -159,7 +149,3 @@ func nulString(bs []byte) string {
 func normalizePath(path string) string {
 	return filepath.ToSlash(filepath.Clean(path))
 }
-
-func getClientFactory(c *cli.Context) *apiClientFactory {
-	return c.App.Metadata["clientFactory"].(*apiClientFactory)
-}

cmd/syncthing/cmdutil/options_common.go

@@ -9,7 +9,8 @@ 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"`
+	ConfDir         string `name:"config" placeholder:"PATH" env:"STCONFDIR" help:"Set configuration directory (config and keys)"`
+	HomeDir         string `name:"home" placeholder:"PATH" env:"STHOMEDIR" 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"`
 }

cmd/syncthing/decrypt/decrypt.go

@@ -10,6 +10,7 @@ package decrypt
 import (
 	"encoding/binary"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"log"
@@ -34,6 +35,7 @@ type CLI struct {
 	TokenPath  string `placeholder:"PATH" help:"Path to the token file within the folder (used to determine folder ID)"`
 
 	folderKey *[32]byte
+	keyGen    *protocol.KeyGenerator
 }
 
 type storedEncryptionToken struct {
@@ -45,7 +47,7 @@ func (c *CLI) Run() error {
 	log.SetFlags(0)
 
 	if c.To == "" && !c.VerifyOnly {
-		return fmt.Errorf("must set --to or --verify-only")
+		return errors.New("must set --to or --verify-only")
 	}
 
 	if c.TokenPath == "" {
@@ -67,7 +69,8 @@ func (c *CLI) Run() error {
 		}
 	}
 
-	c.folderKey = protocol.KeyFromPassword(c.FolderID, c.Password)
+	c.keyGen = protocol.NewKeyGenerator()
+	c.folderKey = c.keyGen.KeyFromPassword(c.FolderID, c.Password)
 
 	return c.walk()
 }
@@ -128,6 +131,9 @@ func (c *CLI) getFolderID() (string, error) {
 // 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)
 	}
@@ -138,7 +144,7 @@ func (c *CLI) process(srcFs fs.Filesystem, dstFs fs.Filesystem, path string) err
 	}
 	defer encFd.Close()
 
-	encFi, err := c.loadEncryptedFileInfo(encFd)
+	encFi, err := loadEncryptedFileInfo(encFd)
 	if err != nil {
 		return fmt.Errorf("%s: loading metadata trailer: %w", path, err)
 	}
@@ -147,7 +153,7 @@ func (c *CLI) process(srcFs fs.Filesystem, dstFs fs.Filesystem, path string) err
 	// in native format, while protocol expects wire format (slashes).
 	encFi.Name = osutil.NormalizedFilename(encFi.Name)
 
-	plainFi, err := protocol.DecryptFileInfo(*encFi, c.folderKey)
+	plainFi, err := protocol.DecryptFileInfo(c.keyGen, *encFi, c.folderKey)
 	if err != nil {
 		return fmt.Errorf("%s: decrypting metadata: %w", path, err)
 	}
@@ -158,7 +164,7 @@ func (c *CLI) process(srcFs fs.Filesystem, dstFs fs.Filesystem, path string) err
 
 	var plainFd fs.File
 	if dstFs != nil {
-		if err := dstFs.MkdirAll(filepath.Dir(plainFi.Name), 0700); err != nil {
+		if err := dstFs.MkdirAll(filepath.Dir(plainFi.Name), 0o700); err != nil {
 			return fmt.Errorf("%s: %w", plainFi.Name, err)
 		}
 
@@ -167,6 +173,9 @@ func (c *CLI) process(srcFs fs.Filesystem, dstFs fs.Filesystem, path string) err
 			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 {
@@ -183,7 +192,12 @@ func (c *CLI) process(srcFs fs.Filesystem, dstFs fs.Filesystem, path string) err
 	}
 
 	if plainFd != nil {
-		return plainFd.Close()
+		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
 }
@@ -197,7 +211,7 @@ func (c *CLI) decryptFile(encFi *protocol.FileInfo, plainFi *protocol.FileInfo,
 		return fmt.Errorf("block count mismatch: encrypted %d != plaintext %d", len(encFi.Blocks), len(plainFi.Blocks))
 	}
 
-	fileKey := protocol.FileKey(plainFi.Name, c.folderKey)
+	fileKey := c.keyGen.FileKey(plainFi.Name, c.folderKey)
 	for i, encBlock := range encFi.Blocks {
 		// Read the encrypted block
 		buf := make([]byte, encBlock.Size)
@@ -246,7 +260,7 @@ func (c *CLI) decryptFile(encFi *protocol.FileInfo, plainFi *protocol.FileInfo,
 
 // loadEncryptedFileInfo loads the encrypted FileInfo trailer from a file on
 // disk.
-func (c *CLI) loadEncryptedFileInfo(fd fs.File) (*protocol.FileInfo, error) {
+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

cmd/syncthing/generate/generate.go

@@ -11,8 +11,8 @@ import (
 	"bufio"
 	"context"
 	"crypto/tls"
+	"errors"
 	"fmt"
-	"log"
 	"os"
 
 	"github.com/syncthing/syncthing/cmd/syncthing/cmdutil"
@@ -20,6 +20,7 @@ import (
 	"github.com/syncthing/syncthing/lib/events"
 	"github.com/syncthing/syncthing/lib/fs"
 	"github.com/syncthing/syncthing/lib/locations"
+	"github.com/syncthing/syncthing/lib/logger"
 	"github.com/syncthing/syncthing/lib/osutil"
 	"github.com/syncthing/syncthing/lib/protocol"
 	"github.com/syncthing/syncthing/lib/syncthing"
@@ -31,16 +32,14 @@ type CLI struct {
 	GUIPassword string `placeholder:"STRING" help:"Specify new GUI authentication password (use - to read from standard input)"`
 }
 
-func (c *CLI) Run() error {
-	log.SetFlags(0)
-
+func (c *CLI) Run(l logger.Logger) error {
 	if c.HideConsole {
 		osutil.HideConsole()
 	}
 
 	if c.HomeDir != "" {
 		if c.ConfDir != "" {
-			return fmt.Errorf("--home must not be used together with --config")
+			return errors.New("--home must not be used together with --config")
 		}
 		c.ConfDir = c.HomeDir
 	}
@@ -53,24 +52,24 @@ func (c *CLI) Run() error {
 		reader := bufio.NewReader(os.Stdin)
 		password, _, err := reader.ReadLine()
 		if err != nil {
-			return fmt.Errorf("Failed reading GUI password: %w", err)
+			return fmt.Errorf("failed reading GUI password: %w", err)
 		}
 		c.GUIPassword = string(password)
 	}
 
-	if err := Generate(c.ConfDir, c.GUIUser, c.GUIPassword, c.NoDefaultFolder); err != nil {
-		return fmt.Errorf("Failed to generate config and keys: %w", err)
+	if err := Generate(l, 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 bool) error {
+func Generate(l logger.Logger, 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 {
+	if err := syncthing.EnsureDir(dir, 0o700); err != nil {
 		return err
 	}
 	locations.SetBaseDir(locations.ConfigBaseDir, dir)
@@ -79,7 +78,7 @@ func Generate(confDir, guiUser, guiPassword string, noDefaultFolder bool) error
 	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.")
+		l.Warnln("Key exists; will not overwrite.")
 	} else {
 		cert, err = syncthing.GenerateCertificate(certFile, keyFile)
 		if err != nil {
@@ -87,23 +86,16 @@ func Generate(confDir, guiUser, guiPassword string, noDefaultFolder bool) error
 		}
 	}
 	myID = protocol.NewDeviceID(cert.Certificate[0])
-	log.Println("Device ID:", myID)
+	l.Infoln("Device ID:", myID)
 
 	cfgFile := locations.Get(locations.ConfigFile)
-	var cfg config.Wrapper
-	if _, err := os.Stat(cfgFile); err == nil {
-		if guiUser == "" && guiPassword == "" {
-			log.Println("WARNING: Config exists; will not overwrite.")
-			return nil
-		}
-
-		if cfg, _, err = config.Load(cfgFile, myID, events.NoopLogger); err != nil {
-			return fmt.Errorf("load config: %w", err)
-		}
-	} else {
-		if cfg, err = syncthing.DefaultConfig(cfgFile, myID, events.NoopLogger, noDefaultFolder); err != nil {
+	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())
@@ -112,7 +104,7 @@ func Generate(confDir, guiUser, guiPassword string, noDefaultFolder bool) error
 
 	var updateErr error
 	waiter, err := cfg.Modify(func(cfg *config.Configuration) {
-		updateErr = updateGUIAuthentication(&cfg.GUI, guiUser, guiPassword)
+		updateErr = updateGUIAuthentication(l, &cfg.GUI, guiUser, guiPassword)
 	})
 	if err != nil {
 		return fmt.Errorf("modify config: %w", err)
@@ -128,17 +120,17 @@ func Generate(confDir, guiUser, guiPassword string, noDefaultFolder bool) error
 	return nil
 }
 
-func updateGUIAuthentication(guiCfg *config.GUIConfiguration, guiUser, guiPassword string) error {
+func updateGUIAuthentication(l logger.Logger, guiCfg *config.GUIConfiguration, guiUser, guiPassword string) error {
 	if guiUser != "" && guiCfg.User != guiUser {
 		guiCfg.User = guiUser
-		log.Println("Updated GUI authentication user name:", guiUser)
+		l.Infoln("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)
+		if err := guiCfg.SetPassword(guiPassword); err != nil {
+			return fmt.Errorf("failed to set GUI authentication password: %w", err)
 		}
-		log.Println("Updated GUI authentication password.")
+		l.Infoln("Updated GUI authentication password.")
 	}
 	return nil
 }

cmd/syncthing/main.go

@@ -10,6 +10,7 @@ import (
 	"bytes"
 	"context"
 	"crypto/tls"
+	"errors"
 	"fmt"
 	"io"
 	"log"
@@ -50,8 +51,6 @@ import (
 	"github.com/syncthing/syncthing/lib/svcutil"
 	"github.com/syncthing/syncthing/lib/syncthing"
 	"github.com/syncthing/syncthing/lib/upgrade"
-
-	"github.com/pkg/errors"
 )
 
 const (
@@ -68,9 +67,9 @@ The --logflags value is a sum of the following:
    8  Long filename
   16  Short filename
 
-I.e. to prefix each log line with date and time, set --logflags=3 (1 + 2 from
-above). The value 0 is used to disable all of the above. The default is to
-show time only (2).
+I.e. to prefix each log line with time and filename, set --logflags=18 (2 + 16
+from above). The value 0 is used to disable all of the above. The default is
+to show date and time (3).
 
 Logging always happens to the command line (stdout) and optionally to the
 file at the path specified by --logfile=path. In addition to an path, the special
@@ -89,9 +88,6 @@ above.
  STTRACE           A comma separated string of facilities to trace. The valid
                    facility strings are listed below.
 
- STDEADLOCKTIMEOUT Used for debugging internal deadlocks; sets debug
-                   sensitivity. Use only under direction of a developer.
-
  STLOCKTHRESHOLD   Used for debugging internal deadlocks; sets debug
                    sensitivity.  Use only under direction of a developer.
 
@@ -100,6 +96,11 @@ above.
                    "minio" for the github.com/minio/sha256-simd implementation,
                    and blank (the default) for auto detection.
 
+ STVERSIONEXTRA    Add extra information to the version string in logs and the
+                   version line in the GUI. Can be set to the name of a wrapper
+                   or tool controlling syncthing to communicate this to the end
+                   user.
+
  GOMAXPROCS        Set the maximum number of CPU cores to use. Defaults to all
                    available CPU cores.
 
@@ -135,7 +136,7 @@ var entrypoint struct {
 	Serve    serveOptions `cmd:"" help:"Run Syncthing"`
 	Generate generate.CLI `cmd:"" help:"Generate key and config, then exit"`
 	Decrypt  decrypt.CLI  `cmd:"" help:"Decrypt or verify an encrypted folder"`
-	Cli      struct{}     `cmd:"" help:"Command line interface for Syncthing"`
+	Cli      cli.CLI      `cmd:"" help:"Command line interface for Syncthing"`
 }
 
 // serveOptions are the options for the `syncthing serve` command.
@@ -145,9 +146,9 @@ type serveOptions struct {
 	Audit            bool   `help:"Write events to audit file"`
 	AuditFile        string `name:"auditfile" placeholder:"PATH" help:"Specify audit file (use \"-\" for stdout, \"--\" for stderr)"`
 	BrowserOnly      bool   `help:"Open GUI in browser"`
-	DataDir          string `name:"data" placeholder:"PATH" help:"Set data directory (database and logs)"`
+	DataDir          string `name:"data" placeholder:"PATH" env:"STDATADIR" help:"Set data directory (database and logs)"`
 	DeviceID         bool   `help:"Show the device ID"`
-	GenerateDir      string `name:"generate" placeholder:"PATH" help:"Generate key and config in specified dir, then exit"` //DEPRECATED: replaced by subcommand!
+	GenerateDir      string `name:"generate" placeholder:"PATH" help:"Generate key and config in specified dir, then exit"` // DEPRECATED: replaced by subcommand!
 	GUIAddress       string `name:"gui-address" placeholder:"URL" help:"Override GUI address (e.g. \"http://192.0.2.42:8443\")"`
 	GUIAPIKey        string `name:"gui-apikey" placeholder:"API-KEY" help:"Override GUI API key"`
 	LogFile          string `name:"logfile" default:"${logFile}" placeholder:"PATH" help:"Log file name (see below)"`
@@ -169,11 +170,10 @@ type serveOptions struct {
 	// Debug options below
 	DebugDBIndirectGCInterval time.Duration `env:"STGCINDIRECTEVERY" help:"Database indirection GC interval"`
 	DebugDBRecheckInterval    time.Duration `env:"STRECHECKDBEVERY" help:"Database metadata recalculation interval"`
-	DebugDeadlockTimeout      int           `placeholder:"SECONDS" env:"STDEADLOCKTIMEOUT" help:"Used for debugging internal deadlocks"`
 	DebugGUIAssetsDir         string        `placeholder:"PATH" help:"Directory to load GUI assets from" env:"STGUIASSETS"`
 	DebugPerfStats            bool          `env:"STPERFSTATS" help:"Write running performance statistics to perf-$pid.csv (Unix only)"`
 	DebugProfileBlock         bool          `env:"STBLOCKPROFILE" help:"Write block profiles to block-$pid-$timestamp.pprof every 20 seconds"`
-	DebugProfileCPU           bool          `help:"Write a CPU profile to cpu-$pid.pprof on exit" env:"CPUPROFILE"`
+	DebugProfileCPU           bool          `help:"Write a CPU profile to cpu-$pid.pprof on exit" env:"STCPUPROFILE"`
 	DebugProfileHeap          bool          `env:"STHEAPPROFILE" help:"Write heap profiles to heap-$pid-$timestamp.pprof each time heap usage increases"`
 	DebugProfilerListen       string        `placeholder:"ADDR" env:"STPROFILER" help:"Network profiler listen address"`
 	DebugResetDatabase        bool          `name:"reset-database" help:"Reset the database, forcing a full rescan and resync"`
@@ -187,7 +187,7 @@ type serveOptions struct {
 func defaultVars() kong.Vars {
 	vars := kong.Vars{}
 
-	vars["logFlags"] = strconv.Itoa(log.Ltime)
+	vars["logFlags"] = strconv.Itoa(logger.DefaultFlags)
 	vars["logMaxSize"] = strconv.Itoa(10 << 20) // 10 MiB
 	vars["logMaxFiles"] = "3"                   // plus the current one
 
@@ -199,7 +199,7 @@ func defaultVars() kong.Vars {
 	// Windows, the "default" options.logFile will later be replaced with the
 	// default path, unless the user has manually specified "-" or
 	// something else.
-	if runtime.GOOS == "windows" {
+	if build.IsWindows {
 		vars["logFile"] = "default"
 	} else {
 		vars["logFile"] = "-"
@@ -209,17 +209,6 @@ func defaultVars() kong.Vars {
 }
 
 func main() {
-	// The "cli" subcommand uses a different command line parser, and e.g. help
-	// gets mangled when integrating it as a subcommand -> detect it here at the
-	// beginning.
-	if len(os.Args) > 1 && os.Args[1] == "cli" {
-		if err := cli.Run(); err != nil {
-			fmt.Println(err)
-			os.Exit(1)
-		}
-		return
-	}
-
 	// First some massaging of the raw command line to fit the new model.
 	// Basically this means adding the default command at the front, and
 	// converting -options to --options.
@@ -245,13 +234,22 @@ func main() {
 
 	// Create a parser with an overridden help function to print our extra
 	// help info.
-	parser, err := kong.New(&entrypoint, kong.Help(helpHandler), defaultVars())
+	parser, err := kong.New(
+		&entrypoint,
+		kong.ConfigureHelp(kong.HelpOptions{
+			NoExpandSubcommands: true,
+			Compact:             true,
+		}),
+		kong.Help(helpHandler),
+		defaultVars(),
+	)
 	if err != nil {
 		log.Fatal(err)
 	}
 
 	ctx, err := parser.Parse(args)
 	parser.FatalIfErrorf(err)
+	ctx.BindTo(l, (*logger.Logger)(nil)) // main logger available to subcommands
 	err = ctx.Run()
 	parser.FatalIfErrorf(err)
 }
@@ -292,16 +290,25 @@ func (options serveOptions) Run() error {
 		os.Exit(svcutil.ExitError.AsInt())
 	}
 
-	if options.LogFile == "default" || options.LogFile == "" {
+	// Treat an explicitly empty log file name as no log file
+	if options.LogFile == "" {
+		options.LogFile = "-"
+	}
+	if options.LogFile != "default" {
 		// We must set this *after* expandLocations above.
-		// Handling an empty value is for backwards compatibility (<1.4.1).
-		options.LogFile = locations.Get(locations.LogFile)
+		if err := locations.Set(locations.LogFile, options.LogFile); err != nil {
+			l.Warnln("Setting log file path:", err)
+			os.Exit(svcutil.ExitError.AsInt())
+		}
 	}
 
-	if options.DebugGUIAssetsDir == "" {
+	if options.DebugGUIAssetsDir != "" {
 		// The asset dir is blank if STGUIASSETS wasn't set, in which case we
 		// should look for extra assets in the default place.
-		options.DebugGUIAssetsDir = locations.Get(locations.GUIAssets)
+		if err := locations.Set(locations.GUIAssets, options.DebugGUIAssetsDir); err != nil {
+			l.Warnln("Setting GUI assets path:", err)
+			os.Exit(svcutil.ExitError.AsInt())
+		}
 	}
 
 	if options.Version {
@@ -310,7 +317,7 @@ func (options serveOptions) Run() error {
 	}
 
 	if options.Paths {
-		showPaths(options)
+		fmt.Print(locations.PrettyPaths())
 		return nil
 	}
 
@@ -329,7 +336,7 @@ func (options serveOptions) Run() error {
 	}
 
 	if options.BrowserOnly {
-		if err := openGUI(protocol.EmptyDeviceID); err != nil {
+		if err := openGUI(); err != nil {
 			l.Warnln("Failed to open web UI:", err)
 			os.Exit(svcutil.ExitError.AsInt())
 		}
@@ -337,7 +344,7 @@ func (options serveOptions) Run() error {
 	}
 
 	if options.GenerateDir != "" {
-		if err := generate.Generate(options.GenerateDir, "", "", options.NoDefaultFolder); err != nil {
+		if err := generate.Generate(l, options.GenerateDir, "", "", options.NoDefaultFolder, options.SkipPortProbing); err != nil {
 			l.Warnln("Failed to generate config and keys:", err)
 			os.Exit(svcutil.ExitError.AsInt())
 		}
@@ -345,7 +352,7 @@ func (options serveOptions) Run() error {
 	}
 
 	// Ensure that our home directory exists.
-	if err := syncthing.EnsureDir(locations.GetBaseDir(locations.ConfigBaseDir), 0700); err != nil {
+	if err := syncthing.EnsureDir(locations.GetBaseDir(locations.ConfigBaseDir), 0o700); err != nil {
 		l.Warnln("Failure on home directory:", err)
 		os.Exit(svcutil.ExitError.AsInt())
 	}
@@ -406,8 +413,8 @@ func (options serveOptions) Run() error {
 	return nil
 }
 
-func openGUI(myID protocol.DeviceID) error {
-	cfg, err := loadOrDefaultConfig(myID, events.NoopLogger)
+func openGUI() error {
+	cfg, err := loadOrDefaultConfig()
 	if err != nil {
 		return err
 	}
@@ -452,7 +459,7 @@ func (e *errNoUpgrade) Error() string {
 }
 
 func checkUpgrade() (upgrade.Release, error) {
-	cfg, err := loadOrDefaultConfig(protocol.EmptyDeviceID, events.NoopLogger)
+	cfg, err := loadOrDefaultConfig()
 	if err != nil {
 		return upgrade.Release{}, err
 	}
@@ -471,7 +478,7 @@ func checkUpgrade() (upgrade.Release, error) {
 }
 
 func upgradeViaRest() error {
-	cfg, err := loadOrDefaultConfig(protocol.EmptyDeviceID, events.NoopLogger)
+	cfg, err := loadOrDefaultConfig()
 	if err != nil {
 		return err
 	}
@@ -551,7 +558,7 @@ func syncthingMain(options serveOptions) {
 	evLogger := events.NewLogger()
 	earlyService.Add(evLogger)
 
-	cfgWrapper, err := syncthing.LoadConfigAtStartup(locations.Get(locations.ConfigFile), cert, evLogger, options.AllowNewerConfig, options.NoDefaultFolder)
+	cfgWrapper, err := syncthing.LoadConfigAtStartup(locations.Get(locations.ConfigFile), cert, evLogger, options.AllowNewerConfig, options.NoDefaultFolder, options.SkipPortProbing)
 	if err != nil {
 		l.Warnln("Failed to initialize config:", err)
 		os.Exit(svcutil.ExitError.AsInt())
@@ -583,7 +590,7 @@ func syncthingMain(options serveOptions) {
 	}
 
 	// Check if auto-upgrades is possible, and if yes, and it's enabled do an initial
-	// upgrade immedately. The auto-upgrade routine can only be started
+	// upgrade immediately. The auto-upgrade routine can only be started
 	// later after App is initialised.
 
 	autoUpgradePossible := autoUpgradePossible(options)
@@ -612,8 +619,6 @@ func syncthingMain(options serveOptions) {
 	}
 
 	appOpts := syncthing.Options{
-		AssetDir:             options.DebugGUIAssetsDir,
-		DeadlockTimeoutS:     options.DebugDeadlockTimeout,
 		NoUpgrade:            options.NoUpgrade,
 		ProfilerAddr:         options.DebugProfilerListen,
 		ResetDeltaIdxs:       options.DebugResetDeltaIdxs,
@@ -624,10 +629,6 @@ func syncthingMain(options serveOptions) {
 	if options.Audit {
 		appOpts.AuditWriter = auditWriter(options.AuditFile)
 	}
-	if t := os.Getenv("STDEADLOCKTIMEOUT"); t != "" {
-		secs, _ := strconv.Atoi(t)
-		appOpts.DeadlockTimeoutS = secs
-	}
 	if dur, err := time.ParseDuration(os.Getenv("STRECHECKDBEVERY")); err == nil {
 		appOpts.DBRecheckInterval = dur
 	}
@@ -647,7 +648,7 @@ func syncthingMain(options serveOptions) {
 
 	setupSignalHandling(app)
 
-	if len(os.Getenv("GOMAXPROCS")) == 0 {
+	if os.Getenv("GOMAXPROCS") == "" {
 		runtime.GOMAXPROCS(runtime.NumCPU())
 	}
 
@@ -663,8 +664,6 @@ func syncthingMain(options serveOptions) {
 		}
 	}
 
-	go standbyMonitor(app, cfgWrapper)
-
 	if err := app.Start(); err != nil {
 		os.Exit(svcutil.ExitError.AsInt())
 	}
@@ -711,12 +710,14 @@ func setupSignalHandling(app *syncthing.App) {
 	}()
 }
 
-func loadOrDefaultConfig(myID protocol.DeviceID, evLogger events.Logger) (config.Wrapper, error) {
+// loadOrDefaultConfig creates a temporary, minimal configuration wrapper if no file
+// exists.  As it disregards some command-line options, that should never be persisted.
+func loadOrDefaultConfig() (config.Wrapper, error) {
 	cfgFile := locations.Get(locations.ConfigFile)
-	cfg, _, err := config.Load(cfgFile, myID, evLogger)
-
+	cfg, _, err := config.Load(cfgFile, protocol.EmptyDeviceID, events.NoopLogger)
 	if err != nil {
-		cfg, err = syncthing.DefaultConfig(cfgFile, myID, evLogger, true)
+		newCfg := config.New(protocol.EmptyDeviceID)
+		return config.Wrap(cfgFile, newCfg, protocol.EmptyDeviceID, events.NoopLogger), nil
 	}
 
 	return cfg, err
@@ -741,7 +742,7 @@ func auditWriter(auditFile string) io.Writer {
 		} else {
 			auditFlags = os.O_WRONLY | os.O_CREATE | os.O_APPEND
 		}
-		fd, err = os.OpenFile(auditFile, auditFlags, 0600)
+		fd, err = os.OpenFile(auditFile, auditFlags, 0o600)
 		if err != nil {
 			l.Warnln("Audit:", err)
 			os.Exit(svcutil.ExitError.AsInt())
@@ -758,26 +759,6 @@ func resetDB() error {
 	return os.RemoveAll(locations.Get(locations.Database))
 }
 
-func standbyMonitor(app *syncthing.App, cfg config.Wrapper) {
-	restartDelay := 60 * time.Second
-	now := time.Now()
-	for {
-		time.Sleep(10 * time.Second)
-		if time.Since(now) > 2*time.Minute && cfg.Options().RestartOnWakeup {
-			l.Infof("Paused state detected, possibly woke up from standby. Restarting in %v.", restartDelay)
-
-			// We most likely just woke from standby. If we restart
-			// immediately chances are we won't have networking ready. Give
-			// things a moment to stabilize.
-			time.Sleep(restartDelay)
-
-			app.Stop(svcutil.ExitRestart)
-			return
-		}
-		now = time.Now()
-	}
-}
-
 func autoUpgradePossible(options serveOptions) bool {
 	if upgrade.DisabledByCompilation {
 		return false
@@ -909,16 +890,6 @@ func cleanConfigDirectory() {
 	}
 }
 
-func showPaths(options serveOptions) {
-	fmt.Printf("Configuration file:\n\t%s\n\n", locations.Get(locations.ConfigFile))
-	fmt.Printf("Database directory:\n\t%s\n\n", locations.Get(locations.Database))
-	fmt.Printf("Device private key & certificate files:\n\t%s\n\t%s\n\n", locations.Get(locations.KeyFile), locations.Get(locations.CertFile))
-	fmt.Printf("HTTPS private key & certificate files:\n\t%s\n\t%s\n\n", locations.Get(locations.HTTPSKeyFile), locations.Get(locations.HTTPSCertFile))
-	fmt.Printf("Log file:\n\t%s\n\n", options.LogFile)
-	fmt.Printf("GUI override directory:\n\t%s\n\n", options.DebugGUIAssetsDir)
-	fmt.Printf("Default sync folder directory:\n\t%s\n\n", locations.Get(locations.DefFolder))
-}
-
 func setPauseState(cfgWrapper config.Wrapper, paused bool) {
 	_, err := cfgWrapper.Modify(func(cfg *config.Configuration) {
 		for i := range cfg.Devices {

cmd/syncthing/monitor.go

@@ -15,16 +15,14 @@ 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"
 )
@@ -50,7 +48,7 @@ func monitorMain(options serveOptions) {
 
 	var dst io.Writer = os.Stdout
 
-	logFile := options.LogFile
+	logFile := locations.Get(locations.LogFile)
 	if logFile != "-" {
 		if expanded, err := fs.ExpandTilde(logFile); err == nil {
 			logFile = expanded
@@ -68,7 +66,7 @@ func monitorMain(options serveOptions) {
 		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,
@@ -85,6 +83,11 @@ func monitorMain(options serveOptions) {
 	}
 
 	args := os.Args
+	binary, err := getBinary(args[0])
+	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)
@@ -106,7 +109,7 @@ func monitorMain(options serveOptions) {
 		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()
@@ -182,7 +185,7 @@ func monitorMain(options serveOptions) {
 				// 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)
@@ -205,6 +208,19 @@ func monitorMain(options serveOptions) {
 	}
 }
 
+func getBinary(args0 string) (string, error) {
+	e, err := os.Executable()
+	if err == nil {
+		return e, nil
+	}
+	// Check if args0 cuts it
+	e, lerr := exec.LookPath(args0)
+	if lerr == nil {
+		return e, nil
+	}
+	return "", err
+}
+
 func copyStderr(stderr io.Reader, dst io.Writer) {
 	br := bufio.NewReader(stderr)
 
@@ -257,7 +273,7 @@ func copyStderr(stderr io.Reader, dst io.Writer) {
 * This crash usually occurs due to one of the following reasons:                *
 *  - Syncthing being stopped abruptly (killed/loss of power)                    *
 *  - Bad hardware (memory/disk issues)                                          *
-*  - Software that affects disk writes (SSD caching software and simillar)      *
+*  - Software that affects disk writes (SSD caching software and similar)       *
 *                                                                               *
 * Please see the following URL for instructions on how to recover:              *
 *   https://docs.syncthing.net/users/faq.html#my-syncthing-database-is-corrupt  *
@@ -311,40 +327,30 @@ 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) {
-		// The path to the binary doesn't contain a slash, so it should be
-		// found in $PATH.
-		binary, err := exec.LookPath(args[0])
-		if err != nil {
-			return err
-		}
-		args[0] = binary
-	}
-
-	return syscall.Exec(args[0], args, os.Environ())
+func restartMonitorUnix(binary string, args []string) error {
+	return syscall.Exec(binary, 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
@@ -515,7 +521,7 @@ func (f *autoclosedFile) ensureOpenLocked() error {
 	// We open the file for write only, and create it if it doesn't exist.
 	flags := os.O_WRONLY | os.O_CREATE | os.O_APPEND
 
-	fd, err := os.OpenFile(f.name, flags, 0644)
+	fd, err := os.OpenFile(f.name, flags, 0o644)
 	if err != nil {
 		return err
 	}
@@ -564,7 +570,7 @@ 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

cmd/syncthing/monitor_test.go

@@ -17,14 +17,17 @@ import (
 func TestRotatedFile(t *testing.T) {
 	// Verify that log rotation happens.
 
-	dir, err := os.MkdirTemp("", "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")

cmd/syncthing/openurl_unix.go

@@ -11,20 +11,18 @@ 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()
 }

cmd/ursrv/aggregate/aggregate.go

@@ -4,10 +4,11 @@
 // 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 aggregate
 
 import (
 	"database/sql"
+	"fmt"
 	"log"
 	"os"
 	"time"
@@ -15,26 +16,21 @@ import (
 	_ "github.com/lib/pq"
 )
 
-var dbConn = getEnvDefault("UR_DB_URL", "postgres://user:password@localhost/ur?sslmode=disable")
-
-func getEnvDefault(key, def string) string {
-	if val := os.Getenv(key); val != "" {
-		return val
-	}
-	return def
+type CLI struct {
+	DBConn string `env:"UR_DB_URL" default:"postgres://user:password@localhost/ur?sslmode=disable"`
 }
 
-func main() {
+func (cli *CLI) Run() error {
 	log.SetFlags(log.Ltime | log.Ldate)
 	log.SetOutput(os.Stdout)
 
-	db, err := sql.Open("postgres", dbConn)
+	db, err := sql.Open("postgres", cli.DBConn)
 	if err != nil {
-		log.Fatalln("database:", err)
+		return fmt.Errorf("database: %w", err)
 	}
 	err = setupDB(db)
 	if err != nil {
-		log.Fatalln("database:", err)
+		return fmt.Errorf("database: %w", err)
 	}
 
 	for {
@@ -53,13 +49,6 @@ func runAggregation(db *sql.DB) {
 	}
 	log.Println("Inserted", rows, "rows")
 
-	log.Println("Aggregating UserMovement data")
-	rows, err = aggregateUserMovement(db)
-	if err != nil {
-		log.Println("aggregate:", err)
-	}
-	log.Println("Inserted", rows, "rows")
-
 	since = maxIndexedDay(db, "Performance")
 	log.Println("Aggregating Performance data since", since)
 	rows, err = aggregatePerformance(db, since.Add(24*time.Hour))
@@ -94,16 +83,6 @@ func setupDB(db *sql.DB) error {
 		return err
 	}
 
-	_, err = db.Exec(`CREATE TABLE IF NOT EXISTS UserMovement (
-		Day TIMESTAMP NOT NULL,
-		Added INTEGER NOT NULL,
-		Bounced INTEGER NOT NULL,
-		Removed INTEGER NOT NULL
-	)`)
-	if err != nil {
-		return err
-	}
-
 	_, err = db.Exec(`CREATE TABLE IF NOT EXISTS Performance (
 		Day TIMESTAMP NOT NULL,
 		TotFiles INTEGER NOT NULL,
@@ -119,13 +98,13 @@ func setupDB(db *sql.DB) error {
 	_, err = db.Exec(`CREATE TABLE IF NOT EXISTS BlockStats (
 		Day TIMESTAMP NOT NULL,
 		Reports INTEGER NOT NULL,
-		Total INTEGER NOT NULL,
-		Renamed INTEGER NOT NULL,
-		Reused INTEGER NOT NULL,
-		Pulled INTEGER NOT NULL,
-		CopyOrigin INTEGER NOT NULL,
-		CopyOriginShifted INTEGER NOT NULL,
-		CopyElsewhere INTEGER NOT NULL
+		Total BIGINT NOT NULL,
+		Renamed BIGINT NOT NULL,
+		Reused BIGINT NOT NULL,
+		Pulled BIGINT NOT NULL,
+		CopyOrigin BIGINT NOT NULL,
+		CopyOriginShifted BIGINT NOT NULL,
+		CopyElsewhere BIGINT NOT NULL
 	)`)
 	if err != nil {
 		return err
@@ -143,11 +122,6 @@ func setupDB(db *sql.DB) error {
 		_, _ = db.Exec(`CREATE INDEX VersionDayIndex ON VersionSummary (Day)`)
 	}
 
-	row = db.QueryRow(`SELECT 'MovementDayIndex'::regclass`)
-	if err := row.Scan(&t); err != nil {
-		_, _ = db.Exec(`CREATE INDEX MovementDayIndex ON UserMovement (Day)`)
-	}
-
 	row = db.QueryRow(`SELECT 'PerformanceDayIndex'::regclass`)
 	if err := row.Scan(&t); err != nil {
 		_, _ = db.Exec(`CREATE INDEX PerformanceDayIndex ON Performance (Day)`)
@@ -192,87 +166,6 @@ func aggregateVersionSummary(db *sql.DB, since time.Time) (int64, error) {
 	return res.RowsAffected()
 }
 
-func aggregateUserMovement(db *sql.DB) (int64, error) {
-	rows, err := db.Query(`SELECT
-		DATE_TRUNC('day', Received) AS Day,
-		Report->>'uniqueID'
-		FROM ReportsJson
-		WHERE
-			Report->>'uniqueID' IS NOT NULL
-			AND Received < DATE_TRUNC('day', NOW())
-			AND Report->>'version' like 'v_.%'
-		ORDER BY Day
-	`)
-	if err != nil {
-		return 0, err
-	}
-	defer rows.Close()
-
-	firstSeen := make(map[string]time.Time)
-	lastSeen := make(map[string]time.Time)
-	var minTs time.Time
-	minTs = minTs.In(time.UTC)
-
-	for rows.Next() {
-		var ts time.Time
-		var id string
-		if err := rows.Scan(&ts, &id); err != nil {
-			return 0, err
-		}
-
-		if minTs.IsZero() {
-			minTs = ts
-		}
-		if _, ok := firstSeen[id]; !ok {
-			firstSeen[id] = ts
-		}
-		lastSeen[id] = ts
-	}
-
-	type sumRow struct {
-		day     time.Time
-		added   int
-		removed int
-		bounced int
-	}
-	var sumRows []sumRow
-	for t := minTs; t.Before(time.Now().Truncate(24 * time.Hour)); t = t.AddDate(0, 0, 1) {
-		var added, removed, bounced int
-		old := t.Before(time.Now().AddDate(0, 0, -30))
-		for id, first := range firstSeen {
-			last := lastSeen[id]
-			if first.Equal(t) && last.Equal(t) && old {
-				bounced++
-				continue
-			}
-			if first.Equal(t) {
-				added++
-			}
-			if last == t && old {
-				removed++
-			}
-		}
-		sumRows = append(sumRows, sumRow{t, added, removed, bounced})
-	}
-
-	tx, err := db.Begin()
-	if err != nil {
-		return 0, err
-	}
-	if _, err := tx.Exec("DELETE FROM UserMovement"); err != nil {
-		tx.Rollback()
-		return 0, err
-	}
-	for _, r := range sumRows {
-		if _, err := tx.Exec("INSERT INTO UserMovement (Day, Added, Removed, Bounced) VALUES ($1, $2, $3, $4)", r.day, r.added, r.removed, r.bounced); err != nil {
-			tx.Rollback()
-			return 0, err
-		}
-	}
-
-	return int64(len(sumRows)), tx.Commit()
-}
-
 func aggregatePerformance(db *sql.DB, since time.Time) (int64, error) {
 	res, err := db.Exec(`INSERT INTO Performance (
 	SELECT
@@ -306,13 +199,13 @@ func aggregateBlockStats(db *sql.DB, since time.Time) (int64, error) {
 	SELECT
 		DATE_TRUNC('day', Received) AS Day,
 		COUNT(1) As Reports,
-		SUM((Report->'blockStats'->>'total')::numeric) AS Total,
-		SUM((Report->'blockStats'->>'renamed')::numeric) AS Renamed,
-		SUM((Report->'blockStats'->>'reused')::numeric) AS Reused,
-		SUM((Report->'blockStats'->>'pulled')::numeric) AS Pulled,
-		SUM((Report->'blockStats'->>'copyOrigin')::numeric) AS CopyOrigin,
-		SUM((Report->'blockStats'->>'copyOriginShifted')::numeric) AS CopyOriginShifted,
-		SUM((Report->'blockStats'->>'copyElsewhere')::numeric) AS CopyElsewhere
+		SUM((Report->'blockStats'->>'total')::numeric)::bigint AS Total,
+		SUM((Report->'blockStats'->>'renamed')::numeric)::bigint AS Renamed,
+		SUM((Report->'blockStats'->>'reused')::numeric)::bigint AS Reused,
+		SUM((Report->'blockStats'->>'pulled')::numeric)::bigint AS Pulled,
+		SUM((Report->'blockStats'->>'copyOrigin')::numeric)::bigint AS CopyOrigin,
+		SUM((Report->'blockStats'->>'copyOriginShifted')::numeric)::bigint AS CopyOriginShifted,
+		SUM((Report->'blockStats'->>'copyElsewhere')::numeric)::bigint AS CopyElsewhere
 		FROM ReportsJson
 		WHERE
 			Received > $1

cmd/ursrv/migration.go

@@ -1,143 +0,0 @@
-// Copyright (C) 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 (
-	"database/sql"
-	"database/sql/driver"
-	"encoding/json"
-	"errors"
-	"log"
-	"strings"
-
-	"github.com/lib/pq"
-
-	"github.com/syncthing/syncthing/lib/ur/contract"
-)
-
-func migrate(db *sql.DB) error {
-	var count uint64
-	log.Println("Checking old table row count, this might take a while...")
-	if err := db.QueryRow(`SELECT COUNT(1) FROM Reports`).Scan(&count); err != nil || count == 0 {
-		// err != nil most likely means table does not exist.
-		return nil
-	}
-	log.Printf("Found %d records, will perform migration.", count)
-
-	tx, err := db.Begin()
-	if err != nil {
-		log.Println("sql:", err)
-		return err
-	}
-	defer tx.Rollback()
-
-	// These must be lower case, because we don't quote them when creating, so postgres creates them lower case.
-	// Yet pg.CopyIn quotes them, which makes them case sensitive.
-	stmt, err := tx.Prepare(pq.CopyIn("reportsjson", "received", "report"))
-	if err != nil {
-		log.Println("sql:", err)
-		return err
-	}
-
-	// Custom types used in the old struct.
-	var rep contract.Report
-	var rescanIntvs pq.Int64Array
-	var fsWatcherDelay pq.Int64Array
-	pullOrder := make(IntMap)
-	fileSystemType := make(IntMap)
-	themes := make(IntMap)
-	transportStats := make(IntMap)
-
-	rows, err := db.Query(`SELECT ` + strings.Join(rep.FieldNames(), ", ") + `, FolderFsWatcherDelays, RescanIntvs, FolderPullOrder, FolderFilesystemType, GUITheme, Transport FROM Reports`)
-	if err != nil {
-		log.Println("sql:", err)
-		return err
-	}
-	defer rows.Close()
-
-	var done uint64
-	pct := count / 100
-
-	for rows.Next() {
-		err := rows.Scan(append(rep.FieldPointers(), &fsWatcherDelay, &rescanIntvs, &pullOrder, &fileSystemType, &themes, &transportStats)...)
-		if err != nil {
-			log.Println("sql scan:", err)
-			return err
-		}
-		// Patch up parts that used to use custom types
-		rep.RescanIntvs = make([]int, len(rescanIntvs))
-		for i := range rescanIntvs {
-			rep.RescanIntvs[i] = int(rescanIntvs[i])
-		}
-		rep.FolderUsesV3.FsWatcherDelays = make([]int, len(fsWatcherDelay))
-		for i := range fsWatcherDelay {
-			rep.FolderUsesV3.FsWatcherDelays[i] = int(fsWatcherDelay[i])
-		}
-		rep.FolderUsesV3.PullOrder = pullOrder
-		rep.FolderUsesV3.FilesystemType = fileSystemType
-		rep.GUIStats.Theme = themes
-		rep.TransportStats = transportStats
-
-		_, err = stmt.Exec(rep.Received, rep)
-		if err != nil {
-			log.Println("sql insert:", err)
-			return err
-		}
-		done++
-		if done%pct == 0 {
-			log.Printf("Migration progress %d/%d (%d%%)", done, count, (100*done)/count)
-		}
-	}
-
-	// Tell the driver bulk copy is finished
-	_, err = stmt.Exec()
-	if err != nil {
-		log.Println("sql stmt exec:", err)
-		return err
-	}
-
-	err = stmt.Close()
-	if err != nil {
-		log.Println("sql stmt close:", err)
-		return err
-	}
-
-	_, err = tx.Exec("DROP TABLE Reports")
-	if err != nil {
-		log.Println("sql drop:", err)
-		return err
-	}
-
-	err = tx.Commit()
-	if err != nil {
-		log.Println("sql commit:", err)
-		return err
-	}
-	return nil
-}
-
-type IntMap map[string]int
-
-func (p IntMap) Value() (driver.Value, error) {
-	return json.Marshal(p)
-}
-
-func (p *IntMap) Scan(src interface{}) error {
-	source, ok := src.([]byte)
-	if !ok {
-		return errors.New("Type assertion .([]byte) failed.")
-	}
-
-	var i map[string]int
-	err := json.Unmarshal(source, &i)
-	if err != nil {
-		return err
-	}
-
-	*p = i
-	return nil
-}

cmd/ursrv/serve/analytics.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 serve
 
 import (
 	"regexp"
@@ -145,7 +145,7 @@ func statsForFloats(data []float64) [4]float64 {
 	return res
 }
 
-func group(by func(string) string, as []analytic, perGroup int) []analytic {
+func group(by func(string) string, as []analytic, perGroup int, otherPct float64) []analytic {
 	var res []analytic
 
 next:
@@ -170,6 +170,25 @@ next:
 	}
 
 	sort.Sort(analyticList(res))
+
+	if otherPct > 0 {
+		// Groups with less than otherPCt go into "Other"
+		other := analytic{
+			Key: "Other",
+		}
+		for i := 0; i < len(res); i++ {
+			if res[i].Percentage < otherPct || res[i].Key == "Other" {
+				other.Count += res[i].Count
+				other.Percentage += res[i].Percentage
+				res = append(res[:i], res[i+1:]...)
+				i--
+			}
+		}
+		if other.Count > 0 {
+			res = append(res, other)
+		}
+	}
+
 	return res
 }
 

cmd/ursrv/serve/compiler_test.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 serve
 
 import "testing"
 

cmd/ursrv/serve/formatting.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 serve
 
 import (
 	"bytes"

cmd/ursrv/serve/metrics.go

@@ -0,0 +1,26 @@
+// Copyright (C) 2023 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 serve
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+)
+
+var metricReportsTotal = promauto.NewCounterVec(prometheus.CounterOpts{
+	Namespace: "syncthing",
+	Subsystem: "ursrv",
+	Name:      "reports_total",
+}, []string{"version"})
+
+func init() {
+	metricReportsTotal.WithLabelValues("fail")
+	metricReportsTotal.WithLabelValues("duplicate")
+	metricReportsTotal.WithLabelValues("v1")
+	metricReportsTotal.WithLabelValues("v2")
+	metricReportsTotal.WithLabelValues("v3")
+}

cmd/ursrv/serve/static/index.html

@@ -50,7 +50,6 @@ found in the LICENSE file.
 
   <script type="text/javascript">
     google.setOnLoadCallback(drawVersionChart);
-    google.setOnLoadCallback(drawMovementChart);
     google.setOnLoadCallback(drawBlockStatsChart);
     google.setOnLoadCallback(drawPerformanceCharts);
 
@@ -82,37 +81,6 @@ found in the LICENSE file.
       chart.draw(data, options);
     }
 
-    function drawMovementChart() {
-      var jsonData = $.ajax({url: "movement.json", dataType:"json", async: false}).responseText;
-      var rows = JSON.parse(jsonData);
-
-      var data = new google.visualization.DataTable();
-      data.addColumn('date', 'Day');
-      for (var i = 1; i < rows[0].length; i++){
-        data.addColumn('number', rows[0][i]);
-      }
-
-      for (var i = 1; i < rows.length; i++){
-        rows[i][0] = new Date(rows[i][0]);
-        if (rows[i][1] > 500) {
-          rows[i][1] = null;
-        }
-        if (rows[i][2] < -500) {
-          rows[i][2] = null;
-        }
-        data.addRow(rows[i]);
-      };
-
-      var options = {
-        legend: { position: 'bottom', alignment: 'center' },
-        colors: ['rgb(102,194,165)','rgb(252,141,98)','rgb(141,160,203)','rgb(231,138,195)','rgb(166,216,84)','rgb(255,217,47)'],
-        chartArea: {left: 80, top: 20, width: '1020', height: '300'},
-      };
-
-      var chart = new google.visualization.AreaChart(document.getElementById('movementChart'));
-      chart.draw(data, options);
-    }
-
     function formatGibibytes(gibibytes, decimals) {
       if(gibibytes == 0) return '0 GiB';
       var k = 1024,
@@ -229,7 +197,7 @@ found in the LICENSE file.
       };
 
       var baseLayer = L.tileLayer(
-        'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',{
+        'https://tile.openstreetmap.org/{z}/{x}/{y}.png',{
           attribution: '...',
           maxZoom: 18
         }
@@ -273,14 +241,6 @@ found in the LICENSE file.
         </p>
         <div class="img-thumbnail" id="versionChart" style="width: 1130px; height: 400px; padding: 10px;"></div>
 
-        <h4 id="joining-leaving">Users Joining and Leaving per Day</h4>
-        <p>
-          This is the total number of unique users joining and leaving per day. A user is counted as "joined" on first the day their unique ID is seen, and as "left" on the last day the unique ID was seen before a two weeks or longer absence. "Bounced" refers to users who joined and left on the same day.
-        </p>
-        <div class="img-thumbnail" id="movementChart" style="width: 1130px; height: 400px; padding: 10px;"></div>
-        <p class="text-muted">
-         Reappearance of users cause the "left" data to shrink retroactively.
-        </p>
         <div id="block-stats">
           <h4>Data Transfers per Day</h4>
           <p>
@@ -315,7 +275,7 @@ found in the LICENSE file.
                 <div class="col-md-6">
                   <table class="table table-striped">
                     <tbody>
-                      {{range .contries | slice 2 1}}
+                      {{range .countries | slice 2 1}}
                       <tr>
                         <td style="width: 45%">{{.Key}}</td>
                         <td style="width: 5%" class="text-right">{{if ge .Pct 10.0}}{{.Pct | printf "%.0f"}}{{else if ge .Pct 1.0}}{{.Pct | printf "%.01f"}}{{else}}{{.Pct | printf "%.02f"}}{{end}}%</td>
@@ -331,7 +291,7 @@ found in the LICENSE file.
                 <div class="col-md-6">
                   <table class="table table-striped">
                     <tbody>
-                      {{range .contries | slice 2 2}}
+                      {{range .countries | slice 2 2}}
                       <tr>
                         <td style="width: 45%">{{.Key}}</td>
                         <td style="width: 5%" class="text-right">{{if ge .Pct 10.0}}{{.Pct | printf "%.0f"}}{{else if ge .Pct 1.0}}{{.Pct | printf "%.01f"}}{{else}}{{.Pct | printf "%.02f"}}{{end}}%</td>
@@ -494,13 +454,13 @@ found in the LICENSE file.
         <table class="table table-striped">
           <thead>
             <tr>
-              <th>Builder</th>
+              <th>Distribution Channel</th>
               <th class="text-right">Devices</th>
               <th class="text-right">Share</th>
             </tr>
           </thead>
           <tbody>
-            {{range .builders}}
+            {{range .distributions}}
             <tr>
               <td>{{.Key}}</td>
               <td class="text-right">{{.Count}}</td>
@@ -515,13 +475,13 @@ found in the LICENSE file.
         <table class="table table-striped">
           <thead>
             <tr>
-              <th>Distribution Channel</th>
+              <th>Builder</th>
               <th class="text-right">Devices</th>
               <th class="text-right">Share</th>
             </tr>
           </thead>
           <tbody>
-            {{range .distributions}}
+            {{range .builders}}
             <tr>
               <td>{{.Key}}</td>
               <td class="text-right">{{.Count}}</td>
@@ -651,6 +611,7 @@ found in the LICENSE file.
   </div>
   <hr>
   <p>
+    <a href="https://github.com/syncthing/syncthing/tree/main/cmd/ursrv">Source code</a>.
     This product includes GeoLite2 data created by MaxMind, available from
     <a href="http://www.maxmind.com">http://www.maxmind.com</a>.
   </p>

etc/freebsd-rc/README.md

@@ -13,4 +13,4 @@ syncthing_log_file=</path/to/syncthing/log/file>
 syncthing_user=<syncthing_user>
 syncthing_group=<syncthing_group>
 ```
-See the rc.d script for more informations.
+See the rc.d script for more information.

etc/linux-desktop/syncthing-ui.desktop

@@ -2,7 +2,7 @@
 Name=Syncthing Web UI
 GenericName=File synchronization UI
 Comment=Opens Syncthing's Web UI in the default browser (Syncthing must already be started).
-Exec=/usr/bin/syncthing -browser-only
+Exec=/usr/bin/syncthing --browser-only
 Icon=syncthing
 Terminal=false
 Type=Application

etc/linux-sysctl/30-syncthing.conf

@@ -1,3 +1,4 @@
-# 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
+# Increase maximum socket buffer sizes to 2.5MiB for QUIC connections
+# see https://github.com/quic-go/quic-go/wiki/UDP-Buffer-Sizes
+net.core.rmem_max = 2621440
+net.core.wmem_max = 2621440

etc/linux-systemd/README.md

@@ -5,4 +5,4 @@ This directory contains configuration files for running Syncthing under the
 systemd user service. For further documentation take a look at the [systemd
 section][1] on https://docs.syncthing.net.
 
-[1]: https://docs.syncthing.net/users/autostart.html#using-systemd
+[1]: https://docs.syncthing.net/users/autostart#using-systemd

etc/linux-systemd/system/syncthing@.service

@@ -20,5 +20,9 @@ SystemCallArchitectures=native
 MemoryDenyWriteExecute=true
 NoNewPrivileges=true
 
+# Elevated permissions to sync ownership (disabled by default),
+# see https://docs.syncthing.net/advanced/folder-sync-ownership
+#AmbientCapabilities=CAP_CHOWN CAP_FOWNER
+
 [Install]
 WantedBy=multi-user.target

etc/linux-systemd/user/syncthing.service

@@ -16,5 +16,9 @@ SystemCallArchitectures=native
 MemoryDenyWriteExecute=true
 NoNewPrivileges=true
 
+# Elevated permissions to sync ownership (disabled by default),
+# see https://docs.syncthing.net/advanced/folder-sync-ownership
+#AmbientCapabilities=CAP_CHOWN CAP_FOWNER
+
 [Install]
 WantedBy=default.target

go.mod

@@ -1,61 +1,79 @@
 module github.com/syncthing/syncthing
 
+go 1.20
+
 require (
-	github.com/AudriusButkevicius/pfilter v0.0.10
-	github.com/AudriusButkevicius/recli v0.0.6
-	github.com/alecthomas/kong v0.2.17
-	github.com/bkaradzic/go-lz4 v0.0.0-20160924222819-7224d8d8f27e
+	github.com/AudriusButkevicius/recli v0.0.7-0.20220911121932-d000ce8fbf0f
+	github.com/alecthomas/kong v0.8.1
+	github.com/calmh/incontainer v0.0.0-20221224152218-b3e71b103d7a
 	github.com/calmh/xdr v1.1.0
-	github.com/ccding/go-stun v0.1.3
+	github.com/ccding/go-stun v0.1.4
 	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/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/chmduquesne/rollinghash v4.0.0+incompatible
+	github.com/cpuguy83/go-md2man/v2 v2.0.3 // indirect
 	github.com/d4l3k/messagediff v1.2.1
 	github.com/flynn-archive/go-shlex v0.0.0-20150515145356-3f9db97f8568
-	github.com/fsnotify/fsnotify v1.5.1 // indirect
 	github.com/getsentry/raven-go v0.2.0
-	github.com/go-asn1-ber/asn1-ber v1.5.3 // indirect
-	github.com/go-ldap/ldap/v3 v3.4.1
-	github.com/go-ole/go-ole v1.2.6-0.20210915003542-8b1f7f90f6b1 // indirect
+	github.com/go-asn1-ber/asn1-ber v1.5.5 // indirect
+	github.com/go-ldap/ldap/v3 v3.4.6
 	github.com/gobwas/glob v0.2.3
 	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/greatroar/blobloom v0.7.2
+	github.com/hashicorp/golang-lru/v2 v2.0.7
+	github.com/jackpal/gateway v1.0.10
 	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/klauspost/cpuid/v2 v2.0.9 // indirect
-	github.com/lib/pq v1.10.3
-	github.com/lucas-clemente/quic-go v0.24.0
-	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/klauspost/cpuid/v2 v2.2.6 // indirect
+	github.com/lib/pq v1.10.9
+	github.com/maruel/panicparse/v2 v2.3.1
+	github.com/maxbrunsfeld/counterfeiter/v6 v6.5.0
+	github.com/minio/sha256-simd v1.0.1
 	github.com/miscreant/miscreant.go v0.0.0-20200214223636-26d376326b75
-	github.com/oschwald/geoip2-golang v1.5.0
-	github.com/pkg/errors v0.9.1
-	github.com/prometheus/client_golang v1.11.0
-	github.com/prometheus/common v0.30.0 // indirect
-	github.com/prometheus/procfs v0.7.3 // indirect
+	github.com/oschwald/geoip2-golang v1.9.0
+	github.com/pierrec/lz4/v4 v4.1.18
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/prometheus/client_golang v1.17.0
+	github.com/prometheus/common v0.45.0 // indirect
+	github.com/prometheus/procfs v0.12.0 // indirect
+	github.com/quic-go/quic-go v0.40.1
 	github.com/rcrowley/go-metrics v0.0.0-20201227073835-cf1acfcdf475
-	github.com/sasha-s/go-deadlock v0.3.1
-	github.com/shirou/gopsutil/v3 v3.21.8
+	github.com/shirou/gopsutil/v3 v3.23.11
 	github.com/syncthing/notify v0.0.0-20210616190510-c6b7342338d2
-	github.com/syndtr/goleveldb v1.0.1-0.20200815071216-d9e9293bd0f7
-	github.com/thejerf/suture/v4 v4.0.1
-	github.com/urfave/cli v1.22.5
+	github.com/syndtr/goleveldb v1.0.1-0.20220721030215-126854af5e6d
+	github.com/thejerf/suture/v4 v4.0.2
+	github.com/urfave/cli v1.22.14
 	github.com/vitrun/qart v0.0.0-20160531060029-bf64b92db6b0
-	golang.org/x/crypto v0.0.0-20210921155107-089bfa567519
-	golang.org/x/mod v0.5.1 // indirect
-	golang.org/x/net v0.0.0-20210924151903-3ad01bbaa167
-	golang.org/x/sys v0.0.0-20210925032602-92d5a993a665
-	golang.org/x/text v0.3.7
-	golang.org/x/time v0.0.0-20210723032227-1f47c861a9ac
-	golang.org/x/tools v0.1.6
-	google.golang.org/protobuf v1.27.1
+	golang.org/x/crypto v0.16.0
+	golang.org/x/exp v0.0.0-20231206192017-f3f8817b8deb
+	golang.org/x/mod v0.14.0 // indirect
+	golang.org/x/net v0.19.0
+	golang.org/x/sys v0.15.0
+	golang.org/x/text v0.14.0
+	golang.org/x/time v0.5.0
+	golang.org/x/tools v0.16.1
+	google.golang.org/protobuf v1.31.0
 )
 
-go 1.16
+require (
+	github.com/Azure/go-ntlmssp v0.0.0-20221128193559-754e69321358 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/go-ole/go-ole v1.3.0 // indirect
+	github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 // indirect
+	github.com/google/pprof v0.0.0-20231212022811-ec68065c825e // indirect
+	github.com/google/uuid v1.4.0 // indirect
+	github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0 // indirect
+	github.com/onsi/ginkgo/v2 v2.13.2 // indirect
+	github.com/oschwald/maxminddb-golang v1.12.0 // indirect
+	github.com/power-devops/perfstat v0.0.0-20221212215047-62379fc7944b // indirect
+	github.com/prometheus/client_model v0.5.0 // indirect
+	github.com/quic-go/qtls-go1-20 v0.4.1 // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/yusufpapurcu/wmi v1.2.3 // indirect
+	go.uber.org/mock v0.3.0 // 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

go.sum

@@ -1,776 +1,320 @@
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-google.golang.org/genproto v0.0.0-20200430143042-b979b6f78d84/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
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-google.golang.org/genproto v0.0.0-20200729003335-053ba62fc06f/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
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-google.golang.org/genproto v0.0.0-20200825200019-8632dd797987/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/grpc v1.14.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
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 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
 google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
 google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
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 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
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 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
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gui/black/assets/css/theme.css

@@ -265,6 +265,16 @@ code.ng-binding{
     color: #222;
 }
 
-.fancytree-title {
-    color: #aaa !important;
+/*
+ * Fancytree tweaks
+ */
+
+.fancytree-container tr:hover,
+.fancytree-focused {
+    background-color: #222;
+}
+
+/* Remote Devices 'connection type'-icon color set to #aaa */
+.reception {
+    filter: invert(77%) sepia(0%) saturate(724%) hue-rotate(146deg) brightness(91%) contrast(85%);
 }

gui/dark/assets/css/theme.css

@@ -277,6 +277,16 @@ code.ng-binding{
     color: #3fa9f0;
 }
 
-.fancytree-title {
-    color: #aaa !important;
+/*
+ * Fancytree tweaks
+ */
+
+.fancytree-container tr:hover,
+.fancytree-focused {
+    background-color: #424242;
 }
+
+/* Remote Devices 'connection type'-icon color set to #aaa */
+.reception {
+    filter: invert(77%) sepia(0%) saturate(724%) hue-rotate(146deg) brightness(91%) contrast(85%);
+}

gui/default/assets/css/overrides.css

@@ -8,8 +8,8 @@
 */
 
 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 {
@@ -143,8 +143,49 @@ table.table-auto td {
     max-width: 0px;
 }
 
+/* Tag name is needed for selector to be specific enough to override Bootstrap style */
+input[type="checkbox"].extended-attributes-filter-rule-checkbox {
+    margin-top: 13px;
+}
+
+/* Remote Devices connection-quality indicator */
+.reception-0 {
+    background: url('../../vendor/bootstrap/fonts/reception-0.svg') no-repeat;
+}
+
+.reception-1 {
+    background: url('../../vendor/bootstrap/fonts/reception-1.svg') no-repeat;
+}
+
+.reception-2 {
+    background: url('../../vendor/bootstrap/fonts/reception-2.svg') no-repeat;
+}
+
+.reception-3 {
+    background: url('../../vendor/bootstrap/fonts/reception-3.svg') no-repeat;
+}
+
+.reception-4 {
+    background: url('../../vendor/bootstrap/fonts/reception-4.svg') no-repeat;
+}
+
+.reception {
+    width: 1em;
+    height: 1em;
+    display: inline-block;
+    vertical-align: -10%;
+    background-size: contain;
+    /* Simulate same width as Fork Awesome icons. */
+    margin-left: .14285715em;
+    margin-right: .14285715em;
+}
+
+.inline-icon {
+    display: inline-block;
+}
+
 /* Wrap long file paths to prevent text overflow. See issue #6268. */
-.file-path {
+.word-break-all {
     word-break: break-all;
 }
 
@@ -166,16 +207,13 @@ 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;
 }
@@ -304,23 +342,60 @@ ul.three-columns li, ul.two-columns li {
     z-index: 980;
 }
 
-/** Footer nav on small devices **/
-@media (max-width: 1199px) {
-    /* Stay at the end of the page, with space reserved for the footer
-    usually taking up two rows. */
+/*
+ * Restore Versions tweaks
+ */
 
-    html {
-        position: relative;
-        min-height: 100%;
+#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);
+    }
+}
 
-    body {
-        padding-bottom: 60px;
-    }
+/* Ignore fixed height when manually resized. */
+#restoreTree-container[style*="height"] {
+    max-height: none;
+}
 
-    .navbar-fixed-bottom {
-        position: absolute;
-    }
+/* 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%;
 }
 
 @media (max-width: 768px) {
@@ -335,10 +410,6 @@ ul.three-columns li, ul.two-columns li {
         margin: 3.25px -15px;
     }
 
-    .navbar-fixed-bottom {
-        position: relative;
-    }
-
     .navbar-nav .open .dropdown-menu {
         position: absolute;
         left: auto;
@@ -351,24 +422,19 @@ 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;
-    }
-
-    table.table-condensed td,
-    table.table-condensed th {
-        /* for mobile phones to allow linebreaks in long repro folder/shared with
-        * columns. */
-        white-space: normal;
+        /* height of 5.5 elements + negative margin-top */
+        height: 276px;
     }
 
     .two-columns {
@@ -387,30 +453,24 @@ ul.three-columns li, ul.two-columns li {
     .navbar-nav .open .dropdown-menu > li > a {
         padding: 12px 15px 12px 25px;
     }
-
-    .navbar-fixed-bottom li {
-         width: 100%;
-    }
 }
 
 .tab-content {
     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 */
+    /* 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.
+       The !important is needed to override .visible-xs that sets display to a
+       specific table element instead of block. */
     div[id^='device-'].panel-collapse table,
     div[id^='folder-'].panel-collapse table,
     div[id^='device-'].panel-collapse tbody,
     div[id^='folder-'].panel-collapse tbody,
     div[id^='device-'].panel-collapse tr,
     div[id^='folder-'].panel-collapse tr {
-        display: block;
+        display: block !important;
     }
     div[id^='device-'].panel-collapse th,
     div[id^='folder-'].panel-collapse th,
@@ -421,12 +481,32 @@ 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;
+    }
+
+    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;
+    }
+
+    /* Move share buttons below device ID on small screens. */
+    #shareDeviceIdButtons {
+        display: inline-block;
     }
 }
 
@@ -444,8 +524,32 @@ ul.three-columns li, ul.two-columns li {
     opacity: 1;
 }
 
+.checkbox[disabled] {
+    background-color: #eeeeee;
+    opacity: 1;
+    margin-left: -5px;
+    padding-left: 5px;
+}
+
+.checkbox[disabled] *, .checkbox[disabled] .help-block {
+    color: #999999;
+    cursor: not-allowed;
+}
+
 /* 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;
+}
+
+.select-on-click {
+    -webkit-user-select: all;
+    user-select: all;
+}

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;
+}