Test for previous commit and never ignore entire repo directory

Fix isTempName to work on Windows (fixes #80)

.gitignore

@@ -1,3 +1,4 @@
 syncthing
+syncthing.exe
 *.tar.gz
-dist
+*.zip

assets.sh

@@ -18,7 +18,7 @@ cd gui
 for f in $(find . -type f) ; do 
 	f="${f#./}"
 	echo "gr, _ = gzip.NewReader(bytes.NewBuffer([]byte{"
-	gzip -c $f | od -vt x1 | sed 's/^[0-9a-f]*//' | sed 's/\([0-9a-f][0-9a-f]\)/0x\1,/g'
+	gzip -n -c $f | od -vt x1 | sed 's/^[0-9a-f]*//' | sed 's/\([0-9a-f][0-9a-f]\)/0x\1,/g'
 	echo "}))"
 	echo "data, _ = ioutil.ReadAll(gr)"
 	echo "Assets[\"$f\"] = data"

build.sh

@@ -2,48 +2,90 @@
 
 export COPYFILE_DISABLE=true
 
+distFiles=(README.md LICENSE) # apart from the binary itself
 version=$(git describe --always)
-buildDir=dist
 
-if [[ $fast != yes ]] ; then
+build() {
+	go build -ldflags "-w -X main.Version $version" ./cmd/syncthing	
+}
+
+prepare() {
 	./assets.sh | gofmt > auto/gui.files.go
 	go get -d
+}
+
+test() {
 	go test ./...
-fi
+}	
 
-if [[ -z $1 ]] ; then
-	go build -ldflags "-X main.Version $version"
-elif [[ $1 == "tar" ]] ; then
-	go build -ldflags "-X main.Version $version" \
-	&& mkdir syncthing-dist \
-	&& cp syncthing README.md LICENSE syncthing-dist \
-	&& tar zcvf syncthing-dist.tar.gz syncthing-dist \
-	&& rm -rf syncthing-dist
-elif [[ $1 == "all" ]] ; then
-	rm -rf "$buildDir"
-	mkdir -p "$buildDir" || exit 1
+tarDist() {
+	name="$1"
+	mkdir -p "$name"
+	cp syncthing "${distFiles[@]}" "$name"
+	tar zcvf "$name.tar.gz" "$name"
+	rm -rf "$name"
+}
 
-	export GOARM=7
-	for os in darwin-amd64 linux-amd64 linux-arm freebsd-amd64 windows-amd64 ; do
-		echo "$os"
-		export name="syncthing-$os"
-		export GOOS=${os%-*}
-		export GOARCH=${os#*-}
-		go build -ldflags "-X main.Version $version"
-		mkdir -p "$name"
-		cp README.md LICENSE "$name"
-		case $GOOS in
-			windows)
-				cp syncthing.exe "$buildDir/$name.exe"
-				mv syncthing.exe "$name"
-				zip -qr "$buildDir/$name.zip" "$name"
-				;;
-			*)
-				cp syncthing "$buildDir/$name"
-				mv syncthing "$name"
-				tar zcf "$buildDir/$name.tar.gz" "$name"
-				;;
-		esac
-		rm -r  "$name"
-	done
-fi
+zipDist() {
+	name="$1"
+	mkdir -p "$name"
+	cp syncthing.exe "${distFiles[@]}" "$name"
+	zip -r "$name.zip" "$name"
+	rm -rf "$name"
+}
+
+case "$1" in
+	"")
+		build
+		;;
+
+	tar)
+		rm -f *.tar.gz *.zip
+		prepare
+		test || exit 1
+		build
+
+		eval $(go env)
+		name="syncthing-$GOOS-$GOARCH-$version"
+
+		tarDist "$name"
+		;;
+
+	all)
+		rm -f *.tar.gz *.zip
+		prepare
+		test || exit 1
+
+		export GOARM=7
+		for os in darwin-amd64 linux-amd64 linux-arm freebsd-amd64 windows-amd64 ; do
+			export GOOS=${os%-*}
+			export GOARCH=${os#*-}
+
+			build
+			
+			name="syncthing-$os-$version"
+			case $GOOS in
+				windows)
+					zipDist "$name"
+					rm -f syncthing.exe
+					;;
+				*)
+					tarDist "$name"
+					rm -f syncthing
+					;;
+			esac
+		done
+		;;
+
+	upload)
+		tag=$(git describe)
+		shopt -s nullglob
+		for f in *gz *zip ; do
+			relup calmh/syncthing "$tag" "$f"
+		done
+		;;
+
+	*)
+		echo "Unknown build parameter $1"
+		;;
+esac

cid/cid.go

@@ -0,0 +1,42 @@
+package cid
+
+type Map struct {
+	toCid  map[string]int
+	toName []string
+}
+
+func NewMap() *Map {
+	return &Map{
+		toCid: make(map[string]int),
+	}
+}
+
+func (m *Map) Get(name string) int {
+	cid, ok := m.toCid[name]
+	if ok {
+		return cid
+	}
+
+	// Find a free slot to get a new ID
+	for i, n := range m.toName {
+		if n == "" {
+			m.toName[i] = name
+			m.toCid[name] = i
+			return i
+		}
+	}
+
+	// Add it to the end since we didn't find a free slot
+	m.toName = append(m.toName, name)
+	cid = len(m.toName) - 1
+	m.toCid[name] = cid
+	return cid
+}
+
+func (m *Map) Clear(name string) {
+	cid, ok := m.toCid[name]
+	if ok {
+		m.toName[cid] = ""
+		delete(m.toCid, name)
+	}
+}

cmd/.gitignore

@@ -0,0 +1 @@
+!syncthing

cmd/syncthing/config.go

@@ -36,7 +36,7 @@ type OptionsConfiguration struct {
 	FollowSymlinks     bool     `xml:"followSymlinks" default:"true" ini:"follow-symlinks"`
 	GUIEnabled         bool     `xml:"guiEnabled" default:"true" ini:"gui-enabled"`
 	GUIAddress         string   `xml:"guiAddress" default:"127.0.0.1:8080" ini:"gui-address"`
-	GlobalAnnServer    string   `xml:"globalAnnounceServer" default:"syncthing.nym.se:22025" ini:"global-announce-server"`
+	GlobalAnnServer    string   `xml:"globalAnnounceServer" default:"announce.syncthing.net:22025" ini:"global-announce-server"`
 	GlobalAnnEnabled   bool     `xml:"globalAnnounceEnabled" default:"true" ini:"global-announce-enabled"`
 	LocalAnnEnabled    bool     `xml:"localAnnounceEnabled" default:"true" ini:"local-announce-enabled"`
 	ParallelRequests   int      `xml:"parallelRequests" default:"16" ini:"parallel-requests"`
@@ -44,6 +44,7 @@ type OptionsConfiguration struct {
 	RescanIntervalS    int      `xml:"rescanIntervalS" default:"60" ini:"rescan-interval"`
 	ReconnectIntervalS int      `xml:"reconnectionIntervalS" default:"60" ini:"reconnection-interval"`
 	MaxChangeKbps      int      `xml:"maxChangeKbps" default:"1000" ini:"max-change-bw"`
+	StartBrowser       bool     `xml:"startBrowser" default:"true"`
 }
 
 func setDefaults(data interface{}) error {
@@ -60,11 +61,6 @@ func setDefaults(data interface{}) error {
 			case string:
 				f.SetString(v)
 
-			case []string:
-				rv := reflect.MakeSlice(reflect.TypeOf([]string{}), 1, 1)
-				rv.Index(0).SetString(v)
-				f.Set(rv)
-
 			case int:
 				i, err := strconv.ParseInt(v, 10, 64)
 				if err != nil {
@@ -75,6 +71,11 @@ func setDefaults(data interface{}) error {
 			case bool:
 				f.SetBool(v == "true")
 
+			case []string:
+				// We don't do anything with string slices here. Any default
+				// we set will be appended to by the XML decoder, so we fill
+				// those after decoding.
+
 			default:
 				panic(f.Type())
 			}
@@ -83,6 +84,30 @@ func setDefaults(data interface{}) error {
 	return nil
 }
 
+// fillNilSlices sets default value on slices that are still nil.
+func fillNilSlices(data interface{}) error {
+	s := reflect.ValueOf(data).Elem()
+	t := s.Type()
+
+	for i := 0; i < s.NumField(); i++ {
+		f := s.Field(i)
+		tag := t.Field(i).Tag
+
+		v := tag.Get("default")
+		if len(v) > 0 {
+			switch f.Interface().(type) {
+			case []string:
+				if f.IsNil() {
+					rv := reflect.MakeSlice(reflect.TypeOf([]string{}), 1, 1)
+					rv.Index(0).SetString(v)
+					f.Set(rv)
+				}
+			}
+		}
+	}
+	return nil
+}
+
 func readConfigINI(m map[string]string, data interface{}) error {
 	s := reflect.ValueOf(data).Elem()
 	t := s.Type()
@@ -154,6 +179,8 @@ func readConfigXML(rd io.Reader) (Configuration, error) {
 		err = xml.NewDecoder(rd).Decode(&cfg)
 	}
 
+	fillNilSlices(&cfg.Options)
+
 	cfg.Options.ListenAddress = uniqueStrings(cfg.Options.ListenAddress)
 	return cfg, err
 }

cmd/syncthing/config_test.go

@@ -0,0 +1,116 @@
+package main
+
+import (
+	"bytes"
+	"io"
+	"reflect"
+	"testing"
+)
+
+func TestDefaultValues(t *testing.T) {
+	expected := OptionsConfiguration{
+		ListenAddress:      []string{":22000"},
+		ReadOnly:           false,
+		AllowDelete:        true,
+		FollowSymlinks:     true,
+		GUIEnabled:         true,
+		GUIAddress:         "127.0.0.1:8080",
+		GlobalAnnServer:    "announce.syncthing.net:22025",
+		GlobalAnnEnabled:   true,
+		LocalAnnEnabled:    true,
+		ParallelRequests:   16,
+		MaxSendKbps:        0,
+		RescanIntervalS:    60,
+		ReconnectIntervalS: 60,
+		MaxChangeKbps:      1000,
+		StartBrowser:       true,
+	}
+
+	cfg, err := readConfigXML(bytes.NewReader(nil))
+	if err != io.EOF {
+		t.Error(err)
+	}
+
+	if !reflect.DeepEqual(cfg.Options, expected) {
+		t.Errorf("Default config differs;\n  E: %#v\n  A: %#v", expected, cfg.Options)
+	}
+}
+
+func TestNoListenAddress(t *testing.T) {
+	data := []byte(`<configuration version="1">
+    <repository directory="~/Sync">
+        <node id="..." name="...">
+            <address>dynamic</address>
+        </node>
+    </repository>
+    <options>
+        <listenAddress></listenAddress>
+    </options>
+</configuration>
+`)
+
+	cfg, err := readConfigXML(bytes.NewReader(data))
+	if err != nil {
+		t.Error(err)
+	}
+
+	expected := []string{""}
+	if !reflect.DeepEqual(cfg.Options.ListenAddress, expected) {
+		t.Errorf("Unexpected ListenAddress %#v", cfg.Options.ListenAddress)
+	}
+}
+
+func TestOverriddenValues(t *testing.T) {
+	data := []byte(`<configuration version="1">
+    <repository directory="~/Sync">
+        <node id="..." name="...">
+            <address>dynamic</address>
+        </node>
+    </repository>
+    <options>
+       <listenAddress>:23000</listenAddress>
+        <readOnly>true</readOnly>
+        <allowDelete>false</allowDelete>
+        <followSymlinks>false</followSymlinks>
+        <guiEnabled>false</guiEnabled>
+        <guiAddress>125.2.2.2:8080</guiAddress>
+        <globalAnnounceServer>syncthing.nym.se:22025</globalAnnounceServer>
+        <globalAnnounceEnabled>false</globalAnnounceEnabled>
+        <localAnnounceEnabled>false</localAnnounceEnabled>
+        <parallelRequests>32</parallelRequests>
+        <maxSendKbps>1234</maxSendKbps>
+        <rescanIntervalS>600</rescanIntervalS>
+        <reconnectionIntervalS>6000</reconnectionIntervalS>
+        <maxChangeKbps>2345</maxChangeKbps>
+        <startBrowser>false</startBrowser>
+    </options>
+</configuration>
+`)
+
+	expected := OptionsConfiguration{
+		ListenAddress:      []string{":23000"},
+		ReadOnly:           true,
+		AllowDelete:        false,
+		FollowSymlinks:     false,
+		GUIEnabled:         false,
+		GUIAddress:         "125.2.2.2:8080",
+		GlobalAnnServer:    "syncthing.nym.se:22025",
+		GlobalAnnEnabled:   false,
+		LocalAnnEnabled:    false,
+		ParallelRequests:   32,
+		MaxSendKbps:        1234,
+		RescanIntervalS:    600,
+		ReconnectIntervalS: 6000,
+		MaxChangeKbps:      2345,
+		StartBrowser:       false,
+	}
+
+	cfg, err := readConfigXML(bytes.NewReader(data))
+	if err != nil {
+		t.Error(err)
+	}
+
+	if !reflect.DeepEqual(cfg.Options, expected) {
+		t.Errorf("Overridden config differs;\n  E: %#v\n  A: %#v", expected, cfg.Options)
+	}
+}

cmd/syncthing/debug.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"log"
+	"os"
+	"strings"
+)
+
+var (
+	dlog      = log.New(os.Stderr, "main: ", log.Lmicroseconds|log.Lshortfile)
+	debugNet  = strings.Contains(os.Getenv("STTRACE"), "net")
+	debugIdx  = strings.Contains(os.Getenv("STTRACE"), "idx")
+	debugNeed = strings.Contains(os.Getenv("STTRACE"), "need")
+	debugPull = strings.Contains(os.Getenv("STTRACE"), "pull")
+)

cmd/syncthing/filemonitor.go

@@ -4,13 +4,13 @@ import (
 	"bytes"
 	"errors"
 	"fmt"
-	"log"
 	"os"
 	"path"
 	"sync"
 	"time"
 
 	"github.com/calmh/syncthing/buffers"
+	"github.com/calmh/syncthing/scanner"
 )
 
 type fileMonitor struct {
@@ -18,18 +18,18 @@ type fileMonitor struct {
 	path        string // full path
 	writeDone   sync.WaitGroup
 	model       *Model
-	global      File
-	localBlocks []Block
+	global      scanner.File
+	localBlocks []scanner.Block
 	copyError   error
 	writeError  error
 }
 
 func (m *fileMonitor) FileBegins(cc <-chan content) error {
-	if m.model.trace["file"] {
-		log.Printf("FILE: FileBegins: " + m.name)
+	if debugPull {
+		dlog.Println("file begins:", m.name)
 	}
 
-	tmp := tempName(m.path, m.global.Modified)
+	tmp := defTempNamer.TempName(m.path)
 
 	dir := path.Dir(tmp)
 	_, err := os.Stat(dir)
@@ -109,13 +109,13 @@ func (m *fileMonitor) copyRemoteBlocks(cc <-chan content, outFile *os.File, writ
 }
 
 func (m *fileMonitor) FileDone() error {
-	if m.model.trace["file"] {
-		log.Printf("FILE: FileDone: " + m.name)
+	if debugPull {
+		dlog.Println("file done:", m.name)
 	}
 
 	m.writeDone.Wait()
 
-	tmp := tempName(m.path, m.global.Modified)
+	tmp := defTempNamer.TempName(m.path)
 	defer os.Remove(tmp)
 
 	if m.copyError != nil {
@@ -149,14 +149,14 @@ func (m *fileMonitor) FileDone() error {
 	return nil
 }
 
-func hashCheck(name string, correct []Block) error {
+func hashCheck(name string, correct []scanner.Block) error {
 	rf, err := os.Open(name)
 	if err != nil {
 		return err
 	}
 	defer rf.Close()
 
-	current, err := Blocks(rf, BlockSize)
+	current, err := scanner.Blocks(rf, BlockSize)
 	if err != nil {
 		return err
 	}

cmd/syncthing/filequeue.go

@@ -5,6 +5,8 @@ import (
 	"sort"
 	"sync"
 	"time"
+
+	"github.com/calmh/syncthing/scanner"
 )
 
 type Monitor interface {
@@ -23,7 +25,7 @@ type FileQueue struct {
 
 type queuedFile struct {
 	name         string
-	blocks       []Block
+	blocks       []scanner.Block
 	activeBlocks []bool
 	given        int
 	remaining    int
@@ -54,7 +56,7 @@ func (l queuedFileList) Less(a, b int) bool {
 
 type queuedBlock struct {
 	name  string
-	block Block
+	block scanner.Block
 	index int
 }
 
@@ -65,7 +67,7 @@ func NewFileQueue() *FileQueue {
 	}
 }
 
-func (q *FileQueue) Add(name string, blocks []Block, monitor Monitor) {
+func (q *FileQueue) Add(name string, blocks []scanner.Block, monitor Monitor) {
 	q.fmut.Lock()
 	defer q.fmut.Unlock()
 

cmd/syncthing/filequeue_test.go

@@ -5,6 +5,8 @@ import (
 	"sync"
 	"sync/atomic"
 	"testing"
+
+	"github.com/calmh/syncthing/scanner"
 )
 
 func TestFileQueueAdd(t *testing.T) {
@@ -17,8 +19,8 @@ func TestFileQueueAddSorting(t *testing.T) {
 	q.SetAvailable("zzz", []string{"nodeID"})
 	q.SetAvailable("aaa", []string{"nodeID"})
 
-	q.Add("zzz", []Block{{Offset: 0, Size: 128}, {Offset: 128, Size: 128}}, nil)
-	q.Add("aaa", []Block{{Offset: 0, Size: 128}, {Offset: 128, Size: 128}}, nil)
+	q.Add("zzz", []scanner.Block{{Offset: 0, Size: 128}, {Offset: 128, Size: 128}}, nil)
+	q.Add("aaa", []scanner.Block{{Offset: 0, Size: 128}, {Offset: 128, Size: 128}}, nil)
 	b, _ := q.Get("nodeID")
 	if b.name != "aaa" {
 		t.Errorf("Incorrectly sorted get: %+v", b)
@@ -28,12 +30,12 @@ func TestFileQueueAddSorting(t *testing.T) {
 	q.SetAvailable("zzz", []string{"nodeID"})
 	q.SetAvailable("aaa", []string{"nodeID"})
 
-	q.Add("zzz", []Block{{Offset: 0, Size: 128}, {Offset: 128, Size: 128}}, nil)
+	q.Add("zzz", []scanner.Block{{Offset: 0, Size: 128}, {Offset: 128, Size: 128}}, nil)
 	b, _ = q.Get("nodeID") // Start on zzzz
 	if b.name != "zzz" {
 		t.Errorf("Incorrectly sorted get: %+v", b)
 	}
-	q.Add("aaa", []Block{{Offset: 0, Size: 128}, {Offset: 128, Size: 128}}, nil)
+	q.Add("aaa", []scanner.Block{{Offset: 0, Size: 128}, {Offset: 128, Size: 128}}, nil)
 	b, _ = q.Get("nodeID")
 	if b.name != "zzz" {
 		// Continue rather than starting a new file
@@ -56,12 +58,12 @@ func TestFileQueueGet(t *testing.T) {
 	q.SetAvailable("foo", []string{"nodeID"})
 	q.SetAvailable("bar", []string{"nodeID"})
 
-	q.Add("foo", []Block{
+	q.Add("foo", []scanner.Block{
 		{Offset: 0, Size: 128, Hash: []byte("some foo hash bytes")},
 		{Offset: 128, Size: 128, Hash: []byte("some other foo hash bytes")},
 		{Offset: 256, Size: 128, Hash: []byte("more foo hash bytes")},
 	}, nil)
-	q.Add("bar", []Block{
+	q.Add("bar", []scanner.Block{
 		{Offset: 0, Size: 128, Hash: []byte("some bar hash bytes")},
 		{Offset: 128, Size: 128, Hash: []byte("some other bar hash bytes")},
 	}, nil)
@@ -70,7 +72,7 @@ func TestFileQueueGet(t *testing.T) {
 
 	expected := queuedBlock{
 		name: "bar",
-		block: Block{
+		block: scanner.Block{
 			Offset: 0,
 			Size:   128,
 			Hash:   []byte("some bar hash bytes"),
@@ -89,7 +91,7 @@ func TestFileQueueGet(t *testing.T) {
 
 	expected = queuedBlock{
 		name: "bar",
-		block: Block{
+		block: scanner.Block{
 			Offset: 128,
 			Size:   128,
 			Hash:   []byte("some other bar hash bytes"),
@@ -109,7 +111,7 @@ func TestFileQueueGet(t *testing.T) {
 
 	expected = queuedBlock{
 		name: "foo",
-		block: Block{
+		block: scanner.Block{
 			Offset: 0,
 			Size:   128,
 			Hash:   []byte("some foo hash bytes"),
@@ -150,7 +152,7 @@ func TestFileQueueDone(t *testing.T) {
 	}()
 
 	q := FileQueue{resolver: fakeResolver{}}
-	q.Add("foo", []Block{
+	q.Add("foo", []scanner.Block{
 		{Offset: 0, Length: 128, Hash: []byte("some foo hash bytes")},
 		{Offset: 128, Length: 128, Hash: []byte("some other foo hash bytes")},
 	}, ch)
@@ -181,19 +183,19 @@ func TestFileQueueGetNodeIDs(t *testing.T) {
 	q.SetAvailable("a-foo", []string{"nodeID", "a"})
 	q.SetAvailable("b-bar", []string{"nodeID", "b"})
 
-	q.Add("a-foo", []Block{
+	q.Add("a-foo", []scanner.Block{
 		{Offset: 0, Size: 128, Hash: []byte("some foo hash bytes")},
 		{Offset: 128, Size: 128, Hash: []byte("some other foo hash bytes")},
 		{Offset: 256, Size: 128, Hash: []byte("more foo hash bytes")},
 	}, nil)
-	q.Add("b-bar", []Block{
+	q.Add("b-bar", []scanner.Block{
 		{Offset: 0, Size: 128, Hash: []byte("some bar hash bytes")},
 		{Offset: 128, Size: 128, Hash: []byte("some other bar hash bytes")},
 	}, nil)
 
 	expected := queuedBlock{
 		name: "b-bar",
-		block: Block{
+		block: scanner.Block{
 			Offset: 0,
 			Size:   128,
 			Hash:   []byte("some bar hash bytes"),
@@ -209,7 +211,7 @@ func TestFileQueueGetNodeIDs(t *testing.T) {
 
 	expected = queuedBlock{
 		name: "a-foo",
-		block: Block{
+		block: scanner.Block{
 			Offset: 0,
 			Size:   128,
 			Hash:   []byte("some foo hash bytes"),
@@ -225,7 +227,7 @@ func TestFileQueueGetNodeIDs(t *testing.T) {
 
 	expected = queuedBlock{
 		name: "a-foo",
-		block: Block{
+		block: scanner.Block{
 			Offset: 128,
 			Size:   128,
 			Hash:   []byte("some other foo hash bytes"),
@@ -246,9 +248,9 @@ func TestFileQueueThreadHandling(t *testing.T) {
 
 	const n = 100
 	var total int
-	var blocks []Block
+	var blocks []scanner.Block
 	for i := 1; i <= n; i++ {
-		blocks = append(blocks, Block{Offset: int64(i), Size: 1})
+		blocks = append(blocks, scanner.Block{Offset: int64(i), Size: 1})
 		total += i
 	}
 

cmd/syncthing/gui.go

@@ -9,6 +9,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/calmh/syncthing/scanner"
 	"github.com/codegangsta/martini"
 )
 
@@ -107,7 +108,7 @@ func restPostRestart(req *http.Request) {
 	restart()
 }
 
-type guiFile File
+type guiFile scanner.File
 
 func (f guiFile) MarshalJSON() ([]byte, error) {
 	type t struct {
@@ -116,7 +117,7 @@ func (f guiFile) MarshalJSON() ([]byte, error) {
 	}
 	return json.Marshal(t{
 		Name: f.Name,
-		Size: File(f).Size,
+		Size: scanner.File(f).Size,
 	})
 }
 

cmd/syncthing/logger.go

@@ -13,16 +13,6 @@ func init() {
 	logger = log.New(os.Stderr, "", log.Flags())
 }
 
-func debugln(vals ...interface{}) {
-	s := fmt.Sprintln(vals...)
-	logger.Output(2, "DEBUG: "+s)
-}
-
-func debugf(format string, vals ...interface{}) {
-	s := fmt.Sprintf(format, vals...)
-	logger.Output(2, "DEBUG: "+s)
-}
-
 func infoln(vals ...interface{}) {
 	s := fmt.Sprintln(vals...)
 	logger.Output(2, "INFO: "+s)

cmd/syncthing/main.go

@@ -21,8 +21,11 @@ import (
 	"github.com/calmh/ini"
 	"github.com/calmh/syncthing/discover"
 	"github.com/calmh/syncthing/protocol"
+	"github.com/calmh/syncthing/scanner"
 )
 
+const BlockSize = 128 * 1024
+
 var cfg Configuration
 var Version = "unknown-dev"
 
@@ -31,26 +34,38 @@ var (
 )
 
 var (
-	showVersion  bool
-	confDir      string
-	trace        string
-	profiler     string
-	verbose      bool
-	startupDelay int
+	showVersion bool
+	confDir     string
+	verbose     bool
+)
+
+const (
+	usage      = "syncthing [options]"
+	extraUsage = `The following environemnt variables can be set to facilitate debugging:
+
+ STPROFILER  Set to a listen address such as "127.0.0.1:9090" to start the
+             profiler with HTTP access.
+
+ STTRACE     A comma separated string of facilities to trace. The valid
+             facility strings:
+             - "scanner"  (the file change scanner)
+             - "discover" (the node discovery package)
+             - "net"      (connecting and disconnecting, sent/received messages)
+             - "idx"      (index sending and receiving)
+             - "need"     (file need calculations)
+             - "pull"     (file pull activity)`
 )
 
 func main() {
-	flag.StringVar(&confDir, "home", "~/.syncthing", "Set configuration directory")
-	flag.StringVar(&trace, "debug.trace", "", "(connect,net,idx,file,pull)")
-	flag.StringVar(&profiler, "debug.profiler", "", "(addr)")
+	flag.StringVar(&confDir, "home", getDefaultConfDir(), "Set configuration directory")
 	flag.BoolVar(&showVersion, "version", false, "Show version")
 	flag.BoolVar(&verbose, "v", false, "Be more verbose")
-	flag.IntVar(&startupDelay, "delay", 0, "Startup delay (s)")
-	flag.Usage = usageFor(flag.CommandLine, "syncthing [options]")
+	flag.Usage = usageFor(flag.CommandLine, usage, extraUsage)
 	flag.Parse()
 
-	if startupDelay > 0 {
-		time.Sleep(time.Duration(startupDelay) * time.Second)
+	if len(os.Getenv("STRESTART")) > 0 {
+		// Give the parent process time to exit and release sockets etc.
+		time.Sleep(1 * time.Second)
 	}
 
 	if showVersion {
@@ -66,10 +81,6 @@ func main() {
 		runtime.GOMAXPROCS(runtime.NumCPU())
 	}
 
-	if len(trace) > 0 {
-		log.SetFlags(log.Lshortfile | log.Ldate | log.Ltime | log.Lmicroseconds)
-		logger.SetFlags(log.Lshortfile | log.Ldate | log.Ltime | log.Lmicroseconds)
-	}
 	confDir = expandTilde(confDir)
 
 	// Ensure that our home directory exists and that we have a certificate and key.
@@ -138,7 +149,7 @@ func main() {
 		cfg, err = readConfigXML(nil)
 		cfg.Repositories = []RepositoryConfiguration{
 			{
-				Directory: "~/Sync",
+				Directory: path.Join(getHomeDir(), "Sync"),
 				Nodes: []NodeConfiguration{
 					{NodeID: myID, Addresses: []string{"dynamic"}},
 				},
@@ -154,11 +165,12 @@ func main() {
 
 	var dir = expandTilde(cfg.Repositories[0].Directory)
 
-	if len(profiler) > 0 {
+	if profiler := os.Getenv("STPROFILER"); len(profiler) > 0 {
 		go func() {
+			dlog.Println("Starting profiler on", profiler)
 			err := http.ListenAndServe(profiler, nil)
 			if err != nil {
-				warnln(err)
+				dlog.Fatal(err)
 			}
 		}()
 	}
@@ -178,9 +190,6 @@ func main() {
 
 	ensureDir(dir, -1)
 	m := NewModel(dir, cfg.Options.MaxChangeKbps*1000)
-	for _, t := range strings.Split(trace, ",") {
-		m.Trace(t)
-	}
 	if cfg.Options.MaxSendKbps > 0 {
 		m.LimitRate(cfg.Options.MaxSendKbps)
 	}
@@ -206,7 +215,9 @@ func main() {
 
 			infof("Starting web GUI on http://%s:%d/", hostShow, addr.Port)
 			startGUI(cfg.Options.GUIAddress, m)
-			openURL(fmt.Sprintf("http://%s:%d", hostOpen, addr.Port))
+			if cfg.Options.StartBrowser && len(os.Getenv("STRESTART")) == 0 {
+				openURL(fmt.Sprintf("http://%s:%d", hostOpen, addr.Port))
+			}
 		}
 	}
 
@@ -217,7 +228,17 @@ func main() {
 		infoln("Populating repository index")
 	}
 	loadIndex(m)
-	updateLocalModel(m)
+
+	sup := &suppressor{threshold: int64(cfg.Options.MaxChangeKbps)}
+	w := &scanner.Walker{
+		Dir:            m.dir,
+		IgnoreFile:     ".stignore",
+		FollowSymlinks: cfg.Options.FollowSymlinks,
+		BlockSize:      BlockSize,
+		Suppressor:     sup,
+		TempNamer:      defTempNamer,
+	}
+	updateLocalModel(m, w)
 
 	connOpts := map[string]string{
 		"clientId":      "syncthing",
@@ -263,7 +284,7 @@ func main() {
 		for {
 			time.Sleep(td)
 			if m.LocalAge() > (td / 2).Seconds() {
-				updateLocalModel(m)
+				updateLocalModel(m, w)
 			}
 		}
 	}()
@@ -278,24 +299,17 @@ func main() {
 
 func restart() {
 	infoln("Restarting")
-	args := os.Args
-	doAppend := true
-	for _, arg := range args {
-		if arg == "-delay" {
-			doAppend = false
-			break
-		}
-	}
-	if doAppend {
-		args = append(args, "-delay", "2")
+	env := os.Environ()
+	if len(os.Getenv("STRESTART")) == 0 {
+		env = append(env, "STRESTART=1")
 	}
 	pgm, err := exec.LookPath(os.Args[0])
 	if err != nil {
 		warnln(err)
 		return
 	}
-	proc, err := os.StartProcess(pgm, args, &os.ProcAttr{
-		Env:   os.Environ(),
+	proc, err := os.StartProcess(pgm, os.Args, &os.ProcAttr{
+		Env:   env,
 		Files: []*os.File{os.Stdin, os.Stdout, os.Stderr},
 	})
 	if err != nil {
@@ -328,6 +342,13 @@ func saveConfigLoop(cfgFile string) {
 			continue
 		}
 
+		if runtime.GOOS == "windows" {
+			err := os.Remove(cfgFile)
+			if err != nil && !os.IsNotExist(err) {
+				warnln(err)
+			}
+		}
+
 		err = os.Rename(cfgFile+".tmp", cfgFile)
 		if err != nil {
 			warnln(err)
@@ -371,8 +392,8 @@ func printStatsLoop(m *Model) {
 }
 
 func listen(myID string, addr string, m *Model, tlsCfg *tls.Config, connOpts map[string]string) {
-	if strings.Contains(trace, "connect") {
-		debugln("NET: Listening on", addr)
+	if debugNet {
+		dlog.Println("listening on", addr)
 	}
 	l, err := tls.Listen("tcp", addr, tlsCfg)
 	fatalErr(err)
@@ -385,8 +406,8 @@ listen:
 			continue
 		}
 
-		if strings.Contains(trace, "connect") {
-			debugln("NET: Connect from", conn.RemoteAddr())
+		if debugNet {
+			dlog.Println("connect from", conn.RemoteAddr())
 		}
 
 		tc := conn.(*tls.Conn)
@@ -467,13 +488,13 @@ func connect(myID string, disc *discover.Discoverer, m *Model, tlsCfg *tls.Confi
 					}
 				}
 
-				if strings.Contains(trace, "connect") {
-					debugln("NET: Dial", nodeCfg.NodeID, addr)
+				if debugNet {
+					dlog.Println("dial", nodeCfg.NodeID, addr)
 				}
 				conn, err := tls.Dial("tcp", addr, tlsCfg)
 				if err != nil {
-					if strings.Contains(trace, "connect") {
-						debugln("NET:", err)
+					if debugNet {
+						dlog.Println(err)
 					}
 					continue
 				}
@@ -495,8 +516,8 @@ func connect(myID string, disc *discover.Discoverer, m *Model, tlsCfg *tls.Confi
 	}
 }
 
-func updateLocalModel(m *Model) {
-	files, _ := m.Walk(cfg.Options.FollowSymlinks)
+func updateLocalModel(m *Model, w *scanner.Walker) {
+	files, _ := w.Walk()
 	m.ReplaceLocal(files)
 	saveIndex(m)
 }
@@ -554,16 +575,38 @@ func ensureDir(dir string, mode int) {
 }
 
 func expandTilde(p string) string {
+	if runtime.GOOS == "windows" {
+		return p
+	}
+
 	if strings.HasPrefix(p, "~/") {
-		return strings.Replace(p, "~", getHomeDir(), 1)
+		return strings.Replace(p, "~", getUnixHomeDir(), 1)
 	}
 	return p
 }
 
-func getHomeDir() string {
+func getUnixHomeDir() string {
 	home := os.Getenv("HOME")
 	if home == "" {
 		fatalln("No home directory?")
 	}
 	return home
 }
+
+func getHomeDir() string {
+	if runtime.GOOS == "windows" {
+		home := os.Getenv("HOMEDRIVE") + os.Getenv("HOMEPATH")
+		if home == "" {
+			home = os.Getenv("USERPROFILE")
+		}
+		return home
+	}
+	return getUnixHomeDir()
+}
+
+func getDefaultConfDir() string {
+	if runtime.GOOS == "windows" {
+		return path.Join(os.Getenv("AppData"), "syncthing")
+	}
+	return expandTilde("~/.syncthing")
+}

cmd/syncthing/model.go

@@ -13,16 +13,17 @@ import (
 
 	"github.com/calmh/syncthing/buffers"
 	"github.com/calmh/syncthing/protocol"
+	"github.com/calmh/syncthing/scanner"
 )
 
 type Model struct {
 	dir string
 
-	global    map[string]File // the latest version of each file as it exists in the cluster
-	gmut      sync.RWMutex    // protects global
-	local     map[string]File // the files we currently have locally on disk
-	lmut      sync.RWMutex    // protects local
-	remote    map[string]map[string]File
+	global    map[string]scanner.File // the latest version of each file as it exists in the cluster
+	gmut      sync.RWMutex            // protects global
+	local     map[string]scanner.File // the files we currently have locally on disk
+	lmut      sync.RWMutex            // protects local
+	remote    map[string]map[string]scanner.File
 	rmut      sync.RWMutex // protects remote
 	protoConn map[string]Connection
 	rawConn   map[string]io.Closer
@@ -31,7 +32,7 @@ type Model struct {
 	// Queue for files to fetch. fq can call back into the model, so we must ensure
 	// to hold no locks when calling methods on fq.
 	fq *FileQueue
-	dq chan File // queue for files to delete
+	dq chan scanner.File // queue for files to delete
 
 	updatedLocal        int64 // timestamp of last update to local
 	updateGlobal        int64 // timestamp of last update to remote
@@ -43,8 +44,6 @@ type Model struct {
 	delete    bool
 	initmut   sync.Mutex // protects rwRunning and delete
 
-	trace map[string]bool
-
 	sup suppressor
 
 	parallelRequests int
@@ -77,16 +76,15 @@ var (
 func NewModel(dir string, maxChangeBw int) *Model {
 	m := &Model{
 		dir:          dir,
-		global:       make(map[string]File),
-		local:        make(map[string]File),
-		remote:       make(map[string]map[string]File),
+		global:       make(map[string]scanner.File),
+		local:        make(map[string]scanner.File),
+		remote:       make(map[string]map[string]scanner.File),
 		protoConn:    make(map[string]Connection),
 		rawConn:      make(map[string]io.Closer),
 		lastIdxBcast: time.Now(),
-		trace:        make(map[string]bool),
 		sup:          suppressor{threshold: int64(maxChangeBw)},
 		fq:           NewFileQueue(),
-		dq:           make(chan File),
+		dq:           make(chan scanner.File),
 	}
 
 	go m.broadcastIndexLoop()
@@ -108,11 +106,6 @@ func (m *Model) LimitRate(kbps int) {
 	}()
 }
 
-// Trace enables trace logging of the given facility. This is a debugging function; grep for m.trace.
-func (m *Model) Trace(t string) {
-	m.trace[t] = true
-}
-
 // StartRW starts read/write processing on the current model. When in
 // read/write mode the model will attempt to keep in sync with the cluster by
 // pulling needed files from peer nodes.
@@ -128,7 +121,6 @@ func (m *Model) StartRW(del bool, threads int) {
 	m.delete = del
 	m.parallelRequests = threads
 
-	go m.cleanTempFiles()
 	if del {
 		go m.deleteLoop()
 	}
@@ -191,7 +183,10 @@ func (m *Model) ConnectionStats() map[string]ConnectionInfo {
 			}
 		}
 
-		ci.Completion = int(100 * have / tot)
+		ci.Completion = 100
+		if tot != 0 {
+			ci.Completion = int(100 * have / tot)
+		}
 
 		res[node] = ci
 	}
@@ -257,7 +252,7 @@ func (m *Model) InSyncSize() (files, bytes int64) {
 }
 
 // NeedFiles returns the list of currently needed files and the total size.
-func (m *Model) NeedFiles() (files []File, bytes int64) {
+func (m *Model) NeedFiles() (files []scanner.File, bytes int64) {
 	qf := m.fq.QueuedFiles()
 
 	m.gmut.RLock()
@@ -275,7 +270,7 @@ func (m *Model) NeedFiles() (files []File, bytes int64) {
 // Index is called when a new node is connected and we receive their full index.
 // Implements the protocol.Model interface.
 func (m *Model) Index(nodeID string, fs []protocol.FileInfo) {
-	var files = make([]File, len(fs))
+	var files = make([]scanner.File, len(fs))
 	for i := range fs {
 		files[i] = fileFromFileInfo(fs[i])
 	}
@@ -283,11 +278,11 @@ func (m *Model) Index(nodeID string, fs []protocol.FileInfo) {
 	m.imut.Lock()
 	defer m.imut.Unlock()
 
-	if m.trace["net"] {
-		debugf("NET IDX(in): %s: %d files", nodeID, len(fs))
+	if debugNet {
+		dlog.Printf("IDX(in): %s: %d files", nodeID, len(fs))
 	}
 
-	repo := make(map[string]File)
+	repo := make(map[string]scanner.File)
 	for _, f := range files {
 		m.indexUpdate(repo, f)
 	}
@@ -303,7 +298,7 @@ func (m *Model) Index(nodeID string, fs []protocol.FileInfo) {
 // IndexUpdate is called for incremental updates to connected nodes' indexes.
 // Implements the protocol.Model interface.
 func (m *Model) IndexUpdate(nodeID string, fs []protocol.FileInfo) {
-	var files = make([]File, len(fs))
+	var files = make([]scanner.File, len(fs))
 	for i := range fs {
 		files[i] = fileFromFileInfo(fs[i])
 	}
@@ -311,8 +306,8 @@ func (m *Model) IndexUpdate(nodeID string, fs []protocol.FileInfo) {
 	m.imut.Lock()
 	defer m.imut.Unlock()
 
-	if m.trace["net"] {
-		debugf("NET IDXUP(in): %s: %d files", nodeID, len(files))
+	if debugNet {
+		dlog.Printf("IDXUP(in): %s: %d files", nodeID, len(files))
 	}
 
 	m.rmut.Lock()
@@ -332,13 +327,13 @@ func (m *Model) IndexUpdate(nodeID string, fs []protocol.FileInfo) {
 	m.recomputeNeedForFiles(files)
 }
 
-func (m *Model) indexUpdate(repo map[string]File, f File) {
-	if m.trace["idx"] {
+func (m *Model) indexUpdate(repo map[string]scanner.File, f scanner.File) {
+	if debugIdx {
 		var flagComment string
 		if f.Flags&protocol.FlagDeleted != 0 {
 			flagComment = " (deleted)"
 		}
-		debugf("IDX(in): %q m=%d f=%o%s v=%d (%d blocks)", f.Name, f.Modified, f.Flags, flagComment, f.Version, len(f.Blocks))
+		dlog.Printf("IDX(in): %q m=%d f=%o%s v=%d (%d blocks)", f.Name, f.Modified, f.Flags, flagComment, f.Version, len(f.Blocks))
 	}
 
 	if extraFlags := f.Flags &^ (protocol.FlagInvalid | protocol.FlagDeleted | 0xfff); extraFlags != 0 {
@@ -352,8 +347,8 @@ func (m *Model) indexUpdate(repo map[string]File, f File) {
 // Close removes the peer from the model and closes the underlying connection if possible.
 // Implements the protocol.Model interface.
 func (m *Model) Close(node string, err error) {
-	if m.trace["net"] {
-		debugf("NET: %s: %v", node, err)
+	if debugNet {
+		dlog.Printf("%s: %v", node, err)
 	}
 	if err == protocol.ErrClusterHash {
 		warnf("Connection to %s closed due to mismatched cluster hash. Ensure that the configured cluster members are identical on both nodes.", node)
@@ -402,8 +397,8 @@ func (m *Model) Request(nodeID, repo, name string, offset int64, size int) ([]by
 		return nil, ErrInvalid
 	}
 
-	if m.trace["net"] && nodeID != "<local>" {
-		debugf("NET REQ(in): %s: %q o=%d s=%d", nodeID, name, offset, size)
+	if debugNet && nodeID != "<local>" {
+		dlog.Printf("REQ(in): %s: %q o=%d s=%d", nodeID, name, offset, size)
 	}
 	fn := path.Join(m.dir, name)
 	fd, err := os.Open(fn) // XXX: Inefficient, should cache fd?
@@ -428,9 +423,9 @@ func (m *Model) Request(nodeID, repo, name string, offset int64, size int) ([]by
 }
 
 // ReplaceLocal replaces the local repository index with the given list of files.
-func (m *Model) ReplaceLocal(fs []File) {
+func (m *Model) ReplaceLocal(fs []scanner.File) {
 	var updated bool
-	var newLocal = make(map[string]File)
+	var newLocal = make(map[string]scanner.File)
 
 	m.lmut.RLock()
 	for _, f := range fs {
@@ -471,7 +466,7 @@ func (m *Model) ReplaceLocal(fs []File) {
 // the local index from a cache file at startup.
 func (m *Model) SeedLocal(fs []protocol.FileInfo) {
 	m.lmut.Lock()
-	m.local = make(map[string]File)
+	m.local = make(map[string]scanner.File)
 	for _, f := range fs {
 		m.local[f.Name] = fileFromFileInfo(f)
 	}
@@ -506,6 +501,9 @@ func (m *Model) AddConnection(rawConn io.Closer, protoConn Connection) {
 
 	go func() {
 		idx := m.ProtocolIndex()
+		if debugNet {
+			dlog.Printf("IDX(out/initial): %s: %d files", nodeID, len(idx))
+		}
 		protoConn.Index("default", idx)
 	}()
 
@@ -519,14 +517,14 @@ func (m *Model) AddConnection(rawConn io.Closer, protoConn Connection) {
 	for i := 0; i < m.parallelRequests; i++ {
 		i := i
 		go func() {
-			if m.trace["pull"] {
-				debugln("PULL: Starting", nodeID, i)
+			if debugPull {
+				dlog.Println("starting puller:", nodeID, i)
 			}
 			for {
 				m.pmut.RLock()
 				if _, ok := m.protoConn[nodeID]; !ok {
-					if m.trace["pull"] {
-						debugln("PULL: Exiting", nodeID, i)
+					if debugPull {
+						dlog.Println("stopping puller:", nodeID, i)
 					}
 					m.pmut.RUnlock()
 					return
@@ -535,8 +533,8 @@ func (m *Model) AddConnection(rawConn io.Closer, protoConn Connection) {
 
 				qb, ok := m.fq.Get(nodeID)
 				if ok {
-					if m.trace["pull"] {
-						debugln("PULL: Request", nodeID, i, qb.name, qb.block.Offset)
+					if debugPull {
+						dlog.Println("request: out", nodeID, i, qb.name, qb.block.Offset)
 					}
 					data, _ := protoConn.Request("default", qb.name, qb.block.Offset, int(qb.block.Size))
 					m.fq.Done(qb.name, qb.block.Offset, data)
@@ -557,12 +555,12 @@ func (m *Model) ProtocolIndex() []protocol.FileInfo {
 
 	for _, f := range m.local {
 		mf := fileInfoFromFile(f)
-		if m.trace["idx"] {
+		if debugIdx {
 			var flagComment string
 			if mf.Flags&protocol.FlagDeleted != 0 {
 				flagComment = " (deleted)"
 			}
-			debugf("IDX(out): %q m=%d f=%o%s v=%d (%d blocks)", mf.Name, mf.Modified, mf.Flags, flagComment, mf.Version, len(mf.Blocks))
+			dlog.Printf("IDX(out): %q m=%d f=%o%s v=%d (%d blocks)", mf.Name, mf.Modified, mf.Flags, flagComment, mf.Version, len(mf.Blocks))
 		}
 		index = append(index, mf)
 	}
@@ -580,8 +578,8 @@ func (m *Model) requestGlobal(nodeID, name string, offset int64, size int, hash
 		return nil, fmt.Errorf("requestGlobal: no such node: %s", nodeID)
 	}
 
-	if m.trace["net"] {
-		debugf("NET REQ(out): %s: %q o=%d s=%d h=%x", nodeID, name, offset, size, hash)
+	if debugNet {
+		dlog.Printf("REQ(out): %s: %q o=%d s=%d h=%x", nodeID, name, offset, size, hash)
 	}
 
 	return nc.Request("default", name, offset, size)
@@ -608,8 +606,8 @@ func (m *Model) broadcastIndexLoop() {
 			m.pmut.RLock()
 			for _, node := range m.protoConn {
 				node := node
-				if m.trace["net"] {
-					debugf("NET IDX(out/loop): %s: %d files", node.ID(), len(idx))
+				if debugNet {
+					dlog.Printf("IDX(out/loop): %s: %d files", node.ID(), len(idx))
 				}
 				go func() {
 					node.Index("default", idx)
@@ -625,7 +623,7 @@ func (m *Model) broadcastIndexLoop() {
 }
 
 // markDeletedLocals sets the deleted flag on files that have gone missing locally.
-func (m *Model) markDeletedLocals(newLocal map[string]File) bool {
+func (m *Model) markDeletedLocals(newLocal map[string]scanner.File) bool {
 	// For every file in the existing local table, check if they are also
 	// present in the new local table. If they are not, check that we already
 	// had the newest version available according to the global table and if so
@@ -655,7 +653,7 @@ func (m *Model) markDeletedLocals(newLocal map[string]File) bool {
 	return updated
 }
 
-func (m *Model) updateLocal(f File) {
+func (m *Model) updateLocal(f scanner.File) {
 	var updated bool
 
 	m.lmut.Lock()
@@ -682,7 +680,7 @@ func (m *Model) updateLocal(f File) {
 /*
 XXX: Not done, needs elegant handling of availability
 
-func (m *Model) recomputeGlobalFor(files []File) bool {
+func (m *Model) recomputeGlobalFor(files []scanner.File) bool {
 	m.gmut.Lock()
 	defer m.gmut.Unlock()
 
@@ -699,7 +697,7 @@ func (m *Model) recomputeGlobalFor(files []File) bool {
 */
 
 func (m *Model) recomputeGlobal() {
-	var newGlobal = make(map[string]File)
+	var newGlobal = make(map[string]scanner.File)
 
 	m.lmut.RLock()
 	for n, f := range m.local {
@@ -758,12 +756,12 @@ func (m *Model) recomputeGlobal() {
 
 type addOrder struct {
 	n      string
-	remote []Block
+	remote []scanner.Block
 	fm     *fileMonitor
 }
 
 func (m *Model) recomputeNeedForGlobal() {
-	var toDelete []File
+	var toDelete []scanner.File
 	var toAdd []addOrder
 
 	m.gmut.RLock()
@@ -782,8 +780,8 @@ func (m *Model) recomputeNeedForGlobal() {
 	}
 }
 
-func (m *Model) recomputeNeedForFiles(files []File) {
-	var toDelete []File
+func (m *Model) recomputeNeedForFiles(files []scanner.File) {
+	var toDelete []scanner.File
 	var toAdd []addOrder
 
 	m.gmut.RLock()
@@ -802,7 +800,7 @@ func (m *Model) recomputeNeedForFiles(files []File) {
 	}
 }
 
-func (m *Model) recomputeNeedForFile(gf File, toAdd []addOrder, toDelete []File) ([]addOrder, []File) {
+func (m *Model) recomputeNeedForFile(gf scanner.File, toAdd []addOrder, toDelete []scanner.File) ([]addOrder, []scanner.File) {
 	m.lmut.RLock()
 	lf, ok := m.local[gf.Name]
 	m.lmut.RUnlock()
@@ -820,14 +818,14 @@ func (m *Model) recomputeNeedForFile(gf File, toAdd []addOrder, toDelete []File)
 			// Don't have the file, so don't need to delete it
 			return toAdd, toDelete
 		}
-		if m.trace["need"] {
-			debugf("NEED: lf:%v gf:%v", lf, gf)
+		if debugNeed {
+			dlog.Printf("need: lf:%v gf:%v", lf, gf)
 		}
 
 		if gf.Flags&protocol.FlagDeleted != 0 {
 			toDelete = append(toDelete, gf)
 		} else {
-			local, remote := BlockDiff(lf.Blocks, gf.Blocks)
+			local, remote := scanner.BlockDiff(lf.Blocks, gf.Blocks)
 			fm := fileMonitor{
 				name:        gf.Name,
 				path:        path.Clean(path.Join(m.dir, gf.Name)),
@@ -862,8 +860,8 @@ func (m *Model) WhoHas(name string) []string {
 
 func (m *Model) deleteLoop() {
 	for file := range m.dq {
-		if m.trace["file"] {
-			debugln("FILE: Delete", file.Name)
+		if debugPull {
+			dlog.Println("delete", file.Name)
 		}
 		path := path.Clean(path.Join(m.dir, file.Name))
 		err := os.Remove(path)
@@ -875,18 +873,18 @@ func (m *Model) deleteLoop() {
 	}
 }
 
-func fileFromFileInfo(f protocol.FileInfo) File {
-	var blocks = make([]Block, len(f.Blocks))
+func fileFromFileInfo(f protocol.FileInfo) scanner.File {
+	var blocks = make([]scanner.Block, len(f.Blocks))
 	var offset int64
 	for i, b := range f.Blocks {
-		blocks[i] = Block{
+		blocks[i] = scanner.Block{
 			Offset: offset,
 			Size:   b.Size,
 			Hash:   b.Hash,
 		}
 		offset += int64(b.Size)
 	}
-	return File{
+	return scanner.File{
 		Name:     f.Name,
 		Size:     offset,
 		Flags:    f.Flags,
@@ -896,7 +894,7 @@ func fileFromFileInfo(f protocol.FileInfo) File {
 	}
 }
 
-func fileInfoFromFile(f File) protocol.FileInfo {
+func fileInfoFromFile(f scanner.File) protocol.FileInfo {
 	var blocks = make([]protocol.BlockInfo, len(f.Blocks))
 	for i, b := range f.Blocks {
 		blocks[i] = protocol.BlockInfo{

cmd/syncthing/model_test.go

@@ -9,6 +9,7 @@ import (
 	"time"
 
 	"github.com/calmh/syncthing/protocol"
+	"github.com/calmh/syncthing/scanner"
 )
 
 func TestNewModel(t *testing.T) {
@@ -27,27 +28,27 @@ func TestNewModel(t *testing.T) {
 	}
 }
 
-var testDataExpected = map[string]File{
-	"foo": File{
+var testDataExpected = map[string]scanner.File{
+	"foo": scanner.File{
 		Name:     "foo",
 		Flags:    0,
 		Modified: 0,
 		Size:     7,
-		Blocks:   []Block{{Offset: 0x0, Size: 0x7, Hash: []uint8{0xae, 0xc0, 0x70, 0x64, 0x5f, 0xe5, 0x3e, 0xe3, 0xb3, 0x76, 0x30, 0x59, 0x37, 0x61, 0x34, 0xf0, 0x58, 0xcc, 0x33, 0x72, 0x47, 0xc9, 0x78, 0xad, 0xd1, 0x78, 0xb6, 0xcc, 0xdf, 0xb0, 0x1, 0x9f}}},
+		Blocks:   []scanner.Block{{Offset: 0x0, Size: 0x7, Hash: []uint8{0xae, 0xc0, 0x70, 0x64, 0x5f, 0xe5, 0x3e, 0xe3, 0xb3, 0x76, 0x30, 0x59, 0x37, 0x61, 0x34, 0xf0, 0x58, 0xcc, 0x33, 0x72, 0x47, 0xc9, 0x78, 0xad, 0xd1, 0x78, 0xb6, 0xcc, 0xdf, 0xb0, 0x1, 0x9f}}},
 	},
-	"empty": File{
+	"empty": scanner.File{
 		Name:     "empty",
 		Flags:    0,
 		Modified: 0,
 		Size:     0,
-		Blocks:   []Block{{Offset: 0x0, Size: 0x0, Hash: []uint8{0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14, 0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24, 0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c, 0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55}}},
+		Blocks:   []scanner.Block{{Offset: 0x0, Size: 0x0, Hash: []uint8{0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14, 0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24, 0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c, 0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55}}},
 	},
-	"bar": File{
+	"bar": scanner.File{
 		Name:     "bar",
 		Flags:    0,
 		Modified: 0,
 		Size:     10,
-		Blocks:   []Block{{Offset: 0x0, Size: 0xa, Hash: []uint8{0x2f, 0x72, 0xcc, 0x11, 0xa6, 0xfc, 0xd0, 0x27, 0x1e, 0xce, 0xf8, 0xc6, 0x10, 0x56, 0xee, 0x1e, 0xb1, 0x24, 0x3b, 0xe3, 0x80, 0x5b, 0xf9, 0xa9, 0xdf, 0x98, 0xf9, 0x2f, 0x76, 0x36, 0xb0, 0x5c}}},
+		Blocks:   []scanner.Block{{Offset: 0x0, Size: 0xa, Hash: []uint8{0x2f, 0x72, 0xcc, 0x11, 0xa6, 0xfc, 0xd0, 0x27, 0x1e, 0xce, 0xf8, 0xc6, 0x10, 0x56, 0xee, 0x1e, 0xb1, 0x24, 0x3b, 0xe3, 0x80, 0x5b, 0xf9, 0xa9, 0xdf, 0x98, 0xf9, 0x2f, 0x76, 0x36, 0xb0, 0x5c}}},
 	},
 }
 
@@ -63,7 +64,8 @@ func init() {
 
 func TestUpdateLocal(t *testing.T) {
 	m := NewModel("testdata", 1e6)
-	fs, _ := m.Walk(false)
+	w := scanner.Walker{Dir: "testdata", IgnoreFile: ".stignore", BlockSize: 128 * 1024}
+	fs, _ := w.Walk()
 	m.ReplaceLocal(fs)
 
 	if fs, _ := m.NeedFiles(); len(fs) > 0 {
@@ -105,7 +107,8 @@ func TestUpdateLocal(t *testing.T) {
 
 func TestRemoteUpdateExisting(t *testing.T) {
 	m := NewModel("testdata", 1e6)
-	fs, _ := m.Walk(false)
+	w := scanner.Walker{Dir: "testdata", IgnoreFile: ".stignore", BlockSize: 128 * 1024}
+	fs, _ := w.Walk()
 	m.ReplaceLocal(fs)
 
 	newFile := protocol.FileInfo{
@@ -122,7 +125,8 @@ func TestRemoteUpdateExisting(t *testing.T) {
 
 func TestRemoteAddNew(t *testing.T) {
 	m := NewModel("testdata", 1e6)
-	fs, _ := m.Walk(false)
+	w := scanner.Walker{Dir: "testdata", IgnoreFile: ".stignore", BlockSize: 128 * 1024}
+	fs, _ := w.Walk()
 	m.ReplaceLocal(fs)
 
 	newFile := protocol.FileInfo{
@@ -139,7 +143,8 @@ func TestRemoteAddNew(t *testing.T) {
 
 func TestRemoteUpdateOld(t *testing.T) {
 	m := NewModel("testdata", 1e6)
-	fs, _ := m.Walk(false)
+	w := scanner.Walker{Dir: "testdata", IgnoreFile: ".stignore", BlockSize: 128 * 1024}
+	fs, _ := w.Walk()
 	m.ReplaceLocal(fs)
 
 	oldTimeStamp := int64(1234)
@@ -157,7 +162,8 @@ func TestRemoteUpdateOld(t *testing.T) {
 
 func TestRemoteIndexUpdate(t *testing.T) {
 	m := NewModel("testdata", 1e6)
-	fs, _ := m.Walk(false)
+	w := scanner.Walker{Dir: "testdata", IgnoreFile: ".stignore", BlockSize: 128 * 1024}
+	fs, _ := w.Walk()
 	m.ReplaceLocal(fs)
 
 	foo := protocol.FileInfo{
@@ -190,7 +196,8 @@ func TestRemoteIndexUpdate(t *testing.T) {
 
 func TestDelete(t *testing.T) {
 	m := NewModel("testdata", 1e6)
-	fs, _ := m.Walk(false)
+	w := scanner.Walker{Dir: "testdata", IgnoreFile: ".stignore", BlockSize: 128 * 1024}
+	fs, _ := w.Walk()
 	m.ReplaceLocal(fs)
 
 	if l1, l2 := len(m.local), len(fs); l1 != l2 {
@@ -201,10 +208,10 @@ func TestDelete(t *testing.T) {
 	}
 
 	ot := time.Now().Unix()
-	newFile := File{
+	newFile := scanner.File{
 		Name:     "a new file",
 		Modified: ot,
-		Blocks:   []Block{{0, 100, []byte("some hash bytes")}},
+		Blocks:   []scanner.Block{{0, 100, []byte("some hash bytes")}},
 	}
 	m.updateLocal(newFile)
 
@@ -292,7 +299,8 @@ func TestDelete(t *testing.T) {
 
 func TestForgetNode(t *testing.T) {
 	m := NewModel("testdata", 1e6)
-	fs, _ := m.Walk(false)
+	w := scanner.Walker{Dir: "testdata", IgnoreFile: ".stignore", BlockSize: 128 * 1024}
+	fs, _ := w.Walk()
 	m.ReplaceLocal(fs)
 
 	if l1, l2 := len(m.local), len(fs); l1 != l2 {
@@ -345,7 +353,8 @@ func TestForgetNode(t *testing.T) {
 
 func TestRequest(t *testing.T) {
 	m := NewModel("testdata", 1e6)
-	fs, _ := m.Walk(false)
+	w := scanner.Walker{Dir: "testdata", IgnoreFile: ".stignore", BlockSize: 128 * 1024}
+	fs, _ := w.Walk()
 	m.ReplaceLocal(fs)
 
 	bs, err := m.Request("some node", "default", "foo", 0, 6)
@@ -367,7 +376,8 @@ func TestRequest(t *testing.T) {
 
 func TestIgnoreWithUnknownFlags(t *testing.T) {
 	m := NewModel("testdata", 1e6)
-	fs, _ := m.Walk(false)
+	w := scanner.Walker{Dir: "testdata", IgnoreFile: ".stignore", BlockSize: 128 * 1024}
+	fs, _ := w.Walk()
 	m.ReplaceLocal(fs)
 
 	valid := protocol.FileInfo{
@@ -410,7 +420,8 @@ func genFiles(n int) []protocol.FileInfo {
 
 func BenchmarkIndex10000(b *testing.B) {
 	m := NewModel("testdata", 1e6)
-	fs, _ := m.Walk(false)
+	w := scanner.Walker{Dir: "testdata", IgnoreFile: ".stignore", BlockSize: 128 * 1024}
+	fs, _ := w.Walk()
 	m.ReplaceLocal(fs)
 	files := genFiles(10000)
 
@@ -422,7 +433,8 @@ func BenchmarkIndex10000(b *testing.B) {
 
 func BenchmarkIndex00100(b *testing.B) {
 	m := NewModel("testdata", 1e6)
-	fs, _ := m.Walk(false)
+	w := scanner.Walker{Dir: "testdata", IgnoreFile: ".stignore", BlockSize: 128 * 1024}
+	fs, _ := w.Walk()
 	m.ReplaceLocal(fs)
 	files := genFiles(100)
 
@@ -434,7 +446,8 @@ func BenchmarkIndex00100(b *testing.B) {
 
 func BenchmarkIndexUpdate10000f10000(b *testing.B) {
 	m := NewModel("testdata", 1e6)
-	fs, _ := m.Walk(false)
+	w := scanner.Walker{Dir: "testdata", IgnoreFile: ".stignore", BlockSize: 128 * 1024}
+	fs, _ := w.Walk()
 	m.ReplaceLocal(fs)
 	files := genFiles(10000)
 	m.Index("42", files)
@@ -447,7 +460,8 @@ func BenchmarkIndexUpdate10000f10000(b *testing.B) {
 
 func BenchmarkIndexUpdate10000f00100(b *testing.B) {
 	m := NewModel("testdata", 1e6)
-	fs, _ := m.Walk(false)
+	w := scanner.Walker{Dir: "testdata", IgnoreFile: ".stignore", BlockSize: 128 * 1024}
+	fs, _ := w.Walk()
 	m.ReplaceLocal(fs)
 	files := genFiles(10000)
 	m.Index("42", files)
@@ -461,7 +475,8 @@ func BenchmarkIndexUpdate10000f00100(b *testing.B) {
 
 func BenchmarkIndexUpdate10000f00001(b *testing.B) {
 	m := NewModel("testdata", 1e6)
-	fs, _ := m.Walk(false)
+	w := scanner.Walker{Dir: "testdata", IgnoreFile: ".stignore", BlockSize: 128 * 1024}
+	fs, _ := w.Walk()
 	m.ReplaceLocal(fs)
 	files := genFiles(10000)
 	m.Index("42", files)
@@ -506,7 +521,8 @@ func (FakeConnection) Statistics() protocol.Statistics {
 
 func BenchmarkRequest(b *testing.B) {
 	m := NewModel("testdata", 1e6)
-	fs, _ := m.Walk(false)
+	w := scanner.Walker{Dir: "testdata", IgnoreFile: ".stignore", BlockSize: 128 * 1024}
+	fs, _ := w.Walk()
 	m.ReplaceLocal(fs)
 
 	const n = 1000

cmd/syncthing/suppressor.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"os"
 	"sync"
 	"time"
 )
@@ -51,6 +52,11 @@ func (h *changeHistory) append(size int64, t time.Time) {
 	h.changes = append(h.changes, c)
 }
 
+func (s *suppressor) Suppress(name string, fi os.FileInfo) bool {
+	sup, _ := s.suppress(name, fi.Size(), time.Now())
+	return sup
+}
+
 func (s *suppressor) suppress(name string, size int64, t time.Time) (bool, bool) {
 	s.Lock()
 

cmd/syncthing/tempname.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"fmt"
+	"path"
+	"path/filepath"
+	"runtime"
+	"strings"
+)
+
+type tempNamer struct {
+	prefix string
+}
+
+var defTempNamer = tempNamer{".syncthing"}
+
+func (t tempNamer) IsTemporary(name string) bool {
+	if runtime.GOOS == "windows" {
+		name = filepath.ToSlash(name)
+	}
+	return strings.HasPrefix(path.Base(name), t.prefix)
+}
+
+func (t tempNamer) TempName(name string) string {
+	tdir := path.Dir(name)
+	tname := fmt.Sprintf("%s.%s", t.prefix, path.Base(name))
+	return path.Join(tdir, tname)
+}

cmd/syncthing/usage.go

@@ -22,18 +22,14 @@ func optionTable(w io.Writer, rows [][]string) {
 	tw.Flush()
 }
 
-func usageFor(fs *flag.FlagSet, usage string) func() {
+func usageFor(fs *flag.FlagSet, usage string, extra string) func() {
 	return func() {
 		var b bytes.Buffer
 		b.WriteString("Usage:\n  " + usage + "\n")
 
 		var options [][]string
 		fs.VisitAll(func(f *flag.Flag) {
-			var dash = "-"
-			if len(f.Name) > 1 {
-				dash = "--"
-			}
-			var opt = "  " + dash + f.Name
+			var opt = "  -" + f.Name
 
 			if f.DefValue != "false" {
 				opt += "=" + f.DefValue
@@ -48,5 +44,9 @@ func usageFor(fs *flag.FlagSet, usage string) func() {
 		}
 
 		fmt.Println(b.String())
+
+		if len(extra) > 0 {
+			fmt.Println(extra)
+		}
 	}
 }

discover/debug.go

@@ -0,0 +1,12 @@
+package discover
+
+import (
+	"log"
+	"os"
+	"strings"
+)
+
+var (
+	dlog  = log.New(os.Stderr, "discover: ", log.Lmicroseconds|log.Lshortfile)
+	debug = strings.Contains(os.Getenv("STTRACE"), "discover")
+)

discover/discover.go

@@ -15,7 +15,6 @@ import (
 
 const (
 	AnnouncementPort = 21025
-	Debug            = false
 )
 
 type Discoverer struct {
@@ -80,24 +79,75 @@ func (d *Discoverer) sendAnnouncements() {
 	var errCounter = 0
 	var err error
 
+	remote := &net.UDPAddr{
+		IP:   net.IP{255, 255, 255, 255},
+		Port: AnnouncementPort,
+	}
+
 	for errCounter < maxErrors {
-		for _, ipStr := range allBroadcasts() {
-			var addrStr = ipStr + ":21025"
+		intfs, err := net.Interfaces()
+		if err != nil {
+			log.Printf("discover/listInterfaces: %v; no local announcements", err)
+			return
+		}
 
-			remote, err := net.ResolveUDPAddr("udp4", addrStr)
-			if err != nil {
-				log.Printf("discover/external: %v; no external announcements", err)
-				return
-			}
+		for _, intf := range intfs {
+			if intf.Flags&(net.FlagBroadcast|net.FlagLoopback) == net.FlagBroadcast {
+				addrs, err := intf.Addrs()
+				if err != nil {
+					log.Println("discover/listAddrs: warning:", err)
+					errCounter++
+					continue
+				}
 
-			if Debug {
-				log.Println("send announcement -> ", remote)
-			}
-			_, _, err = d.conn.WriteMsgUDP(buf, nil, remote)
-			if err != nil {
-				log.Println("discover/write: warning:", err)
-				errCounter++
-			} else {
+				var srcAddr string
+				for _, addr := range addrs {
+					if strings.Contains(addr.String(), ".") {
+						// Found an IPv4 adress
+						parts := strings.Split(addr.String(), "/")
+						srcAddr = parts[0]
+						break
+					}
+				}
+				if len(srcAddr) == 0 {
+					if debug {
+						dlog.Println("no source address found on interface", intf.Name)
+					}
+					continue
+				}
+
+				iaddr, err := net.ResolveUDPAddr("udp4", srcAddr+":0")
+				if err != nil {
+					log.Println("discover/resolve: warning:", err)
+					errCounter++
+					continue
+				}
+
+				conn, err := net.ListenUDP("udp4", iaddr)
+				if err != nil {
+					log.Println("discover/listen: warning:", err)
+					errCounter++
+					continue
+				}
+
+				if debug {
+					dlog.Println("send announcement from", conn.LocalAddr(), "to", remote, "on", intf.Name)
+				}
+
+				_, err = conn.WriteTo(buf, remote)
+				if err != nil {
+					// Some interfaces don't seem to support broadcast even though the flags claims they do, i.e. vmnet
+					conn.Close()
+
+					if debug {
+						log.Println(err)
+					}
+
+					errCounter++
+					continue
+				}
+
+				conn.Close()
 				errCounter = 0
 			}
 		}
@@ -122,10 +172,10 @@ func (d *Discoverer) sendExtAnnouncements() {
 	var errCounter = 0
 
 	for errCounter < maxErrors {
-		if Debug {
-			log.Println("send announcement -> ", remote)
+		if debug {
+			dlog.Println("send announcement -> ", remote)
 		}
-		_, _, err = d.conn.WriteMsgUDP(buf, nil, remote)
+		_, err = d.conn.WriteTo(buf, remote)
 		if err != nil {
 			log.Println("discover/write: warning:", err)
 			errCounter++
@@ -149,8 +199,8 @@ func (d *Discoverer) recvAnnouncements() {
 			continue
 		}
 
-		if Debug {
-			log.Printf("read announcement:\n%s", hex.Dump(buf[:n]))
+		if debug {
+			dlog.Printf("read announcement:\n%s", hex.Dump(buf[:n]))
 		}
 
 		var pkt AnnounceV2
@@ -161,8 +211,8 @@ func (d *Discoverer) recvAnnouncements() {
 			continue
 		}
 
-		if Debug {
-			log.Printf("read announcement: %#v", pkt)
+		if debug {
+			dlog.Printf("parsed announcement: %#v", pkt)
 		}
 
 		errCounter = 0
@@ -178,8 +228,8 @@ func (d *Discoverer) recvAnnouncements() {
 				}
 				addrs = append(addrs, nodeAddr)
 			}
-			if Debug {
-				log.Printf("register: %#v", addrs)
+			if debug {
+				dlog.Printf("register: %#v", addrs)
 			}
 			d.registryLock.Lock()
 			_, seen := d.registry[pkt.NodeID]
@@ -236,8 +286,8 @@ func (d *Discoverer) externalLookup(node string) []string {
 		return nil
 	}
 
-	if Debug {
-		log.Printf("read external:\n%s", hex.Dump(buf[:n]))
+	if debug {
+		dlog.Printf("read external:\n%s", hex.Dump(buf[:n]))
 	}
 
 	var pkt AnnounceV2
@@ -247,8 +297,8 @@ func (d *Discoverer) externalLookup(node string) []string {
 		return nil
 	}
 
-	if Debug {
-		log.Printf("read external: %#v", pkt)
+	if debug {
+		dlog.Printf("parsed external: %#v", pkt)
 	}
 
 	var addrs []string
@@ -289,38 +339,3 @@ func ipStr(ip []byte) string {
 	}
 	return strings.Join(ss, s)
 }
-
-func allBroadcasts() []string {
-	var bcasts = make(map[string]bool)
-	addrs, err := net.InterfaceAddrs()
-	if err != nil {
-		return nil
-	}
-
-	for _, addr := range addrs {
-		switch {
-		case strings.HasPrefix(addr.String(), "127."):
-			// Ignore v4 localhost
-
-		case strings.Contains(addr.String(), ":"):
-			// Ignore all v6, because we need link local multicast there which I haven't implemented
-
-		default:
-			if in, ok := addr.(*net.IPNet); ok {
-				il := len(in.IP) - 1
-				ml := len(in.Mask) - 1
-				for i := range in.Mask {
-					in.IP[il-i] = in.IP[il-i] | ^in.Mask[ml-i]
-				}
-				parts := strings.Split(in.String(), "/")
-				bcasts[parts[0]] = true
-			}
-		}
-	}
-
-	var l []string
-	for ip := range bcasts {
-		l = append(l, ip)
-	}
-	return l
-}

files/set.go

@@ -0,0 +1,173 @@
+package fileset
+
+import "sync"
+
+type File struct {
+	Key      Key
+	Modified int64
+	Flags    uint32
+	Data     interface{}
+}
+
+type Key struct {
+	Name    string
+	Version uint32
+}
+
+type fileRecord struct {
+	Usage int
+	File  File
+}
+
+type bitset uint64
+
+func (a Key) newerThan(b Key) bool {
+	return a.Version > b.Version
+}
+
+type Set struct {
+	mutex              sync.RWMutex
+	files              map[Key]fileRecord
+	remoteKey          [64]map[string]Key
+	globalAvailability map[string]bitset
+	globalKey          map[string]Key
+}
+
+func NewSet() *Set {
+	var m = Set{
+		files:              make(map[Key]fileRecord),
+		globalAvailability: make(map[string]bitset),
+		globalKey:          make(map[string]Key),
+	}
+	return &m
+}
+
+func (m *Set) AddLocal(fs []File) {
+	m.mutex.Lock()
+	m.unlockedAddRemote(0, fs)
+	m.mutex.Unlock()
+}
+
+func (m *Set) SetLocal(fs []File) {
+	m.mutex.Lock()
+	m.unlockedSetRemote(0, fs)
+	m.mutex.Unlock()
+}
+
+func (m *Set) AddRemote(cid uint, fs []File) {
+	if cid < 1 || cid > 63 {
+		panic("Connection ID must be in the range 1 - 63 inclusive")
+	}
+	m.mutex.Lock()
+	m.unlockedAddRemote(cid, fs)
+	m.mutex.Unlock()
+}
+
+func (m *Set) SetRemote(cid uint, fs []File) {
+	if cid < 1 || cid > 63 {
+		panic("Connection ID must be in the range 1 - 63 inclusive")
+	}
+	m.mutex.Lock()
+	m.unlockedSetRemote(cid, fs)
+	m.mutex.Unlock()
+}
+
+func (m *Set) unlockedAddRemote(cid uint, fs []File) {
+	remFiles := m.remoteKey[cid]
+	for _, f := range fs {
+		n := f.Key.Name
+
+		if ck, ok := remFiles[n]; ok && ck == f.Key {
+			// The remote already has exactly this file, skip it
+			continue
+		}
+
+		remFiles[n] = f.Key
+
+		// Keep the block list or increment the usage
+		if br, ok := m.files[f.Key]; !ok {
+			m.files[f.Key] = fileRecord{
+				Usage: 1,
+				File:  f,
+			}
+		} else {
+			br.Usage++
+			m.files[f.Key] = br
+		}
+
+		// Update global view
+		gk, ok := m.globalKey[n]
+		switch {
+		case ok && f.Key == gk:
+			av := m.globalAvailability[n]
+			av |= 1 << cid
+			m.globalAvailability[n] = av
+		case f.Key.newerThan(gk):
+			m.globalKey[n] = f.Key
+			m.globalAvailability[n] = 1 << cid
+		}
+	}
+}
+
+func (m *Set) unlockedSetRemote(cid uint, fs []File) {
+	// Decrement usage for all files belonging to this remote, and remove
+	// those that are no longer needed.
+	for _, fk := range m.remoteKey[cid] {
+		br, ok := m.files[fk]
+		switch {
+		case ok && br.Usage == 1:
+			delete(m.files, fk)
+		case ok && br.Usage > 1:
+			br.Usage--
+			m.files[fk] = br
+		}
+	}
+
+	// Clear existing remote remoteKey
+	m.remoteKey[cid] = make(map[string]Key)
+
+	// Recalculate global based on all remaining remoteKey
+	for n := range m.globalKey {
+		var nk Key    // newest key
+		var na bitset // newest availability
+
+		for i, rem := range m.remoteKey {
+			if rk, ok := rem[n]; ok {
+				switch {
+				case rk == nk:
+					na |= 1 << uint(i)
+				case rk.newerThan(nk):
+					nk = rk
+					na = 1 << uint(i)
+				}
+			}
+		}
+
+		if na != 0 {
+			// Someone had the file
+			m.globalKey[n] = nk
+			m.globalAvailability[n] = na
+		} else {
+			// Noone had the file
+			delete(m.globalKey, n)
+			delete(m.globalAvailability, n)
+		}
+	}
+
+	// Add new remote remoteKey to the mix
+	m.unlockedAddRemote(cid, fs)
+}
+
+func (m *Set) Need(cid uint) []File {
+	var fs []File
+	m.mutex.Lock()
+
+	for name, gk := range m.globalKey {
+		if gk.newerThan(m.remoteKey[cid][name]) {
+			fs = append(fs, m.files[gk].File)
+		}
+	}
+
+	m.mutex.Unlock()
+	return fs
+}

files/set_test.go

@@ -0,0 +1,207 @@
+package fileset
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+)
+
+func TestGlobalSet(t *testing.T) {
+	m := NewSet()
+
+	local := []File{
+		File{Key{"a", 1000}, 0, 0, nil},
+		File{Key{"b", 1000}, 0, 0, nil},
+		File{Key{"c", 1000}, 0, 0, nil},
+		File{Key{"d", 1000}, 0, 0, nil},
+	}
+
+	remote := []File{
+		File{Key{"a", 1000}, 0, 0, nil},
+		File{Key{"b", 1001}, 0, 0, nil},
+		File{Key{"c", 1002}, 0, 0, nil},
+		File{Key{"e", 1000}, 0, 0, nil},
+	}
+
+	expectedGlobal := map[string]Key{
+		"a": local[0].Key,
+		"b": remote[1].Key,
+		"c": remote[2].Key,
+		"d": local[3].Key,
+		"e": remote[3].Key,
+	}
+
+	m.SetLocal(local)
+	m.SetRemote(1, remote)
+
+	if !reflect.DeepEqual(m.globalKey, expectedGlobal) {
+		t.Errorf("Global incorrect;\n%v !=\n%v", m.globalKey, expectedGlobal)
+	}
+
+	if lb := len(m.files); lb != 7 {
+		t.Errorf("Num files incorrect %d != 7\n%v", lb, m.files)
+	}
+}
+
+func BenchmarkSetLocal10k(b *testing.B) {
+	m := NewSet()
+
+	var local []File
+	for i := 0; i < 10000; i++ {
+		local = append(local, File{Key{fmt.Sprintf("file%d"), 1000}, 0, 0, nil})
+	}
+
+	var remote []File
+	for i := 0; i < 10000; i++ {
+		remote = append(remote, File{Key{fmt.Sprintf("file%d"), 1000}, 0, 0, nil})
+	}
+
+	m.SetRemote(1, remote)
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		m.SetLocal(local)
+	}
+}
+
+func BenchmarkSetLocal10(b *testing.B) {
+	m := NewSet()
+
+	var local []File
+	for i := 0; i < 10; i++ {
+		local = append(local, File{Key{fmt.Sprintf("file%d"), 1000}, 0, 0, nil})
+	}
+
+	var remote []File
+	for i := 0; i < 10000; i++ {
+		remote = append(remote, File{Key{fmt.Sprintf("file%d"), 1000}, 0, 0, nil})
+	}
+
+	m.SetRemote(1, remote)
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		m.SetLocal(local)
+	}
+}
+
+func BenchmarkAddLocal10k(b *testing.B) {
+	m := NewSet()
+
+	var local []File
+	for i := 0; i < 10000; i++ {
+		local = append(local, File{Key{fmt.Sprintf("file%d"), 1000}, 0, 0, nil})
+	}
+
+	var remote []File
+	for i := 0; i < 10000; i++ {
+		remote = append(remote, File{Key{fmt.Sprintf("file%d"), 1000}, 0, 0, nil})
+	}
+
+	m.SetRemote(1, remote)
+	m.SetLocal(local)
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		b.StopTimer()
+		for j := range local {
+			local[j].Key.Version++
+		}
+		b.StartTimer()
+		m.AddLocal(local)
+	}
+}
+
+func BenchmarkAddLocal10(b *testing.B) {
+	m := NewSet()
+
+	var local []File
+	for i := 0; i < 10; i++ {
+		local = append(local, File{Key{fmt.Sprintf("file%d"), 1000}, 0, 0, nil})
+	}
+
+	var remote []File
+	for i := 0; i < 10000; i++ {
+		remote = append(remote, File{Key{fmt.Sprintf("file%d"), 1000}, 0, 0, nil})
+	}
+
+	m.SetRemote(1, remote)
+	m.SetLocal(local)
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		for j := range local {
+			local[j].Key.Version++
+		}
+		m.AddLocal(local)
+	}
+}
+
+func TestGlobalReset(t *testing.T) {
+	m := NewSet()
+
+	local := []File{
+		File{Key{"a", 1000}, 0, 0, nil},
+		File{Key{"b", 1000}, 0, 0, nil},
+		File{Key{"c", 1000}, 0, 0, nil},
+		File{Key{"d", 1000}, 0, 0, nil},
+	}
+
+	remote := []File{
+		File{Key{"a", 1000}, 0, 0, nil},
+		File{Key{"b", 1001}, 0, 0, nil},
+		File{Key{"c", 1002}, 0, 0, nil},
+		File{Key{"e", 1000}, 0, 0, nil},
+	}
+
+	expectedGlobalKey := map[string]Key{
+		"a": local[0].Key,
+		"b": local[1].Key,
+		"c": local[2].Key,
+		"d": local[3].Key,
+	}
+
+	m.SetLocal(local)
+	m.SetRemote(1, remote)
+	m.SetRemote(1, nil)
+
+	if !reflect.DeepEqual(m.globalKey, expectedGlobalKey) {
+		t.Errorf("Global incorrect;\n%v !=\n%v", m.globalKey, expectedGlobalKey)
+	}
+
+	if lb := len(m.files); lb != 4 {
+		t.Errorf("Num files incorrect %d != 4\n%v", lb, m.files)
+	}
+}
+
+func TestNeed(t *testing.T) {
+	m := NewSet()
+
+	local := []File{
+		File{Key{"a", 1000}, 0, 0, nil},
+		File{Key{"b", 1000}, 0, 0, nil},
+		File{Key{"c", 1000}, 0, 0, nil},
+		File{Key{"d", 1000}, 0, 0, nil},
+	}
+
+	remote := []File{
+		File{Key{"a", 1000}, 0, 0, nil},
+		File{Key{"b", 1001}, 0, 0, nil},
+		File{Key{"c", 1002}, 0, 0, nil},
+		File{Key{"e", 1000}, 0, 0, nil},
+	}
+
+	shouldNeed := []File{
+		File{Key{"b", 1001}, 0, 0, nil},
+		File{Key{"c", 1002}, 0, 0, nil},
+		File{Key{"e", 1000}, 0, 0, nil},
+	}
+
+	m.SetLocal(local)
+	m.SetRemote(1, remote)
+
+	need := m.Need(0)
+	if !reflect.DeepEqual(need, shouldNeed) {
+		t.Errorf("Need incorrect;\n%v !=\n%v", need, shouldNeed)
+	}
+}

gui/app.js

@@ -32,6 +32,7 @@ syncthing.controller('SyncthingCtrl', function ($scope, $http) {
         {id: 'FollowSymlinks', descr: 'Follow Symlinks', type: 'bool', restart: true},
         {id: 'GlobalAnnEnabled', descr: 'Global Announce', type: 'bool', restart: true},
         {id: 'LocalAnnEnabled', descr: 'Local Announce', type: 'bool', restart: true},
+        {id: 'StartBrowser', descr: 'Start Browser', type: 'bool'},
     ];
 
     function modelGetSucceeded() {
@@ -317,7 +318,7 @@ syncthing.controller('SyncthingCtrl', function ($scope, $http) {
         }
         return errors;
     };
-    
+
     $scope.clearErrors = function () {
         $scope.seenError = $scope.errors[$scope.errors.length - 1].Time;
     };

scanner/blocks.go

@@ -1,4 +1,4 @@
-package main
+package scanner
 
 import (
 	"bytes"

scanner/blocks_test.go

@@ -1,4 +1,4 @@
-package main
+package scanner
 
 import (
 	"bytes"

scanner/debug.go

@@ -0,0 +1,12 @@
+package scanner
+
+import (
+	"log"
+	"os"
+	"strings"
+)
+
+var (
+	dlog  = log.New(os.Stderr, "scanner: ", log.Lmicroseconds|log.Lshortfile)
+	debug = strings.Contains(os.Getenv("STTRACE"), "scanner")
+)

scanner/file.go

@@ -0,0 +1,25 @@
+package scanner
+
+import "fmt"
+
+type File struct {
+	Name     string
+	Flags    uint32
+	Modified int64
+	Version  uint32
+	Size     int64
+	Blocks   []Block
+}
+
+func (f File) String() string {
+	return fmt.Sprintf("File{Name:%q, Flags:0x%x, Modified:%d, Version:%d, Size:%d, NumBlocks:%d}",
+		f.Name, f.Flags, f.Modified, f.Version, f.Size, len(f.Blocks))
+}
+
+func (f File) Equals(o File) bool {
+	return f.Modified == o.Modified && f.Version == o.Version
+}
+
+func (f File) NewerThan(o File) bool {
+	return f.Modified > o.Modified || (f.Modified == o.Modified && f.Version > o.Version)
+}

scanner/testdata/.stignore

@@ -0,0 +1,2 @@
+.*
+quux

scanner/testdata/bar

@@ -0,0 +1 @@
+foobarbaz

scanner/testdata/baz/quux

@@ -0,0 +1 @@
+baazquux

scanner/testdata/foo

@@ -0,0 +1 @@
+foobar

scanner/walk.go

@@ -0,0 +1,268 @@
+package scanner
+
+import (
+	"bytes"
+	"io/ioutil"
+	"log"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/calmh/syncthing/protocol"
+)
+
+type Walker struct {
+	// Dir is the base directory for the walk
+	Dir string
+	// If FollowSymlinks is true, symbolic links directly under Dir will be followed.
+	// Symbolic links at deeper levels are never followed regardless of this flag.
+	FollowSymlinks bool
+	// BlockSize controls the size of the block used when hashing.
+	BlockSize int
+	// If IgnoreFile is not empty, it is the name used for the file that holds ignore patterns.
+	IgnoreFile string
+	// If TempNamer is not nil, it is used to ignore tempory files when walking.
+	TempNamer TempNamer
+	// If Suppressor is not nil, it is queried for supression of modified files.
+	Suppressor Suppressor
+
+	previous   map[string]File // file name -> last seen file state
+	suppressed map[string]bool // file name -> suppression status
+}
+
+type TempNamer interface {
+	// Temporary returns a temporary name for the filed referred to by path.
+	TempName(path string) string
+	// IsTemporary returns true if path refers to the name of temporary file.
+	IsTemporary(path string) bool
+}
+
+type Suppressor interface {
+	// Supress returns true if the update to the named file should be ignored.
+	Suppress(name string, fi os.FileInfo) bool
+}
+
+// Walk returns the list of files found in the local repository by scanning the
+// file system. Files are blockwise hashed.
+func (w *Walker) Walk() (files []File, ignore map[string][]string) {
+	w.lazyInit()
+
+	if debug {
+		dlog.Println("Walk", w.Dir, w.FollowSymlinks, w.BlockSize, w.IgnoreFile)
+	}
+	t0 := time.Now()
+
+	ignore = make(map[string][]string)
+	hashFiles := w.walkAndHashFiles(&files, ignore)
+
+	filepath.Walk(w.Dir, w.loadIgnoreFiles(w.Dir, ignore))
+	filepath.Walk(w.Dir, hashFiles)
+
+	if w.FollowSymlinks {
+		d, err := os.Open(w.Dir)
+		if err != nil {
+			return
+		}
+		defer d.Close()
+
+		fis, err := d.Readdir(-1)
+		if err != nil {
+			return
+		}
+
+		for _, info := range fis {
+			if info.Mode()&os.ModeSymlink != 0 {
+				dir := path.Join(w.Dir, info.Name()) + "/"
+				filepath.Walk(dir, w.loadIgnoreFiles(dir, ignore))
+				filepath.Walk(dir, hashFiles)
+			}
+		}
+	}
+
+	if debug {
+		t1 := time.Now()
+		d := t1.Sub(t0).Seconds()
+		dlog.Printf("Walk in %.02f ms, %.0f files/s", d*1000, float64(len(files))/d)
+	}
+	return
+}
+
+// CleanTempFiles removes all files that match the temporary filename pattern.
+func (w *Walker) CleanTempFiles() {
+	filepath.Walk(w.Dir, w.cleanTempFile)
+}
+
+func (w *Walker) lazyInit() {
+	if w.previous == nil {
+		w.previous = make(map[string]File)
+		w.suppressed = make(map[string]bool)
+	}
+}
+
+func (w *Walker) loadIgnoreFiles(dir string, ign map[string][]string) filepath.WalkFunc {
+	return func(p string, info os.FileInfo, err error) error {
+		if err != nil {
+			return nil
+		}
+
+		rn, err := filepath.Rel(dir, p)
+		if err != nil {
+			return nil
+		}
+
+		if pn, sn := path.Split(rn); sn == w.IgnoreFile {
+			pn := strings.Trim(pn, "/")
+			bs, _ := ioutil.ReadFile(p)
+			lines := bytes.Split(bs, []byte("\n"))
+			var patterns []string
+			for _, line := range lines {
+				if len(line) > 0 {
+					patterns = append(patterns, string(line))
+				}
+			}
+			ign[pn] = patterns
+		}
+
+		return nil
+	}
+}
+
+func (w *Walker) walkAndHashFiles(res *[]File, ign map[string][]string) filepath.WalkFunc {
+	return func(p string, info os.FileInfo, err error) error {
+		if err != nil {
+			if debug {
+				dlog.Println("error:", p, info, err)
+			}
+			return nil
+		}
+
+		rn, err := filepath.Rel(w.Dir, p)
+		if err != nil {
+			if debug {
+				dlog.Println("rel error:", p, err)
+			}
+			return nil
+		}
+
+		if w.TempNamer != nil && w.TempNamer.IsTemporary(rn) {
+			if debug {
+				dlog.Println("temporary:", rn)
+			}
+			return nil
+		}
+
+		if _, sn := path.Split(rn); sn == w.IgnoreFile {
+			if debug {
+				dlog.Println("ignorefile:", rn)
+			}
+			return nil
+		}
+
+		if rn != "." && w.ignoreFile(ign, rn) {
+			if debug {
+				dlog.Println("ignored:", rn)
+			}
+			if info.IsDir() {
+				return filepath.SkipDir
+			}
+			return nil
+		}
+
+		if info.Mode()&os.ModeType == 0 {
+			modified := info.ModTime().Unix()
+			pf := w.previous[rn]
+
+			if pf.Modified == modified {
+				if nf := uint32(info.Mode()); nf != pf.Flags {
+					if debug {
+						dlog.Println("new flags:", rn)
+					}
+					pf.Flags = nf
+					pf.Version++
+					w.previous[rn] = pf
+				} else if debug {
+					dlog.Println("unchanged:", rn)
+				}
+				*res = append(*res, pf)
+				return nil
+			}
+
+			if w.Suppressor != nil && w.Suppressor.Suppress(rn, info) {
+				if debug {
+					dlog.Println("suppressed:", rn)
+				}
+				if !w.suppressed[rn] {
+					w.suppressed[rn] = true
+					log.Printf("INFO: Changes to %q are being temporarily suppressed because it changes too frequently.", p)
+				}
+				f := pf
+				f.Flags = protocol.FlagInvalid
+				f.Blocks = nil
+				*res = append(*res, f)
+				return nil
+			} else if w.suppressed[rn] {
+				log.Printf("INFO: Changes to %q are no longer suppressed.", p)
+				delete(w.suppressed, rn)
+			}
+
+			fd, err := os.Open(p)
+			if err != nil {
+				if debug {
+					dlog.Println("open:", p, err)
+				}
+				return nil
+			}
+			defer fd.Close()
+
+			t0 := time.Now()
+			blocks, err := Blocks(fd, w.BlockSize)
+			if err != nil {
+				if debug {
+					dlog.Println("hash error:", rn, err)
+				}
+				return nil
+			}
+			if debug {
+				t1 := time.Now()
+				dlog.Println("hashed:", rn, ";", len(blocks), "blocks;", info.Size(), "bytes;", int(float64(info.Size())/1024/t1.Sub(t0).Seconds()), "KB/s")
+			}
+			f := File{
+				Name:     rn,
+				Size:     info.Size(),
+				Flags:    uint32(info.Mode()),
+				Modified: modified,
+				Blocks:   blocks,
+			}
+			w.previous[rn] = f
+			*res = append(*res, f)
+		}
+
+		return nil
+	}
+}
+
+func (w *Walker) cleanTempFile(path string, info os.FileInfo, err error) error {
+	if err != nil {
+		return err
+	}
+	if info.Mode()&os.ModeType == 0 && w.TempNamer.IsTemporary(path) {
+		os.Remove(path)
+	}
+	return nil
+}
+
+func (w *Walker) ignoreFile(patterns map[string][]string, file string) bool {
+	first, last := path.Split(file)
+	for prefix, pats := range patterns {
+		if len(prefix) == 0 || prefix == first || strings.HasPrefix(first, prefix+"/") {
+			for _, pattern := range pats {
+				if match, _ := path.Match(pattern, last); match {
+					return true
+				}
+			}
+		}
+	}
+	return false
+}

scanner/walk_test.go

@@ -1,4 +1,4 @@
-package main
+package scanner
 
 import (
 	"fmt"
@@ -22,8 +22,12 @@ var correctIgnores = map[string][]string{
 }
 
 func TestWalk(t *testing.T) {
-	m := NewModel("testdata", 1e6)
-	files, ignores := m.Walk(false)
+	w := Walker{
+		Dir:        "testdata",
+		BlockSize:  128 * 1024,
+		IgnoreFile: ".stignore",
+	}
+	files, ignores := w.Walk()
 
 	if l1, l2 := len(files), len(testdata); l1 != l2 {
 		t.Fatalf("Incorrect number of walked files %d != %d", l1, l2)
@@ -75,8 +79,9 @@ func TestIgnore(t *testing.T) {
 		{"foo/bazz/quux", false},
 	}
 
+	w := Walker{}
 	for i, tc := range tests {
-		if r := ignoreFile(patterns, tc.f); r != tc.r {
+		if r := w.ignoreFile(patterns, tc.f); r != tc.r {
 			t.Errorf("Incorrect ignoreFile() #%d; E: %v, A: %v", i, tc.r, r)
 		}
 	}

walk.go

@@ -1,238 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"fmt"
-	"io/ioutil"
-	"log"
-	"os"
-	"path"
-	"path/filepath"
-	"strings"
-	"time"
-
-	"github.com/calmh/syncthing/protocol"
-)
-
-const BlockSize = 128 * 1024
-
-type File struct {
-	Name     string
-	Flags    uint32
-	Modified int64
-	Version  uint32
-	Size     int64
-	Blocks   []Block
-}
-
-func (f File) String() string {
-	return fmt.Sprintf("File{Name:%q, Flags:0x%x, Modified:%d, Version:%d, Size:%d, NumBlocks:%d}",
-		f.Name, f.Flags, f.Modified, f.Version, f.Size, len(f.Blocks))
-}
-
-func (f File) Equals(o File) bool {
-	return f.Modified == o.Modified && f.Version == o.Version
-}
-
-func (f File) NewerThan(o File) bool {
-	return f.Modified > o.Modified || (f.Modified == o.Modified && f.Version > o.Version)
-}
-
-func isTempName(name string) bool {
-	return strings.HasPrefix(path.Base(name), ".syncthing.")
-}
-
-func tempName(name string, modified int64) string {
-	tdir := path.Dir(name)
-	tname := fmt.Sprintf(".syncthing.%s.%d", path.Base(name), modified)
-	return path.Join(tdir, tname)
-}
-
-func (m *Model) loadIgnoreFiles(ign map[string][]string) filepath.WalkFunc {
-	return func(p string, info os.FileInfo, err error) error {
-		if err != nil {
-			return nil
-		}
-
-		rn, err := filepath.Rel(m.dir, p)
-		if err != nil {
-			return nil
-		}
-
-		if pn, sn := path.Split(rn); sn == ".stignore" {
-			pn := strings.Trim(pn, "/")
-			bs, _ := ioutil.ReadFile(p)
-			lines := bytes.Split(bs, []byte("\n"))
-			var patterns []string
-			for _, line := range lines {
-				if len(line) > 0 {
-					patterns = append(patterns, string(line))
-				}
-			}
-			ign[pn] = patterns
-		}
-
-		return nil
-	}
-}
-
-func (m *Model) walkAndHashFiles(res *[]File, ign map[string][]string) filepath.WalkFunc {
-	return func(p string, info os.FileInfo, err error) error {
-		if err != nil {
-			if m.trace["file"] {
-				log.Printf("FILE: %q: %v", p, err)
-			}
-			return nil
-		}
-
-		if isTempName(p) {
-			return nil
-		}
-
-		rn, err := filepath.Rel(m.dir, p)
-		if err != nil {
-			return nil
-		}
-
-		if _, sn := path.Split(rn); sn == ".stignore" {
-			// We never sync the .stignore files
-			return nil
-		}
-
-		if ignoreFile(ign, rn) {
-			if m.trace["file"] {
-				log.Println("FILE: IGNORE:", rn)
-			}
-			return nil
-		}
-
-		if info.Mode()&os.ModeType == 0 {
-			modified := info.ModTime().Unix()
-
-			m.lmut.RLock()
-			lf, ok := m.local[rn]
-			m.lmut.RUnlock()
-
-			if ok && lf.Modified == modified {
-				if nf := uint32(info.Mode()); nf != lf.Flags {
-					lf.Flags = nf
-					lf.Version++
-				}
-				*res = append(*res, lf)
-			} else {
-				if cur, prev := m.sup.suppress(rn, info.Size(), time.Now()); cur {
-					if m.trace["file"] {
-						log.Printf("FILE: SUPPRESS: %q change bw over threshold", rn)
-					}
-					if !prev {
-						log.Printf("INFO: Changes to %q are being temporarily suppressed because it changes too frequently.", rn)
-					}
-
-					if ok {
-						lf.Flags = protocol.FlagInvalid
-						lf.Version++
-						*res = append(*res, lf)
-					}
-					return nil
-				} else if prev && !cur {
-					log.Printf("INFO: Changes to %q are no longer suppressed.", rn)
-				}
-
-				if m.trace["file"] {
-					log.Printf("FILE: Hash %q", p)
-				}
-				fd, err := os.Open(p)
-				if err != nil {
-					if m.trace["file"] {
-						log.Printf("FILE: %q: %v", p, err)
-					}
-					return nil
-				}
-				defer fd.Close()
-
-				blocks, err := Blocks(fd, BlockSize)
-				if err != nil {
-					if m.trace["file"] {
-						log.Printf("FILE: %q: %v", p, err)
-					}
-					return nil
-				}
-				f := File{
-					Name:     rn,
-					Size:     info.Size(),
-					Flags:    uint32(info.Mode()),
-					Modified: modified,
-					Blocks:   blocks,
-				}
-				*res = append(*res, f)
-			}
-		}
-
-		return nil
-	}
-}
-
-// Walk returns the list of files found in the local repository by scanning the
-// file system. Files are blockwise hashed.
-func (m *Model) Walk(followSymlinks bool) (files []File, ignore map[string][]string) {
-	ignore = make(map[string][]string)
-
-	hashFiles := m.walkAndHashFiles(&files, ignore)
-
-	filepath.Walk(m.dir, m.loadIgnoreFiles(ignore))
-	filepath.Walk(m.dir, hashFiles)
-
-	if followSymlinks {
-		d, err := os.Open(m.dir)
-		if err != nil {
-			return
-		}
-		defer d.Close()
-
-		fis, err := d.Readdir(-1)
-		if err != nil {
-			return
-		}
-
-		for _, info := range fis {
-			if info.Mode()&os.ModeSymlink != 0 {
-				dir := path.Join(m.dir, info.Name()) + "/"
-				filepath.Walk(dir, m.loadIgnoreFiles(ignore))
-				filepath.Walk(dir, hashFiles)
-			}
-		}
-	}
-
-	return
-}
-
-func (m *Model) cleanTempFile(path string, info os.FileInfo, err error) error {
-	if err != nil {
-		return err
-	}
-	if info.Mode()&os.ModeType == 0 && isTempName(path) {
-		if m.trace["file"] {
-			log.Printf("FILE: Remove %q", path)
-		}
-		os.Remove(path)
-	}
-	return nil
-}
-
-func (m *Model) cleanTempFiles() {
-	filepath.Walk(m.dir, m.cleanTempFile)
-}
-
-func ignoreFile(patterns map[string][]string, file string) bool {
-	first, last := path.Split(file)
-	for prefix, pats := range patterns {
-		if len(prefix) == 0 || prefix == first || strings.HasPrefix(first, prefix+"/") {
-			for _, pattern := range pats {
-				if match, _ := path.Match(pattern, last); match {
-					return true
-				}
-			}
-		}
-	}
-	return false
-}