forked from syncthing/syncthing
/
main.go
1375 lines (1160 loc) · 40.2 KB
/
main.go
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// Copyright (C) 2014 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package main
import (
"bytes"
"crypto/tls"
"encoding/json"
"errors"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"net"
"net/http"
"net/url"
"os"
"os/signal"
"path"
"path/filepath"
"regexp"
"runtime"
"runtime/pprof"
"sort"
"strconv"
"strings"
"syscall"
"time"
"github.com/syncthing/syncthing/lib/config"
"github.com/syncthing/syncthing/lib/connections"
"github.com/syncthing/syncthing/lib/db"
"github.com/syncthing/syncthing/lib/dialer"
"github.com/syncthing/syncthing/lib/discover"
"github.com/syncthing/syncthing/lib/events"
"github.com/syncthing/syncthing/lib/fs"
"github.com/syncthing/syncthing/lib/logger"
"github.com/syncthing/syncthing/lib/model"
"github.com/syncthing/syncthing/lib/osutil"
"github.com/syncthing/syncthing/lib/protocol"
"github.com/syncthing/syncthing/lib/rand"
"github.com/syncthing/syncthing/lib/sha256"
"github.com/syncthing/syncthing/lib/tlsutil"
"github.com/syncthing/syncthing/lib/upgrade"
"github.com/thejerf/suture"
_ "net/http/pprof" // Need to import this to support STPROFILER.
)
var (
Version = "unknown-dev"
Codename = "Dysprosium Dragonfly"
BuildStamp = "0"
BuildDate time.Time
BuildHost = "unknown"
BuildUser = "unknown"
IsRelease bool
IsCandidate bool
IsBeta bool
LongVersion string
BuildTags []string
allowedVersionExp = regexp.MustCompile(`^v\d+\.\d+\.\d+(-[a-z0-9]+)*(\.\d+)*(\+\d+-g[0-9a-f]+)?(-[^\s]+)?$`)
)
const (
exitSuccess = 0
exitError = 1
exitNoUpgradeAvailable = 2
exitRestarting = 3
exitUpgrading = 4
)
const (
bepProtocolName = "bep/1.0"
tlsDefaultCommonName = "syncthing"
defaultEventTimeout = time.Minute
maxSystemErrors = 5
initialSystemLog = 10
maxSystemLog = 250
)
func init() {
if Version != "unknown-dev" {
// If not a generic dev build, version string should come from git describe
if !allowedVersionExp.MatchString(Version) {
l.Fatalf("Invalid version string %q;\n\tdoes not match regexp %v", Version, allowedVersionExp)
}
}
}
func setBuildMetadata() {
// Check for a clean release build. A release is something like
// "v0.1.2", with an optional suffix of letters and dot separated
// numbers like "-beta3.47". If there's more stuff, like a plus sign and
// a commit hash and so on, then it's not a release. If it has a dash in
// it, it's some sort of beta, release candidate or special build. If it
// has "-rc." in it, like "v0.14.35-rc.42", then it's a candidate build.
//
// So, every build that is not a stable release build has IsBeta = true.
// This is used to enable some extra debugging (the deadlock detector).
//
// Release candidate builds are also "betas" from this point of view and
// will have that debugging enabled. In addition, some features are
// forced for release candidates - auto upgrade, and usage reporting.
exp := regexp.MustCompile(`^v\d+\.\d+\.\d+(-[a-z]+[\d\.]+)?$`)
IsRelease = exp.MatchString(Version)
IsCandidate = strings.Contains(Version, "-rc.")
IsBeta = strings.Contains(Version, "-")
stamp, _ := strconv.Atoi(BuildStamp)
BuildDate = time.Unix(int64(stamp), 0)
date := BuildDate.UTC().Format("2006-01-02 15:04:05 MST")
LongVersion = fmt.Sprintf(`syncthing %s "%s" (%s %s-%s) %s@%s %s`, Version, Codename, runtime.Version(), runtime.GOOS, runtime.GOARCH, BuildUser, BuildHost, date)
if len(BuildTags) > 0 {
LongVersion = fmt.Sprintf("%s [%s]", LongVersion, strings.Join(BuildTags, ", "))
}
}
var (
myID protocol.DeviceID
stop = make(chan int)
lans []*net.IPNet
)
const (
usage = "syncthing [options]"
extraUsage = `
The -logflags value is a sum of the following:
1 Date
2 Time
4 Microsecond time
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).
Development Settings
--------------------
The following environment variables modify Syncthing's behavior in ways that
are mostly useful for developers. Use with care.
STNODEFAULTFOLDER Don't create a default folder when starting for the first
time. This variable will be ignored anytime after the first
run.
STGUIASSETS Directory to load GUI assets from. Overrides compiled in
assets.
STTRACE A comma separated string of facilities to trace. The valid
facility strings listed below.
STPROFILER Set to a listen address such as "127.0.0.1:9090" to start
the profiler with HTTP access.
STCPUPROFILE Write a CPU profile to cpu-$pid.pprof on exit.
STHEAPPROFILE Write heap profiles to heap-$pid-$timestamp.pprof each time
heap usage increases.
STBLOCKPROFILE Write block profiles to block-$pid-$timestamp.pprof every 20
seconds.
STPERFSTATS Write running performance statistics to perf-$pid.csv. Not
supported on Windows.
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.
STNORESTART Equivalent to the -no-restart argument. Disable the
Syncthing monitor process which handles restarts for some
configuration changes, upgrades, crashes and also log file
writing (stdout is still written).
STNOUPGRADE Disable automatic upgrades.
STHASHING Select the SHA256 hashing package to use. Possible values
are "standard" for the Go standard library implementation,
"minio" for the github.com/minio/sha256-simd implementation,
and blank (the default) for auto detection.
STRECHECKDBEVERY Set to a time interval to override the default database
check interval of 30 days (720h). The interval understands
"h", "m" and "s" abbreviations for hours minutes and seconds.
Valid values are like "720h", "30s", etc.
GOMAXPROCS Set the maximum number of CPU cores to use. Defaults to all
available CPU cores.
GOGC Percentage of heap growth at which to trigger GC. Default is
100. Lower numbers keep peak memory usage down, at the price
of CPU usage (i.e. performance).
Debugging Facilities
--------------------
The following are valid values for the STTRACE variable:
%s`
)
// Environment options
var (
noUpgradeFromEnv = os.Getenv("STNOUPGRADE") != ""
innerProcess = os.Getenv("STNORESTART") != "" || os.Getenv("STMONITORED") != ""
noDefaultFolder = os.Getenv("STNODEFAULTFOLDER") != ""
)
type RuntimeOptions struct {
confDir string
resetDatabase bool
resetDeltaIdxs bool
showVersion bool
showPaths bool
showDeviceId bool
doUpgrade bool
doUpgradeCheck bool
upgradeTo string
noBrowser bool
browserOnly bool
hideConsole bool
logFile string
auditEnabled bool
auditFile string
verbose bool
paused bool
unpaused bool
guiAddress string
guiAPIKey string
generateDir string
noRestart bool
profiler string
assetDir string
cpuProfile bool
stRestarting bool
logFlags int
showHelp bool
downgradeConfig bool
}
func defaultRuntimeOptions() RuntimeOptions {
options := RuntimeOptions{
noRestart: os.Getenv("STNORESTART") != "",
profiler: os.Getenv("STPROFILER"),
assetDir: os.Getenv("STGUIASSETS"),
cpuProfile: os.Getenv("STCPUPROFILE") != "",
stRestarting: os.Getenv("STRESTART") != "",
logFlags: log.Ltime,
}
if os.Getenv("STTRACE") != "" {
options.logFlags = logger.DebugFlags
}
if runtime.GOOS != "windows" {
// On non-Windows, we explicitly default to "-" which means stdout. On
// Windows, the blank options.logFile will later be replaced with the
// default path, unless the user has manually specified "-" or
// something else.
options.logFile = "-"
}
return options
}
func parseCommandLineOptions() RuntimeOptions {
options := defaultRuntimeOptions()
flag.StringVar(&options.generateDir, "generate", "", "Generate key and config in specified dir, then exit")
flag.StringVar(&options.guiAddress, "gui-address", options.guiAddress, "Override GUI address (e.g. \"http://192.0.2.42:8443\")")
flag.StringVar(&options.guiAPIKey, "gui-apikey", options.guiAPIKey, "Override GUI API key")
flag.StringVar(&options.confDir, "home", "", "Set configuration directory")
flag.IntVar(&options.logFlags, "logflags", options.logFlags, "Select information in log line prefix (see below)")
flag.BoolVar(&options.noBrowser, "no-browser", false, "Do not start browser")
flag.BoolVar(&options.browserOnly, "browser-only", false, "Open GUI in browser")
flag.BoolVar(&options.noRestart, "no-restart", options.noRestart, "Disable monitor process, managed restarts and log file writing")
flag.BoolVar(&options.resetDatabase, "reset-database", false, "Reset the database, forcing a full rescan and resync")
flag.BoolVar(&options.resetDeltaIdxs, "reset-deltas", false, "Reset delta index IDs, forcing a full index exchange")
flag.BoolVar(&options.doUpgrade, "upgrade", false, "Perform upgrade")
flag.BoolVar(&options.doUpgradeCheck, "upgrade-check", false, "Check for available upgrade")
flag.BoolVar(&options.showVersion, "version", false, "Show version")
flag.BoolVar(&options.showHelp, "help", false, "Show this help")
flag.BoolVar(&options.showPaths, "paths", false, "Show configuration paths")
flag.BoolVar(&options.showDeviceId, "device-id", false, "Show the device ID")
flag.StringVar(&options.upgradeTo, "upgrade-to", options.upgradeTo, "Force upgrade directly from specified URL")
flag.BoolVar(&options.auditEnabled, "audit", false, "Write events to audit file")
flag.BoolVar(&options.verbose, "verbose", false, "Print verbose log output")
flag.BoolVar(&options.paused, "paused", false, "Start with all devices and folders paused")
flag.BoolVar(&options.unpaused, "unpaused", false, "Start with all devices and folders unpaused")
flag.StringVar(&options.logFile, "logfile", options.logFile, "Log file name (still always logs to stdout). Cannot be used together with -no-restart/STNORESTART environment variable.")
flag.StringVar(&options.auditFile, "auditfile", options.auditFile, "Specify audit file (use \"-\" for stdout, \"--\" for stderr)")
flag.BoolVar(&options.downgradeConfig, "downgradeConfig", false, "Downgrade configuration to current Syncthing configuration version")
if runtime.GOOS == "windows" {
// Allow user to hide the console window
flag.BoolVar(&options.hideConsole, "no-console", false, "Hide console window")
}
longUsage := fmt.Sprintf(extraUsage, debugFacilities())
flag.Usage = usageFor(flag.CommandLine, usage, longUsage)
flag.Parse()
if len(flag.Args()) > 0 {
flag.Usage()
os.Exit(2)
}
return options
}
func main() {
setBuildMetadata()
options := parseCommandLineOptions()
l.SetFlags(options.logFlags)
if options.guiAddress != "" {
// The config picks this up from the environment.
os.Setenv("STGUIADDRESS", options.guiAddress)
}
if options.guiAPIKey != "" {
// The config picks this up from the environment.
os.Setenv("STGUIAPIKEY", options.guiAPIKey)
}
// Check for options which are not compatible with each other. We have
// to check logfile before it's set to the default below - we only want
// to complain if they set -logfile explicitly, not if it's set to its
// default location
if options.noRestart && (options.logFile != "" && options.logFile != "-") {
l.Fatalln("-logfile may not be used with -no-restart or STNORESTART")
}
if options.hideConsole {
osutil.HideConsole()
}
if options.confDir != "" {
// Not set as default above because the string can be really long.
if !filepath.IsAbs(options.confDir) {
var err error
options.confDir, err = filepath.Abs(options.confDir)
if err != nil {
l.Fatalln(err)
}
}
baseDirs["config"] = options.confDir
}
if err := expandLocations(); err != nil {
l.Fatalln(err)
}
if options.logFile == "" {
// Blank means use the default logfile location. We must set this
// *after* expandLocations above.
options.logFile = locations[locLogFile]
}
if options.assetDir == "" {
// The asset dir is blank if STGUIASSETS wasn't set, in which case we
// should look for extra assets in the default place.
options.assetDir = locations[locGUIAssets]
}
if options.showVersion {
fmt.Println(LongVersion)
return
}
if options.showHelp {
flag.Usage()
return
}
if options.showPaths {
showPaths(options)
return
}
if options.showDeviceId {
cert, err := tls.LoadX509KeyPair(locations[locCertFile], locations[locKeyFile])
if err != nil {
l.Fatalln("Error reading device ID:", err)
}
myID = protocol.NewDeviceID(cert.Certificate[0])
fmt.Println(myID)
return
}
if options.browserOnly {
openGUI()
return
}
if options.generateDir != "" {
generate(options.generateDir)
return
}
// Ensure that our home directory exists.
ensureDir(baseDirs["config"], 0700)
if options.upgradeTo != "" {
err := upgrade.ToURL(options.upgradeTo)
if err != nil {
l.Fatalln("Upgrade:", err) // exits 1
}
l.Infoln("Upgraded from", options.upgradeTo)
return
}
if options.doUpgradeCheck {
checkUpgrade()
return
}
if options.doUpgrade {
release := checkUpgrade()
performUpgrade(release)
return
}
if options.resetDatabase {
resetDB()
return
}
if innerProcess || options.noRestart {
syncthingMain(options)
} else {
monitorMain(options)
}
}
func openGUI() {
cfg, _ := loadOrDefaultConfig()
if cfg.GUI().Enabled {
openURL(cfg.GUI().URL())
} else {
l.Warnln("Browser: GUI is currently disabled")
}
}
func generate(generateDir string) {
dir, err := fs.ExpandTilde(generateDir)
if err != nil {
l.Fatalln("generate:", err)
}
ensureDir(dir, 0700)
certFile, keyFile := filepath.Join(dir, "cert.pem"), filepath.Join(dir, "key.pem")
cert, err := tls.LoadX509KeyPair(certFile, keyFile)
if err == nil {
l.Warnln("Key exists; will not overwrite.")
l.Infoln("Device ID:", protocol.NewDeviceID(cert.Certificate[0]))
} else {
cert, err = tlsutil.NewCertificate(certFile, keyFile, tlsDefaultCommonName)
if err != nil {
l.Fatalln("Create certificate:", err)
}
myID = protocol.NewDeviceID(cert.Certificate[0])
if err != nil {
l.Fatalln("Load certificate:", err)
}
if err == nil {
l.Infoln("Device ID:", protocol.NewDeviceID(cert.Certificate[0]))
}
}
cfgFile := filepath.Join(dir, "config.xml")
if _, err := os.Stat(cfgFile); err == nil {
l.Warnln("Config exists; will not overwrite.")
return
}
var cfg = defaultConfig(cfgFile)
err = cfg.Save()
if err != nil {
l.Warnln("Failed to save config", err)
}
}
func debugFacilities() string {
facilities := l.Facilities()
// Get a sorted list of names
var names []string
maxLen := 0
for name := range facilities {
names = append(names, name)
if len(name) > maxLen {
maxLen = len(name)
}
}
sort.Strings(names)
// Format the choices
b := new(bytes.Buffer)
for _, name := range names {
fmt.Fprintf(b, " %-*s - %s\n", maxLen, name, facilities[name])
}
return b.String()
}
func checkUpgrade() upgrade.Release {
cfg, _ := loadOrDefaultConfig()
opts := cfg.Options()
release, err := upgrade.LatestRelease(opts.ReleasesURL, Version, opts.UpgradeToPreReleases)
if err != nil {
l.Fatalln("Upgrade:", err)
}
if upgrade.CompareVersions(release.Tag, Version) <= 0 {
noUpgradeMessage := "No upgrade available (current %q >= latest %q)."
l.Infof(noUpgradeMessage, Version, release.Tag)
os.Exit(exitNoUpgradeAvailable)
}
l.Infof("Upgrade available (current %q < latest %q)", Version, release.Tag)
return release
}
func performUpgrade(release upgrade.Release) {
// Use leveldb database locks to protect against concurrent upgrades
_, err := db.Open(locations[locDatabase])
if err == nil {
err = upgrade.To(release)
if err != nil {
l.Fatalln("Upgrade:", err)
}
l.Infof("Upgraded to %q", release.Tag)
} else {
l.Infoln("Attempting upgrade through running Syncthing...")
err = upgradeViaRest()
if err != nil {
l.Fatalln("Upgrade:", err)
}
l.Infoln("Syncthing upgrading")
os.Exit(exitUpgrading)
}
}
func upgradeViaRest() error {
cfg, _ := loadOrDefaultConfig()
u, err := url.Parse(cfg.GUI().URL())
if err != nil {
return err
}
u.Path = path.Join(u.Path, "rest/system/upgrade")
target := u.String()
r, _ := http.NewRequest("POST", target, nil)
r.Header.Set("X-API-Key", cfg.GUI().APIKey)
tr := &http.Transport{
Dial: dialer.Dial,
Proxy: http.ProxyFromEnvironment,
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
client := &http.Client{
Transport: tr,
Timeout: 60 * time.Second,
}
resp, err := client.Do(r)
if err != nil {
return err
}
if resp.StatusCode != 200 {
bs, err := ioutil.ReadAll(resp.Body)
defer resp.Body.Close()
if err != nil {
return err
}
return errors.New(string(bs))
}
return err
}
func syncthingMain(runtimeOptions RuntimeOptions) {
setupSignalHandling()
// Create a main service manager. We'll add things to this as we go along.
// We want any logging it does to go through our log system.
mainService := suture.New("main", suture.Spec{
Log: func(line string) {
l.Debugln(line)
},
PassThroughPanics: true,
})
mainService.ServeBackground()
// Set a log prefix similar to the ID we will have later on, or early log
// lines look ugly.
l.SetPrefix("[start] ")
if runtimeOptions.auditEnabled {
startAuditing(mainService, runtimeOptions.auditFile)
}
if runtimeOptions.verbose {
mainService.Add(newVerboseService())
}
errors := logger.NewRecorder(l, logger.LevelWarn, maxSystemErrors, 0)
systemLog := logger.NewRecorder(l, logger.LevelDebug, maxSystemLog, initialSystemLog)
// Event subscription for the API; must start early to catch the early
// events. The LocalChangeDetected event might overwhelm the event
// receiver in some situations so we will not subscribe to it here.
defaultSub := events.NewBufferedSubscription(events.Default.Subscribe(defaultEventMask), eventSubBufferSize)
diskSub := events.NewBufferedSubscription(events.Default.Subscribe(diskEventMask), eventSubBufferSize)
if len(os.Getenv("GOMAXPROCS")) == 0 {
runtime.GOMAXPROCS(runtime.NumCPU())
}
// Attempt to increase the limit on number of open files to the maximum
// allowed, in case we have many peers. We don't really care enough to
// report the error if there is one.
osutil.MaximizeOpenFileLimit()
// Ensure that we have a certificate and key.
cert, err := tls.LoadX509KeyPair(locations[locCertFile], locations[locKeyFile])
if err != nil {
l.Infof("Generating ECDSA key and certificate for %s...", tlsDefaultCommonName)
cert, err = tlsutil.NewCertificate(locations[locCertFile], locations[locKeyFile], tlsDefaultCommonName)
if err != nil {
l.Fatalln(err)
}
}
myID = protocol.NewDeviceID(cert.Certificate[0])
l.SetPrefix(fmt.Sprintf("[%s] ", myID.String()[:5]))
l.Infoln(LongVersion)
l.Infoln("My ID:", myID)
// Select SHA256 implementation and report. Affected by the
// STHASHING environment variable.
sha256.SelectAlgo()
sha256.Report()
// Emit the Starting event, now that we know who we are.
events.Default.Log(events.Starting, map[string]string{
"home": baseDirs["config"],
"myID": myID.String(),
})
cfg := loadConfigAtStartup(runtimeOptions.downgradeConfig)
if err := checkShortIDs(cfg); err != nil {
l.Fatalln("Short device IDs are in conflict. Unlucky!\n Regenerate the device ID of one of the following:\n ", err)
}
if len(runtimeOptions.profiler) > 0 {
go func() {
l.Debugln("Starting profiler on", runtimeOptions.profiler)
runtime.SetBlockProfileRate(1)
err := http.ListenAndServe(runtimeOptions.profiler, nil)
if err != nil {
l.Fatalln(err)
}
}()
}
perf := cpuBench(3, 150*time.Millisecond, true)
l.Infof("Hashing performance is %.02f MB/s", perf)
dbFile := locations[locDatabase]
ldb, err := db.Open(dbFile)
if err != nil {
l.Fatalln("Error opening database:", err)
}
if err := db.UpdateSchema(ldb); err != nil {
l.Fatalln("Database schema:", err)
}
if runtimeOptions.resetDeltaIdxs {
l.Infoln("Reinitializing delta index IDs")
db.DropDeltaIndexIDs(ldb)
}
protectedFiles := []string{
locations[locDatabase],
locations[locConfigFile],
locations[locCertFile],
locations[locKeyFile],
}
// Remove database entries for folders that no longer exist in the config
folders := cfg.Folders()
for _, folder := range ldb.ListFolders() {
if _, ok := folders[folder]; !ok {
l.Infof("Cleaning data for dropped folder %q", folder)
db.DropFolder(ldb, folder)
}
}
// Grab the previously running version string from the database.
miscDB := db.NewMiscDataNamespace(ldb)
prevVersion, _ := miscDB.String("prevVersion")
// Strip away prerelease/beta stuff and just compare the release
// numbers. 0.14.44 to 0.14.45-banana is an upgrade, 0.14.45-banana to
// 0.14.45-pineapple is not.
prevParts := strings.Split(prevVersion, "-")
curParts := strings.Split(Version, "-")
if prevParts[0] != curParts[0] {
if prevVersion != "" {
// Check Syncthing version
checkRelation := upgrade.CompareVersions(curParts[0], prevParts[0])
if checkRelation == upgrade.Older || checkRelation == upgrade.MajorOlder {
l.Warnf("Downgrade detected: %s to %s", prevVersion, Version)
} else {
l.Infoln("Detected upgrade from", prevVersion, "to", Version)
}
}
// Drop delta indexes in case we've changed random stuff we
// shouldn't have. We will resend our index on next connect.
db.DropDeltaIndexIDs(ldb)
// Remember the new version.
miscDB.PutString("prevVersion", Version)
}
m := model.NewModel(cfg, myID, "syncthing", Version, ldb, protectedFiles)
if t := os.Getenv("STDEADLOCKTIMEOUT"); t != "" {
if secs, _ := strconv.Atoi(t); secs > 0 {
m.StartDeadlockDetector(time.Duration(secs) * time.Second)
}
} else if !IsRelease || IsBeta {
m.StartDeadlockDetector(20 * time.Minute)
}
if runtimeOptions.unpaused {
setPauseState(cfg, false)
} else if runtimeOptions.paused {
setPauseState(cfg, true)
}
// Add and start folders
for _, folderCfg := range cfg.Folders() {
if folderCfg.Paused {
folderCfg.CreateRoot()
continue
}
m.AddFolder(folderCfg)
m.StartFolder(folderCfg.ID)
}
mainService.Add(m)
// Start discovery
cachedDiscovery := discover.NewCachingMux()
mainService.Add(cachedDiscovery)
// The TLS configuration is used for both the listening socket and outgoing
// connections.
tlsCfg := tlsutil.SecureDefault()
tlsCfg.Certificates = []tls.Certificate{cert}
tlsCfg.NextProtos = []string{bepProtocolName}
tlsCfg.ClientAuth = tls.RequestClientCert
tlsCfg.SessionTicketsDisabled = true
tlsCfg.InsecureSkipVerify = true
// Start connection management
connectionsService := connections.NewService(cfg, myID, m, tlsCfg, cachedDiscovery, bepProtocolName, tlsDefaultCommonName)
mainService.Add(connectionsService)
if cfg.Options().GlobalAnnEnabled {
for _, srv := range cfg.GlobalDiscoveryServers() {
l.Infoln("Using discovery server", srv)
gd, err := discover.NewGlobal(srv, cert, connectionsService)
if err != nil {
l.Warnln("Global discovery:", err)
continue
}
// Each global discovery server gets its results cached for five
// minutes, and is not asked again for a minute when it's returned
// unsuccessfully.
cachedDiscovery.Add(gd, 5*time.Minute, time.Minute)
}
}
if cfg.Options().LocalAnnEnabled {
// v4 broadcasts
bcd, err := discover.NewLocal(myID, fmt.Sprintf(":%d", cfg.Options().LocalAnnPort), connectionsService)
if err != nil {
l.Warnln("IPv4 local discovery:", err)
} else {
cachedDiscovery.Add(bcd, 0, 0)
}
// v6 multicasts
mcd, err := discover.NewLocal(myID, cfg.Options().LocalAnnMCAddr, connectionsService)
if err != nil {
l.Warnln("IPv6 local discovery:", err)
} else {
cachedDiscovery.Add(mcd, 0, 0)
}
}
// GUI
setupGUI(mainService, cfg, m, defaultSub, diskSub, cachedDiscovery, connectionsService, errors, systemLog, runtimeOptions)
if runtimeOptions.cpuProfile {
f, err := os.Create(fmt.Sprintf("cpu-%d.pprof", os.Getpid()))
if err != nil {
log.Fatal(err)
}
pprof.StartCPUProfile(f)
}
for _, device := range cfg.Devices() {
if len(device.Name) > 0 {
l.Infof("Device %s is %q at %v", device.DeviceID, device.Name, device.Addresses)
}
}
// Candidate builds always run with usage reporting.
if opts := cfg.Options(); IsCandidate {
l.Infoln("Anonymous usage reporting is always enabled for candidate releases.")
opts.URAccepted = usageReportVersion
cfg.SetOptions(opts)
cfg.Save()
// Unique ID will be set and config saved below if necessary.
}
if opts := cfg.Options(); opts.URUniqueID == "" {
opts.URUniqueID = rand.String(8)
cfg.SetOptions(opts)
cfg.Save()
}
usageReportingSvc := newUsageReportingService(cfg, m, connectionsService)
mainService.Add(usageReportingSvc)
if opts := cfg.Options(); opts.RestartOnWakeup {
go standbyMonitor()
}
// Candidate builds should auto upgrade. Make sure the option is set,
// unless we are in a build where it's disabled or the STNOUPGRADE
// environment variable is set.
if IsCandidate && !upgrade.DisabledByCompilation && !noUpgradeFromEnv {
l.Infoln("Automatic upgrade is always enabled for candidate releases.")
if opts := cfg.Options(); opts.AutoUpgradeIntervalH == 0 || opts.AutoUpgradeIntervalH > 24 {
opts.AutoUpgradeIntervalH = 12
// Set the option into the config as well, as the auto upgrade
// loop expects to read a valid interval from there.
cfg.SetOptions(opts)
cfg.Save()
}
// We don't tweak the user's choice of upgrading to pre-releases or
// not, as otherwise they cannot step off the candidate channel.
}
if opts := cfg.Options(); opts.AutoUpgradeIntervalH > 0 {
if noUpgradeFromEnv {
l.Infof("No automatic upgrades; STNOUPGRADE environment variable defined.")
} else {
go autoUpgrade(cfg)
}
}
if isSuperUser() {
l.Warnln("Syncthing should not run as a privileged or system user. Please consider using a normal user account.")
}
events.Default.Log(events.StartupComplete, map[string]string{
"myID": myID.String(),
})
cleanConfigDirectory()
if cfg.Options().SetLowPriority {
if err := osutil.SetLowPriority(); err != nil {
l.Warnln("Failed to lower process priority:", err)
}
}
code := <-stop
mainService.Stop()
l.Infoln("Exiting")
if runtimeOptions.cpuProfile {
pprof.StopCPUProfile()
}
os.Exit(code)
}
func setupSignalHandling() {
// Exit cleanly with "restarting" code on SIGHUP.
restartSign := make(chan os.Signal, 1)
sigHup := syscall.Signal(1)
signal.Notify(restartSign, sigHup)
go func() {
<-restartSign
stop <- exitRestarting
}()
// Exit with "success" code (no restart) on INT/TERM
stopSign := make(chan os.Signal, 1)
sigTerm := syscall.Signal(15)
signal.Notify(stopSign, os.Interrupt, sigTerm)
go func() {
<-stopSign
stop <- exitSuccess
}()
}
func loadOrDefaultConfig() (*config.Wrapper, error) {
cfgFile := locations[locConfigFile]
cfg, err := config.Load(cfgFile, myID)
if err != nil {
cfg = defaultConfig(cfgFile)
}
return cfg, err
}
func loadConfigAtStartup(allowDowngrade bool) *config.Wrapper {
cfgFile := locations[locConfigFile]
cfg, err := config.Load(cfgFile, myID)
if os.IsNotExist(err) {
cfg = defaultConfig(cfgFile)
cfg.Save()
l.Infof("Default config saved. Edit %s to taste or use the GUI\n", cfg.ConfigPath())
} else if err == io.EOF {
l.Fatalln("Failed to load config: unexpected end of file. Truncated or empty configuration?")
} else if err != nil {
l.Fatalln("Failed to load config:", err)
}
configVersion := cfg.RawCopy().OriginalVersion
if configVersion != config.CurrentVersion {
// Check config version
if cfg.RawCopy().OriginalVersion > config.CurrentVersion {
// Config version is not compatible with installed version
if !allowDowngrade {
if findOldConfig(cfg) {
archivePath := cfg.ConfigPath() + fmt.Sprintf(".v%d", config.CurrentVersion)
l.Infof("Compatible version of config was found in path %s, can be used manually.", archivePath)
}
l.Infof("Use `-downgradeConfig' flag to downgrade your config.")
l.Fatalf("Current Configuration Version: %d, Loading Configuration Version: %d (Configuration Version Mismatch)", configVersion, config.CurrentVersion)
} else {
l.Infof("Current Configuration Version: %d, Loading Configuration Version: %d (Configuration Version Mismatch)", configVersion, config.CurrentVersion)
err = archiveAndSaveConfig(cfg)
if err != nil {
l.Fatalln("Config archive:", err)
}
cfgXML := cfg.RawCopy()
// Read configuration second time, Unmarshal to configuration struct and Change Version
var cfgConfig config.Configuration
var buf bytes.Buffer
err = json.NewEncoder(&buf).Encode(cfgXML)
if err != nil {
l.Fatalln("Config didn't downgrade: ", err)
}
cfgConfig, err = config.ReadJSON(&buf, myID)
if err != nil {