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shell.go
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package main
import (
"fmt"
"io"
"net"
"os"
"os/signal"
"path"
"strings"
"sync"
"syscall"
"time"
"github.com/jessevdk/go-flags"
"github.com/mitchellh/go-homedir"
log "github.com/tillberg/alog"
"github.com/tillberg/autorestart"
"github.com/tillberg/bismuth"
)
var OptsCommon struct {
Verbose bool `short:"v" long:"verbose" description:"Show verbose debug information"`
Version bool `long:"version" description:"Print gut-sync version"`
NoColor bool `long:"no-color" description:"Disable ANSI colors"`
}
var OptsSync struct {
IdentityFile string `short:"i" long:"identity"`
Positional struct {
LocalPath string
} `positional-args:"yes" required:"yes"`
}
type FileEvent struct {
ctx *SyncContext
filepath string
}
const shutdownChanLen = 20
var shutdownChan = make(chan bool, shutdownChanLen)
func IsShuttingDown() bool {
select {
case <-shutdownChan:
return true
default:
return false
}
}
const commitDebounceDuration = 100 * time.Millisecond
const reconnectMinDelay = 2 * time.Second
func (ctx *SyncContext) StartReverseTunnel(srcAddr string, destAddr string) (reconnectChan chan bool, err error) {
isFirstTime := true
firstTimeChan := make(chan error)
go func() {
logger := ctx.Logger()
lastConnectStartTime := time.Now()
for {
listener, tunnelErrChan, err := ctx.ReverseTunnel(srcAddr, destAddr)
if isFirstTime {
firstTimeChan <- err
isFirstTime = false
} else {
reconnectChan <- true
}
if err == nil {
err = <-tunnelErrChan
}
if IsShuttingDown() {
logger.Printf("@(dim)Reverse tunnel exiting (shutting down).@(r)\n")
return
}
if err == io.EOF {
logger.Printf("@(error:Connection lost.)\n")
} else {
logger.Printf("@(error:Encountered error on reverse-tunnel: %v)\n", err)
}
if listener != nil {
listener.Close() // Ignore any errors; it might already be closed.
}
reconnectLogger := ctx.NewLogger("")
reconnectStart := time.Now()
elapsedSeconds := func() int {
return int(time.Since(reconnectStart).Seconds())
}
for {
reconnectLogger.Replacef("@(dim)Reconnecting (%ds)...@(r)", elapsedSeconds())
// Rate-limit calls to Connect. The delay should be zero on timeout errors, assuming that the
// network timeout in bismuth is greater than reconnectMinDelay.
time.Sleep(reconnectMinDelay - time.Since(lastConnectStartTime))
lastConnectStartTime = time.Now()
err = ctx.Connect()
if err != nil {
squelch := false
netErr, ok := err.(net.Error)
if ok && netErr.Timeout() {
squelch = true
}
errStr := err.Error()
if strings.Contains(errStr, "no route to host") {
squelch = true
}
if strings.Contains(errStr, "connection refused") {
squelch = true
}
if !squelch {
logger.Printf("@(dim:Error while reconnecting: %v)\n", err)
}
} else {
reconnectLogger.Replacef("@(dim:Connection re-established after %d seconds.)\n", elapsedSeconds())
break
}
}
reconnectLogger.Close()
}
}()
reconnectChan = make(chan bool)
err = <-firstTimeChan
return reconnectChan, err
}
const reconnectBufferLength = 2
const eventBufferLength = 100
const forceFullSyncCheckString = "**force full sync check**"
func Sync(local *SyncContext, remotes []*SyncContext) (err error) {
status := local.NewLogger("sync")
defer status.Close()
allContexts := append([]*SyncContext{local}, remotes...)
hostsStrs := []string{}
for _, ctx := range allContexts {
hostsStrs = append(hostsStrs, ctx.SyncPathAnsi())
}
hostsStr := JoinWithAndAndCommas(hostsStrs...)
status.Printf("@(dim:Starting gut-sync between) %s@(dim:.)\n", hostsStr)
for _, ctx := range allContexts {
_, err = EnsureBuild(local, ctx)
if err != nil {
status.Bail(err)
}
}
ports, err := FindOpenPorts(1, allContexts...)
if err != nil {
status.Bail(err)
}
// status.Printf("Using ports %v\n", ports)
gutdPort := ports[0]
gutdAddr := fmt.Sprintf("localhost:%d", gutdPort)
repoName := RandSeq(8) + local.getPidfileScope()
eventChan := make(chan FileEvent, eventBufferLength)
// Start up gut-daemon on the local host, and create a reverse tunnel from each of the remote hosts
// back to the local gut-tdaemon. All hosts can connect to gut-daemon at localhost:<gutdPort>, which
// makes configuration a little simpler.
ready := make(chan bool)
numTasks := 0
goTask := func(taskCtx *SyncContext, fn func(*SyncContext)) {
numTasks++
go func() {
fn(taskCtx)
ready <- true
}()
}
joinTasks := func() {
for numTasks > 0 {
<-ready
numTasks--
}
}
if len(remotes) > 0 {
goTask(local, func(taskCtx *SyncContext) {
err := taskCtx.GutDaemon(repoName, gutdPort)
if err != nil {
status.Bail(err)
}
})
}
for _, ctx := range remotes {
if !ctx.IsLocal() {
goTask(ctx, func(taskCtx *SyncContext) {
reconnectChan, err := taskCtx.StartReverseTunnel(gutdAddr, gutdAddr)
if err != nil {
status.Bail(err)
}
go func() {
for {
<-reconnectChan
eventChan <- FileEvent{taskCtx, forceFullSyncCheckString}
}
}()
})
}
}
joinTasks()
// Fetch the tail hash for all contexts in parallel
for _, ctx := range allContexts {
goTask(ctx, func(taskCtx *SyncContext) {
taskCtx.UpdateTailHash()
})
}
joinTasks()
// Iterate over the contexts, finding the common tailHash, if any. Bail if there are conflicting tailHashes.
tailHash := ""
var tailHashFoundOn *SyncContext
localTailHash := local.GetTailHash()
if localTailHash != "" {
tailHash = localTailHash
tailHashFoundOn = local
}
contextsNeedInit := []*SyncContext{}
for _, ctx := range remotes {
myTailHash := ctx.GetTailHash()
if myTailHash == "" {
err = ctx.AssertSyncFolderIsEmpty()
if err != nil {
status.Bail(err)
}
contextsNeedInit = append(contextsNeedInit, ctx)
} else {
if tailHash == "" {
tailHash = myTailHash
tailHashFoundOn = ctx
} else {
if tailHash != myTailHash {
status.Printf("@(error:Found different gut repo base commits:)\n")
status.Printf("@(commit:%s) @(error:at) %s\n",
TrimCommit(tailHash), tailHashFoundOn.SyncPathAnsi())
status.Printf("@(commit:%s) @(error:at) %s\n",
TrimCommit(myTailHash), ctx.SyncPathAnsi())
Shutdown(status.Colorify("@(error:Cannot sync incompatible gut repos.)"), 1)
}
goTask(ctx, func(taskCtx *SyncContext) {
err := taskCtx.GutSetupOrigin(repoName, gutdPort)
if err != nil {
status.Bail(err)
}
})
}
}
}
// If local needs to be initialized, do so, either from scratch or by bootstrapping from tailHashFoundOn.
if localTailHash == "" {
if tailHash == "" {
status.Printf("@(dim:No existing gut repo found. Initializing gut repo in %s.)\n", local.SyncPathAnsi())
err = local.GutInit()
if err != nil {
status.Bail(err)
}
err = local.GutSetupOrigin(repoName, gutdPort)
if err != nil {
status.Bail(err)
}
err = local.GutEnsureInitialCommit()
if err != nil {
status.Bail(err)
}
local.UpdateTailHash()
tailHash = local.GetTailHash()
if tailHash == "" {
Shutdown(status.Colorify("Failed to initialize new gut repo."), 1)
}
tailHashFoundOn = local
} else {
err = local.GutInit()
if err != nil {
status.Bail(err)
}
err = local.GutSetupOrigin(repoName, gutdPort)
if err != nil {
status.Bail(err)
}
joinTasks() // Wait for GutSetupOrigin on tailHashFoundOn to finish
err = tailHashFoundOn.GutPush()
if err != nil {
status.Bail(err)
}
err = local.GutCheckoutAsMaster(tailHashFoundOn.BranchName())
if err != nil {
status.Bail(err)
}
}
} else {
goTask(local, func(taskCtx *SyncContext) {
err := taskCtx.GutSetupOrigin(repoName, gutdPort)
if err != nil {
status.Bail(err)
}
})
}
// Bootstrap any non-local contexts that need it:
for _, ctx := range contextsNeedInit {
goTask(ctx, func(taskCtx *SyncContext) {
err := taskCtx.GutInit()
if err != nil {
status.Bail(err)
}
err = taskCtx.GutSetupOrigin(repoName, gutdPort)
if err != nil {
status.Bail(err)
}
err = taskCtx.GutPull()
if err != nil {
status.Bail(err)
}
})
}
joinTasks()
commitScoped := func(src *SyncContext, changedPaths []string, updateUntracked bool) (changed bool, err error) {
prefix := CommonPathPrefix(changedPaths...)
if prefix != "" {
// git is annoying if you try to git-add git-ignored files (printing a message that is very helpful when there is a human
// attached to stdin/stderr), so let's always just target the last *folder* by lopping off everything after the last slash:
lastIndex := strings.LastIndex(prefix, "/")
if lastIndex == -1 {
prefix = ""
} else {
prefix = prefix[:lastIndex+1]
}
}
if prefix == "" {
prefix = "."
}
changed, err = src.GutCommit(prefix, updateUntracked)
if err != nil {
return false, err
}
return changed, nil
}
// Start up an instance of fswatch/inotifywait for each context to watch for file changes
for _, ctx := range allContexts {
goTask(ctx, func(taskCtx *SyncContext) {
taskCtx.WatchForChanges(func(filepath string) {
eventChan <- FileEvent{taskCtx, filepath}
})
})
}
joinTasks()
var haveChanges bool
var changedPaths map[*SyncContext]map[string]bool
var changedIgnore map[*SyncContext]bool
var forceSyncCheck bool
clearChanges := func() {
haveChanges = false
changedPaths = make(map[*SyncContext]map[string]bool)
changedIgnore = make(map[*SyncContext]bool)
forceSyncCheck = false
}
clearChanges()
flushChanges := func() {
// Flush all file changes, in three phases:
// - Commit on all nodes that have seen recent changes
// - Push and merge all changes to the local master
// - Pull changes back out to the remotes.
// First phase, Commit.
// (This is typically just one context, except at startup, when we create a pseudo-change event for each context.)
changedCtxChan := make(chan *SyncContext)
for ctx, pathMap := range changedPaths {
go func(taskCtx *SyncContext, taskPathMap map[string]bool) {
paths := []string{}
for path := range taskPathMap {
paths = append(paths, path)
}
_, changedThisIgnore := changedIgnore[taskCtx]
// log.Printf("Starting commitScoped on %s\n", taskCtx.NameAnsi())
changed, err := commitScoped(taskCtx, paths, changedThisIgnore)
// log.Printf("Finished commitScoped on %s\n", taskCtx.NameAnsi())
if err != nil {
status.Printf("@(error:Commit failed on) %s@(error:: %v)\n", taskCtx.NameAnsi(), err)
changedCtxChan <- nil
} else {
if changed {
changedCtxChan <- taskCtx
} else {
changedCtxChan <- nil
}
}
}(ctx, pathMap)
}
changedCtxs := []*SyncContext{}
for _ = range changedPaths {
ctx := <-changedCtxChan
if ctx != nil {
changedCtxs = append(changedCtxs, ctx)
}
}
if !forceSyncCheck && len(changedCtxs) == 0 {
clearChanges()
return
}
clearChanges()
// Second phase, Push to local.
// XXX if remote has a previous change (i.e. from when it was the local), we don't necessarily pick up that change here.
for _, ctx := range changedCtxs {
if ctx != local {
// log.Printf("Starting GutPush on %s\n", ctx.NameAnsi())
err = ctx.GutPush()
// log.Printf("Finished GutPush on %s\n", ctx.NameAnsi())
if err != nil {
status.Printf("@(error:Failed to push changes from) %s @(error:to local: %v)\n", ctx.NameAnsi(), err)
continue
}
// log.Printf("Starting GutMerge on %s\n", ctx.NameAnsi())
err = local.GutMerge(ctx.BranchName())
// log.Printf("Finished GutMerge on %s\n", ctx.NameAnsi())
if err != nil {
status.Printf("@(error:Failed to merge) %s @(error:into) master@(error:: %v)\n", ctx.BranchName(), err)
}
}
}
masterCommitChan := make(chan string, len(remotes))
go func() {
masterCommit, err := local.GutRevParseHead()
if err != nil {
status.Printf("@(error:Failed to rev-parse head on local: %v)\n", err)
masterCommit = ""
}
for i := 0; i < len(remotes); i++ {
masterCommitChan <- masterCommit
}
}()
// Third phase, Pull to remotes.
done := make(chan error)
for _, ctx := range remotes {
go func(taskCtx *SyncContext) {
if !taskCtx.IsConnected() {
status.Printf("@(dim:Skipping sync to disconnected remote) %s\n", taskCtx.NameAnsi())
done <- nil
return
}
// log.Printf("Starting GutRevParseHead on %s\n", taskCtx.NameAnsi())
myCommit, err := taskCtx.GutRevParseHead()
// log.Printf("Finished GutRevParseHead on %s\n", taskCtx.NameAnsi())
if err != nil {
done <- err
return
}
localMasterCommit := <-masterCommitChan
if localMasterCommit != "" && myCommit != localMasterCommit {
// log.Printf("Starting GutPull on %s\n", taskCtx.NameAnsi())
err = taskCtx.GutPull()
// log.Printf("Finished GutPull on %s\n", taskCtx.NameAnsi())
}
// log.Printf("Finished third phase on %s\n", taskCtx.NameAnsi())
done <- err
}(ctx)
}
for _, ctx := range remotes {
select {
case err = <-done:
if err == NeedsCommitError {
status.Printf("@(dim:Need to commit on) %s @(dim:before it can pull.)\n", ctx.NameAnsi())
go func() {
eventChan <- FileEvent{ctx, forceFullSyncCheckString}
}()
err = nil
}
if err != nil {
status.Printf("@(error:Failed to pull changes to) %s@(error:: %v)\n", ctx.NameAnsi(), err)
}
case <-time.After(60 * time.Second):
status.Printf("@(warn:Timed out while waiting for a remote to finish syncing.)\n")
}
}
}
go func() {
// Note: The filesystem watchers are not necessarily listening to all updates yet, so we could miss file changes that occur between
// the commit_and_update calls below and the time that the filesystem watches are attached.
for _, ctx := range allContexts {
// Queue up an event to force checking for changes.
eventChan <- FileEvent{ctx, forceFullSyncCheckString}
}
}()
// Process messages from eventChan forever. Read as many messages as possible before needing to wait at least
// commitDebounceDuration, at which point we flush all the events (and commit & sync changes, etc).
var event FileEvent
for {
if haveChanges {
select {
case event = <-eventChan:
break
case <-time.After(commitDebounceDuration):
flushChanges()
continue
}
} else {
event = <-eventChan
}
if event.filepath == forceFullSyncCheckString {
// Force an attempt to update all the remotes, even if there are no new commits.
forceSyncCheck = true
// And also force a full commit & update-untracked on this node
changedIgnore[event.ctx] = true
}
parts := strings.Split(event.filepath, "/")
skip := false
for _, part := range parts {
if part == ".gut" {
skip = true
} else if part == ".gutignore" {
changedIgnore[event.ctx] = true
}
}
if skip {
continue
}
// status.Printf("@(dim:[)%s@(dim:] changed on) %s\n", event.filepath, event.ctx.NameAnsi())
haveChanges = true
ctxChanged, ok := changedPaths[event.ctx]
if !ok {
ctxChanged = make(map[string]bool)
changedPaths[event.ctx] = ctxChanged
}
ctxChanged[event.filepath] = true
}
}
var shutdownLock sync.Mutex
func Shutdown(reason string, exitcode int) {
shutdownLock.Lock()
for i := 0; i < shutdownChanLen; i++ {
shutdownChan <- true
}
status := log.New(os.Stderr, "", 0)
if reason != "" {
status.Printf("%s ", reason)
}
status.Printf("Stopping all subprocesses...\n")
done := make(chan bool)
for _, _ctx := range AllSyncContexts {
go func(ctx *SyncContext) {
if ctx.IsConnected() {
ctx.KillAllSessions()
// This generally shouldn't *do* anything other than
// clean up the PID files, as the killing would have
// been done already in KillAllSessions.
ctx.KillAllViaPidfiles()
ctx.Close()
}
done <- true
}(_ctx)
}
for range AllSyncContexts {
select {
case <-done:
case <-time.After(3 * time.Second):
}
}
status.Printf("Exiting.")
os.Stderr.WriteString("\n")
os.Exit(exitcode)
}
func printUsageInfoAndExit() {
status := log.New(os.Stderr, "", 0)
status.Println("")
status.Println("Usage: gut sync [option]... path [{ [user@]host:path | path }]...")
status.Println("")
status.Println("Options:")
status.Println(" --no-color: Disable ANSI colors")
status.Println(" --verbose: Show all commands executed")
status.Println(" --build-deps: Build gut-commands from git source instead of downloading tarball")
status.Println("--build-parallel: Build gut-commands in parallel via make -j {num_cores}")
status.Println("")
status.Println("Examples:")
status.Println(" Sync folder with one remote: gut sync ~/stuff/ [email protected]:~/stuff/")
status.Println(" Sync folder with two remotes: gut sync stuff/ remotehost1.com:~/work/ [email protected]:/tmp/sync")
status.Println(" Sync folders locally: gut sync ~/mywork /mnt/backup/mywork/")
status.Println("Just track changes, no syncing: gut sync ~/mywork")
status.Println("")
os.Exit(0)
}
func main() {
log.EnableColorTemplate()
log.AddAnsiColorCode("error", 31)
log.AddAnsiColorCode("commit", 32)
log.AddAnsiColorCode("path", 36)
var args []string = os.Args[1:]
if len(args) == 0 {
fmt.Println("You must specify a gut-command, e.g. `gut sync ...`")
os.Exit(1)
}
var cmd = args[0]
if IsGitCommand(cmd) {
if IsDangerousGitCommand(cmd) {
if len(args) < 2 || args[1] != "--danger" {
status := log.New(os.Stderr, "", 0)
status.Printf("@(dim:In order to prevent damage caused by accidentally using `)gut %s ...@(dim:`)\n", cmd)
status.Printf("@(dim:in cases where `)git %s ...@(dim:` was intended, you must append `)--danger@(dim:`)\n", cmd)
status.Printf("@(dim:immediately after the command, i.e. `)gut %s --danger ...@(dim:`.)\n", cmd)
status.Printf("@(dim:Alternatively, you could invoke) gut @(dim:directly at) @(path:%s)@(dim:.)\n", GutExePath)
status.Printf("@(dim:The commands that require this flag are:) %s\n", strings.Join(DangerousGitCommands, " "))
os.Exit(1)
}
// Split the "--danger" flag out before handing off the args list to the gut-command:
if len(args) > 2 {
args = append(args[:1], args[2:]...)
} else {
args = args[:1]
}
}
homeDir, err := homedir.Dir()
if err != nil {
log.Bail(err)
}
var gutExe = path.Join(homeDir, GutExePath[2:])
syscall.Exec(gutExe, append([]string{gutExe}, args...), os.Environ())
fmt.Printf("Failed to exec %s", gutExe)
os.Exit(1)
}
autorestart.CleanUpChildZombiesQuietly()
go autorestart.RestartOnChange()
status := log.New(os.Stderr, "", 0)
args = args[1:]
parser := flags.NewParser(&OptsCommon, flags.IgnoreUnknown)
var argsRemaining, err = parser.ParseArgs(args)
if err != nil {
printUsageInfoAndExit()
}
if OptsCommon.NoColor {
log.DisableColor()
}
if OptsCommon.Version {
status.Printf("gut-sync %s\n", GutVersion)
os.Exit(0)
}
bismuth.SetVerbose(OptsCommon.Verbose)
go func() {
sigintChan := make(chan os.Signal, 1)
signal.Notify(sigintChan, os.Interrupt)
<-sigintChan
Shutdown("Received SIGINT.", 1)
}()
go func() {
sighupChan := autorestart.NotifyOnSighup()
<-sighupChan
Shutdown("Received SIGHUP.", 0)
}()
if cmd == "build" {
var local = NewSyncContext()
err := local.Connect()
if err != nil {
status.Bail(err)
}
err = local.CheckLocalDeps()
if err != nil {
status.Bail(err)
}
didSomething, err := EnsureBuild(local, local)
if err != nil {
status.Bail(err)
}
if !didSomething {
status.Printf("@(dim:gut) " + GitVersion + " @(dim:has already been built.)\n")
}
} else if cmd == "sync" {
var remoteArgs, err = flags.ParseArgs(&OptsSync, argsRemaining)
if err != nil {
printUsageInfoAndExit()
}
ready := make(chan error)
local := NewSyncContext()
err = local.ParseSyncPath(OptsSync.Positional.LocalPath)
if err != nil {
status.Bail(err)
}
if len(remoteArgs) > 0 && os.Getenv("SSH_AUTH_SOCK") == "" {
log.Printf("@(error:SSH_AUTH_SOCK is not set in environment. Start up an ssh agent first before running gut-sync.)\n")
Shutdown("", 1)
}
go func() {
err = local.Connect()
if err != nil {
status.Bail(err)
}
err = local.CheckLocalDeps()
if err != nil {
status.Bail(err)
}
local.KillAllViaPidfiles()
local.SaveDaemonPid("gut", os.Getpid())
ready <- nil
}()
remotes := []*SyncContext{}
for _, remotePath := range remoteArgs {
remote := NewSyncContext()
remotes = append(remotes, remote)
err = remote.ParseSyncPath(remotePath)
if err != nil {
status.Bail(err)
}
go func(_remote *SyncContext) {
err = _remote.Connect()
if err != nil {
status.Printf("@(error:Failed to connect to %s: %s)\n", remote.Hostname(), err)
Shutdown("", 1)
}
_remote.KillAllViaPidfiles()
err = _remote.CheckRemoteDeps()
if err != nil {
status.Bail(err)
}
ready <- nil
}(remote)
}
for i := 0; i < len(remotes)+1; i++ {
<-ready
}
err = Sync(local, remotes)
if err != nil {
status.Bail(err)
}
}
}