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operations.go
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operations.go
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// Package bisync implements bisync
// Copyright (c) 2017-2020 Chris Nelson
// Contributions to original python version: Hildo G. Jr., e2t, kalemas, silenceleaf
package bisync
import (
"context"
"errors"
"fmt"
"os"
"path/filepath"
"runtime"
"strings"
gosync "sync"
"time"
"github.com/rclone/rclone/cmd/bisync/bilib"
"github.com/rclone/rclone/fs"
"github.com/rclone/rclone/fs/accounting"
"github.com/rclone/rclone/fs/log"
"github.com/rclone/rclone/fs/operations"
"github.com/rclone/rclone/lib/atexit"
"github.com/rclone/rclone/lib/terminal"
)
// ErrBisyncAborted signals that bisync is aborted and forces exit code 2
var ErrBisyncAborted = errors.New("bisync aborted")
// bisyncRun keeps bisync runtime state
type bisyncRun struct {
fs1 fs.Fs
fs2 fs.Fs
abort bool
critical bool
retryable bool
basePath string
workDir string
listing1 string
listing2 string
newListing1 string
newListing2 string
aliases bilib.AliasMap
opt *Options
octx context.Context
fctx context.Context
InGracefulShutdown bool
CleanupCompleted bool
SyncCI *fs.ConfigInfo
CancelSync context.CancelFunc
DebugName string
lockFile string
renames renames
resyncIs1to2 bool
}
type queues struct {
copy1to2 bilib.Names
copy2to1 bilib.Names
renameSkipped bilib.Names // not renamed because it was equal
skippedDirs1 *fileList
skippedDirs2 *fileList
deletedonboth bilib.Names
}
// Bisync handles lock file, performs bisync run and checks exit status
func Bisync(ctx context.Context, fs1, fs2 fs.Fs, optArg *Options) (err error) {
defer resetGlobals()
opt := *optArg // ensure that input is never changed
b := &bisyncRun{
fs1: fs1,
fs2: fs2,
opt: &opt,
DebugName: opt.DebugName,
}
if opt.CheckFilename == "" {
opt.CheckFilename = DefaultCheckFilename
}
if opt.Workdir == "" {
opt.Workdir = DefaultWorkdir
}
ci := fs.GetConfig(ctx)
opt.OrigBackupDir = ci.BackupDir
if ci.TerminalColorMode == fs.TerminalColorModeAlways || (ci.TerminalColorMode == fs.TerminalColorModeAuto && !log.Redirected()) {
Colors = true
}
err = b.setCompareDefaults(ctx)
if err != nil {
return err
}
b.setResyncDefaults()
err = b.setResolveDefaults(ctx)
if err != nil {
return err
}
if b.workDir, err = filepath.Abs(opt.Workdir); err != nil {
return fmt.Errorf("failed to make workdir absolute: %w", err)
}
if err = os.MkdirAll(b.workDir, os.ModePerm); err != nil {
return fmt.Errorf("failed to create workdir: %w", err)
}
// Produce a unique name for the sync operation
b.basePath = bilib.BasePath(ctx, b.workDir, b.fs1, b.fs2)
b.listing1 = b.basePath + ".path1.lst"
b.listing2 = b.basePath + ".path2.lst"
b.newListing1 = b.listing1 + "-new"
b.newListing2 = b.listing2 + "-new"
b.aliases = bilib.AliasMap{}
err = b.checkSyntax()
if err != nil {
return err
}
// Handle lock file
err = b.setLockFile()
if err != nil {
return err
}
// Handle SIGINT
var finaliseOnce gosync.Once
finalise := func() {
finaliseOnce.Do(func() {
if atexit.Signalled() {
if b.opt.Resync {
fs.Logf(nil, Color(terminal.GreenFg, "No need to gracefully shutdown during --resync (just run it again.)"))
} else {
fs.Logf(nil, Color(terminal.YellowFg, "Attempting to gracefully shutdown. (Send exit signal again for immediate un-graceful shutdown.)"))
b.InGracefulShutdown = true
if b.SyncCI != nil {
fs.Infof(nil, Color(terminal.YellowFg, "Telling Sync to wrap up early."))
b.SyncCI.MaxTransfer = 1
b.SyncCI.MaxDuration = 1 * time.Second
b.SyncCI.CutoffMode = fs.CutoffModeSoft
gracePeriod := 30 * time.Second // TODO: flag to customize this?
if !waitFor("Canceling Sync if not done in", gracePeriod, func() bool { return b.CleanupCompleted }) {
fs.Logf(nil, Color(terminal.YellowFg, "Canceling sync and cleaning up"))
b.CancelSync()
waitFor("Aborting Bisync if not done in", 60*time.Second, func() bool { return b.CleanupCompleted })
}
} else {
// we haven't started to sync yet, so we're good.
// no need to worry about the listing files, as we haven't overwritten them yet.
b.CleanupCompleted = true
fs.Logf(nil, Color(terminal.GreenFg, "Graceful shutdown completed successfully."))
}
}
if !b.CleanupCompleted {
if !b.opt.Resync {
fs.Logf(nil, Color(terminal.HiRedFg, "Graceful shutdown failed."))
fs.Logf(nil, Color(terminal.RedFg, "Bisync interrupted. Must run --resync to recover."))
}
markFailed(b.listing1)
markFailed(b.listing2)
}
b.removeLockFile()
}
})
}
fnHandle := atexit.Register(finalise)
defer atexit.Unregister(fnHandle)
// run bisync
err = b.runLocked(ctx)
b.removeLockFile()
b.CleanupCompleted = true
if b.InGracefulShutdown {
if err == context.Canceled || err == accounting.ErrorMaxTransferLimitReachedGraceful {
err = nil
b.critical = false
}
if err == nil {
fs.Logf(nil, Color(terminal.GreenFg, "Graceful shutdown completed successfully."))
}
}
if b.critical {
if b.retryable && b.opt.Resilient {
fs.Errorf(nil, Color(terminal.RedFg, "Bisync critical error: %v"), err)
fs.Errorf(nil, Color(terminal.YellowFg, "Bisync aborted. Error is retryable without --resync due to --resilient mode."))
} else {
if bilib.FileExists(b.listing1) {
_ = os.Rename(b.listing1, b.listing1+"-err")
}
if bilib.FileExists(b.listing2) {
_ = os.Rename(b.listing2, b.listing2+"-err")
}
fs.Errorf(nil, Color(terminal.RedFg, "Bisync critical error: %v"), err)
fs.Errorf(nil, Color(terminal.RedFg, "Bisync aborted. Must run --resync to recover."))
}
return ErrBisyncAborted
}
if b.abort && !b.InGracefulShutdown {
fs.Logf(nil, Color(terminal.RedFg, "Bisync aborted. Please try again."))
}
if err == nil {
fs.Infof(nil, Color(terminal.GreenFg, "Bisync successful"))
}
return err
}
// runLocked performs a full bisync run
func (b *bisyncRun) runLocked(octx context.Context) (err error) {
opt := b.opt
path1 := bilib.FsPath(b.fs1)
path2 := bilib.FsPath(b.fs2)
if opt.CheckSync == CheckSyncOnly {
fs.Infof(nil, "Validating listings for Path1 %s vs Path2 %s", quotePath(path1), quotePath(path2))
if err = b.checkSync(b.listing1, b.listing2); err != nil {
b.critical = true
b.retryable = true
}
return err
}
fs.Infof(nil, "Synching Path1 %s with Path2 %s", quotePath(path1), quotePath(path2))
if opt.DryRun {
// In --dry-run mode, preserve original listings and save updates to the .lst-dry files
origListing1 := b.listing1
origListing2 := b.listing2
b.listing1 += "-dry"
b.listing2 += "-dry"
b.newListing1 = b.listing1 + "-new"
b.newListing2 = b.listing2 + "-new"
if err := bilib.CopyFileIfExists(origListing1, b.listing1); err != nil {
return err
}
if err := bilib.CopyFileIfExists(origListing2, b.listing2); err != nil {
return err
}
}
// Create second context with filters
var fctx context.Context
if fctx, err = b.opt.applyFilters(octx); err != nil {
b.critical = true
b.retryable = true
return
}
b.octx = octx
b.fctx = fctx
// overlapping paths check
err = b.overlappingPathsCheck(fctx, b.fs1, b.fs2)
if err != nil {
b.critical = true
b.retryable = true
return err
}
// Generate Path1 and Path2 listings and copy any unique Path2 files to Path1
if opt.Resync {
return b.resync(octx, fctx)
}
// Check for existence of prior Path1 and Path2 listings
if !bilib.FileExists(b.listing1) || !bilib.FileExists(b.listing2) {
if b.opt.Recover && bilib.FileExists(b.listing1+"-old") && bilib.FileExists(b.listing2+"-old") {
errTip := fmt.Sprintf(Color(terminal.CyanFg, "Path1: %s\n"), Color(terminal.HiBlueFg, b.listing1))
errTip += fmt.Sprintf(Color(terminal.CyanFg, "Path2: %s"), Color(terminal.HiBlueFg, b.listing2))
fs.Logf(nil, Color(terminal.YellowFg, "Listings not found. Reverting to prior backup as --recover is set. \n")+errTip)
if opt.CheckSync != CheckSyncFalse {
// Run CheckSync to ensure old listing is valid (garbage in, garbage out!)
fs.Infof(nil, "Validating backup listings for Path1 %s vs Path2 %s", quotePath(path1), quotePath(path2))
if err = b.checkSync(b.listing1+"-old", b.listing2+"-old"); err != nil {
b.critical = true
b.retryable = true
return err
}
fs.Infof(nil, Color(terminal.GreenFg, "Backup listing is valid."))
}
b.revertToOldListings()
} else {
// On prior critical error abort, the prior listings are renamed to .lst-err to lock out further runs
b.critical = true
b.retryable = true
errTip := Color(terminal.MagentaFg, "Tip: here are the filenames we were looking for. Do they exist? \n")
errTip += fmt.Sprintf(Color(terminal.CyanFg, "Path1: %s\n"), Color(terminal.HiBlueFg, b.listing1))
errTip += fmt.Sprintf(Color(terminal.CyanFg, "Path2: %s\n"), Color(terminal.HiBlueFg, b.listing2))
errTip += Color(terminal.MagentaFg, "Try running this command to inspect the work dir: \n")
errTip += fmt.Sprintf(Color(terminal.HiCyanFg, "rclone lsl \"%s\""), b.workDir)
return errors.New("cannot find prior Path1 or Path2 listings, likely due to critical error on prior run \n" + errTip)
}
}
fs.Infof(nil, "Building Path1 and Path2 listings")
ls1, ls2, err = b.makeMarchListing(fctx)
if err != nil || accounting.Stats(fctx).Errored() {
fs.Errorf(nil, Color(terminal.RedFg, "There were errors while building listings. Aborting as it is too dangerous to continue."))
b.critical = true
b.retryable = true
return err
}
// Check for Path1 deltas relative to the prior sync
fs.Infof(nil, "Path1 checking for diffs")
ds1, err := b.findDeltas(fctx, b.fs1, b.listing1, ls1, "Path1")
if err != nil {
return err
}
ds1.printStats()
// Check for Path2 deltas relative to the prior sync
fs.Infof(nil, "Path2 checking for diffs")
ds2, err := b.findDeltas(fctx, b.fs2, b.listing2, ls2, "Path2")
if err != nil {
return err
}
ds2.printStats()
// Check access health on the Path1 and Path2 filesystems
if opt.CheckAccess {
fs.Infof(nil, "Checking access health")
err = b.checkAccess(ds1.checkFiles, ds2.checkFiles)
if err != nil {
b.critical = true
b.retryable = true
return
}
}
// Check for too many deleted files - possible error condition.
// Don't want to start deleting on the other side!
if !opt.Force {
if ds1.excessDeletes() || ds2.excessDeletes() {
b.abort = true
return errors.New("too many deletes")
}
}
// Check for all files changed such as all dates changed due to DST change
// to avoid errant copy everything.
if !opt.Force {
msg := "Safety abort: all files were changed on %s %s. Run with --force if desired."
if !ds1.foundSame {
fs.Errorf(nil, msg, ds1.msg, quotePath(path1))
}
if !ds2.foundSame {
fs.Errorf(nil, msg, ds2.msg, quotePath(path2))
}
if !ds1.foundSame || !ds2.foundSame {
b.abort = true
return errors.New("all files were changed")
}
}
// Determine and apply changes to Path1 and Path2
noChanges := ds1.empty() && ds2.empty()
changes1 := false // 2to1
changes2 := false // 1to2
results2to1 := []Results{}
results1to2 := []Results{}
queues := queues{}
if noChanges {
fs.Infof(nil, "No changes found")
} else {
fs.Infof(nil, "Applying changes")
changes1, changes2, results2to1, results1to2, queues, err = b.applyDeltas(octx, ds1, ds2)
if err != nil {
if b.InGracefulShutdown && (err == context.Canceled || err == accounting.ErrorMaxTransferLimitReachedGraceful || strings.Contains(err.Error(), "context canceled")) {
fs.Infof(nil, "Ignoring sync error due to Graceful Shutdown: %v", err)
} else {
b.critical = true
// b.retryable = true // not sure about this one
return err
}
}
}
// Clean up and check listings integrity
fs.Infof(nil, "Updating listings")
var err1, err2 error
if b.DebugName != "" {
l1, _ := b.loadListing(b.listing1)
l2, _ := b.loadListing(b.listing2)
newl1, _ := b.loadListing(b.newListing1)
newl2, _ := b.loadListing(b.newListing2)
b.debug(b.DebugName, fmt.Sprintf("pre-saveOldListings, ls1 has name?: %v, ls2 has name?: %v", l1.has(b.DebugName), l2.has(b.DebugName)))
b.debug(b.DebugName, fmt.Sprintf("pre-saveOldListings, newls1 has name?: %v, newls2 has name?: %v", newl1.has(b.DebugName), newl2.has(b.DebugName)))
}
b.saveOldListings()
// save new listings
// NOTE: "changes" in this case does not mean this run vs. last run, it means start of this run vs. end of this run.
// i.e. whether we can use the March lst-new as this side's lst without modifying it.
if noChanges {
b.replaceCurrentListings()
} else {
if changes1 || b.InGracefulShutdown { // 2to1
err1 = b.modifyListing(fctx, b.fs2, b.fs1, results2to1, queues, false)
} else {
err1 = bilib.CopyFileIfExists(b.newListing1, b.listing1)
}
if changes2 || b.InGracefulShutdown { // 1to2
err2 = b.modifyListing(fctx, b.fs1, b.fs2, results1to2, queues, true)
} else {
err2 = bilib.CopyFileIfExists(b.newListing2, b.listing2)
}
}
if b.DebugName != "" {
l1, _ := b.loadListing(b.listing1)
l2, _ := b.loadListing(b.listing2)
b.debug(b.DebugName, fmt.Sprintf("post-modifyListing, ls1 has name?: %v, ls2 has name?: %v", l1.has(b.DebugName), l2.has(b.DebugName)))
}
err = err1
if err == nil {
err = err2
}
if err != nil {
b.critical = true
b.retryable = true
return err
}
if !opt.NoCleanup {
_ = os.Remove(b.newListing1)
_ = os.Remove(b.newListing2)
}
if opt.CheckSync == CheckSyncTrue && !opt.DryRun {
fs.Infof(nil, "Validating listings for Path1 %s vs Path2 %s", quotePath(path1), quotePath(path2))
if err := b.checkSync(b.listing1, b.listing2); err != nil {
b.critical = true
return err
}
}
// Optional rmdirs for empty directories
if opt.RemoveEmptyDirs {
fs.Infof(nil, "Removing empty directories")
fctx = b.setBackupDir(fctx, 1)
err1 := operations.Rmdirs(fctx, b.fs1, "", true)
fctx = b.setBackupDir(fctx, 2)
err2 := operations.Rmdirs(fctx, b.fs2, "", true)
err := err1
if err == nil {
err = err2
}
if err != nil {
b.critical = true
b.retryable = true
return err
}
}
return nil
}
// checkSync validates listings
func (b *bisyncRun) checkSync(listing1, listing2 string) error {
files1, err := b.loadListing(listing1)
if err != nil {
return fmt.Errorf("cannot read prior listing of Path1: %w", err)
}
files2, err := b.loadListing(listing2)
if err != nil {
return fmt.Errorf("cannot read prior listing of Path2: %w", err)
}
ok := true
for _, file := range files1.list {
if !files2.has(file) && !files2.has(b.aliases.Alias(file)) {
b.indent("ERROR", file, "Path1 file not found in Path2")
ok = false
} else {
if !b.fileInfoEqual(file, files2.getTryAlias(file, b.aliases.Alias(file)), files1, files2) {
ok = false
}
}
}
for _, file := range files2.list {
if !files1.has(file) && !files1.has(b.aliases.Alias(file)) {
b.indent("ERROR", file, "Path2 file not found in Path1")
ok = false
}
}
if !ok {
return errors.New("path1 and path2 are out of sync, run --resync to recover")
}
return nil
}
// checkAccess validates access health
func (b *bisyncRun) checkAccess(checkFiles1, checkFiles2 bilib.Names) error {
ok := true
opt := b.opt
prefix := "Access test failed:"
numChecks1 := len(checkFiles1)
numChecks2 := len(checkFiles2)
if numChecks1 == 0 || numChecks1 != numChecks2 {
if numChecks1 == 0 && numChecks2 == 0 {
fs.Logf("--check-access", Color(terminal.RedFg, "Failed to find any files named %s\n More info: %s"), Color(terminal.CyanFg, opt.CheckFilename), Color(terminal.BlueFg, "https://rclone.org/bisync/#check-access"))
}
fs.Errorf(nil, "%s Path1 count %d, Path2 count %d - %s", prefix, numChecks1, numChecks2, opt.CheckFilename)
ok = false
}
for file := range checkFiles1 {
if !checkFiles2.Has(file) {
b.indentf("ERROR", file, "%s Path1 file not found in Path2", prefix)
ok = false
}
}
for file := range checkFiles2 {
if !checkFiles1.Has(file) {
b.indentf("ERROR", file, "%s Path2 file not found in Path1", prefix)
ok = false
}
}
if !ok {
return errors.New("check file check failed")
}
fs.Infof(nil, "Found %d matching %q files on both paths", numChecks1, opt.CheckFilename)
return nil
}
func (b *bisyncRun) testFn() {
if b.opt.TestFn != nil {
b.opt.TestFn()
}
}
func (b *bisyncRun) handleErr(o interface{}, msg string, err error, critical, retryable bool) {
if err != nil {
if retryable {
b.retryable = true
}
if critical {
b.critical = true
b.abort = true
fs.Errorf(o, "%s: %v", msg, err)
} else {
fs.Infof(o, "%s: %v", msg, err)
}
}
}
// setBackupDir overrides --backup-dir with path-specific version, if set, in each direction
func (b *bisyncRun) setBackupDir(ctx context.Context, destPath int) context.Context {
ci := fs.GetConfig(ctx)
ci.BackupDir = b.opt.OrigBackupDir
if destPath == 1 && b.opt.BackupDir1 != "" {
ci.BackupDir = b.opt.BackupDir1
}
if destPath == 2 && b.opt.BackupDir2 != "" {
ci.BackupDir = b.opt.BackupDir2
}
fs.Debugf(ci.BackupDir, "updated backup-dir for Path%d", destPath)
return ctx
}
func (b *bisyncRun) overlappingPathsCheck(fctx context.Context, fs1, fs2 fs.Fs) error {
if operations.OverlappingFilterCheck(fctx, fs2, fs1) {
err = fmt.Errorf(Color(terminal.RedFg, "Overlapping paths detected. Cannot bisync between paths that overlap, unless excluded by filters."))
return err
}
// need to test our BackupDirs too, as sync will be fooled by our --files-from filters
testBackupDir := func(ctx context.Context, destPath int) error {
src := fs1
dst := fs2
if destPath == 1 {
src = fs2
dst = fs1
}
ctxBackupDir := b.setBackupDir(ctx, destPath)
ci := fs.GetConfig(ctxBackupDir)
if ci.BackupDir != "" {
// operations.BackupDir should return an error if not properly excluded
_, err = operations.BackupDir(fctx, dst, src, "")
return err
}
return nil
}
err = testBackupDir(fctx, 1)
if err != nil {
return err
}
err = testBackupDir(fctx, 2)
if err != nil {
return err
}
return nil
}
func (b *bisyncRun) checkSyntax() error {
// check for odd number of quotes in path, usually indicating an escaping issue
path1 := bilib.FsPath(b.fs1)
path2 := bilib.FsPath(b.fs2)
if strings.Count(path1, `"`)%2 != 0 || strings.Count(path2, `"`)%2 != 0 {
return fmt.Errorf(Color(terminal.RedFg, `detected an odd number of quotes in your path(s). This is usually a mistake indicating incorrect escaping.
Please check your command and try again. Note that on Windows, quoted paths must not have a trailing slash, or it will be interpreted as escaping the quote. path1: %v path2: %v`), path1, path2)
}
// check for other syntax issues
_, err = os.Stat(b.basePath)
if err != nil {
if strings.Contains(err.Error(), "syntax is incorrect") {
return fmt.Errorf(Color(terminal.RedFg, `syntax error detected in your path(s). Please check your command and try again.
Note that on Windows, quoted paths must not have a trailing slash, or it will be interpreted as escaping the quote. path1: %v path2: %v error: %v`), path1, path2, err)
}
}
if runtime.GOOS == "windows" && (strings.Contains(path1, " --") || strings.Contains(path2, " --")) {
return fmt.Errorf(Color(terminal.RedFg, `detected possible flags in your path(s). This is usually a mistake indicating incorrect escaping or quoting (possibly closing quote is missing?).
Please check your command and try again. Note that on Windows, quoted paths must not have a trailing slash, or it will be interpreted as escaping the quote. path1: %v path2: %v`), path1, path2)
}
return nil
}
func (b *bisyncRun) debug(nametocheck, msgiftrue string) {
if b.DebugName != "" && b.DebugName == nametocheck {
fs.Infof(Color(terminal.MagentaBg, "DEBUGNAME "+b.DebugName), Color(terminal.MagentaBg, msgiftrue))
}
}
func (b *bisyncRun) debugFn(nametocheck string, fn func()) {
if b.DebugName != "" && b.DebugName == nametocheck {
fn()
}
}
// waitFor runs fn() until it returns true or the timeout expires
func waitFor(msg string, totalWait time.Duration, fn func() bool) (ok bool) {
const individualWait = 1 * time.Second
for i := 0; i < int(totalWait/individualWait); i++ {
ok = fn()
if ok {
return ok
}
fs.Infof(nil, Color(terminal.YellowFg, "%s: %vs"), msg, int(totalWait/individualWait)-i)
time.Sleep(individualWait)
}
return false
}
// mainly to make sure tests don't interfere with each other when running more than one
func resetGlobals() {
downloadHash = false
logger = operations.NewLoggerOpt()
ignoreListingChecksum = false
ignoreListingModtime = false
hashTypes = nil
queueCI = nil
hashType = 0
fsrc, fdst = nil, nil
fcrypt = nil
Opt = Options{}
once = gosync.Once{}
downloadHashWarn = gosync.Once{}
firstDownloadHash = gosync.Once{}
ls1 = newFileList()
ls2 = newFileList()
err = nil
firstErr = nil
marchCtx = nil
}