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280 lines
11 KiB
Go
280 lines
11 KiB
Go
// Package bisync implements bisync
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// Copyright (c) 2017-2020 Chris Nelson
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package bisync
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import (
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"context"
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"crypto/md5"
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"encoding/hex"
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"errors"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"strings"
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"time"
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"github.com/rclone/rclone/cmd"
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"github.com/rclone/rclone/cmd/bisync/bilib"
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"github.com/rclone/rclone/fs"
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"github.com/rclone/rclone/fs/config"
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"github.com/rclone/rclone/fs/config/flags"
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"github.com/rclone/rclone/fs/filter"
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"github.com/rclone/rclone/fs/fserrors"
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"github.com/rclone/rclone/fs/hash"
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"github.com/spf13/cobra"
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)
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// TestFunc allows mocking errors during tests
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type TestFunc func()
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// Options keep bisync options
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type Options struct {
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Resync bool // whether or not this is a resync
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ResyncMode Prefer // which mode to use for resync
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CheckAccess bool
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CheckFilename string
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CheckSync CheckSyncMode
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CreateEmptySrcDirs bool
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RemoveEmptyDirs bool
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MaxDelete int // percentage from 0 to 100
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Force bool
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FiltersFile string
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Workdir string
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OrigBackupDir string
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BackupDir1 string
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BackupDir2 string
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DryRun bool
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NoCleanup bool
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SaveQueues bool // save extra debugging files (test only flag)
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IgnoreListingChecksum bool
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Resilient bool
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Recover bool
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TestFn TestFunc // test-only option, for mocking errors
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Compare CompareOpt
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CompareFlag string
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DebugName string
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MaxLock time.Duration
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ConflictResolve Prefer
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ConflictLoser ConflictLoserAction
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ConflictSuffixFlag string
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ConflictSuffix1 string
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ConflictSuffix2 string
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}
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// Default values
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const (
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DefaultMaxDelete int = 50
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DefaultCheckFilename string = "RCLONE_TEST"
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)
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// DefaultWorkdir is default working directory
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var DefaultWorkdir = filepath.Join(config.GetCacheDir(), "bisync")
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// CheckSyncMode controls when to compare final listings
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type CheckSyncMode int
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// CheckSync modes
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const (
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CheckSyncTrue CheckSyncMode = iota // Compare final listings (default)
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CheckSyncFalse // Disable comparison of final listings
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CheckSyncOnly // Only compare listings from the last run, do not sync
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)
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func (x CheckSyncMode) String() string {
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switch x {
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case CheckSyncTrue:
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return "true"
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case CheckSyncFalse:
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return "false"
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case CheckSyncOnly:
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return "only"
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}
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return "unknown"
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}
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// Set a CheckSync mode from a string
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func (x *CheckSyncMode) Set(s string) error {
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switch strings.ToLower(s) {
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case "true":
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*x = CheckSyncTrue
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case "false":
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*x = CheckSyncFalse
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case "only":
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*x = CheckSyncOnly
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default:
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return fmt.Errorf("unknown check-sync mode for bisync: %q", s)
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}
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return nil
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}
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// Type of the CheckSync value
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func (x *CheckSyncMode) Type() string {
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return "string"
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}
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// Opt keeps command line options
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var Opt Options
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func init() {
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Opt.MaxLock = 0
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cmd.Root.AddCommand(commandDefinition)
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cmdFlags := commandDefinition.Flags()
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// when adding new flags, remember to also update the rc params:
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// cmd/bisync/rc.go cmd/bisync/help.go (not docs/content/rc.md)
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// and the Command line syntax section of docs/content/bisync.md (it doesn't update automatically)
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flags.BoolVarP(cmdFlags, &Opt.Resync, "resync", "1", Opt.Resync, "Performs the resync run. Equivalent to --resync-mode path1. Consider using --verbose or --dry-run first.", "")
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flags.FVarP(cmdFlags, &Opt.ResyncMode, "resync-mode", "", "During resync, prefer the version that is: path1, path2, newer, older, larger, smaller (default: path1 if --resync, otherwise none for no resync.)", "")
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flags.BoolVarP(cmdFlags, &Opt.CheckAccess, "check-access", "", Opt.CheckAccess, makeHelp("Ensure expected {CHECKFILE} files are found on both Path1 and Path2 filesystems, else abort."), "")
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flags.StringVarP(cmdFlags, &Opt.CheckFilename, "check-filename", "", Opt.CheckFilename, makeHelp("Filename for --check-access (default: {CHECKFILE})"), "")
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flags.BoolVarP(cmdFlags, &Opt.Force, "force", "", Opt.Force, "Bypass --max-delete safety check and run the sync. Consider using with --verbose", "")
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flags.FVarP(cmdFlags, &Opt.CheckSync, "check-sync", "", "Controls comparison of final listings: true|false|only (default: true)", "")
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flags.BoolVarP(cmdFlags, &Opt.CreateEmptySrcDirs, "create-empty-src-dirs", "", Opt.CreateEmptySrcDirs, "Sync creation and deletion of empty directories. (Not compatible with --remove-empty-dirs)", "")
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flags.BoolVarP(cmdFlags, &Opt.RemoveEmptyDirs, "remove-empty-dirs", "", Opt.RemoveEmptyDirs, "Remove ALL empty directories at the final cleanup step.", "")
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flags.StringVarP(cmdFlags, &Opt.FiltersFile, "filters-file", "", Opt.FiltersFile, "Read filtering patterns from a file", "")
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flags.StringVarP(cmdFlags, &Opt.Workdir, "workdir", "", Opt.Workdir, makeHelp("Use custom working dir - useful for testing. (default: {WORKDIR})"), "")
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flags.StringVarP(cmdFlags, &Opt.BackupDir1, "backup-dir1", "", Opt.BackupDir1, "--backup-dir for Path1. Must be a non-overlapping path on the same remote.", "")
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flags.StringVarP(cmdFlags, &Opt.BackupDir2, "backup-dir2", "", Opt.BackupDir2, "--backup-dir for Path2. Must be a non-overlapping path on the same remote.", "")
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flags.StringVarP(cmdFlags, &Opt.DebugName, "debugname", "", Opt.DebugName, "Debug by tracking one file at various points throughout a bisync run (when -v or -vv)", "")
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flags.BoolVarP(cmdFlags, &tzLocal, "localtime", "", tzLocal, "Use local time in listings (default: UTC)", "")
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flags.BoolVarP(cmdFlags, &Opt.NoCleanup, "no-cleanup", "", Opt.NoCleanup, "Retain working files (useful for troubleshooting and testing).", "")
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flags.BoolVarP(cmdFlags, &Opt.IgnoreListingChecksum, "ignore-listing-checksum", "", Opt.IgnoreListingChecksum, "Do not use checksums for listings (add --ignore-checksum to additionally skip post-copy checksum checks)", "")
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flags.BoolVarP(cmdFlags, &Opt.Resilient, "resilient", "", Opt.Resilient, "Allow future runs to retry after certain less-serious errors, instead of requiring --resync. Use at your own risk!", "")
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flags.BoolVarP(cmdFlags, &Opt.Recover, "recover", "", Opt.Recover, "Automatically recover from interruptions without requiring --resync.", "")
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flags.StringVarP(cmdFlags, &Opt.CompareFlag, "compare", "", Opt.CompareFlag, "Comma-separated list of bisync-specific compare options ex. 'size,modtime,checksum' (default: 'size,modtime')", "")
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flags.BoolVarP(cmdFlags, &Opt.Compare.NoSlowHash, "no-slow-hash", "", Opt.Compare.NoSlowHash, "Ignore listing checksums only on backends where they are slow", "")
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flags.BoolVarP(cmdFlags, &Opt.Compare.SlowHashSyncOnly, "slow-hash-sync-only", "", Opt.Compare.SlowHashSyncOnly, "Ignore slow checksums for listings and deltas, but still consider them during sync calls.", "")
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flags.BoolVarP(cmdFlags, &Opt.Compare.DownloadHash, "download-hash", "", Opt.Compare.DownloadHash, "Compute hash by downloading when otherwise unavailable. (warning: may be slow and use lots of data!)", "")
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flags.DurationVarP(cmdFlags, &Opt.MaxLock, "max-lock", "", Opt.MaxLock, "Consider lock files older than this to be expired (default: 0 (never expire)) (minimum: 2m)", "")
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flags.FVarP(cmdFlags, &Opt.ConflictResolve, "conflict-resolve", "", "Automatically resolve conflicts by preferring the version that is: "+ConflictResolveList+" (default: none)", "")
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flags.FVarP(cmdFlags, &Opt.ConflictLoser, "conflict-loser", "", "Action to take on the loser of a sync conflict (when there is a winner) or on both files (when there is no winner): "+ConflictLoserList+" (default: num)", "")
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flags.StringVarP(cmdFlags, &Opt.ConflictSuffixFlag, "conflict-suffix", "", Opt.ConflictSuffixFlag, "Suffix to use when renaming a --conflict-loser. Can be either one string or two comma-separated strings to assign different suffixes to Path1/Path2. (default: 'conflict')", "")
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_ = cmdFlags.MarkHidden("debugname")
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_ = cmdFlags.MarkHidden("localtime")
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}
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// bisync command definition
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var commandDefinition = &cobra.Command{
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Use: "bisync remote1:path1 remote2:path2",
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Short: shortHelp,
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Long: longHelp,
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Annotations: map[string]string{
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"versionIntroduced": "v1.58",
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"groups": "Filter,Copy,Important",
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"status": "Beta",
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},
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RunE: func(command *cobra.Command, args []string) error {
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// NOTE: avoid putting too much handling here, as it won't apply to the rc.
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// Generally it's best to put init-type stuff in Bisync() (operations.go)
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cmd.CheckArgs(2, 2, command, args)
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fs1, file1, fs2, file2 := cmd.NewFsSrcDstFiles(args)
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if file1 != "" || file2 != "" {
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return errors.New("paths must be existing directories")
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}
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ctx := context.Background()
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opt := Opt
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opt.applyContext(ctx)
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if tzLocal {
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TZ = time.Local
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}
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commonHashes := fs1.Hashes().Overlap(fs2.Hashes())
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isDropbox1 := strings.HasPrefix(fs1.String(), "Dropbox")
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isDropbox2 := strings.HasPrefix(fs2.String(), "Dropbox")
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if commonHashes == hash.Set(0) && (isDropbox1 || isDropbox2) {
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ci := fs.GetConfig(ctx)
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if !ci.DryRun && !ci.RefreshTimes {
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fs.Debugf(nil, "Using flag --refresh-times is recommended")
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}
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}
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fs.Logf(nil, "bisync is IN BETA. Don't use in production!")
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cmd.Run(false, true, command, func() error {
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err := Bisync(ctx, fs1, fs2, &opt)
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if err == ErrBisyncAborted {
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return fserrors.FatalError(err)
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}
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return err
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})
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return nil
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},
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}
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func (opt *Options) applyContext(ctx context.Context) {
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maxDelete := DefaultMaxDelete
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ci := fs.GetConfig(ctx)
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if ci.MaxDelete >= 0 {
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maxDelete = int(ci.MaxDelete)
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}
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if maxDelete < 0 {
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maxDelete = 0
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}
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if maxDelete > 100 {
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maxDelete = 100
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}
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opt.MaxDelete = maxDelete
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// reset MaxDelete for fs/operations, bisync handles this parameter specially
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ci.MaxDelete = -1
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opt.DryRun = ci.DryRun
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}
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func (opt *Options) setDryRun(ctx context.Context) context.Context {
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ctxNew, ci := fs.AddConfig(ctx)
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ci.DryRun = opt.DryRun
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return ctxNew
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}
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func (opt *Options) applyFilters(ctx context.Context) (context.Context, error) {
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filtersFile := opt.FiltersFile
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if filtersFile == "" {
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return ctx, nil
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}
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f, err := os.Open(filtersFile)
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if err != nil {
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return ctx, fmt.Errorf("specified filters file does not exist: %s", filtersFile)
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}
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fs.Infof(nil, "Using filters file %s", filtersFile)
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hasher := md5.New()
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if _, err := io.Copy(hasher, f); err != nil {
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_ = f.Close()
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return ctx, err
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}
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gotHash := hex.EncodeToString(hasher.Sum(nil))
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_ = f.Close()
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hashFile := filtersFile + ".md5"
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wantHash, err := os.ReadFile(hashFile)
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if err != nil && !opt.Resync {
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return ctx, fmt.Errorf("filters file md5 hash not found (must run --resync): %s", filtersFile)
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}
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if gotHash != string(wantHash) && !opt.Resync {
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return ctx, fmt.Errorf("filters file has changed (must run --resync): %s", filtersFile)
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}
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if opt.Resync {
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if opt.DryRun {
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fs.Infof(nil, "Skipped storing filters file hash to %s as --dry-run is set", hashFile)
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} else {
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fs.Infof(nil, "Storing filters file hash to %s", hashFile)
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if err := os.WriteFile(hashFile, []byte(gotHash), bilib.PermSecure); err != nil {
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return ctx, err
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}
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}
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}
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// Prepend our filter file first in the list
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filterOpt := filter.GetConfig(ctx).Opt
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filterOpt.FilterFrom = append([]string{filtersFile}, filterOpt.FilterFrom...)
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newFilter, err := filter.NewFilter(&filterOpt)
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if err != nil {
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return ctx, fmt.Errorf("invalid filters file: %s: %w", filtersFile, err)
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}
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return filter.ReplaceConfig(ctx, newFilter), nil
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}
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