package main import ( "context" "fmt" "github.com/restic/restic/internal/backend" "github.com/restic/restic/internal/debug" "github.com/restic/restic/internal/repository" "github.com/restic/restic/internal/restic" "golang.org/x/sync/errgroup" "github.com/spf13/cobra" ) var cmdCopy = &cobra.Command{ Use: "copy [flags] [snapshotID ...]", Short: "Copy snapshots from one repository to another", Long: ` The "copy" command copies one or more snapshots from one repository to another. NOTE: This process will have to both download (read) and upload (write) the entire snapshot(s) due to the different encryption keys used in the source and destination repositories. This /may incur higher bandwidth usage and costs/ than expected during normal backup runs. NOTE: The copying process does not re-chunk files, which may break deduplication between the files copied and files already stored in the destination repository. This means that copied files, which existed in both the source and destination repository, /may occupy up to twice their space/ in the destination repository. This can be mitigated by the "--copy-chunker-params" option when initializing a new destination repository using the "init" command. `, RunE: func(cmd *cobra.Command, args []string) error { return runCopy(copyOptions, globalOptions, args) }, } // CopyOptions bundles all options for the copy command. type CopyOptions struct { secondaryRepoOptions Hosts []string Tags restic.TagLists Paths []string } var copyOptions CopyOptions func init() { cmdRoot.AddCommand(cmdCopy) f := cmdCopy.Flags() initSecondaryRepoOptions(f, ©Options.secondaryRepoOptions, "destination", "to copy snapshots to") f.StringArrayVarP(©Options.Hosts, "host", "H", nil, "only consider snapshots for this `host`, when no snapshot ID is given (can be specified multiple times)") f.Var(©Options.Tags, "tag", "only consider snapshots which include this `taglist`, when no snapshot ID is given") f.StringArrayVar(©Options.Paths, "path", nil, "only consider snapshots which include this (absolute) `path`, when no snapshot ID is given") } func runCopy(opts CopyOptions, gopts GlobalOptions, args []string) error { dstGopts, err := fillSecondaryGlobalOpts(opts.secondaryRepoOptions, gopts, "destination") if err != nil { return err } ctx, cancel := context.WithCancel(gopts.ctx) defer cancel() srcRepo, err := OpenRepository(gopts) if err != nil { return err } dstRepo, err := OpenRepository(dstGopts) if err != nil { return err } if !gopts.NoLock { srcLock, err := lockRepo(ctx, srcRepo) defer unlockRepo(srcLock) if err != nil { return err } } dstLock, err := lockRepo(ctx, dstRepo) defer unlockRepo(dstLock) if err != nil { return err } srcSnapshotLister, err := backend.MemorizeList(ctx, srcRepo.Backend(), restic.SnapshotFile) if err != nil { return err } dstSnapshotLister, err := backend.MemorizeList(ctx, dstRepo.Backend(), restic.SnapshotFile) if err != nil { return err } debug.Log("Loading source index") if err := srcRepo.LoadIndex(ctx); err != nil { return err } debug.Log("Loading destination index") if err := dstRepo.LoadIndex(ctx); err != nil { return err } dstSnapshotByOriginal := make(map[restic.ID][]*restic.Snapshot) for sn := range FindFilteredSnapshots(ctx, dstSnapshotLister, dstRepo, opts.Hosts, opts.Tags, opts.Paths, nil) { if sn.Original != nil && !sn.Original.IsNull() { dstSnapshotByOriginal[*sn.Original] = append(dstSnapshotByOriginal[*sn.Original], sn) } // also consider identical snapshot copies dstSnapshotByOriginal[*sn.ID()] = append(dstSnapshotByOriginal[*sn.ID()], sn) } // remember already processed trees across all snapshots visitedTrees := restic.NewIDSet() for sn := range FindFilteredSnapshots(ctx, srcSnapshotLister, srcRepo, opts.Hosts, opts.Tags, opts.Paths, args) { Verbosef("\nsnapshot %s of %v at %s)\n", sn.ID().Str(), sn.Paths, sn.Time) // check whether the destination has a snapshot with the same persistent ID which has similar snapshot fields srcOriginal := *sn.ID() if sn.Original != nil { srcOriginal = *sn.Original } if originalSns, ok := dstSnapshotByOriginal[srcOriginal]; ok { isCopy := false for _, originalSn := range originalSns { if similarSnapshots(originalSn, sn) { Verbosef("skipping source snapshot %s, was already copied to snapshot %s\n", sn.ID().Str(), originalSn.ID().Str()) isCopy = true break } } if isCopy { continue } } Verbosef(" copy started, this may take a while...\n") if err := copyTree(ctx, srcRepo, dstRepo, visitedTrees, *sn.Tree, gopts.Quiet); err != nil { return err } debug.Log("tree copied") // save snapshot sn.Parent = nil // Parent does not have relevance in the new repo. // Use Original as a persistent snapshot ID if sn.Original == nil { sn.Original = sn.ID() } newID, err := dstRepo.SaveJSONUnpacked(ctx, restic.SnapshotFile, sn) if err != nil { return err } Verbosef("snapshot %s saved\n", newID.Str()) } return nil } func similarSnapshots(sna *restic.Snapshot, snb *restic.Snapshot) bool { // everything except Parent and Original must match if !sna.Time.Equal(snb.Time) || !sna.Tree.Equal(*snb.Tree) || sna.Hostname != snb.Hostname || sna.Username != snb.Username || sna.UID != snb.UID || sna.GID != snb.GID || len(sna.Paths) != len(snb.Paths) || len(sna.Excludes) != len(snb.Excludes) || len(sna.Tags) != len(snb.Tags) { return false } if !sna.HasPaths(snb.Paths) || !sna.HasTags(snb.Tags) { return false } for i, a := range sna.Excludes { if a != snb.Excludes[i] { return false } } return true } func copyTree(ctx context.Context, srcRepo restic.Repository, dstRepo restic.Repository, visitedTrees restic.IDSet, rootTreeID restic.ID, quiet bool) error { wg, wgCtx := errgroup.WithContext(ctx) treeStream := restic.StreamTrees(wgCtx, wg, srcRepo, restic.IDs{rootTreeID}, func(treeID restic.ID) bool { visited := visitedTrees.Has(treeID) visitedTrees.Insert(treeID) return visited }, nil) copyBlobs := restic.NewBlobSet() packList := restic.NewIDSet() enqueue := func(h restic.BlobHandle) { pb := srcRepo.Index().Lookup(h) copyBlobs.Insert(h) for _, p := range pb { packList.Insert(p.PackID) } } wg.Go(func() error { for tree := range treeStream { if tree.Error != nil { return fmt.Errorf("LoadTree(%v) returned error %v", tree.ID.Str(), tree.Error) } // Do we already have this tree blob? treeHandle := restic.BlobHandle{ID: tree.ID, Type: restic.TreeBlob} if !dstRepo.Index().Has(treeHandle) { // copy raw tree bytes to avoid problems if the serialization changes enqueue(treeHandle) } for _, entry := range tree.Nodes { // Recursion into directories is handled by StreamTrees // Copy the blobs for this file. for _, blobID := range entry.Content { h := restic.BlobHandle{Type: restic.DataBlob, ID: blobID} if !dstRepo.Index().Has(h) { enqueue(h) } } } } return nil }) err := wg.Wait() if err != nil { return err } bar := newProgressMax(!quiet, uint64(len(packList)), "packs copied") _, err = repository.Repack(ctx, srcRepo, dstRepo, packList, copyBlobs, bar) bar.Done() return err }