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copy: Only process each tree once 

This speeds up copying multiple overlapping snapshots from one
repository to another, as we only have to copy the changed parts of
later snapshots.
This commit is contained in:
Michael Eischer 2020-08-22 12:22:00 +02:00
parent 908b23fda0
commit b0a8c4ad6c
1 changed files with 12 additions and 3 deletions
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15
cmd/restic/cmd_copy.go
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@ -108,11 +108,13 @@ func runCopy(opts CopyOptions, gopts GlobalOptions, args []string) error {
return err
}
visitedTrees := restic.NewIDSet()
for sn := range FindFilteredSnapshots(ctx, srcRepo, opts.Hosts, opts.Tags, opts.Paths, args) {
Verbosef("snapshot %s of %v at %s)\n", sn.ID().Str(), sn.Paths, sn.Time)
Verbosef(" copy started, this may take a while...\n")
if err := copyTree(ctx, srcRepo, dstRepo, *sn.Tree); err != nil {
if err := copyTree(ctx, srcRepo, dstRepo, *sn.Tree, visitedTrees); err != nil {
return err
}
debug.Log("tree copied")
@ -134,11 +136,18 @@ func runCopy(opts CopyOptions, gopts GlobalOptions, args []string) error {
return nil
}
func copyTree(ctx context.Context, srcRepo, dstRepo restic.Repository, treeID restic.ID) error {
func copyTree(ctx context.Context, srcRepo, dstRepo restic.Repository, treeID restic.ID, visitedTrees restic.IDSet) error {
// We have already processed this tree
if visitedTrees.Has(treeID) {
return nil
}
tree, err := srcRepo.LoadTree(ctx, treeID)
if err != nil {
return fmt.Errorf("LoadTree(%v) returned error %v", treeID.Str(), err)
}
visitedTrees.Insert(treeID)
// Do we already have this tree blob?
if !dstRepo.Index().Has(treeID, restic.TreeBlob) {
newTreeID, err := dstRepo.SaveTree(ctx, tree)
@ -157,7 +166,7 @@ func copyTree(ctx context.Context, srcRepo, dstRepo restic.Repository, treeID re
for _, entry := range tree.Nodes {
// If it is a directory, recurse
if entry.Type == "dir" && entry.Subtree != nil {
if err := copyTree(ctx, srcRepo, dstRepo, *entry.Subtree); err != nil {
if err := copyTree(ctx, srcRepo, dstRepo, *entry.Subtree, visitedTrees); err != nil {
return err
}
}