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data: split node and snapshot code from restic package

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This commit is contained in:
Michael Eischer
2025-09-23 20:01:09 +02:00
parent c85b157e0e
commit 56ac8360c7
166 changed files with 1170 additions and 1107 deletions
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53
internal/restorer/restorer.go
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@@ -8,6 +8,7 @@ import (
"path/filepath"
"sync/atomic"
"github.com/restic/restic/internal/data"
"github.com/restic/restic/internal/debug"
"github.com/restic/restic/internal/errors"
"github.com/restic/restic/internal/fs"
@@ -21,7 +22,7 @@ import (
// Restorer is used to restore a snapshot to a directory.
type Restorer struct {
repo restic.Repository
sn *restic.Snapshot
sn *data.Snapshot
opts Options
fileList map[string]bool
@@ -98,7 +99,7 @@ func (c *OverwriteBehavior) Type() string {
}
// NewRestorer creates a restorer preloaded with the content from the snapshot id.
func NewRestorer(repo restic.Repository, sn *restic.Snapshot, opts Options) *Restorer {
func NewRestorer(repo restic.Repository, sn *data.Snapshot, opts Options) *Restorer {
r := &Restorer{
repo: repo,
opts: opts,
@@ -113,11 +114,11 @@ func NewRestorer(repo restic.Repository, sn *restic.Snapshot, opts Options) *Res
}
type treeVisitor struct {
enterDir func(node *restic.Node, target, location string) error
visitNode func(node *restic.Node, target, location string) error
enterDir func(node *data.Node, target, location string) error
visitNode func(node *data.Node, target, location string) error
// 'entries' contains all files the snapshot contains for this node. This also includes files
// ignored by the SelectFilter.
leaveDir func(node *restic.Node, target, location string, entries []string) error
leaveDir func(node *data.Node, target, location string, entries []string) error
}
func (res *Restorer) sanitizeError(location string, err error) error {
@@ -154,7 +155,7 @@ func (res *Restorer) traverseTree(ctx context.Context, target string, treeID res
func (res *Restorer) traverseTreeInner(ctx context.Context, target, location string, treeID restic.ID, visitor treeVisitor) (filenames []string, hasRestored bool, err error) {
debug.Log("%v %v %v", target, location, treeID)
tree, err := restic.LoadTree(ctx, res.repo, treeID)
tree, err := data.LoadTree(ctx, res.repo, treeID)
if err != nil {
debug.Log("error loading tree %v: %v", treeID, err)
return nil, hasRestored, res.sanitizeError(location, err)
@@ -206,18 +207,18 @@ func (res *Restorer) traverseTreeInner(ctx context.Context, target, location str
}
// sockets cannot be restored
if node.Type == restic.NodeTypeSocket {
if node.Type == data.NodeTypeSocket {
continue
}
selectedForRestore, childMayBeSelected := res.SelectFilter(nodeLocation, node.Type == restic.NodeTypeDir)
selectedForRestore, childMayBeSelected := res.SelectFilter(nodeLocation, node.Type == data.NodeTypeDir)
debug.Log("SelectFilter returned %v %v for %q", selectedForRestore, childMayBeSelected, nodeLocation)
if selectedForRestore {
hasRestored = true
}
if node.Type == restic.NodeTypeDir {
if node.Type == data.NodeTypeDir {
if node.Subtree == nil {
return nil, hasRestored, errors.Errorf("Dir without subtree in tree %v", treeID.Str())
}
@@ -269,7 +270,7 @@ func (res *Restorer) traverseTreeInner(ctx context.Context, target, location str
return filenames, hasRestored, nil
}
func (res *Restorer) restoreNodeTo(node *restic.Node, target, location string) error {
func (res *Restorer) restoreNodeTo(node *data.Node, target, location string) error {
if !res.opts.DryRun {
debug.Log("restoreNode %v %v %v", node.Name, target, location)
if err := fs.Remove(target); err != nil && !errors.Is(err, os.ErrNotExist) {
@@ -287,7 +288,7 @@ func (res *Restorer) restoreNodeTo(node *restic.Node, target, location string) e
return res.restoreNodeMetadataTo(node, target, location)
}
func (res *Restorer) restoreNodeMetadataTo(node *restic.Node, target, location string) error {
func (res *Restorer) restoreNodeMetadataTo(node *data.Node, target, location string) error {
if res.opts.DryRun {
return nil
}
@@ -299,7 +300,7 @@ func (res *Restorer) restoreNodeMetadataTo(node *restic.Node, target, location s
return err
}
func (res *Restorer) restoreHardlinkAt(node *restic.Node, target, path, location string) error {
func (res *Restorer) restoreHardlinkAt(node *data.Node, target, path, location string) error {
if !res.opts.DryRun {
if err := fs.Remove(path); err != nil && !errors.Is(err, os.ErrNotExist) {
return errors.Wrap(err, "RemoveCreateHardlink")
@@ -368,7 +369,7 @@ func (res *Restorer) RestoreTo(ctx context.Context, dst string) (uint64, error)
// first tree pass: create directories and collect all files to restore
err = res.traverseTree(ctx, dst, *res.sn.Tree, treeVisitor{
enterDir: func(_ *restic.Node, target, location string) error {
enterDir: func(_ *data.Node, target, location string) error {
debug.Log("first pass, enterDir: mkdir %q, leaveDir should restore metadata", location)
if location != string(filepath.Separator) {
res.opts.Progress.AddFile(0)
@@ -376,13 +377,13 @@ func (res *Restorer) RestoreTo(ctx context.Context, dst string) (uint64, error)
return res.ensureDir(target)
},
visitNode: func(node *restic.Node, target, location string) error {
visitNode: func(node *data.Node, target, location string) error {
debug.Log("first pass, visitNode: mkdir %q, leaveDir on second pass should restore metadata", location)
if err := res.ensureDir(filepath.Dir(target)); err != nil {
return err
}
if node.Type != restic.NodeTypeFile {
if node.Type != data.NodeTypeFile {
res.opts.Progress.AddFile(0)
return nil
}
@@ -436,9 +437,9 @@ func (res *Restorer) RestoreTo(ctx context.Context, dst string) (uint64, error)
// second tree pass: restore special files and filesystem metadata
err = res.traverseTree(ctx, dst, *res.sn.Tree, treeVisitor{
visitNode: func(node *restic.Node, target, location string) error {
visitNode: func(node *data.Node, target, location string) error {
debug.Log("second pass, visitNode: restore node %q", location)
if node.Type != restic.NodeTypeFile {
if node.Type != data.NodeTypeFile {
_, err := res.withOverwriteCheck(ctx, node, target, location, false, nil, func(_ bool, _ *fileState) error {
return res.restoreNodeTo(node, target, location)
})
@@ -458,7 +459,7 @@ func (res *Restorer) RestoreTo(ctx context.Context, dst string) (uint64, error)
// don't touch skipped files
return nil
},
leaveDir: func(node *restic.Node, target, location string, expectedFilenames []string) error {
leaveDir: func(node *data.Node, target, location string, expectedFilenames []string) error {
if res.opts.Delete {
if err := res.removeUnexpectedFiles(ctx, target, location, expectedFilenames); err != nil {
return err
@@ -555,7 +556,7 @@ func (res *Restorer) hasRestoredFile(location string) (metadataOnly bool, ok boo
return metadataOnly, ok
}
func (res *Restorer) withOverwriteCheck(ctx context.Context, node *restic.Node, target, location string, isHardlink bool, buf []byte, cb func(updateMetadataOnly bool, matches *fileState) error) ([]byte, error) {
func (res *Restorer) withOverwriteCheck(ctx context.Context, node *data.Node, target, location string, isHardlink bool, buf []byte, cb func(updateMetadataOnly bool, matches *fileState) error) ([]byte, error) {
overwrite, err := shouldOverwrite(res.opts.Overwrite, node, target)
if err != nil {
return buf, err
@@ -570,7 +571,7 @@ func (res *Restorer) withOverwriteCheck(ctx context.Context, node *restic.Node,
var matches *fileState
updateMetadataOnly := false
if node.Type == restic.NodeTypeFile && !isHardlink {
if node.Type == data.NodeTypeFile && !isHardlink {
// if a file fails to verify, then matches is nil which results in restoring from scratch
matches, buf, _ = res.verifyFile(ctx, target, node, false, res.opts.Overwrite == OverwriteIfChanged, buf)
// skip files that are already correct completely
@@ -580,7 +581,7 @@ func (res *Restorer) withOverwriteCheck(ctx context.Context, node *restic.Node,
return buf, cb(updateMetadataOnly, matches)
}
func shouldOverwrite(overwrite OverwriteBehavior, node *restic.Node, destination string) (bool, error) {
func shouldOverwrite(overwrite OverwriteBehavior, node *data.Node, destination string) (bool, error) {
if overwrite == OverwriteAlways || overwrite == OverwriteIfChanged {
return true, nil
}
@@ -605,7 +606,7 @@ func shouldOverwrite(overwrite OverwriteBehavior, node *restic.Node, destination
}
// Snapshot returns the snapshot this restorer is configured to use.
func (res *Restorer) Snapshot() *restic.Snapshot {
func (res *Restorer) Snapshot() *data.Snapshot {
return res.sn
}
@@ -618,7 +619,7 @@ const nVerifyWorkers = 8
// verified.
func (res *Restorer) VerifyFiles(ctx context.Context, dst string, countRestoredFiles uint64, p *progress.Counter) (int, error) {
type mustCheck struct {
node *restic.Node
node *data.Node
path string
}
@@ -639,8 +640,8 @@ func (res *Restorer) VerifyFiles(ctx context.Context, dst string, countRestoredF
defer close(work)
err := res.traverseTree(ctx, dst, *res.sn.Tree, treeVisitor{
visitNode: func(node *restic.Node, target, location string) error {
if node.Type != restic.NodeTypeFile {
visitNode: func(node *data.Node, target, location string) error {
if node.Type != data.NodeTypeFile {
return nil
}
if metadataOnly, ok := res.hasRestoredFile(location); !ok || metadataOnly {
@@ -708,7 +709,7 @@ func (s *fileState) HasMatchingBlob(i int) bool {
// buf and the first return value are scratch space, passed around for reuse.
// Reusing buffers prevents the verifier goroutines allocating all of RAM and
// flushing the filesystem cache (at least on Linux).
func (res *Restorer) verifyFile(ctx context.Context, target string, node *restic.Node, failFast bool, trustMtime bool, buf []byte) (*fileState, []byte, error) {
func (res *Restorer) verifyFile(ctx context.Context, target string, node *data.Node, failFast bool, trustMtime bool, buf []byte) (*fileState, []byte, error) {
f, err := fs.OpenFile(target, fs.O_RDONLY|fs.O_NOFOLLOW, 0)
if err != nil {
return nil, buf, err