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Merge pull request #4958 from mikix/restore-errors

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restore: clean up error handling when restoring metadata
This commit is contained in:
Michael Eischer 2024-08-03 17:58:54 +00:00 committed by GitHub
commit d4db5a364e
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3 changed files with 31 additions and 12 deletions
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7
changelog/unreleased/pull-4958 Normal file
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@ -0,0 +1,7 @@
Bugfix: Don't ignore metadata-setting errors during restore
Restic was accidentally ignoring errors when setting timestamps,
attributes, or file modes during restore. It will now report those
errors (unless it's just a permission error when not running as root).
https://github.com/restic/restic/pull/4958

22
internal/restic/node.go
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@ -229,6 +229,13 @@ func (node *Node) CreateAt(ctx context.Context, path string, repo BlobLoader) er
func (node Node) RestoreMetadata(path string, warn func(msg string)) error {
err := node.restoreMetadata(path, warn)
if err != nil {
// It is common to have permission errors for folders like /home
// unless you're running as root, so ignore those.
if os.Geteuid() > 0 && errors.Is(err, os.ErrPermission) {
debug.Log("not running as root, ignoring permission error for %v: %v",
path, err)
return nil
}
debug.Log("restoreMetadata(%s) error %v", path, err)
}
@ -239,33 +246,26 @@ func (node Node) restoreMetadata(path string, warn func(msg string)) error {
var firsterr error
if err := lchown(path, int(node.UID), int(node.GID)); err != nil {
// Like "cp -a" and "rsync -a" do, we only report lchown permission errors
// if we run as root.
if os.Geteuid() > 0 && os.IsPermission(err) {
debug.Log("not running as root, ignoring lchown permission error for %v: %v",
path, err)
} else {
firsterr = errors.WithStack(err)
}
}
if err := node.RestoreTimestamps(path); err != nil {
debug.Log("error restoring timestamps for dir %v: %v", path, err)
if firsterr != nil {
if firsterr == nil {
firsterr = err
}
}
if err := node.restoreExtendedAttributes(path); err != nil {
debug.Log("error restoring extended attributes for %v: %v", path, err)
if firsterr != nil {
if firsterr == nil {
firsterr = err
}
}
if err := node.restoreGenericAttributes(path, warn); err != nil {
debug.Log("error restoring generic attributes for %v: %v", path, err)
if firsterr != nil {
if firsterr == nil {
firsterr = err
}
}
@ -275,7 +275,7 @@ func (node Node) restoreMetadata(path string, warn func(msg string)) error {
// calls above would fail.
if node.Type != "symlink" {
if err := fs.Chmod(path, node.Mode); err != nil {
if firsterr != nil {
if firsterr == nil {
firsterr = errors.WithStack(err)
}
}

12
internal/restic/node_test.go
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@ -13,6 +13,7 @@ import (
"time"
"github.com/google/go-cmp/cmp"
"github.com/restic/restic/internal/errors"
"github.com/restic/restic/internal/test"
rtest "github.com/restic/restic/internal/test"
)
@ -382,3 +383,14 @@ func TestSymlinkSerializationFormat(t *testing.T) {
test.Assert(t, n2.LinkTargetRaw == nil, "quoted link target is just a helper field and must be unset after decoding")
}
}
func TestNodeRestoreMetadataError(t *testing.T) {
tempdir := t.TempDir()
node := nodeTests[0]
nodePath := filepath.Join(tempdir, node.Name)
// This will fail because the target file does not exist
err := node.RestoreMetadata(nodePath, func(msg string) { rtest.OK(t, fmt.Errorf("Warning triggered for path: %s: %s", nodePath, msg)) })
test.Assert(t, errors.Is(err, os.ErrNotExist), "failed for an unexpected reason")
}