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layout: Add IsNotExist

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This commit is contained in:
Alexander Neumann 2017-04-10 22:16:50 +02:00
parent 698ba57597
commit 0cbd59856c
1 changed files with 18 additions and 4 deletions
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22
src/restic/backend/layout.go
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@ -22,6 +22,7 @@ type Layout interface {
type Filesystem interface {
Join(...string) string
ReadDir(string) ([]os.FileInfo, error)
IsNotExist(error) bool
}
// ensure statically that *LocalFilesystem implements Filesystem.
@ -40,12 +41,12 @@ func (l *LocalFilesystem) ReadDir(dir string) ([]os.FileInfo, error) {
entries, err := f.Readdir(-1)
if err != nil {
return nil, err
return nil, errors.Wrap(err, "Readdir")
}
err = f.Close()
if err != nil {
return nil, err
return nil, errors.Wrap(err, "Close")
}
return entries, nil
@ -56,12 +57,17 @@ func (l *LocalFilesystem) Join(paths ...string) string {
return filepath.Join(paths...)
}
// IsNotExist returns true for errors that are caused by not existing files.
func (l *LocalFilesystem) IsNotExist(err error) bool {
return os.IsNotExist(err)
}
var backendFilenameLength = len(restic.ID{}) * 2
var backendFilename = regexp.MustCompile(fmt.Sprintf("^[a-fA-F0-9]{%d}$", backendFilenameLength))
func hasBackendFile(fs Filesystem, dir string) (bool, error) {
entries, err := fs.ReadDir(dir)
if err != nil && os.IsNotExist(errors.Cause(err)) {
if err != nil && fs.IsNotExist(errors.Cause(err)) {
return false, nil
}
@ -82,7 +88,7 @@ var dataSubdirName = regexp.MustCompile("^[a-fA-F0-9]{2}$")
func hasSubdirBackendFile(fs Filesystem, dir string) (bool, error) {
entries, err := fs.ReadDir(dir)
if err != nil && os.IsNotExist(errors.Cause(err)) {
if err != nil && fs.IsNotExist(errors.Cause(err)) {
return false, nil
}
@ -116,6 +122,7 @@ var ErrLayoutDetectionFailed = errors.New("auto-detecting the filesystem layout
// filesystem at the given path. If repo is nil, an instance of LocalFilesystem
// is used.
func DetectLayout(repo Filesystem, dir string) (Layout, error) {
debug.Log("detect layout at %v", dir)
if repo == nil {
repo = &LocalFilesystem{}
}
@ -168,6 +175,7 @@ func DetectLayout(repo Filesystem, dir string) (Layout, error) {
}, nil
}
debug.Log("layout detection failed")
return nil, ErrLayoutDetectionFailed
}
@ -196,8 +204,14 @@ func ParseLayout(repo Filesystem, layout, defaultLayout, path string) (l Layout,
// use the default layout if auto detection failed
if errors.Cause(err) == ErrLayoutDetectionFailed && defaultLayout != "" {
debug.Log("error: %v, use default layout %v", defaultLayout)
return ParseLayout(repo, defaultLayout, "", path)
}
if err != nil {
return nil, err
}
debug.Log("layout detected: %v", l)
default:
return nil, errors.Errorf("unknown backend layout string %q, may be one of: default, cloud, s3", layout)
}