Пример #1
0
func (backend *BlobsFileBackend) Delete(hash string) error {
	if !backend.loaded {
		panic("backend BlobsFileBackend not loaded")
	}
	if backend.writeOnly {
		return nil
		//panic("backend is in write-only mode")
	}
	blobPos, err := backend.index.GetPos(hash)
	if err != nil {
		return fmt.Errorf("Error fetching GetPos: %v", err)
	}
	if blobPos == nil {
		return fmt.Errorf("Blob %v not found in index", err)
	}
	var f *os.File
	// check if the file is already open for writing
	if blobPos.n == backend.n {
		f = backend.current
	} else {
		f, err = os.OpenFile(backend.filename(blobPos.n), os.O_RDWR, 0666)
		if err != nil {
			return fmt.Errorf("failed to open blobsfile %v", backend.filename(blobPos.n), err)
		}
		defer f.Close()
	}
	// Add Deleted to the flag
	if _, err := f.WriteAt([]byte{Deleted}, int64(blobPos.offset+hashSize)); err != nil {
		return err
	}
	// Delete the index entry
	if err := backend.index.DeletePos(hash); err != nil {
		return err
	}
	// Punch a hole in the file if possible
	if err := fileutil.PunchHole(f, int64(blobPos.offset+Overhead), int64(blobPos.size)); err != nil {
		return fmt.Errorf("failed to punch hole: %v", err)
	}
	return nil
}
Пример #2
0
// PunchHole implements Filer.
func (f *SimpleFileFiler) PunchHole(off, size int64) (err error) {
	return fileutil.PunchHole(f.file, off, size)
}