func (s *FileSnapshotSink) writeMeta() error {
	// Open the meta file
	metaPath := filepath.Join(s.dir, metaFilePath)
	fh, err := os.Create(metaPath)
	if err != nil {
		return err
	}
	defer fh.Close()

	// Buffer the file IO
	buffered := bufio.NewWriter(fh)

	// Write out as JSON
	enc := json.NewEncoder(buffered)
	if err := enc.Encode(&s.meta); err != nil {
		return err
	}

	if err = buffered.Flush(); err != nil {
		return err
	}

	if err = fh.Sync(); err != nil {
		return err
	}

	return nil
}
func (s *FileSnapshotSink) writeMeta() error {
	// Open the meta file
	metaPath := filepath.Join(s.dir, metaFilePath)
	fh, err := os.Create(metaPath)
	if err != nil {
		return err
	}
	defer fh.Close()

	// Buffer the file IO
	buffered := bufio.NewWriter(fh)

	// Write out as JSON
	enc := json.NewEncoder(buffered)
	if err := enc.Encode(&s.meta); err != nil {
		return err
	}

	if err = buffered.Flush(); err != nil {
		return err
	}

	if err = fh.Sync(); err != nil {
		return err
	}

	return nil
}
// writeMeta is used to write out the metadata we have.