func newTarFile()

in tools/build_tar/buildtar.go [161:202]

• 38 lines of code
• 5 McCabe index (conditional complexity)

func newTarFile(output, directory, compression string, meta fileMeta) (*tarFile, error) {
	var (
		w       io.Writer
		closers []func()
	)
	f, err := os.Create(output)
	if err != nil {
		return nil, err
	}
	closers = append(closers, func() {
		f.Close()
	})
	w = f

	buf := bufio.NewWriter(w)
	closers = append(closers, func() { buf.Flush() })
	w = buf

	switch compression {
	case "":
	case "gz":
		gzw := pargzip.NewWriter(w)
		closers = append(closers, func() { gzw.Close() })
		w = gzw
	case "bz2", "xz":
		return nil, fmt.Errorf("%q compression is not supported yet", compression)
	default:
		return nil, fmt.Errorf("unknown compression %q", compression)
	}

	tw := tar.NewWriter(w)
	closers = append(closers, func() { tw.Close() })

	return &tarFile{
		directory: directory,
		tw:        tw,
		closers:   closers,
		meta:      meta,
		dirsMade:  map[string]struct{}{},
		filesMade: map[string]struct{}{},
	}, nil
}