pkg/compression/compression.go
func XzDecompressor(r io.Reader) (io.ReadCloser, error) {
	r, err := xz.NewReader(r)
	if err != nil {
		return nil, err
	}
	return ioutil.NopCloser(r), nil
}
func XzDecompressor(r io.Reader) (io.ReadCloser, error) {
	r, err := xz.NewReader(r)
	if err != nil {
		return nil, err
	}
	return ioutil.NopCloser(r), nil
}
// XzDecompressor is a DecompressorFunc for the xz compression algorithm.