Function ExtractMetaFromTarball

go/model/model.go:295–307

ExtractMetaFromTarball extract metadata from given tarball and return the metadata json string. This function do not unzip the whole model tarball

(tarballName, cwd string)

// and return the metadata json string. This function do not
// unzip the whole model tarball
func ExtractMetaFromTarball(tarballName, cwd string) (*Model, error) {
	if !strings.HasSuffix(tarballName, ".tar.gz") {
		return nil, fmt.Errorf("given file should be a .tar.gz file")
	}
	cmd := exec.Command("tar", "xpf", tarballName, "-C", cwd, "./"+modelMetaFileName)
	out, err := cmd.CombinedOutput()
	if err != nil {
		return nil, fmt.Errorf("can't unzip model tarball %s: %s, %v", tarballName, out, err)
	}
	metaPath := path.Join(cwd, modelMetaFileName)
	defer os.Remove(metaPath)
	return loadMeta(metaPath)
}

func loadMeta(metaFileName string) (*Model, error) {
	data, err := ioutil.ReadFile(metaFileName)