code: func loadClientVersion(path string) (string, error) {
  	blob, err := ioutil.ReadFile(path)
  	if err != nil {
  		return "", err
  	}
  	version := strings.TrimSpace(string(blob))
  	if err := common.ValidateInstanceVersion(version); err != nil {
  		return "", err
  	}
  	return version, nil
  }
docs: // loadClientVersion reads a version string from a file.