code: func determineVersion() (string, error) {
  	out, err := exec.Command("build/bin/flynn-host", "version").CombinedOutput()
  	if err != nil {
  		return "", fmt.Errorf("error getting flynn-host version: %s: %s", err, out)
  	}
  	version := string(bytes.TrimSpace(out))
  	parts := strings.SplitN(version, "-", 2)
  	return parts[0], nil
  }
docs: // determineVersion determines the version by running 'flynn-host version',
  // potentially stripping off the '-<commit>' suffix