code: func GetOperatingSystem() (string, error) {
  	osReleaseFile, err := os.Open(etcOsRelease)
  	if err != nil {
  		if !os.IsNotExist(err) {
  			return "", fmt.Errorf("Error opening %s: %v", etcOsRelease, err)
  		}
  		osReleaseFile, err = os.Open(altOsRelease)
  		if err != nil {
  			return "", fmt.Errorf("Error opening %s: %v", altOsRelease, err)
  		}
  	}
  	defer osReleaseFile.Close()
  
  	var prettyName string
  	scanner := bufio.NewScanner(osReleaseFile)
  	for scanner.Scan() {
  		line := scanner.Text()
  		if strings.HasPrefix(line, "PRETTY_NAME=") {
  			data := strings.SplitN(line, "=", 2)
  			prettyNames, err := shellwords.Parse(data[1])
  			if err != nil {
  				return "", fmt.Errorf("PRETTY_NAME is invalid: %s", err.Error())
  			}
  			if len(prettyNames) != 1 {
  				return "", fmt.Errorf("PRETTY_NAME needs to be enclosed by quotes if they have spaces: %s", data[1])
  			}
  			prettyName = prettyNames[0]
  		}
  	}
  	if prettyName != "" {
  		return prettyName, nil
  	}
  	// If not set, defaults to PRETTY_NAME="Linux"
  	// c.f. http://www.freedesktop.org/software/systemd/man/os-release.html
  	return "Linux", nil
  }
docs: // GetOperatingSystem gets the name of the current operating system.