code: func doMount(source string, target string, fstype string, options []string) error {
  	glog.V(5).Infof("Mounting %s %s %s %v", source, target, fstype, options)
  	mountArgs := makeMountArgs(source, target, fstype, options)
  	command := exec.Command("mount", mountArgs...)
  	output, err := command.CombinedOutput()
  	if err != nil {
  		return fmt.Errorf("Mount failed: %v\nMounting arguments: %s %s %s %v\nOutput: %s\n",
  			err, source, target, fstype, options, string(output))
  	}
  	return err
  }
docs: // doMount runs the mount command.