go检查所有主机的时间同步

func checkTimeSync(s ssh.Interface, ipList []string) error {
   logger.Info("checker:timeSync %v", ipList)
   for _, ip := range ipList {
      timeStamp, err := s.CmdToString(ip, "date +%s", "")
      if err != nil {
         return fmt.Errorf("failed to get %s timestamp, %v", ip, err)
      }
      ts, err := strconv.Atoi(timeStamp)
      if err != nil {
         return fmt.Errorf("failed to reverse timestamp %s, %v", timeStamp, err)
      }
      timeDiff := time.Since(time.Unix(int64(ts), 0)).Minutes()
      if timeDiff < -1 || timeDiff > 1 {
         return fmt.Errorf("the time of %s node is not synchronized", ip)
      }
   }
   return nil
}