如果系统安装了ntpdate，则自动尝试利用ntpdate同步时间

internal/utils/clock/utils.go

@@ -0,0 +1,57 @@
+// Copyright 2022 Liuxiangchao iwind.liu@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package clock
+
+import (
+	"bytes"
+	"errors"
+	"github.com/TeaOSLab/EdgeNode/internal/remotelogs"
+	"os/exec"
+	"runtime"
+	"time"
+)
+
+func Start() {
+	// sync once
+	err := Sync()
+	if err != nil {
+		remotelogs.Warn("CLOCK", "sync time clock failed: "+err.Error())
+	}
+
+	var ticker = time.NewTicker(1 * time.Hour)
+	for range ticker.C {
+		err := Sync()
+		if err != nil {
+			// ignore error
+		}
+	}
+}
+
+// Sync 自动校对时间
+func Sync() error {
+	if runtime.GOOS != "linux" {
+		return nil
+	}
+
+	ntpdate, err := exec.LookPath("ntpdate")
+	if err != nil {
+		return err
+	}
+	if len(ntpdate) > 0 {
+		return syncNtpdate(ntpdate)
+	}
+
+	return nil
+}
+
+func syncNtpdate(ntpdate string) error {
+	var cmd = exec.Command(ntpdate, "pool.ntp.org")
+	var stderr = &bytes.Buffer{}
+	cmd.Stderr = stderr
+	err := cmd.Run()
+	if err != nil {
+		return errors.New(err.Error() + ": " + stderr.String())
+	}
+
+	return nil
+}