vendor: add github.com/okzk/sdnotify

vendor/github.com/okzk/sdnotify/sample/main.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"github.com/okzk/sdnotify"
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+)
+
+func reload() {
+	// Tells the service manager that the service is reloading its configuration.
+	sdnotify.SdNotifyReloading()
+
+	log.Println("reloading...")
+	time.Sleep(time.Second)
+	log.Println("reloaded.")
+
+	// The service must also send a "READY" notification when it completed reloading its configuration.
+	sdnotify.SdNotifyReady()
+}
+
+func main() {
+	log.Println("starting...")
+	time.Sleep(time.Second)
+	log.Println("started.")
+
+	// Tells the service manager that service startup is finished.
+	sdnotify.SdNotifyReady()
+
+	sigCh := make(chan os.Signal, 1)
+	signal.Notify(sigCh, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)
+	for sig := range sigCh {
+		if sig == syscall.SIGHUP {
+			reload()
+		} else {
+			break
+		}
+	}
+
+	// Tells the service manager that the service is beginning its shutdown.
+	sdnotify.SdNotifyStopping()
+
+	log.Println("existing...")
+	time.Sleep(time.Second)
+}

vendor/github.com/okzk/sdnotify/sample/sample.service

@@ -0,0 +1,11 @@
+[Unit]
+Description=sample
+
+[Service]
+Type=notify
+ExecStart=/path/to/sample
+ExecStop=/bin/kill -SIGTERM $MAINPID
+ExecReload=/bin/kill -SIGHUP $MAINPID
+
+[Install]
+WantedBy = multi-user.target