func TestServiceFile(t *testing.T) {
	if !sd_util.IsRunningSystemd() {
		t.Skip("Systemd is not running on the host.")
	}

	ctx := newRktRunCtx()
	defer ctx.cleanup()

	r := rand.New(rand.NewSource(time.Now().UnixNano()))

	conn, err := sd_dbus.New()
	if err != nil {
		t.Fatal(err)
	}

	imageFile := os.Getenv("RKT_INSPECT_IMAGE")
	if imageFile == "" {
		t.Fatal("RKT_INSPECT_IMAGE is not set")
	}
	image, err := filepath.Abs(imageFile)
	if err != nil {
		t.Fatal(err)
	}
	opts := "-- --print-msg=HelloWorld --sleep=1000"

	cmd := fmt.Sprintf("%s --insecure-skip-verify run --mds-register=false --set-env=MESSAGE_LOOP=1000 %s %s", ctx.cmd(), image, opts)
	props := []sd_dbus.Property{
		sd_dbus.PropExecStart(strings.Split(cmd, " "), false),
	}
	target := fmt.Sprintf("rkt-testing-transient-%d.service", r.Int())

	reschan := make(chan string)
	_, err = conn.StartTransientUnit(target, "replace", props, reschan)
	if err != nil {
		t.Fatal(err)
	}

	job := <-reschan
	if job != "done" {
		t.Fatal("Job is not done:", job)
	}

	units, err := conn.ListUnits()

	var found bool
	for _, u := range units {
		if u.Name == target {
			found = true
			if u.ActiveState != "active" {
				t.Fatalf("Test unit %s not active: %s (target: %s)", u.Name, u.ActiveState, target)
			}
		}
	}

	if !found {
		t.Fatalf("Test unit not found in list")
	}

	// Run the unit for 10 seconds. You can check the logs manually in journalctl
	time.Sleep(10 * time.Second)

	// Stop the unit
	_, err = conn.StopUnit(target, "replace", reschan)
	if err != nil {
		t.Fatal(err)
	}

	// wait for StopUnit job to complete
	<-reschan

	units, err = conn.ListUnits()

	found = false
	for _, u := range units {
		if u.Name == target {
			found = true
		}
	}

	if found {
		t.Fatalf("Test unit found in list, should be stopped")
	}
}
func TestSocketActivation(t *testing.T) {
	if !sd_util.IsRunningSystemd() {
		t.Skip("Systemd is not running on the host.")
	}

	r := rand.New(rand.NewSource(time.Now().UnixNano()))

	port, err := randomFreePort(t)
	if err != nil {
		t.Fatal(err)
	}

	echoImage := patchTestACI("rkt-inspect-echo.aci",
		"--exec=/echo-socket-activated",
		fmt.Sprintf("--ports=%d-tcp,protocol=tcp,port=%d,socketActivated=true", port, port))
	defer os.Remove(echoImage)

	ctx := testutils.NewRktRunCtx()
	defer ctx.Cleanup()

	conn, err := sd_dbus.New()
	if err != nil {
		t.Fatal(err)
	}

	rktTestingEchoService := `
	[Unit]
	Description=Socket-activated echo server

	[Service]
	ExecStart=%s
	KillMode=process
	`

	rnd := r.Int()

	// Write unit files directly to runtime system units directory
	// (/run/systemd/system) to avoid calling LinkUnitFiles - it is buggy in
	// systemd v219 as it does not work with absolute paths.
	unitsDir := "/run/systemd/system"

	cmd := fmt.Sprintf("%s --insecure-skip-verify run --mds-register=false %s", ctx.Cmd(), echoImage)
	serviceContent := fmt.Sprintf(rktTestingEchoService, cmd)
	serviceTargetBase := fmt.Sprintf("rkt-testing-socket-activation-%d.service", rnd)
	serviceTarget := filepath.Join(unitsDir, serviceTargetBase)

	if err := ioutil.WriteFile(serviceTarget, []byte(serviceContent), 0666); err != nil {
		t.Fatal(err)
	}
	defer os.Remove(serviceTarget)

	rktTestingEchoSocket := `
	[Unit]
	Description=Socket-activated netcat server socket

	[Socket]
	ListenStream=%d
	`
	socketContent := fmt.Sprintf(rktTestingEchoSocket, port)
	socketTargetBase := fmt.Sprintf("rkt-testing-socket-activation-%d.socket", rnd)
	socketTarget := filepath.Join(unitsDir, socketTargetBase)

	if err := ioutil.WriteFile(socketTarget, []byte(socketContent), 0666); err != nil {
		t.Fatal(err)
	}
	defer os.Remove(socketTarget)

	reschan := make(chan string)
	doJob := func() {
		job := <-reschan
		if job != "done" {
			t.Fatal("Job is not done:", job)
		}
	}

	if _, err := conn.StartUnit(socketTargetBase, "replace", reschan); err != nil {
		t.Fatal(err)
	}
	doJob()

	defer func() {
		if _, err := conn.StopUnit(socketTargetBase, "replace", reschan); err != nil {
			t.Fatal(err)
		}
		doJob()

		if _, err := conn.StopUnit(serviceTargetBase, "replace", reschan); err != nil {
			t.Fatal(err)
		}
		doJob()
	}()

	expected := "HELO\n"
	sockConn, err := net.Dial("tcp", fmt.Sprintf("localhost:%d", port))
	if err != nil {
		t.Fatal(err)
	}

	if _, err := fmt.Fprintf(sockConn, expected); err != nil {
		t.Fatal(err)
	}

	answer, err := bufio.NewReader(sockConn).ReadString('\n')
	if err != nil {
		t.Fatal(err)
	}

	if answer != expected {
		t.Fatalf("Expected %q, Got %q", expected, answer)
	}

	return
}