fix: make restart can restart stopped container

daemon/mgr/container.go

@@ -1160,20 +1160,19 @@ func (mgr *ContainerManager) Restart(ctx context.Context, name string, timeout i
 	c.Lock()
 	defer c.Unlock()
 
-	if !c.IsRunning() {
-		return fmt.Errorf("cannot restart a non running container")
-	}
-
 	if timeout == 0 {
 		timeout = c.StopTimeout()
 	}
 
-	// stop container
-	if err := mgr.stop(ctx, c, timeout); err != nil {
-		return errors.Wrapf(err, "failed to stop container")
+	if c.IsRunning() {
+		// stop container if it is running.
+		if err := mgr.stop(ctx, c, timeout); err != nil {
+			logrus.Errorf("failed to stop container %s when restarting: %v", c.ID(), err)
+			return errors.Wrapf(err, fmt.Sprintf("failed to stop container %s", c.ID()))
+		}
 	}
-	logrus.Debug("Restart: container " + c.ID() + "  stopped succeeded")
 
+	logrus.Debugf("start container %s when restarting", c.ID())
 	// start container
 	return mgr.start(ctx, c, "")
 }

test/api_container_restart_test.go

@@ -54,7 +54,7 @@ func (suite *APIContainerRestartSuite) TestAPIRestartStoppedContainer(c *check.C
 
 	resp, err := request.Post("/containers/"+cname+"/restart", query)
 	c.Assert(err, check.IsNil)
-	CheckRespStatus(c, resp, 500)
+	CheckRespStatus(c, resp, 204)
 
 	DelContainerForceOk(c, cname)
 }

test/cli_restart_test.go

@@ -34,7 +34,7 @@ func (suite *PouchRestartSuite) TearDownTest(c *check.C) {
 func (suite *PouchRestartSuite) TestPouchRestart(c *check.C) {
 	name := "TestPouchRestart"
 
-	command.PouchRun("run", "-d", "--cpu-share", "20", "--name", name, busyboxImage, "top").Assert(c, icmd.Success)
+	command.PouchRun("run", "-d", "--cpu-share", "20", "--name", name, busyboxImage).Assert(c, icmd.Success)
 
 	res := command.PouchRun("restart", "-t", "1", name)
 	c.Assert(res.Error, check.IsNil)
@@ -47,18 +47,14 @@ func (suite *PouchRestartSuite) TestPouchRestart(c *check.C) {
 }
 
 // TestPouchRestartStoppedContainer is to verify the correctness of restarting a stopped container.
+// Pouch should be compatible with moby's API. Restarting a stopped container is allowed.
 func (suite *PouchRestartSuite) TestPouchRestartStoppedContainer(c *check.C) {
 	name := "TestPouchRestartStoppedContainer"
 
 	command.PouchRun("create", "--name", name, busyboxImage).Assert(c, icmd.Success)
 
 	res := command.PouchRun("restart", "-t", "1", name)
-	c.Assert(res.Error, check.NotNil)
-
-	expectString := "cannot restart a non running container"
-	if out := res.Combined(); !strings.Contains(out, expectString) {
-		c.Fatalf("unexpected output: %s, expected: %s", out, expectString)
-	}
+	c.Assert(res.Error, check.IsNil)
 
 	command.PouchRun("rm", "-f", name).Assert(c, icmd.Success)
 }

test/cli_upgrade_test.go

@@ -82,7 +82,7 @@ func (suite *PouchUpgradeSuite) TestPouchUpgradeStoppedContainer(c *check.C) {
 	c.Assert(res.Error, check.IsNil)
 
 	if out := res.Combined(); !strings.Contains(out, name) {
-		c.Fatal("unexpected output: %s, expected %s", out, name)
+		c.Fatalf("unexpected output: %s, expected %s", out, name)
 	}
 
 	command.PouchRun("start", name).Assert(c, icmd.Success)