Fix the issue when docker exec a paused container, it will always hang.

Add the test case of this issue.

Docker-DCO-1.1-Signed-off-by: Chen Chao <cc272309126@gmail.com> (github: cc272309126)

daemon/exec.go

@@ -98,7 +98,9 @@ func (d *Daemon) getActiveContainer(name string) (*Container, error) {
 	if !container.IsRunning() {
 		return nil, fmt.Errorf("Container %s is not running", name)
 	}
-
+	if container.IsPaused() {
+		return nil, fmt.Errorf("Container %s is paused, unpause the container before exec", name)
+	}
 	return container, nil
 }
 

integration-cli/docker_cli_exec_test.go

@@ -230,3 +230,36 @@ func TestExecExitStatus(t *testing.T) {
 
 	logDone("exec - exec non-zero ExitStatus")
 }
+
+func TestExecPausedContainer(t *testing.T) {
+
+	defer deleteAllContainers()
+	defer unpauseAllContainers()
+
+	runCmd := exec.Command(dockerBinary, "run", "-d", "--name", "testing", "busybox", "top")
+	out, _, err := runCommandWithOutput(runCmd)
+	if err != nil {
+		t.Fatal(out, err)
+	}
+
+	ContainerID := stripTrailingCharacters(out)
+
+	pausedCmd := exec.Command(dockerBinary, "pause", "testing")
+	out, _, _, err = runCommandWithStdoutStderr(pausedCmd)
+	if err != nil {
+		t.Fatal(out, err)
+	}
+
+	execCmd := exec.Command(dockerBinary, "exec", "-i", "-t", ContainerID, "echo", "hello")
+	out, _, err = runCommandWithOutput(execCmd)
+	if err == nil {
+		t.Fatal("container should fail to exec new command if it is paused")
+	}
+
+	expected := ContainerID + " is paused, unpause the container before exec"
+	if !strings.Contains(out, expected) {
+		t.Fatal("container should not exec new command if it is paused")
+	}
+
+	logDone("exec - exec should not exec a pause container")
+}

integration-cli/docker_utils.go

@@ -328,6 +328,46 @@ func deleteAllContainers() error {
 	return nil
 }
 
+func getPausedContainers() (string, error) {
+	getPausedContainersCmd := exec.Command(dockerBinary, "ps", "-f", "status=paused", "-q", "-a")
+	out, exitCode, err := runCommandWithOutput(getPausedContainersCmd)
+	if exitCode != 0 && err == nil {
+		err = fmt.Errorf("failed to get a list of paused containers: %v\n", out)
+	}
+
+	return out, err
+}
+
+func unpauseContainer(container string) error {
+	unpauseCmd := exec.Command(dockerBinary, "unpause", container)
+	exitCode, err := runCommand(unpauseCmd)
+	if exitCode != 0 && err == nil {
+		err = fmt.Errorf("failed to unpause container")
+	}
+
+	return nil
+}
+
+func unpauseAllContainers() error {
+	containers, err := getPausedContainers()
+	if err != nil {
+		fmt.Println(containers)
+		return err
+	}
+
+	containers = strings.Replace(containers, "\n", " ", -1)
+	containers = strings.Trim(containers, " ")
+	containerList := strings.Split(containers, " ")
+
+	for _, value := range containerList {
+		if err = unpauseContainer(value); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
 func deleteImages(images ...string) error {
 	args := make([]string, 1, 2)
 	args[0] = "rmi"