Golang util.DecodeDeploymentConfig函数代码示例

func (e *HookExecutor) emitEvent(deployment *kapi.ReplicationController, eventType, reason, msg string) {
	t := unversioned.Time{Time: time.Now()}
	var ref *kapi.ObjectReference
	if config, err := deployutil.DecodeDeploymentConfig(deployment, e.decoder); err != nil {
		glog.Errorf("Unable to decode deployment %s/%s to replication contoller: %v", deployment.Namespace, deployment.Name, err)
		if ref, err = kapi.GetReference(deployment); err != nil {
			glog.Errorf("Unable to get reference for %#v: %v", deployment, err)
			return
		}
	} else {
		if ref, err = kapi.GetReference(config); err != nil {
			glog.Errorf("Unable to get reference for %#v: %v", config, err)
			return
		}
	}
	event := &kapi.Event{
		ObjectMeta: kapi.ObjectMeta{
			Name:      fmt.Sprintf("%v.%x", ref.Name, t.UnixNano()),
			Namespace: ref.Namespace,
		},
		InvolvedObject: *ref,
		Reason:         reason,
		Message:        msg,
		FirstTimestamp: t,
		LastTimestamp:  t,
		Count:          1,
		Type:           eventType,
	}
	if _, err := e.events.Create(event); err != nil {
		glog.Errorf("Could not send event '%#v': %v", event, err)
	}
}

// TestHandle_waitForImageController tests an initial deployment with unresolved image. The config
// change controller should never increment latestVersion, thus trigger a deployment for this config.
func TestHandle_waitForImageController(t *testing.T) {
	fake := &testclient.Fake{}
	kFake := &ktestclient.Fake{}

	fake.PrependReactor("update", "deploymentconfigs/status", func(action ktestclient.Action) (handled bool, ret runtime.Object, err error) {
		t.Fatalf("an update should never run before the template image is resolved")
		return true, nil, nil
	})

	controller := &DeploymentConfigChangeController{
		client:  fake,
		kClient: kFake,
		decodeConfig: func(deployment *kapi.ReplicationController) (*deployapi.DeploymentConfig, error) {
			return deployutil.DecodeDeploymentConfig(deployment, kapi.Codecs.LegacyCodec(deployapi.SchemeGroupVersion))
		},
	}

	config := testapi.OkDeploymentConfig(0)
	config.Namespace = kapi.NamespaceDefault
	config.Spec.Triggers = []deployapi.DeploymentTriggerPolicy{testapi.OkConfigChangeTrigger(), testapi.OkImageChangeTrigger()}

	if err := controller.Handle(config); err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
}

func (c *DeploymentController) emitDeploymentEvent(deployment *kapi.ReplicationController, eventType, title, message string) {
	if config, _ := deployutil.DecodeDeploymentConfig(deployment, c.codec); config != nil {
		c.recorder.Eventf(config, eventType, title, fmt.Sprintf("%s: %s", deployment.Name, message))
	} else {
		c.recorder.Eventf(deployment, eventType, title, message)
	}
}

// TestHandle_newConfigNoTriggers ensures that a change to a config with no
// triggers doesn't result in a new config version bump.
func TestHandle_newConfigNoTriggers(t *testing.T) {
	controller := &DeploymentConfigChangeController{
		decodeConfig: func(deployment *kapi.ReplicationController) (*deployapi.DeploymentConfig, error) {
			return deployutil.DecodeDeploymentConfig(deployment, api.Codec)
		},
		changeStrategy: &changeStrategyImpl{
			generateDeploymentConfigFunc: func(namespace, name string) (*deployapi.DeploymentConfig, error) {
				t.Fatalf("unexpected generation of deploymentConfig")
				return nil, nil
			},
			updateDeploymentConfigFunc: func(namespace string, config *deployapi.DeploymentConfig) (*deployapi.DeploymentConfig, error) {
				t.Fatalf("unexpected update of deploymentConfig")
				return config, nil
			},
		},
	}

	config := deployapitest.OkDeploymentConfig(1)
	config.Spec.Triggers = []deployapi.DeploymentTriggerPolicy{}
	err := controller.Handle(config)

	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
}

// RecordConfigEvent records an event for the deployment config referenced by the
// deployment.
func RecordConfigEvent(client kclient.EventNamespacer, deployment *kapi.ReplicationController, decoder runtime.Decoder, eventType, reason, msg string) {
	t := unversioned.Time{Time: time.Now()}
	var obj runtime.Object = deployment
	if config, err := deployutil.DecodeDeploymentConfig(deployment, decoder); err == nil {
		obj = config
	} else {
		glog.Errorf("Unable to decode deployment config from %s/%s: %v", deployment.Namespace, deployment.Name, err)
	}
	ref, err := kapi.GetReference(obj)
	if err != nil {
		glog.Errorf("Unable to get reference for %#v: %v", obj, err)
		return
	}
	event := &kapi.Event{
		ObjectMeta: kapi.ObjectMeta{
			Name:      fmt.Sprintf("%v.%x", ref.Name, t.UnixNano()),
			Namespace: ref.Namespace,
		},
		InvolvedObject: *ref,
		Reason:         reason,
		Message:        msg,
		Source: kapi.EventSource{
			Component: deployutil.DeployerPodNameFor(deployment),
		},
		FirstTimestamp: t,
		LastTimestamp:  t,
		Count:          1,
		Type:           eventType,
	}
	if _, err := client.Events(ref.Namespace).Create(event); err != nil {
		glog.Errorf("Could not create event '%#v': %v", event, err)
	}
}

// makeDeployerPod creates a pod which implements deployment behavior. The pod is correlated to
// the deployment with an annotation.
func (c *DeploymentController) makeDeployerPod(deployment *kapi.ReplicationController) (*kapi.Pod, error) {
	deploymentConfig, err := deployutil.DecodeDeploymentConfig(deployment, c.codec)
	if err != nil {
		return nil, err
	}

	container := c.makeDeployerContainer(&deploymentConfig.Spec.Strategy)

	// Add deployment environment variables to the container.
	envVars := []kapi.EnvVar{}
	for _, env := range container.Env {
		envVars = append(envVars, env)
	}
	envVars = append(envVars, kapi.EnvVar{Name: "OPENSHIFT_DEPLOYMENT_NAME", Value: deployment.Name})
	envVars = append(envVars, kapi.EnvVar{Name: "OPENSHIFT_DEPLOYMENT_NAMESPACE", Value: deployment.Namespace})

	// Assigning to a variable since its address is required
	maxDeploymentDurationSeconds := deployapi.MaxDeploymentDurationSeconds

	pod := &kapi.Pod{
		ObjectMeta: kapi.ObjectMeta{
			Name: deployutil.DeployerPodNameForDeployment(deployment.Name),
			Annotations: map[string]string{
				deployapi.DeploymentAnnotation: deployment.Name,
			},
			Labels: map[string]string{
				deployapi.DeployerPodForDeploymentLabel: deployment.Name,
			},
		},
		Spec: kapi.PodSpec{
			Containers: []kapi.Container{
				{
					Name:      "deployment",
					Command:   container.Command,
					Args:      container.Args,
					Image:     container.Image,
					Env:       envVars,
					Resources: deploymentConfig.Spec.Strategy.Resources,
				},
			},
			ActiveDeadlineSeconds: &maxDeploymentDurationSeconds,
			DNSPolicy:             deployment.Spec.Template.Spec.DNSPolicy,
			ImagePullSecrets:      deployment.Spec.Template.Spec.ImagePullSecrets,
			// Setting the node selector on the deployer pod so that it is created
			// on the same set of nodes as the pods.
			NodeSelector:       deployment.Spec.Template.Spec.NodeSelector,
			RestartPolicy:      kapi.RestartPolicyNever,
			ServiceAccountName: c.serviceAccount,
		},
	}

	// MergeInfo will not overwrite values unless the flag OverwriteExistingDstKey is set.
	util.MergeInto(pod.Labels, deploymentConfig.Spec.Strategy.Labels, 0)
	util.MergeInto(pod.Annotations, deploymentConfig.Spec.Strategy.Annotations, 0)

	pod.Spec.Containers[0].ImagePullPolicy = kapi.PullIfNotPresent

	return pod, nil
}

// TestHandle_cleanupDesiredReplicasAnnotation ensures that the desired replicas annotation
// will be cleaned up in a complete deployment and stay around in a failed deployment
func TestHandle_cleanupDesiredReplicasAnnotation(t *testing.T) {
	// shared fixtures shouldn't be used in unit tests
	shared, _ := deployutil.MakeDeployment(deploytest.OkDeploymentConfig(1), kapi.Codecs.LegacyCodec(deployapi.SchemeGroupVersion))

	tests := []struct {
		name     string
		pod      *kapi.Pod
		expected bool
	}{
		{
			name:     "complete deployment - cleaned up annotation",
			pod:      succeededPod(shared),
			expected: false,
		},
		{
			name:     "failed deployment - annotation stays",
			pod:      terminatedPod(shared),
			expected: true,
		},
	}

	for _, test := range tests {
		deployment, _ := deployutil.MakeDeployment(deploytest.OkDeploymentConfig(1), kapi.Codecs.LegacyCodec(deployapi.SchemeGroupVersion))
		var updatedDeployment *kapi.ReplicationController
		deployment.Annotations[deployapi.DesiredReplicasAnnotation] = "1"

		kFake := &ktestclient.Fake{}
		kFake.PrependReactor("get", "replicationcontrollers", func(action ktestclient.Action) (handled bool, ret runtime.Object, err error) {
			return true, deployment, nil
		})
		kFake.PrependReactor("update", "replicationcontrollers", func(action ktestclient.Action) (handled bool, ret runtime.Object, err error) {
			updatedDeployment = deployment
			return true, deployment, nil
		})

		controller := &DeployerPodController{
			decodeConfig: func(deployment *kapi.ReplicationController) (*deployapi.DeploymentConfig, error) {
				return deployutil.DecodeDeploymentConfig(deployment, kapi.Codecs.UniversalDecoder())
			},
			store:   cache.NewStore(cache.MetaNamespaceKeyFunc),
			kClient: kFake,
		}

		if err := controller.Handle(test.pod); err != nil {
			t.Errorf("%s: unexpected error: %v", test.name, err)
			continue
		}

		if updatedDeployment == nil {
			t.Errorf("%s: expected deployment update", test.name)
			continue
		}

		if _, got := updatedDeployment.Annotations[deployapi.DesiredReplicasAnnotation]; got != test.expected {
			t.Errorf("%s: expected annotation: %t, got %t", test.name, test.expected, got)
		}
	}
}

// TestHandle_cleanupPodOk ensures that deployer pods are cleaned up for
// deployments in a completed state.
func TestHandle_cleanupPodOk(t *testing.T) {
	deployerPodNames := []string{"pod1", "pod2", "pod3"}
	deletedPodNames := []string{}

	controller := &DeploymentController{
		decodeConfig: func(deployment *kapi.ReplicationController) (*deployapi.DeploymentConfig, error) {
			return deployutil.DecodeDeploymentConfig(deployment, api.Codec)
		},
		deploymentClient: &deploymentClientImpl{
			updateDeploymentFunc: func(namespace string, deployment *kapi.ReplicationController) (*kapi.ReplicationController, error) {
				t.Fatalf("unexpected deployment update")
				return nil, nil
			},
		},
		podClient: &podClientImpl{
			createPodFunc: func(namespace string, pod *kapi.Pod) (*kapi.Pod, error) {
				t.Fatalf("unexpected call to create pod")
				return nil, nil
			},
			deletePodFunc: func(namespace, name string) error {
				deletedPodNames = append(deletedPodNames, name)
				return nil
			},
			getDeployerPodsForFunc: func(namespace, name string) ([]kapi.Pod, error) {
				pods := []kapi.Pod{}
				for _, podName := range deployerPodNames {
					pod := *ttlNonZeroPod()
					pod.Name = podName
					pods = append(pods, pod)
				}
				return pods, nil
			},
		},
		makeContainer: func(strategy *deployapi.DeploymentStrategy) (*kapi.Container, error) {
			t.Fatalf("unexpected call to make container")
			return nil, nil
		},
		recorder: &record.FakeRecorder{},
	}

	// Verify successful cleanup
	config := deploytest.OkDeploymentConfig(1)
	deployment, _ := deployutil.MakeDeployment(config, kapi.Codec)
	deployment.Annotations[deployapi.DeploymentStatusAnnotation] = string(deployapi.DeploymentStatusComplete)
	err := controller.Handle(deployment)

	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	sort.Strings(deployerPodNames)
	sort.Strings(deletedPodNames)
	if !reflect.DeepEqual(deletedPodNames, deletedPodNames) {
		t.Fatalf("pod deletions - expected: %v, actual: %v", deployerPodNames, deletedPodNames)
	}

}

// TestHandle_cleanupDesiredReplicasAnnotation ensures that the desired replicas annotation
// will be cleaned up in a complete deployment and stay around in a failed deployment
func TestHandle_cleanupDesiredReplicasAnnotation(t *testing.T) {
	deployment, _ := deployutil.MakeDeployment(deploytest.OkDeploymentConfig(1), kapi.Codec)

	tests := []struct {
		name     string
		pod      *kapi.Pod
		expected bool
	}{
		{
			name:     "complete deployment - cleaned up annotation",
			pod:      succeededPod(deployment),
			expected: false,
		},
		{
			name:     "failed deployment - annotation stays",
			pod:      terminatedPod(deployment),
			expected: true,
		},
	}

	for _, test := range tests {
		var updatedDeployment *kapi.ReplicationController
		deployment.Annotations[deployapi.DesiredReplicasAnnotation] = "1"

		controller := &DeployerPodController{
			decodeConfig: func(deployment *kapi.ReplicationController) (*deployapi.DeploymentConfig, error) {
				return deployutil.DecodeDeploymentConfig(deployment, kapi.Codec)
			},
			deploymentClient: &deploymentClientImpl{
				getDeploymentFunc: func(namespace, name string) (*kapi.ReplicationController, error) {
					return deployment, nil
				},
				updateDeploymentFunc: func(namespace string, deployment *kapi.ReplicationController) (*kapi.ReplicationController, error) {
					updatedDeployment = deployment
					return deployment, nil
				},
				listDeploymentsForConfigFunc: func(namespace, configName string) (*kapi.ReplicationControllerList, error) {
					return &kapi.ReplicationControllerList{Items: []kapi.ReplicationController{*deployment}}, nil
				},
			},
		}

		if err := controller.Handle(test.pod); err != nil {
			t.Errorf("%s: unexpected error: %v", test.name, err)
			continue
		}

		if updatedDeployment == nil {
			t.Errorf("%s: expected deployment update", test.name)
			continue
		}

		if _, got := updatedDeployment.Annotations[deployapi.DesiredReplicasAnnotation]; got != test.expected {
			t.Errorf("%s: expected annotation: %t, got %t", test.name, test.expected, got)
		}
	}
}

// TestHandle_cleanupPendingRunning ensures that deployer pods are deleted
// for deployments in post-New phases.
func TestHandle_cleanupPendingRunning(t *testing.T) {
	deployerPodCount := 3
	deletedPods := 0

	controller := &DeploymentController{
		decodeConfig: func(deployment *kapi.ReplicationController) (*deployapi.DeploymentConfig, error) {
			return deployutil.DecodeDeploymentConfig(deployment, kapi.Codecs.LegacyCodec(deployapi.SchemeGroupVersion))
		},
		deploymentClient: &deploymentClientImpl{
			updateDeploymentFunc: func(namespace string, deployment *kapi.ReplicationController) (*kapi.ReplicationController, error) {
				// None of these tests should transition the phase.
				t.Errorf("unexpected call to updateDeployment")
				return nil, nil
			},
		},
		podClient: &podClientImpl{
			getPodFunc: func(namespace, name string) (*kapi.Pod, error) {
				return ttlNonZeroPod(), nil
			},
			deletePodFunc: func(namespace, name string) error {
				deletedPods++
				return nil
			},
			getDeployerPodsForFunc: func(namespace, name string) ([]kapi.Pod, error) {
				pods := []kapi.Pod{}
				for i := 0; i < deployerPodCount; i++ {
					pods = append(pods, *ttlNonZeroPod())
				}
				return pods, nil
			},
		},
		makeContainer: func(strategy *deployapi.DeploymentStrategy) *kapi.Container {
			return okContainer()
		},
		recorder: &record.FakeRecorder{},
	}

	cases := []deployapi.DeploymentStatus{
		deployapi.DeploymentStatusPending,
		deployapi.DeploymentStatusRunning,
	}

	for _, status := range cases {
		deletedPods = 0
		deployment, _ := deployutil.MakeDeployment(deploytest.OkDeploymentConfig(1), kapi.Codecs.LegacyCodec(deployapi.SchemeGroupVersion))
		deployment.Annotations[deployapi.DeploymentStatusAnnotation] = string(status)
		deployment.Annotations[deployapi.DeploymentCancelledAnnotation] = deployapi.DeploymentCancelledAnnotationValue
		err := controller.Handle(deployment)
		if err != nil {
			t.Fatalf("unexpected error: %v", err)
		}

		if e, a := deletedPods, deployerPodCount; e != a {
			t.Fatalf("expected %d deleted pods, got %d", e, a)
		}
	}
}

// Create creates a DeploymentConfigChangeController.
func (factory *DeploymentConfigChangeControllerFactory) Create() controller.RunnableController {
	deploymentConfigLW := &deployutil.ListWatcherImpl{
		ListFunc: func() (runtime.Object, error) {
			return factory.Client.DeploymentConfigs(kapi.NamespaceAll).List(labels.Everything(), fields.Everything())
		},
		WatchFunc: func(resourceVersion string) (watch.Interface, error) {
			return factory.Client.DeploymentConfigs(kapi.NamespaceAll).Watch(labels.Everything(), fields.Everything(), resourceVersion)
		},
	}
	queue := cache.NewFIFO(cache.MetaNamespaceKeyFunc)
	cache.NewReflector(deploymentConfigLW, &deployapi.DeploymentConfig{}, queue, 2*time.Minute).Run()

	eventBroadcaster := record.NewBroadcaster()
	eventBroadcaster.StartRecordingToSink(factory.KubeClient.Events(""))

	changeController := &DeploymentConfigChangeController{
		changeStrategy: &changeStrategyImpl{
			getDeploymentFunc: func(namespace, name string) (*kapi.ReplicationController, error) {
				return factory.KubeClient.ReplicationControllers(namespace).Get(name)
			},
			generateDeploymentConfigFunc: func(namespace, name string) (*deployapi.DeploymentConfig, error) {
				return factory.Client.DeploymentConfigs(namespace).Generate(name)
			},
			updateDeploymentConfigFunc: func(namespace string, config *deployapi.DeploymentConfig) (*deployapi.DeploymentConfig, error) {
				return factory.Client.DeploymentConfigs(namespace).Update(config)
			},
		},
		decodeConfig: func(deployment *kapi.ReplicationController) (*deployapi.DeploymentConfig, error) {
			return deployutil.DecodeDeploymentConfig(deployment, factory.Codec)
		},
		recorder: eventBroadcaster.NewRecorder(kapi.EventSource{Component: "deployer"}),
	}

	return &controller.RetryController{
		Queue: queue,
		RetryManager: controller.NewQueueRetryManager(
			queue,
			cache.MetaNamespaceKeyFunc,
			func(obj interface{}, err error, retries controller.Retry) bool {
				kutil.HandleError(err)
				if _, isFatal := err.(fatalError); isFatal {
					return false
				}
				if retries.Count > 0 {
					return false
				}
				return true
			},
			kutil.NewTokenBucketRateLimiter(1, 10),
		),
		Handle: func(obj interface{}) error {
			config := obj.(*deployapi.DeploymentConfig)
			return changeController.Handle(config)
		},
	}
}

// TestHandle_canceledDeploymentTrigger ensures that a canceled deployment
// will trigger a reconcilation of its deploymentconfig (via an annotation
// update) so that rolling back can happen on the spot and not rely on the
// deploymentconfig cache resync interval.
func TestHandle_canceledDeploymentTriggerTest(t *testing.T) {
	var (
		updatedDeployment *kapi.ReplicationController
		updatedConfig     *deployapi.DeploymentConfig
	)

	initial := deploytest.OkDeploymentConfig(1)
	// Canceled deployment
	deployment, _ := deployutil.MakeDeployment(deploytest.TestDeploymentConfig(initial), kapi.Codecs.LegacyCodec(deployapi.SchemeGroupVersion))
	deployment.Annotations[deployapi.DeploymentCancelledAnnotation] = deployapi.DeploymentCancelledAnnotationValue

	kFake := &ktestclient.Fake{}
	kFake.PrependReactor("get", "replicationcontrollers", func(action ktestclient.Action) (handled bool, ret runtime.Object, err error) {
		return true, deployment, nil
	})
	kFake.PrependReactor("update", "replicationcontrollers", func(action ktestclient.Action) (handled bool, ret runtime.Object, err error) {
		updatedDeployment = deployment
		return true, deployment, nil
	})
	fake := &testclient.Fake{}
	fake.PrependReactor("get", "deploymentconfigs", func(action ktestclient.Action) (handled bool, ret runtime.Object, err error) {
		config := initial
		return true, config, nil
	})
	fake.PrependReactor("update", "deploymentconfigs", func(action ktestclient.Action) (handled bool, ret runtime.Object, err error) {
		updated := action.(ktestclient.UpdateAction).GetObject().(*deployapi.DeploymentConfig)
		updatedConfig = updated
		return true, updated, nil
	})

	controller := &DeployerPodController{
		decodeConfig: func(deployment *kapi.ReplicationController) (*deployapi.DeploymentConfig, error) {
			return deployutil.DecodeDeploymentConfig(deployment, kapi.Codecs.UniversalDecoder())
		},
		store:   cache.NewStore(cache.MetaNamespaceKeyFunc),
		client:  fake,
		kClient: kFake,
	}

	err := controller.Handle(terminatedPod(deployment))
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if updatedDeployment == nil {
		t.Fatalf("expected deployment update")
	}

	if e, a := deployapi.DeploymentStatusFailed, deployutil.DeploymentStatusFor(updatedDeployment); e != a {
		t.Fatalf("expected updated deployment status %s, got %s", e, a)
	}

	if updatedConfig == nil {
		t.Fatalf("expected config update")
	}
}

func TestDeployerCustomLabelsAndAnnotations(t *testing.T) {
	controller := &DeploymentController{
		decodeConfig: func(deployment *kapi.ReplicationController) (*deployapi.DeploymentConfig, error) {
			return deployutil.DecodeDeploymentConfig(deployment, api.Codec)
		},
		podClient: &podClientImpl{
			createPodFunc: func(namespace string, pod *kapi.Pod) (*kapi.Pod, error) {
				return pod, nil
			},
		},
		makeContainer: func(strategy *deployapi.DeploymentStrategy) (*kapi.Container, error) {
			return okContainer(), nil
		},
	}

	testCases := []struct {
		name         string
		strategy     deployapi.DeploymentStrategy
		labels       map[string]string
		annotations  map[string]string
		verifyLabels bool
	}{
		{name: "labels and annotations", strategy: deploytest.OkStrategy(), labels: map[string]string{"label1": "value1"}, annotations: map[string]string{"annotation1": "value1"}, verifyLabels: true},
		{name: "custom strategy, no annotations", strategy: deploytest.OkCustomStrategy(), labels: map[string]string{"label2": "value2", "label3": "value3"}, verifyLabels: true},
		{name: "custom strategy, no labels", strategy: deploytest.OkCustomStrategy(), annotations: map[string]string{"annotation3": "value3"}, verifyLabels: true},
		{name: "no overrride", strategy: deploytest.OkStrategy(), labels: map[string]string{deployapi.DeployerPodForDeploymentLabel: "ignored"}, verifyLabels: false},
	}

	for _, test := range testCases {
		t.Logf("evaluating test case %s", test.name)
		config := deploytest.OkDeploymentConfig(1)
		config.Spec.Strategy = test.strategy
		config.Spec.Strategy.Labels = test.labels
		config.Spec.Strategy.Annotations = test.annotations

		deployment, _ := deployutil.MakeDeployment(config, kapi.Codec)
		podTemplate, err := controller.makeDeployerPod(deployment)
		if err != nil {
			t.Fatal(err)
		}

		nameLabel, ok := podTemplate.Labels[deployapi.DeployerPodForDeploymentLabel]
		if ok && nameLabel != deployment.Name {
			t.Errorf("label %s expected %s, got %s", deployapi.DeployerPodForDeploymentLabel, deployment.Name, nameLabel)
		} else if !ok {
			t.Errorf("label %s not present", deployapi.DeployerPodForDeploymentLabel)
		}
		if test.verifyLabels {
			expectMapContains(t, podTemplate.Labels, test.labels, "labels")
		}
		expectMapContains(t, podTemplate.Annotations, test.annotations, "annotations")
	}
}

// Create generates a new DeploymentConfig representing a rollback.
func (r *REST) Create(ctx kapi.Context, obj runtime.Object) (runtime.Object, error) {
	namespace, ok := kapi.NamespaceFrom(ctx)
	if !ok {
		return nil, kerrors.NewBadRequest("namespace parameter required.")
	}
	rollback, ok := obj.(*deployapi.DeploymentConfigRollback)
	if !ok {
		return nil, kerrors.NewBadRequest(fmt.Sprintf("not a rollback spec: %#v", obj))
	}

	if errs := validation.ValidateDeploymentConfigRollback(rollback); len(errs) > 0 {
		return nil, kerrors.NewInvalid(deployapi.Kind("DeploymentConfigRollback"), rollback.Name, errs)
	}

	from, err := r.dn.DeploymentConfigs(namespace).Get(rollback.Name)
	if err != nil {
		return nil, newInvalidError(rollback, fmt.Sprintf("cannot get deployment config %q: %v", rollback.Name, err))
	}

	switch from.Status.LatestVersion {
	case 0:
		return nil, newInvalidError(rollback, "cannot rollback an undeployed config")
	case 1:
		return nil, newInvalidError(rollback, fmt.Sprintf("no previous deployment exists for %q", deployutil.LabelForDeploymentConfig(from)))
	}

	revision := from.Status.LatestVersion - 1
	if rollback.Spec.Revision > 0 {
		revision = rollback.Spec.Revision
	}

	// Find the target deployment and decode its config.
	name := deployutil.DeploymentNameForConfigVersion(from.Name, revision)
	targetDeployment, err := r.rn.ReplicationControllers(namespace).Get(name)
	if err != nil {
		return nil, newInvalidError(rollback, err.Error())
	}

	to, err := deployutil.DecodeDeploymentConfig(targetDeployment, r.codec)
	if err != nil {
		return nil, newInvalidError(rollback, fmt.Sprintf("couldn't decode deployment config from deployment: %v", err))
	}

	if from.Annotations == nil && len(rollback.UpdatedAnnotations) > 0 {
		from.Annotations = make(map[string]string)
	}
	for key, value := range rollback.UpdatedAnnotations {
		from.Annotations[key] = value
	}

	return r.generator.GenerateRollback(from, to, &rollback.Spec)
}

// executeExecNewPod executes a ExecNewPod hook by creating a new pod based on
// the hook parameters and deployment. The pod is then synchronously watched
// until the pod completes, and if the pod failed, an error is returned.
//
// The hook pod inherits the following from the container the hook refers to:
//
//   * Environment (hook keys take precedence)
//   * Working directory
//   * Resources
func (e *HookExecutor) executeExecNewPod(hook *deployapi.LifecycleHook, deployment *kapi.ReplicationController, label string) error {
	config, err := deployutil.DecodeDeploymentConfig(deployment, e.codec)
	if err != nil {
		return err
	}

	// Build a pod spec from the hook config and deployment
	podSpec, err := makeHookPod(hook, deployment, &config.Template.Strategy, label)
	if err != nil {
		return err
	}

	// Try to create the pod.
	pod, err := e.podClient.CreatePod(deployment.Namespace, podSpec)
	if err != nil {
		if !kerrors.IsAlreadyExists(err) {
			return fmt.Errorf("couldn't create lifecycle pod for %s: %v", deployutil.LabelForDeployment(deployment), err)
		}
	} else {
		glog.V(0).Infof("Created lifecycle pod %s/%s for deployment %s", pod.Namespace, pod.Name, deployutil.LabelForDeployment(deployment))
	}

	stopChannel := make(chan struct{})
	defer close(stopChannel)
	nextPod := e.podClient.PodWatch(pod.Namespace, pod.Name, pod.ResourceVersion, stopChannel)

	// Wait for the hook pod to reach a terminal phase. Start reading logs as
	// soon as the pod enters a usable phase.
	var updatedPod *kapi.Pod
	var once sync.Once
	wg := &sync.WaitGroup{}
	wg.Add(1)
	glog.V(0).Infof("Watching logs for hook pod %s/%s while awaiting completion", pod.Namespace, pod.Name)
waitLoop:
	for {
		updatedPod = nextPod()
		switch updatedPod.Status.Phase {
		case kapi.PodRunning:
			go once.Do(func() { e.readPodLogs(pod, wg) })
		case kapi.PodSucceeded, kapi.PodFailed:
			go once.Do(func() { e.readPodLogs(pod, wg) })
			break waitLoop
		}
	}
	// The pod is finished, wait for all logs to be consumed before returning.
	wg.Wait()
	if updatedPod.Status.Phase == kapi.PodFailed {
		return fmt.Errorf(updatedPod.Status.Message)
	}
	return nil
}