// encodePods creates an v1.PodList object from pods and returns the encoded
// PodList.
func encodePods(pods []*v1.Pod) (data []byte, err error) {
	podList := new(v1.PodList)
	for _, pod := range pods {
		podList.Items = append(podList.Items, *pod)
	}
	// TODO: this needs to be parameterized to the kubelet, not hardcoded. Depends on Kubelet
	//   as API server refactor.
	// TODO: Locked to v1, needs to be made generic
	codec := api.Codecs.LegacyCodec(schema.GroupVersion{Group: v1.GroupName, Version: "v1"})
	return runtime.Encode(codec, podList)
}

func (dc *DeploymentController) listPods(deployment *extensions.Deployment) (*v1.PodList, error) {
	return deploymentutil.ListPods(deployment,
		func(namespace string, options v1.ListOptions) (*v1.PodList, error) {
			parsed, err := labels.Parse(options.LabelSelector)
			if err != nil {
				return nil, err
			}
			pods, err := dc.podLister.Pods(namespace).List(parsed)
			result := v1.PodList{Items: make([]v1.Pod, 0, len(pods))}
			for i := range pods {
				result.Items = append(result.Items, *pods[i])
			}
			return &result, err
		})
}

// addHashKeyToRSAndPods adds pod-template-hash information to the given rs, if it's not already there, with the following steps:
// 1. Add hash label to the rs's pod template, and make sure the controller sees this update so that no orphaned pods will be created
// 2. Add hash label to all pods this rs owns, wait until replicaset controller reports rs.Status.FullyLabeledReplicas equal to the desired number of replicas
// 3. Add hash label to the rs's label and selector
func (dc *DeploymentController) addHashKeyToRSAndPods(rs *extensions.ReplicaSet) (updatedRS *extensions.ReplicaSet, err error) {
	objCopy, err := api.Scheme.Copy(rs)
	if err != nil {
		return nil, err
	}
	updatedRS = objCopy.(*extensions.ReplicaSet)

	// If the rs already has the new hash label in its selector, it's done syncing
	if labelsutil.SelectorHasLabel(rs.Spec.Selector, extensions.DefaultDeploymentUniqueLabelKey) {
		return
	}
	namespace := rs.Namespace
	hash := rsutil.GetPodTemplateSpecHash(rs)
	rsUpdated := false
	// 1. Add hash template label to the rs. This ensures that any newly created pods will have the new label.
	updatedRS, rsUpdated, err = rsutil.UpdateRSWithRetries(dc.client.Extensions().ReplicaSets(namespace), updatedRS,
		func(updated *extensions.ReplicaSet) error {
			// Precondition: the RS doesn't contain the new hash in its pod template label.
			if updated.Spec.Template.Labels[extensions.DefaultDeploymentUniqueLabelKey] == hash {
				return utilerrors.ErrPreconditionViolated
			}
			updated.Spec.Template.Labels = labelsutil.AddLabel(updated.Spec.Template.Labels, extensions.DefaultDeploymentUniqueLabelKey, hash)
			return nil
		})
	if err != nil {
		return nil, fmt.Errorf("error updating %s %s/%s pod template label with template hash: %v", updatedRS.Kind, updatedRS.Namespace, updatedRS.Name, err)
	}
	if !rsUpdated {
		// If RS wasn't updated but didn't return error in step 1, we've hit a RS not found error.
		// Return here and retry in the next sync loop.
		return rs, nil
	}
	// Make sure rs pod template is updated so that it won't create pods without the new label (orphaned pods).
	if updatedRS.Generation > updatedRS.Status.ObservedGeneration {
		if err = deploymentutil.WaitForReplicaSetUpdated(dc.client, updatedRS.Generation, namespace, updatedRS.Name); err != nil {
			return nil, fmt.Errorf("error waiting for %s %s/%s generation %d observed by controller: %v", updatedRS.Kind, updatedRS.Namespace, updatedRS.Name, updatedRS.Generation, err)
		}
	}
	glog.V(4).Infof("Observed the update of %s %s/%s's pod template with hash %s.", rs.Kind, rs.Namespace, rs.Name, hash)

	// 2. Update all pods managed by the rs to have the new hash label, so they will be correctly adopted.
	selector, err := unversioned.LabelSelectorAsSelector(updatedRS.Spec.Selector)
	if err != nil {
		return nil, fmt.Errorf("error in converting selector to label selector for replica set %s: %s", updatedRS.Name, err)
	}
	options := v1.ListOptions{LabelSelector: selector.String()}
	parsed, err := labels.Parse(options.LabelSelector)
	if err != nil {
		return nil, err
	}
	pods, err := dc.podLister.Pods(namespace).List(parsed)
	if err != nil {
		return nil, fmt.Errorf("error in getting pod list for namespace %s and list options %+v: %s", namespace, options, err)
	}
	podList := v1.PodList{Items: make([]v1.Pod, 0, len(pods))}
	for i := range pods {
		podList.Items = append(podList.Items, *pods[i])
	}
	allPodsLabeled := false
	if allPodsLabeled, err = deploymentutil.LabelPodsWithHash(&podList, updatedRS, dc.client, namespace, hash); err != nil {
		return nil, fmt.Errorf("error in adding template hash label %s to pods %+v: %s", hash, podList, err)
	}
	// If not all pods are labeled but didn't return error in step 2, we've hit at least one pod not found error.
	// Return here and retry in the next sync loop.
	if !allPodsLabeled {
		return updatedRS, nil
	}

	// We need to wait for the replicaset controller to observe the pods being
	// labeled with pod template hash. Because previously we've called
	// WaitForReplicaSetUpdated, the replicaset controller should have dropped
	// FullyLabeledReplicas to 0 already, we only need to wait it to increase
	// back to the number of replicas in the spec.
	if err = deploymentutil.WaitForPodsHashPopulated(dc.client, updatedRS.Generation, namespace, updatedRS.Name); err != nil {
		return nil, fmt.Errorf("%s %s/%s: error waiting for replicaset controller to observe pods being labeled with template hash: %v", updatedRS.Kind, updatedRS.Namespace, updatedRS.Name, err)
	}

	// 3. Update rs label and selector to include the new hash label
	// Copy the old selector, so that we can scrub out any orphaned pods
	if updatedRS, rsUpdated, err = rsutil.UpdateRSWithRetries(dc.client.Extensions().ReplicaSets(namespace), updatedRS,
		func(updated *extensions.ReplicaSet) error {
			// Precondition: the RS doesn't contain the new hash in its label or selector.
			if updated.Labels[extensions.DefaultDeploymentUniqueLabelKey] == hash && updated.Spec.Selector.MatchLabels[extensions.DefaultDeploymentUniqueLabelKey] == hash {
				return utilerrors.ErrPreconditionViolated
			}
			updated.Labels = labelsutil.AddLabel(updated.Labels, extensions.DefaultDeploymentUniqueLabelKey, hash)
			updated.Spec.Selector = labelsutil.AddLabelToSelector(updated.Spec.Selector, extensions.DefaultDeploymentUniqueLabelKey, hash)
			return nil
		}); err != nil {
		return nil, fmt.Errorf("error updating %s %s/%s label and selector with template hash: %v", updatedRS.Kind, updatedRS.Namespace, updatedRS.Name, err)
	}
	if rsUpdated {
		glog.V(4).Infof("Updated %s %s/%s's selector and label with hash %s.", rs.Kind, rs.Namespace, rs.Name, hash)
	}
	// If the RS isn't actually updated in step 3, that's okay, we'll retry in the next sync loop since its selector isn't updated yet.

//.........这里部分代码省略.........

//.........这里部分代码省略.........
								{
									Name:      cmKubeconfigSecretName,
									MountPath: "/etc/federation/controller-manager",
									ReadOnly:  true,
								},
							},
							Env: []v1.EnvVar{
								{
									Name: "POD_NAMESPACE",
									ValueFrom: &v1.EnvVarSource{
										FieldRef: &v1.ObjectFieldSelector{
											FieldPath: "metadata.namespace",
										},
									},
								},
							},
						},
					},
					Volumes: []v1.Volume{
						{
							Name: cmKubeconfigSecretName,
							VolumeSource: v1.VolumeSource{
								Secret: &v1.SecretVolumeSource{
									SecretName: cmKubeconfigSecretName,
								},
							},
						},
					},
				},
			},
		},
	}

	podList := v1.PodList{}
	apiServerPod := v1.Pod{
		TypeMeta: metav1.TypeMeta{
			Kind:       "Pod",
			APIVersion: testapi.Extensions.GroupVersion().String(),
		},
		ObjectMeta: metav1.ObjectMeta{
			Name:      svcName,
			Namespace: namespaceName,
		},
		Status: v1.PodStatus{
			Phase: "Running",
		},
	}

	cmPod := v1.Pod{
		TypeMeta: metav1.TypeMeta{
			Kind:       "Pod",
			APIVersion: testapi.Extensions.GroupVersion().String(),
		},
		ObjectMeta: metav1.ObjectMeta{
			Name:      cmName,
			Namespace: namespaceName,
		},
		Status: v1.PodStatus{
			Phase: "Running",
		},
	}

	podList.Items = append(podList.Items, apiServerPod)
	podList.Items = append(podList.Items, cmPod)

	f, tf, codec, _ := cmdtesting.NewAPIFactory()