// findTargetDeployment finds the deployment which is the rollback target by
// searching for deployments associated with config. If desiredVersion is >0,
// the deployment matching desiredVersion will be returned. If desiredVersion
// is <=0, the last completed deployment which is older than the config's
// version will be returned.
func (o *RollbackOptions) findTargetDeployment(config *deployapi.DeploymentConfig, desiredVersion int64) (*kapi.ReplicationController, error) {
	// Find deployments for the config sorted by version descending.
	deployments, err := o.kc.ReplicationControllers(config.Namespace).List(kapi.ListOptions{LabelSelector: deployutil.ConfigSelector(config.Name)})
	if err != nil {
		return nil, err
	}
	sort.Sort(deployutil.ByLatestVersionDesc(deployments.Items))

	// Find the target deployment for rollback. If a version was specified,
	// use the version for a search. Otherwise, use the last completed
	// deployment.
	var target *kapi.ReplicationController
	for _, deployment := range deployments.Items {
		version := deployutil.DeploymentVersionFor(&deployment)
		if desiredVersion > 0 {
			if version == desiredVersion {
				target = &deployment
				break
			}
		} else {
			if version < config.Status.LatestVersion && deployutil.IsCompleteDeployment(&deployment) {
				target = &deployment
				break
			}
		}
	}
	if target == nil {
		return nil, fmt.Errorf("couldn't find deployment for rollback")
	}
	return target, nil
}

func deploymentReachedCompletion(dc *deployapi.DeploymentConfig, rcs []kapi.ReplicationController, pods []kapi.Pod) (bool, error) {
	if len(rcs) == 0 {
		return false, nil
	}
	rc := rcs[len(rcs)-1]
	version := deployutil.DeploymentVersionFor(&rc)
	if version != dc.Status.LatestVersion {
		return false, nil
	}

	if !deployutil.IsCompleteDeployment(&rc) {
		return false, nil
	}
	cond := deployutil.GetDeploymentCondition(dc.Status, deployapi.DeploymentProgressing)
	if cond == nil || cond.Reason != deployutil.NewRcAvailableReason {
		return false, nil
	}
	expectedReplicas := dc.Spec.Replicas
	if dc.Spec.Test {
		expectedReplicas = 0
	}
	if rc.Spec.Replicas != int32(expectedReplicas) {
		return false, fmt.Errorf("deployment is complete but doesn't have expected spec replicas: %d %d", rc.Spec.Replicas, expectedReplicas)
	}
	if rc.Status.Replicas != int32(expectedReplicas) {
		e2e.Logf("POSSIBLE_ANOMALY: deployment is complete but doesn't have expected status replicas: %d %d", rc.Status.Replicas, expectedReplicas)
		return false, nil
	}
	e2e.Logf("Latest rollout of dc/%s (rc/%s) is complete.", dc.Name, rc.Name)
	return true, nil
}

// retry resets the status of the latest deployment to New, which will cause
// the deployment to be retried. An error is returned if the deployment is not
// currently in a failed state.
func (o DeployOptions) retry(config *deployapi.DeploymentConfig) error {
	if config.Spec.Paused {
		return fmt.Errorf("cannot retry a paused deployment config")
	}
	if config.Status.LatestVersion == 0 {
		return fmt.Errorf("no deployments found for %s/%s", config.Namespace, config.Name)
	}
	// TODO: This implies that deploymentconfig.status.latestVersion is always synced. Currently,
	// that's the case because clients (oc, trigger controllers) are updating the status directly.
	// Clients should be acting either on spec or on annotations and status updates should be a
	// responsibility of the main controller. We need to start by unplugging this assumption from
	// our client tools.
	deploymentName := deployutil.LatestDeploymentNameForConfig(config)
	deployment, err := o.kubeClient.ReplicationControllers(config.Namespace).Get(deploymentName)
	if err != nil {
		if kerrors.IsNotFound(err) {
			return fmt.Errorf("unable to find the latest deployment (#%d).\nYou can start a new deployment with 'oc deploy --latest dc/%s'.", config.Status.LatestVersion, config.Name)
		}
		return err
	}

	if !deployutil.IsFailedDeployment(deployment) {
		message := fmt.Sprintf("#%d is %s; only failed deployments can be retried.\n", config.Status.LatestVersion, deployutil.DeploymentStatusFor(deployment))
		if deployutil.IsCompleteDeployment(deployment) {
			message += fmt.Sprintf("You can start a new deployment with 'oc deploy --latest dc/%s'.", config.Name)
		} else {
			message += fmt.Sprintf("Optionally, you can cancel this deployment with 'oc deploy --cancel dc/%s'.", config.Name)
		}

		return fmt.Errorf(message)
	}

	// Delete the deployer pod as well as the deployment hooks pods, if any
	pods, err := o.kubeClient.Pods(config.Namespace).List(kapi.ListOptions{LabelSelector: deployutil.DeployerPodSelector(deploymentName)})
	if err != nil {
		return fmt.Errorf("failed to list deployer/hook pods for deployment #%d: %v", config.Status.LatestVersion, err)
	}
	for _, pod := range pods.Items {
		err := o.kubeClient.Pods(pod.Namespace).Delete(pod.Name, kapi.NewDeleteOptions(0))
		if err != nil {
			return fmt.Errorf("failed to delete deployer/hook pod %s for deployment #%d: %v", pod.Name, config.Status.LatestVersion, err)
		}
	}

	deployment.Annotations[deployapi.DeploymentStatusAnnotation] = string(deployapi.DeploymentStatusNew)
	// clear out the cancellation flag as well as any previous status-reason annotation
	delete(deployment.Annotations, deployapi.DeploymentStatusReasonAnnotation)
	delete(deployment.Annotations, deployapi.DeploymentCancelledAnnotation)
	_, err = o.kubeClient.ReplicationControllers(deployment.Namespace).Update(deployment)
	if err != nil {
		return err
	}
	fmt.Fprintf(o.out, "Retried #%d\n", config.Status.LatestVersion)
	if o.follow {
		return o.getLogs(config)
	}
	fmt.Fprintf(o.out, "Use '%s logs -f dc/%s' to track its progress.\n", o.baseCommandName, config.Name)
	return nil
}

func describeDeployments(f formatter, dcNode *deploygraph.DeploymentConfigNode, activeDeployment *kubegraph.ReplicationControllerNode, inactiveDeployments []*kubegraph.ReplicationControllerNode, restartFn func(*kubegraph.ReplicationControllerNode) int32, count int) []string {
	if dcNode == nil {
		return nil
	}
	out := []string{}
	deploymentsToPrint := append([]*kubegraph.ReplicationControllerNode{}, inactiveDeployments...)

	if activeDeployment == nil {
		on, auto := describeDeploymentConfigTriggers(dcNode.DeploymentConfig)
		if dcNode.DeploymentConfig.Status.LatestVersion == 0 {
			out = append(out, fmt.Sprintf("deployment #1 waiting %s", on))
		} else if auto {
			out = append(out, fmt.Sprintf("deployment #%d pending %s", dcNode.DeploymentConfig.Status.LatestVersion, on))
		}
		// TODO: detect new image available?
	} else {
		deploymentsToPrint = append([]*kubegraph.ReplicationControllerNode{activeDeployment}, inactiveDeployments...)
	}

	for i, deployment := range deploymentsToPrint {
		restartCount := int32(0)
		if restartFn != nil {
			restartCount = restartFn(deployment)
		}
		out = append(out, describeDeploymentStatus(deployment.ReplicationController, i == 0, dcNode.DeploymentConfig.Spec.Test, restartCount))
		switch {
		case count == -1:
			if deployutil.IsCompleteDeployment(deployment.ReplicationController) {
				return out
			}
		default:
			if i+1 >= count {
				return out
			}
		}
	}
	return out
}

// Get returns a streamer resource with the contents of the deployment log
func (r *REST) Get(ctx kapi.Context, name string, opts runtime.Object) (runtime.Object, error) {
	// Ensure we have a namespace in the context
	namespace, ok := kapi.NamespaceFrom(ctx)
	if !ok {
		return nil, errors.NewBadRequest("namespace parameter required.")
	}

	// Validate DeploymentLogOptions
	deployLogOpts, ok := opts.(*deployapi.DeploymentLogOptions)
	if !ok {
		return nil, errors.NewBadRequest("did not get an expected options.")
	}
	if errs := validation.ValidateDeploymentLogOptions(deployLogOpts); len(errs) > 0 {
		return nil, errors.NewInvalid(deployapi.Kind("DeploymentLogOptions"), "", errs)
	}

	// Fetch deploymentConfig and check latest version; if 0, there are no deployments
	// for this config
	config, err := r.dn.DeploymentConfigs(namespace).Get(name)
	if err != nil {
		return nil, errors.NewNotFound(deployapi.Resource("deploymentconfig"), name)
	}
	desiredVersion := config.Status.LatestVersion
	if desiredVersion == 0 {
		return nil, errors.NewBadRequest(fmt.Sprintf("no deployment exists for deploymentConfig %q", config.Name))
	}

	// Support retrieving logs for older deployments
	switch {
	case deployLogOpts.Version == nil:
		// Latest or previous
		if deployLogOpts.Previous {
			desiredVersion--
			if desiredVersion < 1 {
				return nil, errors.NewBadRequest(fmt.Sprintf("no previous deployment exists for deploymentConfig %q", config.Name))
			}
		}
	case *deployLogOpts.Version <= 0 || *deployLogOpts.Version > config.Status.LatestVersion:
		// Invalid version
		return nil, errors.NewBadRequest(fmt.Sprintf("invalid version for deploymentConfig %q: %d", config.Name, *deployLogOpts.Version))
	default:
		desiredVersion = *deployLogOpts.Version
	}

	// Get desired deployment
	targetName := deployutil.DeploymentNameForConfigVersion(config.Name, desiredVersion)
	target, err := r.waitForExistingDeployment(namespace, targetName)
	if err != nil {
		return nil, err
	}
	podName := deployutil.DeployerPodNameForDeployment(target.Name)

	// Check for deployment status; if it is new or pending, we will wait for it. If it is complete,
	// the deployment completed successfully and the deployer pod will be deleted so we will return a
	// success message. If it is running or failed, retrieve the log from the deployer pod.
	status := deployutil.DeploymentStatusFor(target)
	switch status {
	case deployapi.DeploymentStatusNew, deployapi.DeploymentStatusPending:
		if deployLogOpts.NoWait {
			glog.V(4).Infof("Deployment %s is in %s state. No logs to retrieve yet.", deployutil.LabelForDeployment(target), status)
			return &genericrest.LocationStreamer{}, nil
		}
		glog.V(4).Infof("Deployment %s is in %s state, waiting for it to start...", deployutil.LabelForDeployment(target), status)

		if err := deployutil.WaitForRunningDeployerPod(r.pn, target, r.timeout); err != nil {
			return nil, errors.NewBadRequest(fmt.Sprintf("failed to run deployer pod %s: %v", podName, err))
		}

		latest, ok, err := registry.WaitForRunningDeployment(r.rn, target, r.timeout)
		if err != nil {
			return nil, errors.NewBadRequest(fmt.Sprintf("unable to wait for deployment %s to run: %v", deployutil.LabelForDeployment(target), err))
		}
		if !ok {
			return nil, errors.NewServerTimeout(kapi.Resource("ReplicationController"), "get", 2)
		}
		if deployutil.IsCompleteDeployment(latest) {
			podName, err = r.returnApplicationPodName(target)
			if err != nil {
				return nil, err
			}
		}
	case deployapi.DeploymentStatusComplete:
		podName, err = r.returnApplicationPodName(target)
		if err != nil {
			return nil, err
		}
	}

	logOpts := deployapi.DeploymentToPodLogOptions(deployLogOpts)
	location, transport, err := pod.LogLocation(&podGetter{r.pn}, r.connInfo, ctx, podName, logOpts)
	if err != nil {
		return nil, errors.NewBadRequest(err.Error())
	}

	return &genericrest.LocationStreamer{
		Location:        location,
		Transport:       transport,
		ContentType:     "text/plain",
		Flush:           deployLogOpts.Follow,
//.........这里部分代码省略.........

// Deploy starts the deployment process for rcName.
func (d *Deployer) Deploy(namespace, rcName string) error {
	// Look up the new deployment.
	to, err := d.getDeployment(namespace, rcName)
	if err != nil {
		return fmt.Errorf("couldn't get deployment %s: %v", rcName, err)
	}

	// Decode the config from the deployment.
	config, err := deployutil.DecodeDeploymentConfig(to, kapi.Codecs.UniversalDecoder())
	if err != nil {
		return fmt.Errorf("couldn't decode deployment config from deployment %s: %v", to.Name, err)
	}

	// Get a strategy for the deployment.
	s, err := d.strategyFor(config)
	if err != nil {
		return err
	}

	// New deployments must have a desired replica count.
	desiredReplicas, hasDesired := deployutil.DeploymentDesiredReplicas(to)
	if !hasDesired {
		return fmt.Errorf("deployment %s has already run to completion", to.Name)
	}

	// Find all deployments for the config.
	unsortedDeployments, err := d.getDeployments(namespace, config.Name)
	if err != nil {
		return fmt.Errorf("couldn't get controllers in namespace %s: %v", namespace, err)
	}
	deployments := unsortedDeployments.Items

	// Sort all the deployments by version.
	sort.Sort(deployutil.ByLatestVersionDesc(deployments))

	// Find any last completed deployment.
	var from *kapi.ReplicationController
	for _, candidate := range deployments {
		if candidate.Name == to.Name {
			continue
		}
		if deployutil.IsCompleteDeployment(&candidate) {
			from = &candidate
			break
		}
	}

	if deployutil.DeploymentVersionFor(to) < deployutil.DeploymentVersionFor(from) {
		return fmt.Errorf("deployment %s is older than %s", to.Name, from.Name)
	}

	// Scale down any deployments which aren't the new or last deployment.
	for _, candidate := range deployments {
		// Skip the from/to deployments.
		if candidate.Name == to.Name {
			continue
		}
		if from != nil && candidate.Name == from.Name {
			continue
		}
		// Skip the deployment if it's already scaled down.
		if candidate.Spec.Replicas == 0 {
			continue
		}
		// Scale the deployment down to zero.
		retryWaitParams := kubectl.NewRetryParams(1*time.Second, 120*time.Second)
		if err := d.scaler.Scale(candidate.Namespace, candidate.Name, uint(0), &kubectl.ScalePrecondition{Size: -1, ResourceVersion: ""}, retryWaitParams, retryWaitParams); err != nil {
			fmt.Fprintf(d.errOut, "error: Couldn't scale down prior deployment %s: %v\n", deployutil.LabelForDeployment(&candidate), err)
		} else {
			fmt.Fprintf(d.out, "--> Scaled older deployment %s down\n", candidate.Name)
		}
	}

	if d.until == "start" {
		return strategy.NewConditionReachedErr("Ready to start deployment")
	}

	// Perform the deployment.
	if err := s.Deploy(from, to, int(desiredReplicas)); err != nil {
		return err
	}
	fmt.Fprintf(d.out, "--> Success\n")
	return nil
}