Better stack status check

Signed-off-by: Simon Ferquel <simon.ferquel@docker.com>

cli/command/stack/kubernetes/cli.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/docker/cli/cli/command"
 	"github.com/docker/cli/kubernetes"
+	cliv1beta1 "github.com/docker/cli/kubernetes/client/clientset/typed/compose/v1beta1"
 	flag "github.com/spf13/pflag"
 	kubeclient "k8s.io/client-go/kubernetes"
 	restclient "k8s.io/client-go/rest"
@@ -113,3 +114,11 @@ func (c *KubeCli) checkHostsMatch() error {
 		"         Update $DOCKER_HOST (or pass -H), or use 'kubectl config use-context' to match.\n", daemonEndpoint.Hostname(), kubeEndpoint.Hostname())
 	return nil
 }
+
+func (c *KubeCli) stacksv1beta1() (cliv1beta1.StackInterface, error) {
+	raw, err := newStackV1Beta1(c.kubeConfig, c.kubeNamespace)
+	if err != nil {
+		return nil, err
+	}
+	return raw.stacks, nil
+}

cli/command/stack/kubernetes/deploy.go

@@ -2,9 +2,12 @@ package kubernetes
 
 import (
 	"fmt"
+	"io"
 
+	"github.com/docker/cli/cli/command"
 	"github.com/docker/cli/cli/command/stack/loader"
 	"github.com/docker/cli/cli/command/stack/options"
+	"github.com/morikuni/aec"
 	"github.com/pkg/errors"
 )
 
@@ -39,10 +42,6 @@ func RunDeploy(dockerCli *KubeCli, opts options.Deploy) error {
 	configMaps := composeClient.ConfigMaps()
 	secrets := composeClient.Secrets()
 	services := composeClient.Services()
-	pods := composeClient.Pods()
-	watcher := DeployWatcher{
-		Pods: pods,
-	}
 
 	if err := stacks.IsColliding(services, stack); err != nil {
 		return err
@@ -61,10 +60,109 @@ func RunDeploy(dockerCli *KubeCli, opts options.Deploy) error {
 	}
 
 	fmt.Fprintln(cmdOut, "Waiting for the stack to be stable and running...")
-
+	v1beta1Cli, err := dockerCli.stacksv1beta1()
-	<-watcher.Watch(stack.name, stack.getServices())
+	if err != nil {
-
+		return err
-	fmt.Fprintf(cmdOut, "Stack %s is stable and running\n\n", stack.name)
+	}
-
+
-	return nil
+	pods := composeClient.Pods()
+	watcher := &deployWatcher{
+		stacks: v1beta1Cli,
+		pods:   pods,
+	}
+	statusUpdates := make(chan serviceStatus)
+	displayDone := make(chan struct{})
+	go func() {
+		defer close(displayDone)
+		display := newStatusDisplay(dockerCli.Out())
+		for status := range statusUpdates {
+			display.OnStatus(status)
+		}
+	}()
+
+	err = watcher.Watch(stack.name, stack.getServices(), statusUpdates)
+	close(statusUpdates)
+	<-displayDone
+	if err != nil {
+		return err
+	}
+	fmt.Fprintf(cmdOut, "\nStack %s is stable and running\n\n", stack.name)
+	return nil
+
+}
+
+type statusDisplay interface {
+	OnStatus(serviceStatus)
+}
+type metaServiceState string
+
+const (
+	metaServiceStateReady   = metaServiceState("Ready")
+	metaServiceStatePending = metaServiceState("Pending")
+	metaServiceStateFailed  = metaServiceState("Failed")
+)
+
+func metaStateFromStatus(status serviceStatus) metaServiceState {
+	switch {
+	case status.podsReady > 0:
+		return metaServiceStateReady
+	case status.podsPending > 0:
+		return metaServiceStatePending
+	default:
+		return metaServiceStateFailed
+	}
+}
+
+type forwardOnlyStatusDisplay struct {
+	o      *command.OutStream
+	states map[string]metaServiceState
+}
+
+func (d *forwardOnlyStatusDisplay) OnStatus(status serviceStatus) {
+	state := metaStateFromStatus(status)
+	if d.states[status.name] != state {
+		d.states[status.name] = state
+		fmt.Fprintf(d.o, "%s: %s\n", status.name, state)
+	}
+}
+
+type interactiveStatusDisplay struct {
+	o        *command.OutStream
+	statuses []serviceStatus
+}
+
+func (d *interactiveStatusDisplay) OnStatus(status serviceStatus) {
+	b := aec.EmptyBuilder
+	for ix := 0; ix < len(d.statuses); ix++ {
+		b = b.Up(1).EraseLine(aec.EraseModes.All)
+	}
+	b = b.Column(0)
+	fmt.Fprint(d.o, b.ANSI)
+	updated := false
+	for ix, s := range d.statuses {
+		if s.name == status.name {
+			d.statuses[ix] = status
+			s = status
+			updated = true
+		}
+		displayInteractiveServiceStatus(s, d.o)
+	}
+	if !updated {
+		d.statuses = append(d.statuses, status)
+		displayInteractiveServiceStatus(status, d.o)
+	}
+}
+
+func displayInteractiveServiceStatus(status serviceStatus, o io.Writer) {
+	state := metaStateFromStatus(status)
+	totalFailed := status.podsFailed + status.podsSucceeded + status.podsUnknown
+	fmt.Fprintf(o, "%[1]s: %[2]s\t\t[pod status: %[3]d/%[6]d ready, %[4]d/%[6]d pending, %[5]d/%[6]d failed]\n", status.name, state,
+		status.podsReady, status.podsPending, totalFailed, status.podsTotal)
+}
+
+func newStatusDisplay(o *command.OutStream) statusDisplay {
+	if !o.IsTerminal() {
+		return &forwardOnlyStatusDisplay{o: o, states: map[string]metaServiceState{}}
+	}
+	return &interactiveStatusDisplay{o: o}
 }

cli/command/stack/kubernetes/stackclient.go

@@ -33,7 +33,7 @@ type stackV1Beta1 struct {
 	stacks composev1beta1.StackInterface
 }
 
-func newStackV1Beta1(config *rest.Config, namespace string) (StackClient, error) {
+func newStackV1Beta1(config *rest.Config, namespace string) (*stackV1Beta1, error) {
 	client, err := composev1beta1.NewForConfig(config)
 	if err != nil {
 		return nil, err
@@ -136,7 +136,7 @@ type stackV1Beta2 struct {
 	stacks composev1beta2.StackInterface
 }
 
-func newStackV1Beta2(config *rest.Config, namespace string) (StackClient, error) {
+func newStackV1Beta2(config *rest.Config, namespace string) (*stackV1Beta2, error) {
 	client, err := composev1beta2.NewForConfig(config)
 	if err != nil {
 		return nil, err

cli/command/stack/kubernetes/watcher.go

@@ -1,116 +1,255 @@
 package kubernetes
 
 import (
-	"fmt"
+	"context"
+	"sync"
 	"time"
 
+	apiv1beta1 "github.com/docker/cli/kubernetes/compose/v1beta1"
 	"github.com/docker/cli/kubernetes/labels"
+	"github.com/pkg/errors"
 	apiv1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-	corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	runtimeutil "k8s.io/apimachinery/pkg/util/runtime"
+	"k8s.io/apimachinery/pkg/watch"
+	cache "k8s.io/client-go/tools/cache"
+	podutils "k8s.io/kubernetes/pkg/api/v1/pod"
 )
 
+type stackListWatch interface {
+	List(opts metav1.ListOptions) (*apiv1beta1.StackList, error)
+	Watch(opts metav1.ListOptions) (watch.Interface, error)
+}
+
+type podListWatch interface {
+	List(opts metav1.ListOptions) (*apiv1.PodList, error)
+	Watch(opts metav1.ListOptions) (watch.Interface, error)
+}
+
 // DeployWatcher watches a stack deployement
-type DeployWatcher struct {
+type deployWatcher struct {
-	Pods corev1.PodInterface
+	pods   podListWatch
+	stacks stackListWatch
 }
 
 // Watch watches a stuck deployement and return a chan that will holds the state of the stack
-func (w DeployWatcher) Watch(name string, serviceNames []string) chan bool {
+func (w *deployWatcher) Watch(name string, serviceNames []string, statusUpdates chan serviceStatus) error {
-	stop := make(chan bool)
+	errC := make(chan error, 1)
+	defer close(errC)
 
-	go w.waitForPods(name, serviceNames, stop)
+	handlers := runtimeutil.ErrorHandlers
 
-	return stop
+	// informer errors are reported using global error handlers
-}
+	runtimeutil.ErrorHandlers = append(handlers, func(err error) {
-
+		errC <- err
-func (w DeployWatcher) waitForPods(stackName string, serviceNames []string, stop chan bool) {
-	starts := map[string]int32{}
-
-	for {
-		time.Sleep(1 * time.Second)
-
-		list, err := w.Pods.List(metav1.ListOptions{
-			LabelSelector:        labels.SelectorForStack(stackName),
-			IncludeUninitialized: true,
 	})
-		if err != nil {
+	defer func() {
-			stop <- true
+		runtimeutil.ErrorHandlers = handlers
+	}()
+
+	ctx, cancel := context.WithCancel(context.Background())
+	wg := sync.WaitGroup{}
+	defer func() {
+		cancel()
+		wg.Wait()
+	}()
+	wg.Add(2)
+	go func() {
+		defer wg.Done()
+		w.watchStackStatus(ctx, name, errC)
+	}()
+	go func() {
+		defer wg.Done()
+		w.waitForPods(ctx, name, serviceNames, errC, statusUpdates)
+	}()
+
+	return <-errC
+}
+
+type stackWatcher struct {
+	resultChan chan error
+	stackName  string
+}
+
+var _ cache.ResourceEventHandler = &stackWatcher{}
+
+func (sw *stackWatcher) OnAdd(obj interface{}) {
+	stack, ok := obj.(*apiv1beta1.Stack)
+	switch {
+	case !ok:
+		sw.resultChan <- errors.Errorf("stack %s has incorrect type", sw.stackName)
+	case stack.Status.Phase == apiv1beta1.StackFailure:
+		sw.resultChan <- errors.Errorf("stack %s failed with status %s: %s", sw.stackName, stack.Status.Phase, stack.Status.Message)
+	}
+}
+
+func (sw *stackWatcher) OnUpdate(oldObj, newObj interface{}) {
+	sw.OnAdd(newObj)
+}
+
+func (sw *stackWatcher) OnDelete(obj interface{}) {
+}
+
+func (w *deployWatcher) watchStackStatus(ctx context.Context, stackname string, e chan error) {
+	informer := newStackInformer(w.stacks, stackname)
+	sw := &stackWatcher{
+		resultChan: e,
+	}
+	informer.AddEventHandler(sw)
+	informer.Run(ctx.Done())
+}
+
+type serviceStatus struct {
+	name          string
+	podsPending   int
+	podsRunning   int
+	podsSucceeded int
+	podsFailed    int
+	podsUnknown   int
+	podsReady     int
+	podsTotal     int
+}
+
+type podWatcher struct {
+	stackName     string
+	services      map[string]serviceStatus
+	resultChan    chan error
+	starts        map[string]int32
+	indexer       cache.Indexer
+	statusUpdates chan serviceStatus
+}
+
+var _ cache.ResourceEventHandler = &podWatcher{}
+
+func (pw *podWatcher) handlePod(obj interface{}) {
+	pod, ok := obj.(*apiv1.Pod)
+	if !ok {
+		pw.resultChan <- errors.Errorf("Pod has incorrect type in stack %s", pw.stackName)
 		return
 	}
-
-		for i := range list.Items {
-			pod := list.Items[i]
-			if pod.Status.Phase != apiv1.PodRunning {
-				continue
-			}
-
-			startCount := startCount(pod)
 	serviceName := pod.Labels[labels.ForServiceName]
-			if startCount != starts[serviceName] {
+	pw.updateServiceStatus(serviceName)
-				if startCount == 1 {
+	if pw.allReady() {
-					fmt.Printf(" - Service %s has one container running\n", serviceName)
+		select {
-				} else {
+		case pw.resultChan <- nil:
-					fmt.Printf(" - Service %s was restarted %d %s\n", serviceName, startCount-1, timeTimes(startCount-1))
+		default:
-				}
+			// result has already been reported, just don't block
-
-				starts[serviceName] = startCount
-			}
-		}
-
-		if allReady(list.Items, serviceNames) {
-			stop <- true
-			return
 		}
 	}
 }
 
-func startCount(pod apiv1.Pod) int32 {
+func (pw *podWatcher) updateServiceStatus(serviceName string) {
-	restart := int32(0)
+	pods, _ := pw.indexer.ByIndex("byservice", serviceName)
-
+	status := serviceStatus{name: serviceName}
-	for _, status := range pod.Status.ContainerStatuses {
+	for _, obj := range pods {
-		restart += status.RestartCount
+		if pod, ok := obj.(*apiv1.Pod); ok {
+			switch pod.Status.Phase {
+			case apiv1.PodPending:
+				status.podsPending++
+			case apiv1.PodRunning:
+				status.podsRunning++
+			case apiv1.PodSucceeded:
+				status.podsSucceeded++
+			case apiv1.PodFailed:
+				status.podsFailed++
+			case apiv1.PodUnknown:
+				status.podsUnknown++
 			}
-
+			if podutils.IsPodReady(pod) {
-	return 1 + restart
+				status.podsReady++
-}
-
-func allReady(pods []apiv1.Pod, serviceNames []string) bool {
-	serviceUp := map[string]bool{}
-
-	for _, pod := range pods {
-		if time.Since(pod.GetCreationTimestamp().Time) < 10*time.Second {
-			return false
-		}
-
-		ready := false
-		for _, cond := range pod.Status.Conditions {
-			if cond.Type == apiv1.PodReady && cond.Status == apiv1.ConditionTrue {
-				ready = true
 			}
 		}
-
+	}
-		if !ready {
+	status.podsTotal = len(pods)
-			return false
+	oldStatus := pw.services[serviceName]
+	if oldStatus != status {
+		pw.statusUpdates <- status
+	}
+	pw.services[serviceName] = status
 }
 
-		serviceName := pod.Labels[labels.ForServiceName]
+func (pw *podWatcher) allReady() bool {
-		serviceUp[serviceName] = true
+	for _, status := range pw.services {
-	}
+		if status.podsReady == 0 {
-
-	for _, serviceName := range serviceNames {
-		if !serviceUp[serviceName] {
 			return false
 		}
 	}
-
 	return true
 }
 
-func timeTimes(n int32) string {
+func (pw *podWatcher) OnAdd(obj interface{}) {
-	if n == 1 {
+	pw.handlePod(obj)
-		return "time"
 }
 
-	return "times"
+func (pw *podWatcher) OnUpdate(oldObj, newObj interface{}) {
+	pw.handlePod(newObj)
+}
+
+func (pw *podWatcher) OnDelete(obj interface{}) {
+	pw.handlePod(obj)
+}
+
+func (w *deployWatcher) waitForPods(ctx context.Context, stackName string, serviceNames []string, e chan error, statusUpdates chan serviceStatus) {
+	informer := newPodInformer(w.pods, stackName, cache.Indexers{
+		"byservice": func(obj interface{}) ([]string, error) {
+			pod, ok := obj.(*apiv1.Pod)
+			if !ok {
+				return nil, errors.Errorf("Pod has incorrect type in stack %s", stackName)
+			}
+			return []string{pod.Labels[labels.ForServiceName]}, nil
+		}})
+	services := map[string]serviceStatus{}
+	for _, name := range serviceNames {
+		services[name] = serviceStatus{name: name}
+	}
+	pw := &podWatcher{
+		stackName:     stackName,
+		services:      services,
+		resultChan:    e,
+		starts:        map[string]int32{},
+		indexer:       informer.GetIndexer(),
+		statusUpdates: statusUpdates,
+	}
+	informer.AddEventHandler(pw)
+	informer.Run(ctx.Done())
+}
+
+func newPodInformer(podsClient podListWatch, stackName string, indexers cache.Indexers) cache.SharedIndexInformer {
+	return cache.NewSharedIndexInformer(
+		&cache.ListWatch{
+			ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
+				options.LabelSelector = labels.SelectorForStack(stackName)
+				options.IncludeUninitialized = true
+				return podsClient.List(options)
+			},
+
+			WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
+				options.LabelSelector = labels.SelectorForStack(stackName)
+				options.IncludeUninitialized = true
+				return podsClient.Watch(options)
+			},
+		},
+		&apiv1.Pod{},
+		time.Second*5,
+		indexers,
+	)
+}
+
+func newStackInformer(stacksClient stackListWatch, stackName string) cache.SharedInformer {
+	return cache.NewSharedInformer(
+		&cache.ListWatch{
+			ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
+				options.LabelSelector = labels.SelectorForStack(stackName)
+				return stacksClient.List(options)
+			},
+
+			WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
+				options.LabelSelector = labels.SelectorForStack(stackName)
+				return stacksClient.Watch(options)
+			},
+		},
+		&apiv1beta1.Stack{},
+		time.Second*5,
+	)
 }

cli/command/stack/kubernetes/watcher_test.go

@@ -0,0 +1,218 @@
+package kubernetes
+
+import (
+	"testing"
+
+	apiv1beta1 "github.com/docker/cli/kubernetes/compose/v1beta1"
+	composelabels "github.com/docker/cli/kubernetes/labels"
+	"github.com/gotestyourself/gotestyourself/assert"
+	apiv1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/runtime/serializer"
+	"k8s.io/apimachinery/pkg/watch"
+	k8stesting "k8s.io/client-go/testing"
+)
+
+var podsResource = apiv1.SchemeGroupVersion.WithResource("pods")
+var podKind = apiv1.SchemeGroupVersion.WithKind("Pod")
+var stacksResource = apiv1beta1.SchemeGroupVersion.WithResource("stacks")
+var stackKind = apiv1beta1.SchemeGroupVersion.WithKind("Stack")
+
+type testPodAndStackRepository struct {
+	fake *k8stesting.Fake
+}
+
+func (r *testPodAndStackRepository) stackListWatchForNamespace(ns string) *testStackListWatch {
+	return &testStackListWatch{fake: r.fake, ns: ns}
+}
+func (r *testPodAndStackRepository) podListWatchForNamespace(ns string) *testPodListWatch {
+	return &testPodListWatch{fake: r.fake, ns: ns}
+}
+
+func newTestPodAndStackRepository(initialPods []apiv1.Pod, initialStacks []apiv1beta1.Stack, podWatchHandler, stackWatchHandler k8stesting.WatchReactionFunc) *testPodAndStackRepository {
+	var scheme = runtime.NewScheme()
+	var codecs = serializer.NewCodecFactory(scheme)
+	metav1.AddToGroupVersion(scheme, schema.GroupVersion{Version: "v1"})
+	apiv1.AddToScheme(scheme)
+	apiv1beta1.AddToScheme(scheme)
+
+	o := k8stesting.NewObjectTracker(scheme, codecs.UniversalDecoder())
+	for _, obj := range initialPods {
+		if err := o.Add(&obj); err != nil {
+			panic(err)
+		}
+	}
+	for _, obj := range initialStacks {
+		if err := o.Add(&obj); err != nil {
+			panic(err)
+		}
+	}
+	fakePtr := &k8stesting.Fake{}
+	fakePtr.AddReactor("*", "*", k8stesting.ObjectReaction(o))
+	if podWatchHandler != nil {
+		fakePtr.AddWatchReactor(podsResource.Resource, podWatchHandler)
+	}
+	if stackWatchHandler != nil {
+		fakePtr.AddWatchReactor(stacksResource.Resource, stackWatchHandler)
+	}
+	fakePtr.AddWatchReactor("*", k8stesting.DefaultWatchReactor(watch.NewFake(), nil))
+	return &testPodAndStackRepository{fake: fakePtr}
+}
+
+type testStackListWatch struct {
+	fake *k8stesting.Fake
+	ns   string
+}
+
+func (s *testStackListWatch) List(opts metav1.ListOptions) (*apiv1beta1.StackList, error) {
+	obj, err := s.fake.Invokes(k8stesting.NewListAction(stacksResource, stackKind, s.ns, opts), &apiv1beta1.StackList{})
+
+	if obj == nil {
+		return nil, err
+	}
+
+	label, _, _ := k8stesting.ExtractFromListOptions(opts)
+	if label == nil {
+		label = labels.Everything()
+	}
+	list := &apiv1beta1.StackList{}
+	for _, item := range obj.(*apiv1beta1.StackList).Items {
+		if label.Matches(labels.Set(item.Labels)) {
+			list.Items = append(list.Items, item)
+		}
+	}
+	return list, err
+}
+func (s *testStackListWatch) Watch(opts metav1.ListOptions) (watch.Interface, error) {
+	return s.fake.InvokesWatch(k8stesting.NewWatchAction(stacksResource, s.ns, opts))
+}
+
+type testPodListWatch struct {
+	fake *k8stesting.Fake
+	ns   string
+}
+
+func (p *testPodListWatch) List(opts metav1.ListOptions) (*apiv1.PodList, error) {
+	obj, err := p.fake.Invokes(k8stesting.NewListAction(podsResource, podKind, p.ns, opts), &apiv1.PodList{})
+
+	if obj == nil {
+		return nil, err
+	}
+
+	label, _, _ := k8stesting.ExtractFromListOptions(opts)
+	if label == nil {
+		label = labels.Everything()
+	}
+	list := &apiv1.PodList{}
+	for _, item := range obj.(*apiv1.PodList).Items {
+		if label.Matches(labels.Set(item.Labels)) {
+			list.Items = append(list.Items, item)
+		}
+	}
+	return list, err
+
+}
+func (p *testPodListWatch) Watch(opts metav1.ListOptions) (watch.Interface, error) {
+	return p.fake.InvokesWatch(k8stesting.NewWatchAction(podsResource, p.ns, opts))
+}
+
+func TestDeployWatchOk(t *testing.T) {
+	stack := apiv1beta1.Stack{
+		ObjectMeta: metav1.ObjectMeta{Name: "test-stack", Namespace: "test-ns"},
+	}
+
+	serviceNames := []string{"svc1", "svc2"}
+	testRepo := newTestPodAndStackRepository(nil, []apiv1beta1.Stack{stack}, func(action k8stesting.Action) (handled bool, ret watch.Interface, err error) {
+		res := watch.NewFake()
+		go func() {
+			pod1 := &apiv1.Pod{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:      "test1",
+					Namespace: "test-ns",
+					Labels:    composelabels.ForService("test-stack", "svc1"),
+				},
+				Status: apiv1.PodStatus{
+					Phase: apiv1.PodRunning,
+					Conditions: []apiv1.PodCondition{
+						{
+							Type:   apiv1.PodReady,
+							Status: apiv1.ConditionTrue,
+						},
+					},
+				},
+			}
+			pod2 := &apiv1.Pod{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:      "test2",
+					Namespace: "test-ns",
+					Labels:    composelabels.ForService("test-stack", "svc2"),
+				},
+				Status: apiv1.PodStatus{
+					Phase: apiv1.PodRunning,
+					Conditions: []apiv1.PodCondition{
+						{
+							Type:   apiv1.PodReady,
+							Status: apiv1.ConditionTrue,
+						},
+					},
+				},
+			}
+			res.Add(pod1)
+			res.Add(pod2)
+		}()
+
+		return true, res, nil
+	}, nil)
+
+	testee := &deployWatcher{
+		stacks: testRepo.stackListWatchForNamespace("test-ns"),
+		pods:   testRepo.podListWatchForNamespace("test-ns"),
+	}
+
+	statusUpdates := make(chan serviceStatus)
+	go func() {
+		for range statusUpdates {
+		}
+	}()
+	defer close(statusUpdates)
+	err := testee.Watch(stack.Name, serviceNames, statusUpdates)
+	assert.NilError(t, err)
+}
+
+func TestDeployReconcileFailure(t *testing.T) {
+	stack := apiv1beta1.Stack{
+		ObjectMeta: metav1.ObjectMeta{Name: "test-stack", Namespace: "test-ns"},
+	}
+
+	serviceNames := []string{"svc1", "svc2"}
+	testRepo := newTestPodAndStackRepository(nil, []apiv1beta1.Stack{stack}, nil, func(action k8stesting.Action) (handled bool, ret watch.Interface, err error) {
+		res := watch.NewFake()
+		go func() {
+			sfailed := stack
+			sfailed.Status = apiv1beta1.StackStatus{
+				Phase:   apiv1beta1.StackFailure,
+				Message: "test error",
+			}
+			res.Modify(&sfailed)
+		}()
+
+		return true, res, nil
+	})
+
+	testee := &deployWatcher{
+		stacks: testRepo.stackListWatchForNamespace("test-ns"),
+		pods:   testRepo.podListWatchForNamespace("test-ns"),
+	}
+
+	statusUpdates := make(chan serviceStatus)
+	go func() {
+		for range statusUpdates {
+		}
+	}()
+	defer close(statusUpdates)
+	err := testee.Watch(stack.Name, serviceNames, statusUpdates)
+	assert.ErrorContains(t, err, "Failure: test error")
+}