fix golint failures - /pkg/kubelet/images

hack/.golint_failures

@@ -211,12 +211,8 @@ pkg/kubelet/dockershim/network/hostport/testing
 pkg/kubelet/dockershim/network/kubenet
 pkg/kubelet/dockershim/network/testing
 pkg/kubelet/events
-pkg/kubelet/images
-pkg/kubelet/kuberuntime
-pkg/kubelet/leaky
 pkg/kubelet/lifecycle
 pkg/kubelet/metrics
-pkg/kubelet/pleg
 pkg/kubelet/pod
 pkg/kubelet/pod/testing
 pkg/kubelet/preemption

pkg/kubelet/images/helpers.go

@@ -46,5 +46,5 @@ func (ts throttledImageService) PullImage(image kubecontainer.ImageSpec, secrets
 	if ts.limiter.TryAccept() {
 		return ts.ImageService.PullImage(image, secrets)
 	}
-	return "", fmt.Errorf("pull QPS exceeded.")
+	return "", fmt.Errorf("pull QPS exceeded")
 }

pkg/kubelet/images/image_gc_manager.go

@@ -44,8 +44,7 @@ type StatsProvider interface {
 	ImageFsStats() (*statsapi.FsStats, error)
 }
 
-// Manages lifecycle of all images.
-//
+// ImageGCManager is an interface for managing lifecycle of all images.
 // Implementation is thread-safe.
 type ImageGCManager interface {
 	// Applies the garbage collection policy. Errors include being unable to free
@@ -61,7 +60,7 @@ type ImageGCManager interface {
 	DeleteUnusedImages() error
 }
 
-// A policy for garbage collecting images. Policy defines an allowed band in
+// ImageGCPolicy is a policy for garbage collecting images. Policy defines an allowed band in
 // which garbage collection will be run.
 type ImageGCPolicy struct {
 	// Any usage above this threshold will always trigger garbage collection.
@@ -144,6 +143,7 @@ type imageRecord struct {
 	size int64
 }
 
+// NewImageGCManager instantiates a new ImageGCManager object.
 func NewImageGCManager(runtime container.Runtime, statsProvider StatsProvider, recorder record.EventRecorder, nodeRef *v1.ObjectReference, policy ImageGCPolicy, sandboxImage string) (ImageGCManager, error) {
 	// Validate policy.
 	if policy.HighThresholdPercent < 0 || policy.HighThresholdPercent > 100 {

pkg/kubelet/images/image_manager.go

@@ -40,6 +40,7 @@ type imageManager struct {
 
 var _ ImageManager = &imageManager{}
 
+// NewImageManager instantiates a new ImageManager object.
 func NewImageManager(recorder record.EventRecorder, imageService kubecontainer.ImageService, imageBackOff *flowcontrol.Backoff, serialized bool, qps float32, burst int) ImageManager {
 	imageService = throttleImagePulling(imageService, qps, burst)
 
@@ -112,11 +113,10 @@ func (m *imageManager) EnsureImageExists(pod *v1.Pod, container *v1.Container, p
 			msg := fmt.Sprintf("Container image %q already present on machine", container.Image)
 			m.logIt(ref, v1.EventTypeNormal, events.PulledImage, logPrefix, msg, glog.Info)
 			return imageRef, "", nil
-		} else {
-			msg := fmt.Sprintf("Container image %q is not present with pull policy of Never", container.Image)
-			m.logIt(ref, v1.EventTypeWarning, events.ErrImageNeverPullPolicy, logPrefix, msg, glog.Warning)
-			return "", msg, ErrImageNeverPull
 		}
+		msg := fmt.Sprintf("Container image %q is not present with pull policy of Never", container.Image)
+		m.logIt(ref, v1.EventTypeWarning, events.ErrImageNeverPullPolicy, logPrefix, msg, glog.Warning)
+		return "", msg, ErrImageNeverPull
 	}
 
 	backOffKey := fmt.Sprintf("%s_%s", pod.UID, container.Image)
@@ -132,7 +132,7 @@ func (m *imageManager) EnsureImageExists(pod *v1.Pod, container *v1.Container, p
 	if imagePullResult.err != nil {
 		m.logIt(ref, v1.EventTypeWarning, events.FailedToPullImage, logPrefix, fmt.Sprintf("Failed to pull image %q: %v", container.Image, imagePullResult.err), glog.Warning)
 		m.backOff.Next(backOffKey, m.backOff.Clock.Now())
-		if imagePullResult.err == RegistryUnavailable {
+		if imagePullResult.err == ErrRegistryUnavailable {
 			msg := fmt.Sprintf("image pull failed for %s because the registry is unavailable.", container.Image)
 			return "", msg, imagePullResult.err
 		}

pkg/kubelet/images/types.go

@@ -23,22 +23,22 @@ import (
 )
 
 var (
-	// Container image pull failed, kubelet is backing off image pull
+	// ErrImagePullBackOff - Container image pull failed, kubelet is backing off image pull
 	ErrImagePullBackOff = errors.New("ImagePullBackOff")
 
-	// Unable to inspect image
+	// ErrImageInspect - Unable to inspect image
 	ErrImageInspect = errors.New("ImageInspectError")
 
-	// General image pull error
+	// ErrImagePull - General image pull error
 	ErrImagePull = errors.New("ErrImagePull")
 
-	// Required Image is absent on host and PullPolicy is NeverPullImage
+	// ErrImageNeverPull - Required Image is absent on host and PullPolicy is NeverPullImage
 	ErrImageNeverPull = errors.New("ErrImageNeverPull")
 
-	// Get http error when pulling image from registry
-	RegistryUnavailable = errors.New("RegistryUnavailable")
+	// ErrRegistryUnavailable - Get http error when pulling image from registry
+	ErrRegistryUnavailable = errors.New("RegistryUnavailable")
 
-	// Unable to parse the image name.
+	// ErrInvalidImageName - Unable to parse the image name.
 	ErrInvalidImageName = errors.New("InvalidImageName")
 )
 

pkg/kubelet/kuberuntime/fake_kuberuntime_manager.go

@@ -69,7 +69,7 @@ func (f *fakePodStateProvider) IsPodTerminated(uid types.UID) bool {
 	return !found
 }
 
-func NewFakeKubeRuntimeManager(runtimeService internalapi.RuntimeService, imageService internalapi.ImageManagerService, machineInfo *cadvisorapi.MachineInfo, osInterface kubecontainer.OSInterface, runtimeHelper kubecontainer.RuntimeHelper, keyring credentialprovider.DockerKeyring) (*kubeGenericRuntimeManager, error) {
+func newFakeKubeRuntimeManager(runtimeService internalapi.RuntimeService, imageService internalapi.ImageManagerService, machineInfo *cadvisorapi.MachineInfo, osInterface kubecontainer.OSInterface, runtimeHelper kubecontainer.RuntimeHelper, keyring credentialprovider.DockerKeyring) (*kubeGenericRuntimeManager, error) {
 	recorder := &record.FakeRecorder{}
 	kubeRuntimeManager := &kubeGenericRuntimeManager{
 		recorder:            recorder,
@@ -91,7 +91,7 @@ func NewFakeKubeRuntimeManager(runtimeService internalapi.RuntimeService, imageS
 		return nil, err
 	}
 
-	kubeRuntimeManager.containerGC = NewContainerGC(runtimeService, newFakePodStateProvider(), kubeRuntimeManager)
+	kubeRuntimeManager.containerGC = newContainerGC(runtimeService, newFakePodStateProvider(), kubeRuntimeManager)
 	kubeRuntimeManager.runtimeName = typedVersion.RuntimeName
 	kubeRuntimeManager.imagePuller = images.NewImageManager(
 		kubecontainer.FilterEventRecorder(recorder),

pkg/kubelet/kuberuntime/instrumented_services_test.go

@@ -38,7 +38,7 @@ func TestRecordOperation(t *testing.T) {
 	assert.NoError(t, err)
 	defer l.Close()
 
-	prometheusUrl := "http://" + temporalServer + "/metrics"
+	prometheusURL := "http://" + temporalServer + "/metrics"
 	mux := http.NewServeMux()
 	mux.Handle("/metrics", prometheus.Handler())
 	server := &http.Server{
@@ -55,11 +55,11 @@ func TestRecordOperation(t *testing.T) {
 
 	assert.HTTPBodyContains(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		mux.ServeHTTP(w, r)
-	}), "GET", prometheusUrl, nil, runtimeOperationsCounterExpected)
+	}), "GET", prometheusURL, nil, runtimeOperationsCounterExpected)
 
 	assert.HTTPBodyContains(t, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		mux.ServeHTTP(w, r)
-	}), "GET", prometheusUrl, nil, runtimeOperationsLatencyExpected)
+	}), "GET", prometheusURL, nil, runtimeOperationsLatencyExpected)
 }
 
 func TestInstrumentedVersion(t *testing.T) {

pkg/kubelet/kuberuntime/kuberuntime_container.go

@@ -50,10 +50,14 @@ import (
 )
 
 var (
+	// ErrCreateContainerConfig - failed to create container config
 	ErrCreateContainerConfig = errors.New("CreateContainerConfigError")
-	ErrCreateContainer       = errors.New("CreateContainerError")
-	ErrPreStartHook          = errors.New("PreStartHookError")
-	ErrPostStartHook         = errors.New("PostStartHookError")
+	// ErrCreateContainer - failed to create container
+	ErrCreateContainer = errors.New("CreateContainerError")
+	// ErrPreStartHook - failed to execute PreStartHook
+	ErrPreStartHook = errors.New("PreStartHookError")
+	// ErrPostStartHook - failed to execute PostStartHook
+	ErrPostStartHook = errors.New("PostStartHookError")
 )
 
 // recordContainerEvent should be used by the runtime manager for all container related events.

pkg/kubelet/kuberuntime/kuberuntime_container_linux_test.go

@@ -124,8 +124,8 @@ func TestGenerateContainerConfig(t *testing.T) {
 	_, _, err = m.generateContainerConfig(&podWithContainerSecurityContext.Spec.Containers[0], podWithContainerSecurityContext, 0, "", podWithContainerSecurityContext.Spec.Containers[0].Image, kubecontainer.ContainerTypeRegular)
 	assert.Error(t, err)
 
-	imageId, _ := imageService.PullImage(&runtimeapi.ImageSpec{Image: "busybox"}, nil)
-	image, _ := imageService.ImageStatus(&runtimeapi.ImageSpec{Image: imageId})
+	imageID, _ := imageService.PullImage(&runtimeapi.ImageSpec{Image: "busybox"}, nil)
+	image, _ := imageService.ImageStatus(&runtimeapi.ImageSpec{Image: imageID})
 
 	image.Uid = nil
 	image.Username = "test"

pkg/kubelet/kuberuntime/kuberuntime_container_test.go

@@ -56,17 +56,17 @@ func TestRemoveContainer(t *testing.T) {
 	_, fakeContainers := makeAndSetFakePod(t, m, fakeRuntime, pod)
 	assert.Equal(t, len(fakeContainers), 1)
 
-	containerId := fakeContainers[0].Id
+	containerID := fakeContainers[0].Id
 	fakeOS := m.osInterface.(*containertest.FakeOS)
-	err = m.removeContainer(containerId)
+	err = m.removeContainer(containerID)
 	assert.NoError(t, err)
 	// Verify container log is removed
 	expectedContainerLogPath := filepath.Join(podLogsRootDirectory, "12345678", "foo", "0.log")
-	expectedContainerLogSymlink := legacyLogSymlink(containerId, "foo", "bar", "new")
+	expectedContainerLogSymlink := legacyLogSymlink(containerID, "foo", "bar", "new")
 	assert.Equal(t, fakeOS.Removes, []string{expectedContainerLogPath, expectedContainerLogSymlink})
 	// Verify container is removed
 	assert.Contains(t, fakeRuntime.Called, "RemoveContainer")
-	containers, err := fakeRuntime.ListContainers(&runtimeapi.ContainerFilter{Id: containerId})
+	containers, err := fakeRuntime.ListContainers(&runtimeapi.ContainerFilter{Id: containerID})
 	assert.NoError(t, err)
 	assert.Empty(t, containers)
 }
@@ -257,10 +257,10 @@ func TestLifeCycleHook(t *testing.T) {
 	}
 
 	fakeRunner := &containertest.FakeContainerCommandRunner{}
-	fakeHttp := &fakeHTTP{}
+	fakeHTTP := &fakeHTTP{}
 
 	lcHanlder := lifecycle.NewHandlerRunner(
-		fakeHttp,
+		fakeHTTP,
 		fakeRunner,
 		nil)
 
@@ -277,11 +277,11 @@ func TestLifeCycleHook(t *testing.T) {
 
 	// Configured and working HTTP hook
 	t.Run("PreStop-HTTPGet", func(t *testing.T) {
-		defer func() { fakeHttp.url = "" }()
+		defer func() { fakeHTTP.url = "" }()
 		testPod.Spec.Containers[0].Lifecycle = httpLifeCycle
 		m.killContainer(testPod, cID, "foo", "testKill", &gracePeriod)
 
-		if !strings.Contains(fakeHttp.url, httpLifeCycle.PreStop.HTTPGet.Host) {
+		if !strings.Contains(fakeHTTP.url, httpLifeCycle.PreStop.HTTPGet.Host) {
 			t.Errorf("HTTP Prestop hook was not invoked")
 		}
 	})
@@ -295,7 +295,7 @@ func TestLifeCycleHook(t *testing.T) {
 
 		m.killContainer(testPod, cID, "foo", "testKill", &gracePeriodLocal)
 
-		if strings.Contains(fakeHttp.url, httpLifeCycle.PreStop.HTTPGet.Host) {
+		if strings.Contains(fakeHTTP.url, httpLifeCycle.PreStop.HTTPGet.Host) {
 			t.Errorf("HTTP Should not execute when gracePeriod is 0")
 		}
 	})

pkg/kubelet/kuberuntime/kuberuntime_gc.go

@@ -39,7 +39,7 @@ type containerGC struct {
 }
 
 // NewContainerGC creates a new containerGC.
-func NewContainerGC(client internalapi.RuntimeService, podStateProvider podStateProvider, manager *kubeGenericRuntimeManager) *containerGC {
+func newContainerGC(client internalapi.RuntimeService, podStateProvider podStateProvider, manager *kubeGenericRuntimeManager) *containerGC {
 	return &containerGC{
 		client:           client,
 		manager:          manager,

pkg/kubelet/kuberuntime/kuberuntime_image_test.go

@@ -109,8 +109,8 @@ func TestPullWithSecrets(t *testing.T) {
 		t.Errorf("unexpected error: %v", err)
 	}
 
-	dockerConfigJson := map[string]map[string]map[string]string{"auths": dockerCfg}
-	dockerConfigJsonContent, err := json.Marshal(dockerConfigJson)
+	dockerConfigJSON := map[string]map[string]map[string]string{"auths": dockerCfg}
+	dockerConfigJSONContent, err := json.Marshal(dockerConfigJSON)
 	if err != nil {
 		t.Errorf("unexpected error: %v", err)
 	}
@@ -153,7 +153,7 @@ func TestPullWithSecrets(t *testing.T) {
 		},
 		"builtin keyring secrets, but use passed with new docker config": {
 			"ubuntu",
-			[]v1.Secret{{Type: v1.SecretTypeDockerConfigJson, Data: map[string][]byte{v1.DockerConfigJsonKey: dockerConfigJsonContent}}},
+			[]v1.Secret{{Type: v1.SecretTypeDockerConfigJson, Data: map[string][]byte{v1.DockerConfigJsonKey: dockerConfigJSONContent}}},
 			credentialprovider.DockerConfig(map[string]credentialprovider.DockerConfigEntry{
 				"index.docker.io/v1/": {Username: "built-in", Password: "password", Provider: nil},
 			}),

pkg/kubelet/kuberuntime/kuberuntime_manager.go

@@ -118,6 +118,7 @@ type kubeGenericRuntimeManager struct {
 	legacyLogProvider LegacyLogProvider
 }
 
+// KubeGenericRuntime is a interface contains interfaces for container runtime and command.
 type KubeGenericRuntime interface {
 	kubecontainer.Runtime
 	kubecontainer.StreamingRuntime
@@ -205,7 +206,7 @@ func NewKubeGenericRuntimeManager(
 		imagePullQPS,
 		imagePullBurst)
 	kubeRuntimeManager.runner = lifecycle.NewHandlerRunner(httpClient, kubeRuntimeManager, kubeRuntimeManager)
-	kubeRuntimeManager.containerGC = NewContainerGC(runtimeService, podStateProvider, kubeRuntimeManager)
+	kubeRuntimeManager.containerGC = newContainerGC(runtimeService, podStateProvider, kubeRuntimeManager)
 
 	kubeRuntimeManager.versionCache = cache.NewObjectCache(
 		func() (interface{}, error) {
@@ -528,7 +529,7 @@ func (m *kubeGenericRuntimeManager) computePodActions(pod *v1.Pod, podStatus *ku
 			reason = "Container failed liveness probe."
 		} else {
 			// Keep the container.
-			keepCount += 1
+			keepCount++
 			continue
 		}
 

pkg/kubelet/kuberuntime/kuberuntime_manager_test.go

@@ -54,7 +54,7 @@ func customTestRuntimeManager(keyring *credentialprovider.BasicDockerKeyring) (*
 	// we may want to set memory capacity.
 	machineInfo := &cadvisorapi.MachineInfo{}
 	osInterface := &containertest.FakeOS{}
-	manager, err := NewFakeKubeRuntimeManager(fakeRuntimeService, fakeImageService, machineInfo, osInterface, &containertest.FakeRuntimeHelper{}, keyring)
+	manager, err := newFakeKubeRuntimeManager(fakeRuntimeService, fakeImageService, machineInfo, osInterface, &containertest.FakeRuntimeHelper{}, keyring)
 	return fakeRuntimeService, fakeImageService, manager, err
 }
 

pkg/kubelet/kuberuntime/legacy.go

@@ -44,9 +44,9 @@ func legacyLogSymlink(containerID string, containerName, podName, podNamespace s
 		containerName, containerID)
 }
 
-func logSymlink(containerLogsDir, podFullName, containerName, dockerId string) string {
+func logSymlink(containerLogsDir, podFullName, containerName, dockerID string) string {
 	suffix := fmt.Sprintf(".%s", legacyLogSuffix)
-	logPath := fmt.Sprintf("%s_%s-%s", podFullName, containerName, dockerId)
+	logPath := fmt.Sprintf("%s_%s-%s", podFullName, containerName, dockerID)
 	// Length of a filename cannot exceed 255 characters in ext4 on Linux.
 	if len(logPath) > ext4MaxFileNameLen-len(suffix) {
 		logPath = logPath[:ext4MaxFileNameLen-len(suffix)]

pkg/kubelet/kuberuntime/legacy_test.go

@@ -40,10 +40,10 @@ func TestLogSymLink(t *testing.T) {
 	containerLogsDir := "/foo/bar"
 	podFullName := randStringBytes(128)
 	containerName := randStringBytes(70)
-	dockerId := randStringBytes(80)
+	dockerID := randStringBytes(80)
 	// The file name cannot exceed 255 characters. Since .log suffix is required, the prefix cannot exceed 251 characters.
-	expectedPath := path.Join(containerLogsDir, fmt.Sprintf("%s_%s-%s", podFullName, containerName, dockerId)[:251]+".log")
-	as.Equal(expectedPath, logSymlink(containerLogsDir, podFullName, containerName, dockerId))
+	expectedPath := path.Join(containerLogsDir, fmt.Sprintf("%s_%s-%s", podFullName, containerName, dockerID)[:251]+".log")
+	as.Equal(expectedPath, logSymlink(containerLogsDir, podFullName, containerName, dockerID))
 }
 
 func TestLegacyLogSymLink(t *testing.T) {

pkg/kubelet/leaky/leaky.go

@@ -19,7 +19,7 @@ limitations under the License.
 package leaky
 
 const (
-	// This is used in a few places outside of Kubelet, such as indexing
+	// PodInfraContainerName is used in a few places outside of Kubelet, such as indexing
 	// into the container info.
 	PodInfraContainerName = "POD"
 )

pkg/kubelet/pleg/generic.go

@@ -106,6 +106,7 @@ type podRecord struct {
 
 type podRecords map[types.UID]*podRecord
 
+// NewGenericPLEG instantiates a new GenericPLEG object and return it.
 func NewGenericPLEG(runtime kubecontainer.Runtime, channelCapacity int,
 	relistPeriod time.Duration, cache kubecontainer.Cache, clock clock.Clock) PodLifecycleEventGenerator {
 	return &GenericPLEG{
@@ -118,7 +119,7 @@ func NewGenericPLEG(runtime kubecontainer.Runtime, channelCapacity int,
 	}
 }
 
-// Returns a channel from which the subscriber can receive PodLifecycleEvent
+// Watch returns a channel from which the subscriber can receive PodLifecycleEvent
 // events.
 // TODO: support multiple subscribers.
 func (g *GenericPLEG) Watch() chan *PodLifecycleEvent {
@@ -130,6 +131,8 @@ func (g *GenericPLEG) Start() {
 	go wait.Until(g.relist, g.relistPeriod, wait.NeverStop)
 }
 
+// Healthy check if PLEG work properly.
+// relistThreshold is the maximum interval between two relist.
 func (g *GenericPLEG) Healthy() (bool, error) {
 	relistTime := g.getRelistTime()
 	elapsed := g.clock.Since(relistTime)

pkg/kubelet/pleg/pleg.go

@@ -20,16 +20,20 @@ import (
 	"k8s.io/apimachinery/pkg/types"
 )
 
+// PodLifeCycleEventType define the event type of pod life cycle events.
 type PodLifeCycleEventType string
 
 const (
+	// ContainerStarted - event type when the new state of container is running.
 	ContainerStarted PodLifeCycleEventType = "ContainerStarted"
-	ContainerDied    PodLifeCycleEventType = "ContainerDied"
+	// ContainerDied - event type when the new state of container is exited.
+	ContainerDied PodLifeCycleEventType = "ContainerDied"
+	// ContainerRemoved - event type when the old state of container is exited.
 	ContainerRemoved PodLifeCycleEventType = "ContainerRemoved"
 	// PodSync is used to trigger syncing of a pod when the observed change of
 	// the state of the pod cannot be captured by any single event above.
 	PodSync PodLifeCycleEventType = "PodSync"
-	// Do not use the events below because they are disabled in GenericPLEG.
+	// ContainerChanged - event type when the new state of container is unknown.
 	ContainerChanged PodLifeCycleEventType = "ContainerChanged"
 )
 
@@ -45,6 +49,7 @@ type PodLifecycleEvent struct {
 	Data interface{}
 }
 
+// PodLifecycleEventGenerator contains functions for generating pod life cycle events.
 type PodLifecycleEventGenerator interface {
 	Start()
 	Watch() chan *PodLifecycleEvent