Add glide.yaml and vendor deps

vendor/k8s.io/kubernetes/pkg/kubelet/images/image_manager.go

@@ -0,0 +1,161 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package images
+
+import (
+	"fmt"
+
+	dockerref "github.com/docker/distribution/reference"
+	"github.com/golang/glog"
+	"k8s.io/kubernetes/pkg/api/v1"
+	"k8s.io/kubernetes/pkg/client/record"
+	kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
+	"k8s.io/kubernetes/pkg/kubelet/events"
+	"k8s.io/kubernetes/pkg/util/flowcontrol"
+	"k8s.io/kubernetes/pkg/util/parsers"
+)
+
+// imageManager provides the functionalities for image pulling.
+type imageManager struct {
+	recorder     record.EventRecorder
+	imageService kubecontainer.ImageService
+	backOff      *flowcontrol.Backoff
+	// It will check the presence of the image, and report the 'image pulling', image pulled' events correspondingly.
+	puller imagePuller
+}
+
+var _ ImageManager = &imageManager{}
+
+func NewImageManager(recorder record.EventRecorder, imageService kubecontainer.ImageService, imageBackOff *flowcontrol.Backoff, serialized bool, qps float32, burst int) ImageManager {
+	imageService = throttleImagePulling(imageService, qps, burst)
+
+	var puller imagePuller
+	if serialized {
+		puller = newSerialImagePuller(imageService)
+	} else {
+		puller = newParallelImagePuller(imageService)
+	}
+	return &imageManager{
+		recorder:     recorder,
+		imageService: imageService,
+		backOff:      imageBackOff,
+		puller:       puller,
+	}
+}
+
+// shouldPullImage returns whether we should pull an image according to
+// the presence and pull policy of the image.
+func shouldPullImage(container *v1.Container, imagePresent bool) bool {
+	if container.ImagePullPolicy == v1.PullNever {
+		return false
+	}
+
+	if container.ImagePullPolicy == v1.PullAlways ||
+		(container.ImagePullPolicy == v1.PullIfNotPresent && (!imagePresent)) {
+		return true
+	}
+
+	return false
+}
+
+// records an event using ref, event msg.  log to glog using prefix, msg, logFn
+func (m *imageManager) logIt(ref *v1.ObjectReference, eventtype, event, prefix, msg string, logFn func(args ...interface{})) {
+	if ref != nil {
+		m.recorder.Event(ref, eventtype, event, msg)
+	} else {
+		logFn(fmt.Sprint(prefix, " ", msg))
+	}
+}
+
+// EnsureImageExists pulls the image for the specified pod and container.
+func (m *imageManager) EnsureImageExists(pod *v1.Pod, container *v1.Container, pullSecrets []v1.Secret) (error, string) {
+	logPrefix := fmt.Sprintf("%s/%s", pod.Name, container.Image)
+	ref, err := kubecontainer.GenerateContainerRef(pod, container)
+	if err != nil {
+		glog.Errorf("Couldn't make a ref to pod %v, container %v: '%v'", pod.Name, container.Name, err)
+	}
+
+	// If the image contains no tag or digest, a default tag should be applied.
+	image, err := applyDefaultImageTag(container.Image)
+	if err != nil {
+		msg := fmt.Sprintf("Failed to apply default image tag %q: %v", container.Image, err)
+		m.logIt(ref, v1.EventTypeWarning, events.FailedToInspectImage, logPrefix, msg, glog.Warning)
+		return ErrInvalidImageName, msg
+	}
+
+	spec := kubecontainer.ImageSpec{Image: image}
+	present, err := m.imageService.IsImagePresent(spec)
+	if err != nil {
+		msg := fmt.Sprintf("Failed to inspect image %q: %v", container.Image, err)
+		m.logIt(ref, v1.EventTypeWarning, events.FailedToInspectImage, logPrefix, msg, glog.Warning)
+		return ErrImageInspect, msg
+	}
+
+	if !shouldPullImage(container, present) {
+		if present {
+			msg := fmt.Sprintf("Container image %q already present on machine", container.Image)
+			m.logIt(ref, v1.EventTypeNormal, events.PulledImage, logPrefix, msg, glog.Info)
+			return 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 ErrImageNeverPull, msg
+		}
+	}
+
+	backOffKey := fmt.Sprintf("%s_%s", pod.UID, container.Image)
+	if m.backOff.IsInBackOffSinceUpdate(backOffKey, m.backOff.Clock.Now()) {
+		msg := fmt.Sprintf("Back-off pulling image %q", container.Image)
+		m.logIt(ref, v1.EventTypeNormal, events.BackOffPullImage, logPrefix, msg, glog.Info)
+		return ErrImagePullBackOff, msg
+	}
+	m.logIt(ref, v1.EventTypeNormal, events.PullingImage, logPrefix, fmt.Sprintf("pulling image %q", container.Image), glog.Info)
+	errChan := make(chan error)
+	m.puller.pullImage(spec, pullSecrets, errChan)
+	if err := <-errChan; err != nil {
+		m.logIt(ref, v1.EventTypeWarning, events.FailedToPullImage, logPrefix, fmt.Sprintf("Failed to pull image %q: %v", container.Image, err), glog.Warning)
+		m.backOff.Next(backOffKey, m.backOff.Clock.Now())
+		if err == RegistryUnavailable {
+			msg := fmt.Sprintf("image pull failed for %s because the registry is unavailable.", container.Image)
+			return err, msg
+		} else {
+			return ErrImagePull, err.Error()
+		}
+	}
+	m.logIt(ref, v1.EventTypeNormal, events.PulledImage, logPrefix, fmt.Sprintf("Successfully pulled image %q", container.Image), glog.Info)
+	m.backOff.GC()
+	return nil, ""
+}
+
+// applyDefaultImageTag parses a docker image string, if it doesn't contain any tag or digest,
+// a default tag will be applied.
+func applyDefaultImageTag(image string) (string, error) {
+	named, err := dockerref.ParseNamed(image)
+	if err != nil {
+		return "", fmt.Errorf("couldn't parse image reference %q: %v", image, err)
+	}
+	_, isTagged := named.(dockerref.Tagged)
+	_, isDigested := named.(dockerref.Digested)
+	if !isTagged && !isDigested {
+		named, err := dockerref.WithTag(named, parsers.DefaultImageTag)
+		if err != nil {
+			return "", fmt.Errorf("failed to apply default image tag %q: %v", image, err)
+		}
+		image = named.String()
+	}
+	return image, nil
+}