rkt: remove rkt image manager.

pkg/kubelet/kubelet.go

@@ -386,7 +386,6 @@ func NewMainKubelet(
 			return nil, err
 		}
 		klet.containerRuntime = rktRuntime
-		klet.imageManager = rkt.NewImageManager(rktRuntime)
 		klet.pleg = pleg.NewGenericPLEG(klet.containerRuntime, plegChannelCapacity, plegRelistPeriod)
 
 		// No Docker daemon to put in a container.

pkg/kubelet/rkt/gc.go

-/*
-Copyright 2015 The Kubernetes Authors All rights reserved.
-
-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 rkt
-
-import "github.com/golang/glog"
-
-// ImageManager manages and garbage collects the container images for rkt.
-type ImageManager struct {
-	runtime *Runtime
-}
-
-func NewImageManager(r *Runtime) *ImageManager {
-	return &ImageManager{runtime: r}
-}
-
-// GarbageCollect collects the images.
-// TODO(yifan): Enforce ImageGCPolicy.
-func (im *ImageManager) GarbageCollect() error {
-	if _, err := im.runtime.runCommand("image", "gc"); err != nil {
-		glog.Errorf("rkt: Failed to gc image: %v", err)
-		return err
-	}
-	return nil
-}
-
-// Start is a no-op for rkt as we don't need to mark unused images in kubelet.
-func (im *ImageManager) Start() error {
-	return nil
-}

pkg/kubelet/rkt/rkt.go

@@ -1401,7 +1401,6 @@ func parseImageInfo(input string) (*kubecontainer.Image, error) {
 }
 
 // RemoveImage removes an on-disk image using 'rkt image rm'.
-// TODO(yifan): Use image ID to reference image.
 func (r *Runtime) RemoveImage(image kubecontainer.ImageSpec) error {
 	img, err := r.getImageByName(image.Image)
 	if err != nil {