Add ImageService stub for rkt CRI shim

pkg/kubelet/rktshim/imagestore.go

@@ -0,0 +1,61 @@
+/*
+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 rktshim
+
+import (
+	"errors"
+
+	"k8s.io/kubernetes/pkg/kubelet/container"
+)
+
+// TODO(tmrts): Move these errors to the container API for code re-use.
+var (
+	ErrImageNotFound = errors.New("rktshim: image not found")
+)
+
+var _ container.ImageService = (*ImageStore)(nil)
+
+// ImageStore supports CRUD operations for images.
+type ImageStore struct{}
+
+// TODO(tmrts): fill the image store configuration fields.
+type ImageStoreConfig struct{}
+
+// NewImageStore creates an image storage that allows CRUD operations for images.
+func NewImageStore(ImageStoreConfig) (container.ImageService, error) {
+	return &ImageStore{}, nil
+}
+
+// List lists the images residing in the image store.
+func (*ImageStore) List() ([]container.Image, error) {
+	panic("not implemented")
+}
+
+// Pull pulls an image into the image store and uses the given authentication method.
+func (*ImageStore) Pull(container.ImageSpec, container.AuthConfig, *container.PodSandboxConfig) error {
+	panic("not implemented")
+}
+
+// Remove removes the image from the image store.
+func (*ImageStore) Remove(container.ImageSpec) error {
+	panic("not implemented")
+}
+
+// Status returns the status of the image.
+func (*ImageStore) Status(container.ImageSpec) (container.Image, error) {
+	panic("not implemented")
+}