Add image load.

Signed-off-by: Lantao Liu <lantaol@google.com>

pkg/server/image_load.go

@@ -0,0 +1,78 @@
+/*
+Copyright 2017 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 server
+
+import (
+	"fmt"
+	"golang.org/x/net/context"
+	"os"
+	"path/filepath"
+
+	"github.com/golang/glog"
+
+	api "github.com/kubernetes-incubator/cri-containerd/pkg/api/v1"
+	"github.com/kubernetes-incubator/cri-containerd/pkg/containerd/importer"
+	imagestore "github.com/kubernetes-incubator/cri-containerd/pkg/store/image"
+)
+
+// LoadImage loads a image into containerd.
+func (c *criContainerdService) LoadImage(ctx context.Context, r *api.LoadImageRequest) (*api.LoadImageResponse, error) {
+	path := r.GetFilePath()
+	if !filepath.IsAbs(path) {
+		return nil, fmt.Errorf("path %q is not an absolute path", path)
+	}
+	f, err := os.Open(path)
+	if err != nil {
+		return nil, fmt.Errorf("failed to open file: %v", err)
+	}
+	repoTags, err := importer.Import(ctx, c.client.ContentStore(), c.client.ImageService(), f)
+	if err != nil {
+		return nil, fmt.Errorf("failed to import image: %v", err)
+	}
+	for _, repoTag := range repoTags {
+		image, err := c.client.GetImage(ctx, repoTag)
+		if err != nil {
+			return nil, fmt.Errorf("failed to get image %q: %v", repoTag, err)
+		}
+		if err := image.Unpack(ctx, c.config.ContainerdConfig.Snapshotter); err != nil {
+			glog.Warningf("Failed to unpack image %q: %v", repoTag, err)
+			// Do not fail image importing. Unpack will be retried when container creation.
+		}
+		info, err := getImageInfo(ctx, image, c.client.ContentStore())
+		if err != nil {
+			return nil, fmt.Errorf("failed to get image %q info: %v", repoTag, err)
+		}
+		id := info.id
+
+		if err := c.createImageReference(ctx, id, image.Target()); err != nil {
+			return nil, fmt.Errorf("failed to create image reference %q: %v", id, err)
+		}
+		img := imagestore.Image{
+			ID:       id,
+			RepoTags: []string{repoTag},
+			ChainID:  info.chainID.String(),
+			Size:     info.size,
+			Config:   &info.config,
+			Image:    image,
+		}
+
+		if err := c.imageStore.Add(img); err != nil {
+			return nil, fmt.Errorf("failed to add image %q into store: %v", id, err)
+		}
+		glog.V(4).Infof("Imported image with id %q, repo tag %q", id, repoTag)
+	}
+	return &api.LoadImageResponse{Images: repoTags}, nil
+}