ore gcloud: add ability to label images

Add ability to label images to facilate resource management.

mantle/cmd/ore/gcloud/label-image.go

@@ -0,0 +1,69 @@
+// Copyright 2017 CoreOS, Inc.
+//
+// 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 gcloud
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	cmdLabelImage = &cobra.Command{
+		Use:   "label-image --name <name> --labels foo=bar ...",
+		Short: "label an image",
+		Run:   runLabelImage,
+	}
+	name   string
+	labels []string
+)
+
+func init() {
+	// Initialize the command and its flags
+	GCloud.AddCommand(cmdLabelImage)
+	cmdLabelImage.Flags().StringVar(&name, "name", "", "GCloud Image Name")
+	cmdLabelImage.Flags().StringSliceVar(&labels, "labels", []string{}, "list of key=value labels to attach to the GCloud image")
+}
+
+func runLabelImage(cmd *cobra.Command, args []string) {
+	if name == "" {
+		fmt.Fprintf(os.Stderr, "Provide --name to label\n")
+		os.Exit(1)
+	}
+
+	if len(labels) < 1 {
+		fmt.Fprintf(os.Stderr, "Provide at least one --label to label\n")
+		os.Exit(1)
+	}
+
+	labelMap := make(map[string]string)
+	for _, label := range labels {
+		splitLabel := strings.SplitN(label, "=", 2)
+		if len(splitLabel) != 2 {
+			fmt.Fprintf(os.Stderr, "invalid label format; should be key=value, not %v\n", label)
+			os.Exit(1)
+		}
+		key, value := splitLabel[0], splitLabel[1]
+		labelMap[key] = value
+	}
+
+	err := api.SetImageLabels(name, labelMap)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "couldn't create image labels: %v", err)
+		os.Exit(1)
+	}
+}

mantle/platform/api/gcloud/image.go

@@ -283,3 +283,25 @@ func (a *API) SetImagePublic(name string) error {
 	}
 	return nil
 }
+
+// Add label(s) to an image
+func (a *API) SetImageLabels(name string, labels map[string]string) error {
+
+	img, err := a.compute.Images.Get(a.options.Project, name).Do()
+	if err != nil {
+		return fmt.Errorf("Getting image %s failed: %v", name, err)
+	}
+
+	req := &compute.GlobalSetLabelsRequest{
+		LabelFingerprint: img.LabelFingerprint,
+		Labels:           labels,
+	}
+
+	op, err := a.compute.Images.SetLabels(a.options.Project, name, req).Do()
+	if err != nil {
+		return fmt.Errorf("Adding labels to %s failed: %v", name, err)
+	}
+
+	plog.Infof("Updated labels on image %s: %v", name, op.Status)
+	return nil
+}