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image_update.go
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image_update.go
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/*
* Ceph Nano (C) 2018 Red Hat, 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.
*/
/*
* Below main package has canonical imports for 'go get' and 'go build'
* to work with all other clones of github.com/ceph/cn repository. For
* more information refer https://golang.org/doc/go1.4#canonicalimports
*/
package cmd
import (
"encoding/json"
"fmt"
"io"
"log"
"strings"
"github.com/docker/docker/api/types"
"github.com/spf13/cobra"
)
// CliImageUpdate is the Cobra CLI call
func CliImageUpdate() *cobra.Command {
cmd := &cobra.Command{
Use: "update IMAGE",
Short: "Update a given container image (makes sense when running on a 'latest')",
Args: cobra.ExactArgs(1),
Run: updateNano,
Long: "IMPORTANT: if cn was run with --image option make sure to use the same image if you're expecting to update that image",
DisableFlagsInUseLine: true,
}
return cmd
}
// updateNano updates the container image
func updateNano(cmd *cobra.Command, args []string) {
imageName := args[0]
if !pullImage() {
events, err := getDocker().ImagePull(ctx, imageName, types.ImagePullOptions{})
if err != nil {
log.Fatal(err)
}
d := json.NewDecoder(events)
type Event struct {
Status string `json:"status"`
Error string `json:"error"`
Progress string `json:"progress"`
ProgressDetail struct {
Current int `json:"current"`
Total int `json:"total"`
} `json:"progressDetail"`
}
var event *Event
for {
if err := d.Decode(&event); err != nil {
if err == io.EOF {
break
}
log.Fatal(err)
}
}
if event != nil {
if strings.Contains(event.Status, fmt.Sprintf("Downloaded newer image for %s", imageName)) {
log.Println("New image " + imageName + " downloaded.")
}
if strings.Contains(event.Status, fmt.Sprintf("Image is up to date for %s", imageName)) {
log.Println("Image " + imageName + " is up to date.")
}
}
}
}