119 lines
3.1 KiB
Go
119 lines
3.1 KiB
Go
package main
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import (
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"context"
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"fmt"
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"log"
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"os"
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"regexp"
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"github.com/docker/docker/api/types/container"
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"github.com/docker/docker/api/types/image"
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"github.com/docker/docker/client"
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"github.com/regclient/regclient"
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"github.com/regclient/regclient/types/ref"
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)
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// Zerlegt einen Image-Namen in die Form registry/repo:tag für regclient
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func parseImageName(imageName string) (string, error) {
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r := regexp.MustCompile(`^(?:(?P<registry>[^/]+)/)?(?P<repo>[^:]+)(?::(?P<tag>.+))?$`)
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match := r.FindStringSubmatch(imageName)
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if len(match) == 0 {
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return "", fmt.Errorf("Fehler beim Parsen des Image-Namens: %s", imageName)
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}
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registry := match[r.SubexpIndex("registry")]
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repo := match[r.SubexpIndex("repo")]
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tag := match[r.SubexpIndex("tag")]
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if repo == "" {
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return "", fmt.Errorf("Kein Repo erkannt in %s", imageName)
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}
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if registry == "" {
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registry = "registry-1.docker.io"
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}
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if tag == "" {
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tag = "latest"
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}
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return fmt.Sprintf("%s/%s:%s", registry, repo, tag), nil
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}
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// Digest remote ermitteln (regclient)
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func getRemoteDigest(ctx context.Context, rc *regclient.RegClient, image string) (string, error) {
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refObj, err := ref.New(image)
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if err != nil {
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return "", fmt.Errorf("image-ref ungültig: %w", err)
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}
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desc, err := rc.ManifestHead(ctx, refObj)
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if err != nil {
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return "", fmt.Errorf("Fehler ManifestHead %s: %w", image, err)
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}
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return desc.GetDigest().String(), nil
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}
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// Lokalen Digest via Docker-API holen
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func getLocalDigestOfImage(ctx context.Context, cli *client.Client, imageName string) (string, error) {
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images, err := cli.ImageList(ctx, image.ListOptions{All: true})
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if err != nil {
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return "", err
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}
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for _, img := range images {
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for _, t := range img.RepoTags {
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if t == imageName {
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if len(img.RepoDigests) > 0 {
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return img.RepoDigests[0], nil
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}
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return img.ID, nil
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}
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}
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}
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return "", fmt.Errorf("Image %s nicht lokal gefunden", imageName)
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}
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func main() {
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ctx := context.Background()
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cli, err := client.NewClientWithOpts(client.FromEnv)
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if err != nil {
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log.Fatal(err)
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}
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defer cli.Close()
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rc := regclient.New()
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containers, err := cli.ContainerList(ctx, container.ListOptions{All: true})
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if err != nil {
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log.Fatal(err)
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}
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if len(containers) == 0 {
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fmt.Println("Keine laufenden Container gefunden")
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os.Exit(0)
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}
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for _, ctr := range containers {
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fmt.Printf("Container: %s %s (status: %s)\n", ctr.ID[:12], ctr.Image, ctr.Status)
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imageFull, err := parseImageName(ctr.Image)
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if err != nil {
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fmt.Printf(" Fehler beim Parsen des Image-Namens: %v\n", err)
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continue
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}
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localDigest, err := getLocalDigestOfImage(ctx, cli, ctr.Image)
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if err != nil {
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fmt.Printf(" Fehler beim lokalen Digest: %v\n", err)
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continue
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}
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remoteDigest, err := getRemoteDigest(ctx, rc, imageFull)
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if err != nil {
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fmt.Printf(" Fehler beim Remote-Digest: %v\n", err)
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continue
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}
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fmt.Println(" Local Digest: ", localDigest)
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fmt.Println(" Remote Digest:", remoteDigest)
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if localDigest == remoteDigest {
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fmt.Println(" -> Image ist aktuell")
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} else {
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fmt.Println(" -> Update verfügbar!\n")
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}
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}
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}
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