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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,186 @@ | ||
| package commands | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/base64" | ||
| "encoding/json" | ||
| "fmt" | ||
| "log" | ||
| "os" | ||
| "time" | ||
|
|
||
| "github.com/docker/cli/cli/config" | ||
| "github.com/docker/cli/cli/config/credentials" | ||
| "github.com/docker/docker/api/types" | ||
| "github.com/docker/docker/client" | ||
| "github.com/spf13/cobra" | ||
| "k8s.io/apimachinery/pkg/util/wait" | ||
| ) | ||
|
|
||
| func newPullCommand(ctx context.Context, logger *log.Logger) *cobra.Command { | ||
| cmd := cobra.Command{ | ||
| Use: "pull", | ||
| Short: "Pull the source images found in the image manifest", | ||
| Args: cobra.OnlyValidArgs, | ||
|
|
||
| RunE: func(cmd *cobra.Command, args []string) error { | ||
| if err := runPullCommand(ctx, logger); err != nil { | ||
| return fmt.Errorf("pull: %w", err) | ||
| } | ||
|
|
||
| return nil | ||
| }, | ||
| } | ||
|
|
||
| return &cmd | ||
| } | ||
|
|
||
| func runPullCommand(ctx context.Context, logger *log.Logger) error { | ||
| cli, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation()) | ||
| if err != nil { | ||
| return fmt.Errorf("new docker client: %w", err) | ||
| } | ||
|
|
||
| manifest, err := getManifest() | ||
| if err != nil { | ||
| return fmt.Errorf("get manifest: %w", err) | ||
| } | ||
|
|
||
| if len(manifest.Images) == 0 { | ||
| return fmt.Errorf("no images found in manifest (%s)", manifestFileName) | ||
| } | ||
|
|
||
| if err := pullSourceImages(ctx, cli, logger, manifest.Images); err != nil { | ||
| return fmt.Errorf("pull source images: %w", err) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func getEncodedImageAuth(image ContainerImage) (string, error) { | ||
| username := os.Getenv(image.Auth.Username) | ||
| password := os.Getenv(image.Auth.Password) | ||
|
|
||
| authConfig := Auth{ | ||
| Username: username, | ||
| Password: password, | ||
| } | ||
|
|
||
| jsonAuth, err := json.Marshal(authConfig) | ||
| if err != nil { | ||
| return "", fmt.Errorf("marshal auth: %w", err) | ||
| } | ||
|
|
||
| return base64.URLEncoding.EncodeToString(jsonAuth), nil | ||
| } | ||
|
|
||
| func getEncodedAuthForRegistry(registry string) (string, error) { | ||
| if registry == "" { | ||
| registry = "https://index.docker.io/v2/" | ||
| } | ||
|
|
||
| cfg, err := config.Load(config.Dir()) | ||
| if err != nil { | ||
| return "", fmt.Errorf("loading docker config: %w", err) | ||
| } | ||
|
|
||
| if !cfg.ContainsAuth() { | ||
| cfg.CredentialsStore = credentials.DetectDefaultStore(cfg.CredentialsStore) | ||
| } | ||
|
|
||
| authConfig, err := cfg.GetAuthConfig(registry) | ||
| if err != nil { | ||
| return "", fmt.Errorf("getting auth config: %w", err) | ||
| } | ||
|
|
||
| jsonAuth, err := json.Marshal(authConfig) | ||
| if err != nil { | ||
| return "", fmt.Errorf("marshal auth: %w", err) | ||
| } | ||
|
|
||
| return base64.URLEncoding.EncodeToString(jsonAuth), nil | ||
| } | ||
|
|
||
| func imageExistsLocally(ctx context.Context, cli *client.Client, image ContainerImage) (bool, error) { | ||
| imageList, err := cli.ImageList(ctx, types.ImageListOptions{}) | ||
| if err != nil { | ||
| return false, fmt.Errorf("image list: %w", err) | ||
| } | ||
|
|
||
| // When an image is sourced from docker hub, the image tag does | ||
| // not include docker.io on the local machine | ||
| if image.SourceRegistry == "docker.io" { | ||
| image.SourceRegistry = "" | ||
| } | ||
|
|
||
| for _, imageSummary := range imageList { | ||
| for _, localImage := range imageSummary.RepoTags { | ||
| if localImage == image.Source() { | ||
| return true, nil | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return false, nil | ||
| } | ||
|
|
||
| func pullSourceImages(ctx context.Context, cli *client.Client, logger *log.Logger, images []ContainerImage) error { | ||
| for _, image := range images { | ||
| exists, err := imageExistsLocally(ctx, cli, image) | ||
| if err != nil { | ||
| return fmt.Errorf("checking local image: %w", err) | ||
| } | ||
|
|
||
| if exists { | ||
| logger.Printf("Image %s exists locally. Skipping ...", image.Source()) | ||
| continue | ||
| } | ||
|
|
||
| if err := pullSourceImageAndWait(ctx, logger, cli, image); err != nil { | ||
| return fmt.Errorf("waiting for source image pull: %w", err) | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func pullSourceImageAndWait(ctx context.Context, logger *log.Logger, cli *client.Client, image ContainerImage) error { | ||
| var encodedAuth string | ||
| var err error | ||
| if image.Auth.Password != "" { | ||
| encodedAuth, err = getEncodedImageAuth(image) | ||
| } else { | ||
| encodedAuth, err = getEncodedAuthForRegistry(image.SourceRegistry) | ||
| } | ||
| if err != nil { | ||
| return fmt.Errorf("get encoded auth: %w", err) | ||
| } | ||
|
|
||
| opts := types.ImagePullOptions{ | ||
| RegistryAuth: encodedAuth, | ||
| } | ||
|
|
||
| reader, err := cli.ImagePull(ctx, image.Source(), opts) | ||
| if err != nil { | ||
| return fmt.Errorf("image pull: %w", err) | ||
| } | ||
|
|
||
| if err := waitForImagePulled(ctx, logger, cli, image); err != nil { | ||
| return fmt.Errorf("wait for source image pull: %w", err) | ||
| } | ||
| reader.Close() | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func waitForImagePulled(ctx context.Context, logger *log.Logger, cli *client.Client, image ContainerImage) error { | ||
| return wait.PollImmediate(5*time.Second, 5*time.Minute, func() (bool, error) { | ||
| exists, err := imageExistsLocally(ctx, cli, image) | ||
| if err != nil { | ||
| return false, fmt.Errorf("checking local image: %w", err) | ||
| } | ||
|
|
||
| logger.Printf("Pulling %s ...\n", image.Source()) | ||
| return exists, nil | ||
| }) | ||
| } |
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