Support multiple targets for docker image tag command

cli/command/image/tag.go

@@ -2,29 +2,33 @@ package image
 
 import (
 	"context"
+	"fmt"
+	"strings"
 
 	"github.com/docker/cli/cli"
 	"github.com/docker/cli/cli/command"
 	"github.com/docker/cli/cli/command/completion"
+	"github.com/docker/docker/errdefs"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 )
 
 type tagOptions struct {
 	image string
-	name  string
+	names []string
 }
 
 // NewTagCommand creates a new `docker tag` command
 func NewTagCommand(dockerCli command.Cli) *cobra.Command {
 	var opts tagOptions
 
 	cmd := &cobra.Command{
-		Use:   "tag SOURCE_IMAGE[:TAG] TARGET_IMAGE[:TAG]",
-		Short: "Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE",
-		Args:  cli.ExactArgs(2),
+		Use:   "tag SOURCE_IMAGE[:TAG] TARGET_IMAGE[:TAG] [TARGET_IMAGE[:TAG]...]",
+		Short: "Create one or more tags TARGET_IMAGE that refers to SOURCE_IMAGE",
+		Args:  cli.RequiresMinArgs(2),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			opts.image = args[0]
-			opts.name = args[1]
+			opts.names = args[1:]
 			return runTag(cmd.Context(), dockerCli, opts)
 		},
 		Annotations: map[string]string{
@@ -40,5 +44,24 @@ func NewTagCommand(dockerCli command.Cli) *cobra.Command {
 }
 
 func runTag(ctx context.Context, dockerCli command.Cli, opts tagOptions) error {
-	return dockerCli.Client().ImageTag(ctx, opts.image, opts.name)
+	var errs []string
+	fatalErr := false
+	for _, name := range opts.names {
+		err := dockerCli.Client().ImageTag(ctx, opts.image, name)
+		if err != nil {
+			if !errdefs.IsNotFound(err) {
+				fatalErr = true
+			}
+			errs = append(errs, err.Error())
+		}
+	}
+
+	if len(errs) > 0 {
+		msg := strings.Join(errs, "\n")
+		if fatalErr {
+			return errors.New(msg)
+		}
+		fmt.Fprintln(dockerCli.Err(), msg)
+	}
+	return nil
 }

docs/reference/commandline/docker.md

@@ -56,7 +56,7 @@ The base command for the Docker CLI.
 | [`stop`](stop.md)             | Stop one or more running containers                                           |
 | [`swarm`](swarm.md)           | Manage Swarm                                                                  |
 | [`system`](system.md)         | Manage Docker                                                                 |
-| [`tag`](tag.md)               | Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE                         |
+| [`tag`](tag.md)               | Create one or more tags TARGET_IMAGE that refers to SOURCE_IMAGE              |
 | [`top`](top.md)               | Display the running processes of a container                                  |
 | [`trust`](trust.md)           | Manage trust on Docker images                                                 |
 | [`unpause`](unpause.md)       | Unpause all processes within one or more containers                           |

docs/reference/commandline/image.md

@@ -18,7 +18,7 @@ Manage images
 | [`push`](image_push.md)       | Upload an image to a registry                                            |
 | [`rm`](image_rm.md)           | Remove one or more images                                                |
 | [`save`](image_save.md)       | Save one or more images to a tar archive (streamed to STDOUT by default) |
-| [`tag`](image_tag.md)         | Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE                    |
+| [`tag`](image_tag.md)         | Create one or more tags TARGET_IMAGE that refers to SOURCE_IMAGE         |
 
 
 

docs/reference/commandline/image_tag.md

@@ -1,7 +1,7 @@
 # tag
 
 <!---MARKER_GEN_START-->
-Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE
+Create one or more tags TARGET_IMAGE that refers to SOURCE_IMAGE
 
 ### Aliases
 

docs/reference/commandline/tag.md

@@ -1,7 +1,7 @@
 # docker tag
 
 <!---MARKER_GEN_START-->
-Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE
+Create one or more tags TARGET_IMAGE that refers to SOURCE_IMAGE
 
 ### Aliases