cli/push: Emit stripped push note

Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>

Author: vvoland

cli/command/image/push.go

@@ -2,6 +2,7 @@ package image
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
 	"io"
 	"os"
@@ -73,9 +74,8 @@ func RunPush(ctx context.Context, dockerCli command.Cli, opts pushOptions) error
 
 		printNote(dockerCli, `Selecting a single platform will only push one matching image manifest from a multi-platform image index.
 This means that any other components attached to the multi-platform image index (like Buildkit attestations) won't be pushed.
-If you want to only push a single platform image while preserving the attestations, please build an image with only that platform and push it instead.
-Example: echo "FROM %s" | docker build - --platform %s -t <NEW-TAG>
-`, opts.remote, opts.platform)
+If you want to only push a single platform image while preserving the attestations, please use 'docker convert\n'
+`)
 	}
 
 	ref, err := reference.ParseNormalizedNamed(opts.remote)
@@ -116,20 +116,64 @@ Example: echo "FROM %s" | docker build - --platform %s -t <NEW-TAG>
 		return err
 	}
 
+	defer func() {
+		if strippedNote != "" {
+			fmt.Fprintln(dockerCli.Err(), "")
+			printNote(dockerCli, strippedNote)
+		}
+	}()
+
 	defer responseBody.Close()
 	if !opts.untrusted {
 		// TODO PushTrustedReference currently doesn't respect `--quiet`
 		return PushTrustedReference(dockerCli, repoInfo, ref, authConfig, responseBody)
 	}
 
 	if opts.quiet {
-		err = jsonmessage.DisplayJSONMessagesToStream(responseBody, streams.NewOut(io.Discard), nil)
+		err = jsonmessage.DisplayJSONMessagesToStream(responseBody, streams.NewOut(io.Discard), handleAux(dockerCli))
 		if err == nil {
 			fmt.Fprintln(dockerCli.Out(), ref.String())
 		}
 		return err
 	}
-	return jsonmessage.DisplayJSONMessagesToStream(responseBody, dockerCli.Out(), nil)
+	return jsonmessage.DisplayJSONMessagesToStream(responseBody, dockerCli.Out(), handleAux(dockerCli))
+}
+
+var strippedNote = ""
+
+func handleAux(dockerCli command.Cli) func(jm jsonmessage.JSONMessage) {
+	return func(jm jsonmessage.JSONMessage) {
+		b := []byte(*jm.Aux)
+
+		aux := map[string]string{}
+		err := json.Unmarshal(b, &aux)
+		if err != nil {
+			return
+		}
+
+		strippedNote = string(b)
+
+		_, stripped := aux["Stripped"]
+		if stripped {
+			index := aux["Index"]
+			mfst := aux["Manifest"]
+
+			strippedNote = fmt.Sprintf(`Not all multiplatform-content is present and only the available single-platform image was pushed
+%s -> %s`, red(index), green(mfst))
+		}
+	}
+}
+
+func red(text string) string {
+	return fmt.Sprintf("\033[31m%s\033[0m", text)
+}
+
+func green(text string) string {
+	return fmt.Sprintf("\033[32m%s\033[0m", text)
+}
+
+func bold(text string) string {
+	return fmt.Sprintf("\033[1m%s\033[0m", text)
 }
 
 func printNote(dockerCli command.Cli, format string, args ...any) {
@@ -138,5 +182,5 @@ func printNote(dockerCli command.Cli, format string, args ...any) {
 	} else {
 		_, _ = fmt.Fprint(dockerCli.Err(), "[ NOTE ] ")
 	}
-	_, _ = fmt.Fprintf(dockerCli.Err(), format+"\n\n", args...)
+	_, _ = fmt.Fprintf(dockerCli.Err(), bold(format)+"\n", args...)
 }