docker/cli · error

failed to assemble ManifestDescriptor: %w

Error message

failed to assemble ManifestDescriptor: %w

What it means

Error "failed to assemble ManifestDescriptor: %w" thrown in docker/cli.

Source

Thrown at cli/command/manifest/inspect.go:122

	}
	jsonBytes, err := json.MarshalIndent(manifest, "", "\t")
	if err != nil {
		return err
	}
	_, _ = dockerCli.Out().Write(append(jsonBytes, '\n'))
	return nil
}

func printManifestList(dockerCli command.Cli, namedRef reference.Named, list []types.ImageManifest, opts inspectOptions) error {
	if !opts.verbose {
		targetRepo := reference.TrimNamed(namedRef)

		manifests := make([]manifestlist.ManifestDescriptor, 0, len(list))
		// More than one response. This is a manifest list.
		for _, img := range list {
			mfd, err := buildManifestDescriptor(targetRepo, img)
			if err != nil {
				return fmt.Errorf("failed to assemble ManifestDescriptor: %w", err)
			}
			manifests = append(manifests, mfd)
		}
		deserializedML, err := manifestlist.FromDescriptors(manifests)
		if err != nil {
			return err
		}
		jsonBytes, err := deserializedML.MarshalJSON()
		if err != nil {
			return err
		}
		_, _ = fmt.Fprintln(dockerCli.Out(), string(jsonBytes))
		return nil
	}
	jsonBytes, err := json.MarshalIndent(list, "", "\t")
	if err != nil {
		return err
	}

View on GitHub (pinned to e9452d6e78)

When it happens

Trigger: Thrown at cli/command/manifest/inspect.go:122 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of docker/cli@e9452d6e78 (2026-08-01). Data as JSON: /data/errors/ced04d3330890c9d.json. Report an issue: GitHub.