Repository: docker/compose
File: cmd/compose/build.go (Go)

Code before:
			}
			return nil
		}),
		RunE: AdaptCmd(func(ctx context.Context, cmd *cobra.Command, args []string) error {
			if cmd.Flags().Changed("ssh") && opts.ssh == "" {
				opts.ssh = "default"
			}
			if cmd.Flags().Changed("progress") && opts.ssh == "" {
				fmt.Fprint(os.Stderr, "--progress is a global compose flag, better use `docker compose --progress xx build ...")
			}
			return runBuild(ctx, backend, opts, args)
		}),
		ValidArgsFunction: completeServiceNames(p),
	}
	cmd.Flags().BoolVar(&opts.push, "push", false, "Push service images.")
	cmd.Flags().BoolVarP(&opts.quiet, "quiet", "q", false, "Don't print anything to STDOUT")
	cmd.Flags().BoolVar(&opts.pull, "pull", false, "Always attempt to pull a newer version of the image.")
	cmd.Flags().StringArrayVar(&opts.args, "build-arg", []string{}, "Set build-time variables for services.")
	cmd.Flags().StringVar(&opts.ssh, "ssh", "", "Set SSH authentications used when building service images. (use 'default' for using your default SSH Agent)")
	cmd.Flags().StringVar(&opts.builder, "builder", "", "Set builder to use.")
	cmd.Flags().Bool("parallel", true, "Build images in parallel. DEPRECATED")
	cmd.Flags().MarkHidden("parallel") //nolint:errcheck
	cmd.Flags().Bool("compress", true, "Compress the build context using gzip. DEPRECATED")
	cmd.Flags().MarkHidden("compress") //nolint:errcheck
	cmd.Flags().Bool("force-rm", true, "Always remove intermediate containers. DEPRECATED")
	cmd.Flags().MarkHidden("force-rm") //nolint:errcheck
	cmd.Flags().BoolVar(&opts.noCache, "no-cache", false, "Do not use cache when building the image")
	cmd.Flags().Bool("no-rm", false, "Do not remove intermediate containers after a successful build. DEPRECATED")
	cmd.Flags().MarkHidden("no-rm") //nolint:errcheck
	cmd.Flags().VarP(&opts.memory, "memory", "m", "Set memory limit for the build container. Not supported by BuildKit.")
	cmd.Flags().StringVar(progress, "progress", buildx.PrinterModeAuto, fmt.Sprintf(`Set type of ui output (%s)`, strings.Join(printerModes, ", ")))
	cmd.Flags().MarkHidden("progress") //nolint:errcheck

	return cmd
}

func runBuild(ctx context.Context, backend api.Service, opts buildOptions, services []string) error {
	project, err := opts.ToProject(services, cli.WithResolvedPaths(true))
	if err != nil {
		return err
	}

	apiBuildOptions, err := opts.toAPIBuildOptions(services)
	if err != nil {
		return err
	}

	apiBuildOptions.Memory = int64(opts.memory)
	return backend.Build(ctx, project, apiBuildOptions)
}


Review comment (suggestion):
Very unrelated, but if this flag is deprecated, should this use `MarkDeprecated()`? (are we still using the value anywhere?)

Code after:
				if err != nil {
					return err
				}
				os.Stdout = devnull
			}
			return nil
		}),
		RunE: AdaptCmd(func(ctx context.Context, cmd *cobra.Command, args []string) error {
			if cmd.Flags().Changed("ssh") && opts.ssh == "" {
				opts.ssh = "default"
			}
			if cmd.Flags().Changed("progress") && opts.ssh == "" {
				fmt.Fprint(os.Stderr, "--progress is a global compose flag, better use `docker compose --progress xx build ...")
			}
			return runBuild(ctx, backend, opts, args)
		}),
		ValidArgsFunction: completeServiceNames(p),
	}
	cmd.Flags().BoolVar(&opts.push, "push", false, "Push service images.")
	cmd.Flags().BoolVarP(&opts.quiet, "quiet", "q", false, "Don't print anything to STDOUT")
	cmd.Flags().BoolVar(&opts.pull, "pull", false, "Always attempt to pull a newer version of the image.")
	cmd.Flags().StringArrayVar(&opts.args, "build-arg", []string{}, "Set build-time variables for services.")
	cmd.Flags().StringVar(&opts.ssh, "ssh", "", "Set SSH authentications used when building service images. (use 'default' for using your default SSH Agent)")
	cmd.Flags().StringVar(&opts.builder, "builder", "", "Set builder to use.")
	cmd.Flags().Bool("parallel", true, "Build images in parallel. DEPRECATED")
	cmd.Flags().MarkHidden("parallel") //nolint:errcheck
	cmd.Flags().Bool("compress", true, "Compress the build context using gzip. DEPRECATED")
	cmd.Flags().MarkHidden("compress") //nolint:errcheck
	cmd.Flags().Bool("force-rm", true, "Always remove intermediate containers. DEPRECATED")
	cmd.Flags().MarkHidden("force-rm") //nolint:errcheck
	cmd.Flags().BoolVar(&opts.noCache, "no-cache", false, "Do not use cache when building the image")
	cmd.Flags().Bool("no-rm", false, "Do not remove intermediate containers after a successful build. DEPRECATED")
	cmd.Flags().MarkHidden("no-rm") //nolint:errcheck
	cmd.Flags().VarP(&opts.memory, "memory", "m", "Set memory limit for the build container. Not supported by BuildKit.")
	cmd.Flags().StringVar(progress, "progress", buildx.PrinterModeAuto, fmt.Sprintf(`Set type of ui output (%s)`, strings.Join(printerModes, ", ")))
	cmd.Flags().MarkHidden("progress") //nolint:errcheck

	return cmd
}

func runBuild(ctx context.Context, backend api.Service, opts buildOptions, services []string) error {
	project, err := opts.ToProject(services, cli.WithResolvedPaths(true))
	if err != nil {
		return err
	}

	apiBuildOptions, err := opts.toAPIBuildOptions(services)
	if err != nil {
		return err
	}