code: func ProjectPull(p project.APIProject, c *cli.Context) error {
  	err := p.Pull(context.Background(), c.Args()...)
  	if err != nil && !c.Bool("ignore-pull-failures") {
  		return cli.NewExitError(err.Error(), 1)
  	}
  	return nil
  }
docs: // ProjectPull pulls images for services.