code: def diff_sevice_by_text(service_name, service, environment, cf_client, repo_root):
      
      global ret_code
  
      logger.info('Investigating textual diff for `%s`:`%s` in environment `%s`',
                  service['type'], service_name, environment)
  
      try:
          local_template = render_local_template(service_name, environment,
                                                 repo_root, service['template_file'])
  
          current_template = fetch_current_cloudformation_template(
              service_name, environment, cf_client)
  
      except Exception as e:
          ret_code = 2
          logger.error(e)
          return
  
      ret = diff_string_templates(local_template, current_template)
      if not ret:
          logger.info('Deployed service `%s` in environment `%s` matches '
                      'the local template.', service_name, environment)
      else:
          ret_code = 1
          logger.error('Service `%s` in environment `%s` differs from '
                       'the local template.',
                       service_name, environment)
          logger.info('Change details:\n        %s', indentify(ret))
docs: Render the local template and compare it to the template that was last
      applied in the target environment.