code: def _generate_contents(self, tar):
          
          uci = self.render(files=False)
          # create a list with all the packages (and remove empty entries)
          packages = packages_pattern.split(uci)
          if '' in packages:
              packages.remove('')
          # create an UCI file for each configuration package used
          for package in packages:
              lines = package.split('\n')
              package_name = lines[0]
              text_contents = '\n'.join(lines[2:])
              self._add_file(tar=tar,
                             name='{0}{1}'.format(config_path, package_name),
                             contents=text_contents)
docs: Adds configuration files to tarfile instance.
  
          :param tar: tarfile instance
          :returns: None