code: def write_config(params, config_path=None):
      
      if config_path is None:
          config_path = tempfile.mktemp(prefix="mongo-")
  
      cfg = params.copy()
      if 'setParameter' in cfg:
          set_parameters = cfg.pop('setParameter')
          try:
              for key, value in set_parameters.items():
                  cfg['setParameter = ' + key] = value
          except AttributeError:
              reraise(RequestError,
                      'Not a valid value for setParameter: %r '
                      'Expected "setParameter": {<param name> : value, ...}'
                      % set_parameters)
  
      # fix boolean value
      for key, value in cfg.items():
          if isinstance(value, bool):
              cfg[key] = json.dumps(value)
  
      with open(config_path, 'w') as fd:
          data = '\n'.join('%s=%s' % (key, item) for key, item in cfg.items())
          fd.write(data)
      return config_path
docs: write mongo*'s config file
      Args:
         params - options wich file contains
         config_path - path to the config_file, will create if None
      Return config_path
         where config_path - path to mongo*'s options file