docs: def user_exists(name,
                  user=None, host=None, port=None, maintenance_db=None,
                  password=None,
                  runas=None):
      '''
      Checks if a user exists on the Postgres server.
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' postgres.user_exists 'username'
      '''
      return bool(
          role_get(name,
                   user=user,
                   host=host,
                   port=port,
                   maintenance_db=maintenance_db,
                   password=password,
                   runas=runas,
                   return_password=False))