docs: def default_roles(*role_list):
      """Decorate task with these roles by default, but override with -R, -H"""
      def selectively_attach(func):
          """Only decorate if nothing specified on command line"""
          # pylint: disable=W0142
          if not env.roles and not env.hosts:
              return roles(*role_list)(func)
          else:
              if env.hosts:
                  func = hosts(*env.hosts)(func)
              if env.roles:
                  func = roles(*env.roles)(func)
              return func
      return selectively_attach