code: def _add_facl_rules(self):
          
          setfacl_command_exists()
          # we are not using pylibacl b/c it's only for python 2
          if self.facl_rules:
              logger.debug("adding ACLs %s to %s", self.facl_rules, self.path)
              r = ",".join(self.facl_rules)
              run_cmd(["setfacl", "-m", r, self.path])
docs: Apply ACL rules on the directory using setfacl program. Raises CommandDoesNotExistException
          if the command is not present on the system.
  
          :return: None