def _add_facl_rules(self):
setfacl_command_exists()<EOL>if self.facl_rules:<EOL><INDENT>logger.debug("<STR_LIT>", self.facl_rules, self.path)<EOL>r = "<STR_LIT:U+002C>".join(self.facl_rules)<EOL>run_cmd(["<STR_LIT>", "<STR_LIT>", r, self.path])<EOL><DEDENT>
Apply ACL rules on the directory using setfacl program. Raises CommandDoesNotExistException
if the command is not present on the system.

:return: None