docs: def chmod(cls, path, permission_text):
          """
          :param str permission_text: "ls -l" style permission string. e.g. -rw-r--r--
          """
  
          try:
              check_file_existence(path)
          except FileNotFoundError:
              _, e, _ = sys.exc_info()  # for python 2.5 compatibility
              logger.debug(e)
              return False
  
          logger.debug("chmod %s %s" % (path, permission_text))
  
          os.chmod(path, parseLsPermissionText(permission_text))