basic.py 文件源码

def _symbolic_mode_to_octal(self, path_stat, symbolic_mode):
        new_mode = stat.S_IMODE(path_stat.st_mode)

        mode_re = re.compile(r'^(?P<users>[ugoa]+)(?P<operator>[-+=])(?P<perms>[rwxXst-]*|[ugo])$')
        for mode in symbolic_mode.split(','):
            match = mode_re.match(mode)
            if match:
                users = match.group('users')
                operator = match.group('operator')
                perms = match.group('perms')

                if users == 'a':
                    users = 'ugo'

                for user in users:
                    mode_to_apply = self._get_octal_mode_from_symbolic_perms(path_stat, user, perms)
                    new_mode = self._apply_operation_to_mode(user, operator, mode_to_apply, new_mode)
            else:
                raise ValueError("bad symbolic permission for mode: %s" % mode)
        return new_mode