osfs.py 文件源码

def __init__(self,
                 root_path,
                 create=False,
                 create_mode=0o777):
        """Create an OSFS instance.
        """
        super(OSFS, self).__init__()
        root_path = fsdecode(fspath(root_path))
        _root_path = os.path.expanduser(os.path.expandvars(root_path))
        _root_path = os.path.normpath(os.path.abspath(_root_path))
        self.root_path = _root_path

        if create:
            try:
                if not os.path.isdir(_root_path):
                    os.makedirs(_root_path, mode=create_mode)
            except OSError as error:
                raise errors.CreateFailed(
                    'unable to create {} ({})'.format(root_path, error)
                )
        else:
            if not os.path.isdir(_root_path):
                raise errors.CreateFailed(
                    'root path does not exist'
                )

        _meta = self._meta = {
            'case_insensitive': os.path.normcase('Aa') != 'aa',
            'network': False,
            'read_only': False,
            'supports_rename': True,
            'thread_safe': True,
            'unicode_paths': os.path.supports_unicode_filenames,
            'virtual': False,
        }

        if _WINDOWS_PLATFORM:  # pragma: nocover
            _meta["invalid_path_chars"] =\
                ''.join(six.unichr(n) for n in range(31)) + '\\:*?"<>|'
        else:
            _meta["invalid_path_chars"] = '\0'

            if 'PC_PATH_MAX' in os.pathconf_names:
                _meta['max_sys_path_length'] = (
                    os.pathconf(
                        fsencode(_root_path),
                        os.pathconf_names['PC_PATH_MAX']
                    )
                )