bccache.py 文件源码

def _get_default_cache_dir(self):
        def _unsafe_dir():
            raise RuntimeError('Cannot determine safe temp directory.  You '
                               'need to explicitly provide one.')

        tmpdir = tempfile.gettempdir()

        # On windows the temporary directory is used specific unless
        # explicitly forced otherwise.  We can just use that.
        if os.name == 'nt':
            return tmpdir
        if not hasattr(os, 'getuid'):
            _unsafe_dir()

        dirname = '_jinja2-cache-%d' % os.getuid()
        actual_dir = os.path.join(tmpdir, dirname)

        try:
            os.mkdir(actual_dir, stat.S_IRWXU)
        except OSError as e:
            if e.errno != errno.EEXIST:
                raise
        try:
            os.chmod(actual_dir, stat.S_IRWXU)
            actual_dir_stat = os.lstat(actual_dir)
            if actual_dir_stat.st_uid != os.getuid() \
               or not stat.S_ISDIR(actual_dir_stat.st_mode) \
               or stat.S_IMODE(actual_dir_stat.st_mode) != stat.S_IRWXU:
                _unsafe_dir()
        except OSError as e:
            if e.errno != errno.EEXIST:
                raise

        actual_dir_stat = os.lstat(actual_dir)
        if actual_dir_stat.st_uid != os.getuid() \
           or not stat.S_ISDIR(actual_dir_stat.st_mode) \
           or stat.S_IMODE(actual_dir_stat.st_mode) != stat.S_IRWXU:
            _unsafe_dir()

        return actual_dir