Function _filemode_to_int

Lib/test/test_tarfile.py:3564–3590

Inverse of `stat.filemode` (for permission bits) Using mode strings rather than numbers makes the later tests more readable.

(mode)

                        self.assertEqual(expected, got)

def _filemode_to_int(mode):
    """Inverse of `stat.filemode` (for permission bits)

    Using mode strings rather than numbers makes the later tests more readable.
    """
    str_mode = mode[1:]
    result = (
          {'r': stat.S_IRUSR, '-': 0}[str_mode[0]]
        | {'w': stat.S_IWUSR, '-': 0}[str_mode[1]]
        | {'x': stat.S_IXUSR, '-': 0,
           's': stat.S_IXUSR | stat.S_ISUID,
           'S': stat.S_ISUID}[str_mode[2]]
        | {'r': stat.S_IRGRP, '-': 0}[str_mode[3]]
        | {'w': stat.S_IWGRP, '-': 0}[str_mode[4]]
        | {'x': stat.S_IXGRP, '-': 0,
           's': stat.S_IXGRP | stat.S_ISGID,
           'S': stat.S_ISGID}[str_mode[5]]
        | {'r': stat.S_IROTH, '-': 0}[str_mode[6]]
        | {'w': stat.S_IWOTH, '-': 0}[str_mode[7]]
        | {'x': stat.S_IXOTH, '-': 0,
           't': stat.S_IXOTH | stat.S_ISVTX,
           'T': stat.S_ISVTX}[str_mode[8]]
        )
    # check we did this right
    assert stat.filemode(result)[1:] == mode[1:]

    return result

class ArchiveMaker:
    """Helper to create a tar file with specific contents