Python zipfile의 ZipInfo 인스턴스에 있는 external_attr을 받아서 파일 퍼미션을 구하는 함수

permisson.py

def permission(external_attr):
    stat_ix = (4, 2, 1)

    user_perm = 0
    for mode_num, mode in zip(stat_ix, (stat.S_IRUSR, stat.S_IWUSR, stat.S_IXUSR)):
        if (external_attr & mode) > 0:
            user_perm += mode_num

    grp_perm = 0
    for mode_num, mode in zip(stat_ix, (stat.S_IRGRP, stat.S_IWGRP, stat.S_IXGRP)):
        if (external_attr & mode) > 0:
            grp_perm += mode_num

    oth_perm = 0
    for mode_num, mode in zip(stat_ix, (stat.S_IROTH, stat.S_IWOTH, stat.S_IXOTH)):
        if (external_attr & mode) > 0:
            oth_perm += mode_num

    return int('0o{0}{1}{2}'.format(user_perm, grp_perm, oth_perm), 8)
  
  if __name__ == "__main__":
    st_mode = (333534 >> 16) & 0xFFFF
    perm = permission(st_mode)
    (install_path / str(entry.filename)).chmod(perm)