utils.py 文件源码

def is_executable_file(path):
    """Checks that path is an executable regular file, or a symlink towards one.

    This is roughly ``os.path isfile(path) and os.access(path, os.X_OK)``.
    """
    # follow symlinks,
    fpath = os.path.realpath(path)

    if not os.path.isfile(fpath):
        # non-files (directories, fifo, etc.)
        return False

    mode = os.stat(fpath).st_mode

    if (sys.platform.startswith('sunos')
            and os.getuid() == 0):
        # When root on Solaris, os.X_OK is True for *all* files, irregardless
        # of their executability -- instead, any permission bit of any user,
        # group, or other is fine enough.
        #
        # (This may be true for other "Unix98" OS's such as HP-UX and AIX)
        return bool(mode & (stat.S_IXUSR |
                            stat.S_IXGRP |
                            stat.S_IXOTH))

    return os.access(fpath, os.X_OK)