Function can_xattr

Lib/test/support/os_helper.py:222–252

()

def can_xattr():
    import tempfile
    global _can_xattr
    if _can_xattr is not None:
        return _can_xattr
    if not hasattr(os, "setxattr"):
        can = False
    else:
        import platform
        tmp_dir = tempfile.mkdtemp()
        tmp_fp, tmp_name = tempfile.mkstemp(dir=tmp_dir)
        try:
            with open(TESTFN, "wb") as fp:
                try:
                    # TESTFN & tempfile may use different file systems with
                    # different capabilities
                    os.setxattr(tmp_fp, b"user.test", b"")
                    os.setxattr(tmp_name, b"trusted.foo", b"42")
                    os.setxattr(fp.fileno(), b"user.test", b"")
                    # Kernels < 2.6.39 don't respect setxattr flags.
                    kernel_version = platform.release()
                    m = re.match(r"2.6.(\d{1,2})", kernel_version)
                    can = m is None or int(m.group(1)) >= 39
                except OSError:
                    can = False
        finally:
            unlink(TESTFN)
            unlink(tmp_name)
            rmdir(tmp_dir)
    _can_xattr = can
    return can


def skip_unless_xattr(test):