Method test_realpath_permission

Lib/test/test_ntpath.py:934–976

(self)

    @unittest.skipUnless(HAVE_GETFINALPATHNAME, 'need _getfinalpathname')
    def test_realpath_permission(self):
        # Test whether python can resolve the real filename of a
        # shortened file name even if it does not have permission to access it.
        ABSTFN = ntpath.realpath(os_helper.TESTFN)

        os_helper.unlink(ABSTFN)
        os_helper.rmtree(ABSTFN)
        os.mkdir(ABSTFN)
        self.addCleanup(os_helper.rmtree, ABSTFN)

        test_file = ntpath.join(ABSTFN, "LongFileName123.txt")
        test_file_short = ntpath.join(ABSTFN, "LONGFI~1.TXT")

        with open(test_file, "wb") as f:
            f.write(b"content")
        # Automatic generation of short names may be disabled on
        # NTFS volumes for the sake of performance.
        # They're not supported at all on ReFS and exFAT.
        p = subprocess.run(
            # Try to set the short name manually.
            ['fsutil.exe', 'file', 'setShortName', test_file, 'LONGFI~1.TXT'],
            creationflags=subprocess.DETACHED_PROCESS
        )

        if p.returncode:
            raise unittest.SkipTest('failed to set short name')

        try:
            self.assertPathEqual(test_file, ntpath.realpath(test_file_short))
        except AssertionError:
            raise unittest.SkipTest('the filesystem seems to lack support for short filenames')

        # Deny the right to [S]YNCHRONIZE on the file to
        # force nt._getfinalpathname to fail with ERROR_ACCESS_DENIED.
        p = subprocess.run(
            ['icacls.exe', test_file, '/deny', '*S-1-5-32-545:(S)'],
            creationflags=subprocess.DETACHED_PROCESS
        )

        if p.returncode:
            raise unittest.SkipTest('failed to deny access to the test file')

        self.assertPathEqual(test_file, ntpath.realpath(test_file_short))

    def test_expandvars(self):
        with os_helper.EnvironmentVarGuard() as env: