Method test_pax_header_bad_formats

Lib/test/test_tarfile.py:1360–1400

(self)

            tar.close()

    def test_pax_header_bad_formats(self):
        # The fields from the pax header have priority over the
        # TarInfo.
        pax_header_replacements = (
            b" foo=bar\n",
            b"0 \n",
            b"1 \n",
            b"2 \n",
            b"3 =\n",
            b"4 =a\n",
            b"1000000 foo=bar\n",
            b"0 foo=bar\n",
            b"-12 foo=bar\n",
            b"000000000000000000000000036 foo=bar\n",
        )
        pax_headers = {"foo": "bar"}

        for replacement in pax_header_replacements:
            with self.subTest(header=replacement):
                tar = tarfile.open(tmpname, "w", format=tarfile.PAX_FORMAT,
                                   encoding="iso8859-1")
                try:
                    t = tarfile.TarInfo()
                    t.name = "pax"  # non-ASCII
                    t.uid = 1
                    t.pax_headers = pax_headers
                    tar.addfile(t)
                finally:
                    tar.close()

                with open(tmpname, "rb") as f:
                    data = f.read()
                    self.assertIn(b"11 foo=bar\n", data)
                    data = data.replace(b"11 foo=bar\n", replacement)

                with open(tmpname, "wb") as f:
                    f.truncate()
                    f.write(data)

                with self.assertRaisesRegex(tarfile.ReadError, r"method tar: ReadError\('invalid header'\)"):
                    tarfile.open(tmpname, encoding="iso8859-1")


class WriteTestBase(TarTest):