Da

✏️ Editing: test_tarfile.py

import sys
import os
import io
from hashlib import sha256
from contextlib import contextmanager
from random import Random
import pathlib
import shutil
import re
import warnings
import stat

import unittest
import unittest.mock
import tarfile

from test import support
from test.support import os_helper
from test.support import script_helper
from test.support import warnings_helper

# Check for our compression modules.
try:
    import gzip
except ImportError:
    gzip = None
try:
    import zlib
except ImportError:
    zlib = None
try:
    import bz2
except ImportError:
    bz2 = None
try:
    import lzma
except ImportError:
    lzma = None

def sha256sum(data):
    return sha256(data).hexdigest()

TEMPDIR = os.path.abspath(os_helper.TESTFN) + "-tardir"
tarextdir = TEMPDIR + '-extract-test'
tarname = support.findfile("testtar.tar")
gzipname = os.path.join(TEMPDIR, "testtar.tar.gz")
bz2name = os.path.join(TEMPDIR, "testtar.tar.bz2")
xzname = os.path.join(TEMPDIR, "testtar.tar.xz")
tmpname = os.path.join(TEMPDIR, "tmp.tar")
dotlessname = os.path.join(TEMPDIR, "testtar")

sha256_regtype = (
    "e09e4bc8b3c9d9177e77256353b36c159f5f040531bbd4b024a8f9b9196c71ce"
)
sha256_sparse = (
    "4f05a776071146756345ceee937b33fc5644f5a96b9780d1c7d6a32cdf164d7b"
)

class TarTest:
    tarname = tarname
    suffix = ''
    open = io.FileIO
    taropen = tarfile.TarFile.taropen

@property
    def mode(self):
        return self.prefix + self.suffix

@support.requires_gzip()
class GzipTest:
    tarname = gzipname
    suffix = 'gz'
    open = gzip.GzipFile if gzip else None
    taropen = tarfile.TarFile.gzopen

@support.requires_bz2()
class Bz2Test:
    tarname = bz2name
    suffix = 'bz2'
    open = bz2.BZ2File if bz2 else None
    taropen = tarfile.TarFile.bz2open

@support.requires_lzma()
class LzmaTest:
    tarname = xzname
    suffix = 'xz'
    open = lzma.LZMAFile if lzma else None
    taropen = tarfile.TarFile.xzopen

class ReadTest(TarTest):

prefix = "r:"

def setUp(self):
        self.tar = tarfile.open(self.tarname, mode=self.mode,
                                encoding="iso8859-1")

def tearDown(self):
        self.tar.close()

class UstarReadTest(ReadTest, unittest.TestCase):

def test_fileobj_regular_file(self):
        tarinfo = self.tar.getmember("ustar/regtype")
        with self.tar.extractfile(tarinfo) as fobj:
            data = fobj.read()
            self.assertEqual(len(data), tarinfo.size,
                    "regular file extraction failed")
            self.assertEqual(sha256sum(data), sha256_regtype,
                    "regular file extraction failed")

def test_fileobj_readlines(self):
        self.tar.extract("ustar/regtype", TEMPDIR, filter='data')
        tarinfo = self.tar.getmember("ustar/regtype")
        with open(os.path.join(TEMPDIR, "ustar/regtype"), "r") as fobj1:
            lines1 = fobj1.readlines()

with self.tar.extractfile(tarinfo) as fobj:
            fobj2 = io.TextIOWrapper(fobj)
            lines2 = fobj2.readlines()
            self.assertEqual(lines1, lines2,
                    "fileobj.readlines() failed")
            self.assertEqual(len(lines2), 114,
                    "fileobj.readlines() failed")
            self.assertEqual(lines2[83],
                    "I will gladly admit that Python is not the fastest "
                    "running scripting language.\n",
                    "fileobj.readlines() failed")

def test_fileobj_iter(self):
        self.tar.extract("ustar/regtype", TEMPDIR, filter='data')
        tarinfo = self.tar.getmember("ustar/regtype")
        with open(os.path.join(TEMPDIR, "ustar/regtype"), "r") as fobj1:
            lines1 = fobj1.readlines()
        with self.tar.extractfile(tarinfo) as fobj2:
            lines2 = list(io.TextIOWrapper(fobj2))
            self.assertEqual(lines1, lines2,
                    "fileobj.__iter__() failed")

def test_fileobj_seek(self):
        self.tar.extract("ustar/regtype", TEMPDIR,
                         filter='data')
        with open(os.path.join(TEMPDIR, "ustar/regtype"), "rb") as fobj:
            data = fobj.read()

tarinfo = self.tar.getmember("ustar/regtype")
        with self.tar.extractfile(tarinfo) as fobj:
            text = fobj.read()
            fobj.seek(0)
            self.assertEqual(0, fobj.tell(),
                         "seek() to file's start failed")
            fobj.seek(2048, 0)
            self.assertEqual(2048, fobj.tell(),
                         "seek() to absolute position failed")
            fobj.seek(-1024, 1)
            self.assertEqual(1024, fobj.tell(),
                         "seek() to negative relative position failed")
            fobj.seek(1024, 1)
            self.assertEqual(2048, fobj.tell(),
                         "seek() to positive relative position failed")
            s = fobj.read(10)
            self.assertEqual(s, data[2048:2058],
                         "read() after seek failed")
            fobj.seek(0, 2)
            self.assertEqual(tarinfo.size, fobj.tell(),
                         "seek() to file's end failed")
            self.assertEqual(fobj.read(), b"",
                         "read() at file's end did not return empty string")
            fobj.seek(-tarinfo.size, 2)
            self.assertEqual(0, fobj.tell(),
                         "relative seek() to file's end failed")
            fobj.seek(512)
            s1 = fobj.readlines()
            fobj.seek(512)
            s2 = fobj.readlines()
            self.assertEqual(s1, s2,
                         "readlines() after seek failed")
            fobj.seek(0)
            self.assertEqual(len(fobj.readline()), fobj.tell(),
                         "tell() after readline() failed")
            fobj.seek(512)
            self.assertEqual(len(fobj.readline()) + 512, fobj.tell(),
                         "tell() after seek() and readline() failed")
            fobj.seek(0)
            line = fobj.readline()
            self.assertEqual(fobj.read(), data[len(line):],
                         "read() after readline() failed")

def test_fileobj_text(self):
        with self.tar.extractfile("ustar/regtype") as fobj:
            fobj = io.TextIOWrapper(fobj)
            data = fobj.read().encode("iso8859-1")
            self.assertEqual(sha256sum(data), sha256_regtype)
            try:
                fobj.seek(100)
            except AttributeError:
                # Issue #13815: seek() complained about a missing
                # flush() method.
                self.fail("seeking failed in text mode")

# Test if symbolic and hard links are resolved by extractfile().  The
    # test link members each point to a regular member whose data is
    # supposed to be exported.
    def _test_fileobj_link(self, lnktype, regtype):
        with self.tar.extractfile(lnktype) as a, \
             self.tar.extractfile(regtype) as b:
            self.assertEqual(a.name, b.name)

def test_fileobj_link1(self):
        self._test_fileobj_link("ustar/lnktype", "ustar/regtype")

def test_fileobj_link2(self):
        self._test_fileobj_link("./ustar/linktest2/lnktype",
                                "ustar/linktest1/regtype")

def test_fileobj_symlink1(self):
        self._test_fileobj_link("ustar/symtype", "ustar/regtype")

def test_fileobj_symlink2(self):
        self._test_fileobj_link("./ustar/linktest2/symtype",
                                "ustar/linktest1/regtype")

def test_issue14160(self):
        self._test_fileobj_link("symtype2", "ustar/regtype")

def test_add_dir_getmember(self):
        # bpo-21987
        self.add_dir_and_getmember('bar')
        self.add_dir_and_getmember('a'*101)

@unittest.skipUnless(hasattr(os, "getuid") and hasattr(os, "getgid"),
                         "Missing getuid or getgid implementation")
    def add_dir_and_getmember(self, name):
        def filter(tarinfo):
            tarinfo.uid = tarinfo.gid = 100
            return tarinfo

with os_helper.temp_cwd():
            with tarfile.open(tmpname, 'w') as tar:
                tar.format = tarfile.USTAR_FORMAT
                try:
                    os.mkdir(name)
                    tar.add(name, filter=filter)
                finally:
                    os.rmdir(name)
            with tarfile.open(tmpname) as tar:
                self.assertEqual(
                    tar.getmember(name),
                    tar.getmember(name + '/')
                )

class GzipUstarReadTest(GzipTest, UstarReadTest):
    pass

class Bz2UstarReadTest(Bz2Test, UstarReadTest):
    pass

class LzmaUstarReadTest(LzmaTest, UstarReadTest):
    pass

class ListTest(ReadTest, unittest.TestCase):

# Override setUp to use default encoding (UTF-8)
    def setUp(self):
        self.tar = tarfile.open(self.tarname, mode=self.mode)

def test_list(self):
        tio = io.TextIOWrapper(io.BytesIO(), 'ascii', newline='\n')
        with support.swap_attr(sys, 'stdout', tio):
            self.tar.list(verbose=False)
        out = tio.detach().getvalue()
        self.assertIn(b'ustar/conttype', out)
        self.assertIn(b'ustar/regtype', out)
        self.assertIn(b'ustar/lnktype', out)
        self.assertIn(b'ustar' + (b'/12345' * 40) + b'67/longname', out)
        self.assertIn(b'./ustar/linktest2/symtype', out)
        self.assertIn(b'./ustar/linktest2/lnktype', out)
        # Make sure it puts trailing slash for directory
        self.assertIn(b'ustar/dirtype/', out)
        self.assertIn(b'ustar/dirtype-with-size/', out)
        # Make sure it is able to print unencodable characters
        def conv(b):
            s = b.decode(self.tar.encoding, 'surrogateescape')
            return s.encode('ascii', 'backslashreplace')
        self.assertIn(conv(b'ustar/umlauts-\xc4\xd6\xdc\xe4\xf6\xfc\xdf'), out)
        self.assertIn(conv(b'misc/regtype-hpux-signed-chksum-'
                           b'\xc4\xd6\xdc\xe4\xf6\xfc\xdf'), out)
        self.assertIn(conv(b'misc/regtype-old-v7-signed-chksum-'
                           b'\xc4\xd6\xdc\xe4\xf6\xfc\xdf'), out)
        self.assertIn(conv(b'pax/bad-pax-\xe4\xf6\xfc'), out)
        self.assertIn(conv(b'pax/hdrcharset-\xe4\xf6\xfc'), out)
        # Make sure it prints files separated by one newline without any
        # 'ls -l'-like accessories if verbose flag is not being used
        # ...
        # ustar/conttype
        # ustar/regtype
        # ...
        self.assertRegex(out, br'ustar/conttype ?\r?\n'
                              br'ustar/regtype ?\r?\n')
        # Make sure it does not print the source of link without verbose flag
        self.assertNotIn(b'link to', out)
        self.assertNotIn(b'->', out)

def test_list_verbose(self):
        tio = io.TextIOWrapper(io.BytesIO(), 'ascii', newline='\n')
        with support.swap_attr(sys, 'stdout', tio):
            self.tar.list(verbose=True)
        out = tio.detach().getvalue()
        # Make sure it prints files separated by one newline with 'ls -l'-like
        # accessories if verbose flag is being used
        # ...
        # ?rw-r--r-- tarfile/tarfile     7011 2003-01-06 07:19:43 ustar/conttype
        # ?rw-r--r-- tarfile/tarfile     7011 2003-01-06 07:19:43 ustar/regtype
        # ...
        self.assertRegex(out, (br'\?rw-r--r-- tarfile/tarfile\s+7011 '
                               br'\d{4}-\d\d-\d\d\s+\d\d:\d\d:\d\d '
                               br'ustar/\w+type ?\r?\n') * 2)
        # Make sure it prints the source of link with verbose flag
        self.assertIn(b'ustar/symtype -> regtype', out)
        self.assertIn(b'./ustar/linktest2/symtype -> ../linktest1/regtype', out)
        self.assertIn(b'./ustar/linktest2/lnktype link to '
                      b'./ustar/linktest1/regtype', out)
        self.assertIn(b'gnu' + (b'/123' * 125) + b'/longlink link to gnu' +
                      (b'/123' * 125) + b'/longname', out)
        self.assertIn(b'pax' + (b'/123' * 125) + b'/longlink link to pax' +
                      (b'/123' * 125) + b'/longname', out)

def test_list_members(self):
        tio = io.TextIOWrapper(io.BytesIO(), 'ascii', newline='\n')
        def members(tar):
            for tarinfo in tar.getmembers():
                if 'reg' in tarinfo.name:
                    yield tarinfo
        with support.swap_attr(sys, 'stdout', tio):
            self.tar.list(verbose=False, members=members(self.tar))
        out = tio.detach().getvalue()
        self.assertIn(b'ustar/regtype', out)
        self.assertNotIn(b'ustar/conttype', out)

class GzipListTest(GzipTest, ListTest):
    pass

class Bz2ListTest(Bz2Test, ListTest):
    pass

class LzmaListTest(LzmaTest, ListTest):
    pass

class CommonReadTest(ReadTest):

def test_is_tarfile_erroneous(self):
        with open(tmpname, "wb"):
            pass

# is_tarfile works on filenames
        self.assertFalse(tarfile.is_tarfile(tmpname))

# is_tarfile works on path-like objects
        self.assertFalse(tarfile.is_tarfile(pathlib.Path(tmpname)))

# is_tarfile works on file objects
        with open(tmpname, "rb") as fobj:
            self.assertFalse(tarfile.is_tarfile(fobj))

# is_tarfile works on file-like objects
        self.assertFalse(tarfile.is_tarfile(io.BytesIO(b"invalid")))

def test_is_tarfile_valid(self):
        # is_tarfile works on filenames
        self.assertTrue(tarfile.is_tarfile(self.tarname))

# is_tarfile works on path-like objects
        self.assertTrue(tarfile.is_tarfile(pathlib.Path(self.tarname)))

# is_tarfile works on file objects
        with open(self.tarname, "rb") as fobj:
            self.assertTrue(tarfile.is_tarfile(fobj))

# is_tarfile works on file-like objects
        with open(self.tarname, "rb") as fobj:
            self.assertTrue(tarfile.is_tarfile(io.BytesIO(fobj.read())))

def test_empty_tarfile(self):
        # Test for issue6123: Allow opening empty archives.
        # This test checks if tarfile.open() is able to open an empty tar
        # archive successfully. Note that an empty tar archive is not the
        # same as an empty file!
        with tarfile.open(tmpname, self.mode.replace("r", "w")):
            pass
        try:
            tar = tarfile.open(tmpname, self.mode)
            tar.getnames()
        except tarfile.ReadError:
            self.fail("tarfile.open() failed on empty archive")
        else:
            self.assertListEqual(tar.getmembers(), [])
        finally:
            tar.close()

def test_non_existent_tarfile(self):
        # Test for issue11513: prevent non-existent gzipped tarfiles raising
        # multiple exceptions.
        with self.assertRaisesRegex(FileNotFoundError, "xxx"):
            tarfile.open("xxx", self.mode)

def test_null_tarfile(self):
        # Test for issue6123: Allow opening empty archives.
        # This test guarantees that tarfile.open() does not treat an empty
        # file as an empty tar archive.
        with open(tmpname, "wb"):
            pass
        self.assertRaises(tarfile.ReadError, tarfile.open, tmpname, self.mode)
        self.assertRaises(tarfile.ReadError, tarfile.open, tmpname)

def test_ignore_zeros(self):
        # Test TarFile's ignore_zeros option.
        # generate 512 pseudorandom bytes
        data = Random(0).randbytes(512)
        for char in (b'\0', b'a'):
            # Test if EOFHeaderError ('\0') and InvalidHeaderError ('a')
            # are ignored correctly.
            with self.open(tmpname, "w") as fobj:
                fobj.write(char * 1024)
                tarinfo = tarfile.TarInfo("foo")
                tarinfo.size = len(data)
                fobj.write(tarinfo.tobuf())
                fobj.write(data)

tar = tarfile.open(tmpname, mode="r", ignore_zeros=True)
            try:
                self.assertListEqual(tar.getnames(), ["foo"],
                    "ignore_zeros=True should have skipped the %r-blocks" %
                    char)
            finally:
                tar.close()

def test_premature_end_of_archive(self):
        for size in (512, 600, 1024, 1200):
            with tarfile.open(tmpname, "w:") as tar:
                t = tarfile.TarInfo("foo")
                t.size = 1024
                tar.addfile(t, io.BytesIO(b"a" * 1024))

with open(tmpname, "r+b") as fobj:
                fobj.truncate(size)

with tarfile.open(tmpname) as tar:
                with self.assertRaisesRegex(tarfile.ReadError, "unexpected end of data"):
                    for t in tar:
                        pass

with tarfile.open(tmpname) as tar:
                t = tar.next()

with self.assertRaisesRegex(tarfile.ReadError, "unexpected end of data"):
                    tar.extract(t, TEMPDIR, filter='data')

with self.assertRaisesRegex(tarfile.ReadError, "unexpected end of data"):
                    tar.extractfile(t).read()

def test_length_zero_header(self):
        # bpo-39017 (CVE-2019-20907): reading a zero-length header should fail
        # with an exception
        with self.assertRaisesRegex(tarfile.ReadError, "file could not be opened successfully"):
            with tarfile.open(support.findfile('recursion.tar')) as tar:
                pass

class MiscReadTestBase(CommonReadTest):
    def requires_name_attribute(self):
        pass

def test_no_name_argument(self):
        self.requires_name_attribute()
        with open(self.tarname, "rb") as fobj:
            self.assertIsInstance(fobj.name, str)
            with tarfile.open(fileobj=fobj, mode=self.mode) as tar:
                self.assertIsInstance(tar.name, str)
                self.assertEqual(tar.name, os.path.abspath(fobj.name))

def test_no_name_attribute(self):
        with open(self.tarname, "rb") as fobj:
            data = fobj.read()
        fobj = io.BytesIO(data)
        self.assertRaises(AttributeError, getattr, fobj, "name")
        tar = tarfile.open(fileobj=fobj, mode=self.mode)
        self.assertIsNone(tar.name)

def test_empty_name_attribute(self):
        with open(self.tarname, "rb") as fobj:
            data = fobj.read()
        fobj = io.BytesIO(data)
        fobj.name = ""
        with tarfile.open(fileobj=fobj, mode=self.mode) as tar:
            self.assertIsNone(tar.name)

def test_int_name_attribute(self):
        # Issue 21044: tarfile.open() should handle fileobj with an integer
        # 'name' attribute.
        fd = os.open(self.tarname, os.O_RDONLY)
        with open(fd, 'rb') as fobj:
            self.assertIsInstance(fobj.name, int)
            with tarfile.open(fileobj=fobj, mode=self.mode) as tar:
                self.assertIsNone(tar.name)

def test_bytes_name_attribute(self):
        self.requires_name_attribute()
        tarname = os.fsencode(self.tarname)
        with open(tarname, 'rb') as fobj:
            self.assertIsInstance(fobj.name, bytes)
            with tarfile.open(fileobj=fobj, mode=self.mode) as tar:
                self.assertIsInstance(tar.name, bytes)
                self.assertEqual(tar.name, os.path.abspath(fobj.name))

def test_pathlike_name(self):
        tarname = pathlib.Path(self.tarname)
        with tarfile.open(tarname, mode=self.mode) as tar:
            self.assertIsInstance(tar.name, str)
            self.assertEqual(tar.name, os.path.abspath(os.fspath(tarname)))
        with self.taropen(tarname) as tar:
            self.assertIsInstance(tar.name, str)
            self.assertEqual(tar.name, os.path.abspath(os.fspath(tarname)))
        with tarfile.TarFile.open(tarname, mode=self.mode) as tar:
            self.assertIsInstance(tar.name, str)
            self.assertEqual(tar.name, os.path.abspath(os.fspath(tarname)))
        if self.suffix == '':
            with tarfile.TarFile(tarname, mode='r') as tar:
                self.assertIsInstance(tar.name, str)
                self.assertEqual(tar.name, os.path.abspath(os.fspath(tarname)))

def test_illegal_mode_arg(self):
        with open(tmpname, 'wb'):
            pass
        with self.assertRaisesRegex(ValueError, 'mode must be '):
            tar = self.taropen(tmpname, 'q')
        with self.assertRaisesRegex(ValueError, 'mode must be '):
            tar = self.taropen(tmpname, 'rw')
        with self.assertRaisesRegex(ValueError, 'mode must be '):
            tar = self.taropen(tmpname, '')

def test_fileobj_with_offset(self):
        # Skip the first member and store values from the second member
        # of the testtar.
        tar = tarfile.open(self.tarname, mode=self.mode)
        try:
            tar.next()
            t = tar.next()
            name = t.name
            offset = t.offset
            with tar.extractfile(t) as f:
                data = f.read()
        finally:
            tar.close()

# Open the testtar and seek to the offset of the second member.
        with self.open(self.tarname) as fobj:
            fobj.seek(offset)

# Test if the tarfile starts with the second member.
            with tar.open(self.tarname, mode="r:", fileobj=fobj) as tar:
                t = tar.next()
                self.assertEqual(t.name, name)
                # Read to the end of fileobj and test if seeking back to the
                # beginning works.
                tar.getmembers()
                self.assertEqual(tar.extractfile(t).read(), data,
                        "seek back did not work")

def test_fail_comp(self):
        # For Gzip and Bz2 Tests: fail with a ReadError on an uncompressed file.
        self.assertRaises(tarfile.ReadError, tarfile.open, tarname, self.mode)
        with open(tarname, "rb") as fobj:
            self.assertRaises(tarfile.ReadError, tarfile.open,
                              fileobj=fobj, mode=self.mode)

def test_v7_dirtype(self):
        # Test old style dirtype member (bug #1336623):
        # Old V7 tars create directory members using an AREGTYPE
        # header with a "/" appended to the filename field.
        tarinfo = self.tar.getmember("misc/dirtype-old-v7")
        self.assertEqual(tarinfo.type, tarfile.DIRTYPE,
                "v7 dirtype failed")

def test_xstar_type(self):
        # The xstar format stores extra atime and ctime fields inside the
        # space reserved for the prefix field. The prefix field must be
        # ignored in this case, otherwise it will mess up the name.
        try:
            self.tar.getmember("misc/regtype-xstar")
        except KeyError:
            self.fail("failed to find misc/regtype-xstar (mangled prefix?)")

def test_check_members(self):
        for tarinfo in self.tar:
            self.assertEqual(int(tarinfo.mtime), 0o7606136617,
                    "wrong mtime for %s" % tarinfo.name)
            if not tarinfo.name.startswith("ustar/"):
                continue
            self.assertEqual(tarinfo.uname, "tarfile",
                    "wrong uname for %s" % tarinfo.name)

def test_find_members(self):
        self.assertEqual(self.tar.getmembers()[-1].name, "misc/eof",
                "could not find all members")

@unittest.skipUnless(hasattr(os, "link"),
                         "Missing hardlink implementation")
    @os_helper.skip_unless_symlink
    def test_extract_hardlink(self):
        # Test hardlink extraction (e.g. bug #857297).
        with tarfile.open(tarname, errorlevel=1, encoding="iso8859-1") as tar:
            tar.extract("ustar/regtype", TEMPDIR, filter='data')
            self.addCleanup(os_helper.unlink, os.path.join(TEMPDIR, "ustar/regtype"))

tar.extract("ustar/lnktype", TEMPDIR, filter='data')
            self.addCleanup(os_helper.unlink, os.path.join(TEMPDIR, "ustar/lnktype"))
            with open(os.path.join(TEMPDIR, "ustar/lnktype"), "rb") as f:
                data = f.read()
            self.assertEqual(sha256sum(data), sha256_regtype)

tar.extract("ustar/symtype", TEMPDIR, filter='data')
            self.addCleanup(os_helper.unlink, os.path.join(TEMPDIR, "ustar/symtype"))
            with open(os.path.join(TEMPDIR, "ustar/symtype"), "rb") as f:
                data = f.read()
            self.assertEqual(sha256sum(data), sha256_regtype)

def test_extractall(self):
        # Test if extractall() correctly restores directory permissions
        # and times (see issue1735).
        tar = tarfile.open(tarname, encoding="iso8859-1")
        DIR = os.path.join(TEMPDIR, "extractall")
        os.mkdir(DIR)
        try:
            directories = [t for t in tar if t.isdir()]
            tar.extractall(DIR, directories, filter='fully_trusted')
            for tarinfo in directories:
                path = os.path.join(DIR, tarinfo.name)
                if sys.platform != "win32":
                    # Win32 has no support for fine grained permissions.
                    self.assertEqual(tarinfo.mode & 0o777,
                                     os.stat(path).st_mode & 0o777,
                                     tarinfo.name)
                def format_mtime(mtime):
                    if isinstance(mtime, float):
                        return "{} ({})".format(mtime, mtime.hex())
                    else:
                        return "{!r} (int)".format(mtime)
                file_mtime = os.path.getmtime(path)
                errmsg = "tar mtime {0} != file time {1} of path {2!a}".format(
                    format_mtime(tarinfo.mtime),
                    format_mtime(file_mtime),
                    path)
                self.assertEqual(tarinfo.mtime, file_mtime, errmsg)
        finally:
            tar.close()
            os_helper.rmtree(DIR)

def test_extract_directory(self):
        dirtype = "ustar/dirtype"
        DIR = os.path.join(TEMPDIR, "extractdir")
        os.mkdir(DIR)
        try:
            with tarfile.open(tarname, encoding="iso8859-1") as tar:
                tarinfo = tar.getmember(dirtype)
                tar.extract(tarinfo, path=DIR, filter='fully_trusted')
                extracted = os.path.join(DIR, dirtype)
                self.assertEqual(os.path.getmtime(extracted), tarinfo.mtime)
                if sys.platform != "win32":
                    self.assertEqual(os.stat(extracted).st_mode & 0o777, 0o755)
        finally:
            os_helper.rmtree(DIR)

def test_extractall_pathlike_name(self):
        DIR = pathlib.Path(TEMPDIR) / "extractall"
        with os_helper.temp_dir(DIR), \
             tarfile.open(tarname, encoding="iso8859-1") as tar:
            directories = [t for t in tar if t.isdir()]
            tar.extractall(DIR, directories, filter='fully_trusted')
            for tarinfo in directories:
                path = DIR / tarinfo.name
                self.assertEqual(os.path.getmtime(path), tarinfo.mtime)

def test_extract_pathlike_name(self):
        dirtype = "ustar/dirtype"
        DIR = pathlib.Path(TEMPDIR) / "extractall"
        with os_helper.temp_dir(DIR), \
             tarfile.open(tarname, encoding="iso8859-1") as tar:
            tarinfo = tar.getmember(dirtype)
            tar.extract(tarinfo, path=DIR, filter='fully_trusted')
            extracted = DIR / dirtype
            self.assertEqual(os.path.getmtime(extracted), tarinfo.mtime)

def test_init_close_fobj(self):
        # Issue #7341: Close the internal file object in the TarFile
        # constructor in case of an error. For the test we rely on
        # the fact that opening an empty file raises a ReadError.
        empty = os.path.join(TEMPDIR, "empty")
        with open(empty, "wb") as fobj:
            fobj.write(b"")

try:
            tar = object.__new__(tarfile.TarFile)
            try:
                tar.__init__(empty)
            except tarfile.ReadError:
                self.assertTrue(tar.fileobj.closed)
            else:
                self.fail("ReadError not raised")
        finally:
            os_helper.unlink(empty)

def test_parallel_iteration(self):
        # Issue #16601: Restarting iteration over tarfile continued
        # from where it left off.
        with tarfile.open(self.tarname) as tar:
            for m1, m2 in zip(tar, tar):
                self.assertEqual(m1.offset, m2.offset)
                self.assertEqual(m1.get_info(), m2.get_info())

@unittest.skipIf(zlib is None, "requires zlib")
    def test_zlib_error_does_not_leak(self):
        # bpo-39039: tarfile.open allowed zlib exceptions to bubble up when
        # parsing certain types of invalid data
        with unittest.mock.patch("tarfile.TarInfo.fromtarfile") as mock:
            mock.side_effect = zlib.error
            with self.assertRaises(tarfile.ReadError):
                tarfile.open(self.tarname)

class MiscReadTest(MiscReadTestBase, unittest.TestCase):
    test_fail_comp = None

class GzipMiscReadTest(GzipTest, MiscReadTestBase, unittest.TestCase):
    pass

class Bz2MiscReadTest(Bz2Test, MiscReadTestBase, unittest.TestCase):
    def requires_name_attribute(self):
        self.skipTest("BZ2File have no name attribute")

class LzmaMiscReadTest(LzmaTest, MiscReadTestBase, unittest.TestCase):
    def requires_name_attribute(self):
        self.skipTest("LZMAFile have no name attribute")

class StreamReadTest(CommonReadTest, unittest.TestCase):

prefix="r|"

def test_read_through(self):
        # Issue #11224: A poorly designed _FileInFile.read() method
        # caused seeking errors with stream tar files.
        for tarinfo in self.tar:
            if not tarinfo.isreg():
                continue
            with self.tar.extractfile(tarinfo) as fobj:
                while True:
                    try:
                        buf = fobj.read(512)
                    except tarfile.StreamError:
                        self.fail("simple read-through using "
                                  "TarFile.extractfile() failed")
                    if not buf:
                        break

def test_fileobj_regular_file(self):
        tarinfo = self.tar.next() # get "regtype" (can't use getmember)
        with self.tar.extractfile(tarinfo) as fobj:
            data = fobj.read()
        self.assertEqual(len(data), tarinfo.size,
                "regular file extraction failed")
        self.assertEqual(sha256sum(data), sha256_regtype,
                "regular file extraction failed")

def test_provoke_stream_error(self):
        tarinfos = self.tar.getmembers()
        with self.tar.extractfile(tarinfos[0]) as f: # read the first member
            self.assertRaises(tarfile.StreamError, f.read)

def test_compare_members(self):
        tar1 = tarfile.open(tarname, encoding="iso8859-1")
        try:
            tar2 = self.tar

while True:
                t1 = tar1.next()
                t2 = tar2.next()
                if t1 is None:
                    break
                self.assertIsNotNone(t2, "stream.next() failed.")

if t2.islnk() or t2.issym():
                    with self.assertRaises(tarfile.StreamError):
                        tar2.extractfile(t2)
                    continue

v1 = tar1.extractfile(t1)
                v2 = tar2.extractfile(t2)
                if v1 is None:
                    continue
                self.assertIsNotNone(v2, "stream.extractfile() failed")
                self.assertEqual(v1.read(), v2.read(),
                        "stream extraction failed")
        finally:
            tar1.close()

class GzipStreamReadTest(GzipTest, StreamReadTest):
    pass

class Bz2StreamReadTest(Bz2Test, StreamReadTest):
    pass

class LzmaStreamReadTest(LzmaTest, StreamReadTest):
    pass

class DetectReadTest(TarTest, unittest.TestCase):
    def _testfunc_file(self, name, mode):
        try:
            tar = tarfile.open(name, mode)
        except tarfile.ReadError as e:
            self.fail()
        else:
            tar.close()

def _testfunc_fileobj(self, name, mode):
        try:
            with open(name, "rb") as f:
                tar = tarfile.open(name, mode, fileobj=f)
        except tarfile.ReadError as e:
            self.fail()
        else:
            tar.close()

def _test_modes(self, testfunc):
        if self.suffix:
            with self.assertRaises(tarfile.ReadError):
                tarfile.open(tarname, mode="r:" + self.suffix)
            with self.assertRaises(tarfile.ReadError):
                tarfile.open(tarname, mode="r|" + self.suffix)
            with self.assertRaises(tarfile.ReadError):
                tarfile.open(self.tarname, mode="r:")
            with self.assertRaises(tarfile.ReadError):
                tarfile.open(self.tarname, mode="r|")
        testfunc(self.tarname, "r")
        testfunc(self.tarname, "r:" + self.suffix)
        testfunc(self.tarname, "r:*")
        testfunc(self.tarname, "r|" + self.suffix)
        testfunc(self.tarname, "r|*")

def test_detect_file(self):
        self._test_modes(self._testfunc_file)

def test_detect_fileobj(self):
        self._test_modes(self._testfunc_fileobj)

class GzipDetectReadTest(GzipTest, DetectReadTest):
    pass

class Bz2DetectReadTest(Bz2Test, DetectReadTest):
    def test_detect_stream_bz2(self):
        # Originally, tarfile's stream detection looked for the string
        # "BZh91" at the start of the file. This is incorrect because
        # the '9' represents the blocksize (900,000 bytes). If the file was
        # compressed using another blocksize autodetection fails.
        with open(tarname, "rb") as fobj:
            data = fobj.read()

# Compress with blocksize 100,000 bytes, the file starts with "BZh11".
        with bz2.BZ2File(tmpname, "wb", compresslevel=1) as fobj:
            fobj.write(data)

self._testfunc_file(tmpname, "r|*")

class LzmaDetectReadTest(LzmaTest, DetectReadTest):
    pass

class MemberReadTest(ReadTest, unittest.TestCase):

def _test_member(self, tarinfo, chksum=None, **kwargs):
        if chksum is not None:
            with self.tar.extractfile(tarinfo) as f:
                self.assertEqual(sha256sum(f.read()), chksum,
                        "wrong sha256sum for %s" % tarinfo.name)

kwargs["mtime"] = 0o7606136617
        kwargs["uid"] = 1000
        kwargs["gid"] = 100
        if "old-v7" not in tarinfo.name:
            # V7 tar can't handle alphabetic owners.
            kwargs["uname"] = "tarfile"
            kwargs["gname"] = "tarfile"
        for k, v in kwargs.items():
            self.assertEqual(getattr(tarinfo, k), v,
                    "wrong value in %s field of %s" % (k, tarinfo.name))

def test_find_regtype(self):
        tarinfo = self.tar.getmember("ustar/regtype")
        self._test_member(tarinfo, size=7011, chksum=sha256_regtype)

def test_find_conttype(self):
        tarinfo = self.tar.getmember("ustar/conttype")
        self._test_member(tarinfo, size=7011, chksum=sha256_regtype)

def test_find_dirtype(self):
        tarinfo = self.tar.getmember("ustar/dirtype")
        self._test_member(tarinfo, size=0)

def test_find_dirtype_with_size(self):
        tarinfo = self.tar.getmember("ustar/dirtype-with-size")
        self._test_member(tarinfo, size=255)

def test_find_lnktype(self):
        tarinfo = self.tar.getmember("ustar/lnktype")
        self._test_member(tarinfo, size=0, linkname="ustar/regtype")

def test_find_symtype(self):
        tarinfo = self.tar.getmember("ustar/symtype")
        self._test_member(tarinfo, size=0, linkname="regtype")

def test_find_blktype(self):
        tarinfo = self.tar.getmember("ustar/blktype")
        self._test_member(tarinfo, size=0, devmajor=3, devminor=0)

def test_find_chrtype(self):
        tarinfo = self.tar.getmember("ustar/chrtype")
        self._test_member(tarinfo, size=0, devmajor=1, devminor=3)

def test_find_fifotype(self):
        tarinfo = self.tar.getmember("ustar/fifotype")
        self._test_member(tarinfo, size=0)

def test_find_sparse(self):
        tarinfo = self.tar.getmember("ustar/sparse")
        self._test_member(tarinfo, size=86016, chksum=sha256_sparse)

def test_find_gnusparse(self):
        tarinfo = self.tar.getmember("gnu/sparse")
        self._test_member(tarinfo, size=86016, chksum=sha256_sparse)

def test_find_gnusparse_00(self):
        tarinfo = self.tar.getmember("gnu/sparse-0.0")
        self._test_member(tarinfo, size=86016, chksum=sha256_sparse)

def test_find_gnusparse_01(self):
        tarinfo = self.tar.getmember("gnu/sparse-0.1")
        self._test_member(tarinfo, size=86016, chksum=sha256_sparse)

def test_find_gnusparse_10(self):
        tarinfo = self.tar.getmember("gnu/sparse-1.0")
        self._test_member(tarinfo, size=86016, chksum=sha256_sparse)

def test_find_umlauts(self):
        tarinfo = self.tar.getmember("ustar/umlauts-"
                                     "\xc4\xd6\xdc\xe4\xf6\xfc\xdf")
        self._test_member(tarinfo, size=7011, chksum=sha256_regtype)

def test_find_ustar_longname(self):
        name = "ustar/" + "12345/" * 39 + "1234567/longname"
        self.assertIn(name, self.tar.getnames())

def test_find_regtype_oldv7(self):
        tarinfo = self.tar.getmember("misc/regtype-old-v7")
        self._test_member(tarinfo, size=7011, chksum=sha256_regtype)

def test_find_pax_umlauts(self):
        self.tar.close()
        self.tar = tarfile.open(self.tarname, mode=self.mode,
                                encoding="iso8859-1")
        tarinfo = self.tar.getmember("pax/umlauts-"
                                     "\xc4\xd6\xdc\xe4\xf6\xfc\xdf")
        self._test_member(tarinfo, size=7011, chksum=sha256_regtype)

class LongnameTest:

def test_read_longname(self):
        # Test reading of longname (bug #1471427).
        longname = self.subdir + "/" + "123/" * 125 + "longname"
        try:
            tarinfo = self.tar.getmember(longname)
        except KeyError:
            self.fail("longname not found")
        self.assertNotEqual(tarinfo.type, tarfile.DIRTYPE,
                "read longname as dirtype")

def test_read_longlink(self):
        longname = self.subdir + "/" + "123/" * 125 + "longname"
        longlink = self.subdir + "/" + "123/" * 125 + "longlink"
        try:
            tarinfo = self.tar.getmember(longlink)
        except KeyError:
            self.fail("longlink not found")
        self.assertEqual(tarinfo.linkname, longname, "linkname wrong")

def test_truncated_longname(self):
        longname = self.subdir + "/" + "123/" * 125 + "longname"
        tarinfo = self.tar.getmember(longname)
        offset = tarinfo.offset
        self.tar.fileobj.seek(offset)
        fobj = io.BytesIO(self.tar.fileobj.read(3 * 512))
        with self.assertRaises(tarfile.ReadError):
            tarfile.open(name="foo.tar", fileobj=fobj)

def test_header_offset(self):
        # Test if the start offset of the TarInfo object includes
        # the preceding extended header.
        longname = self.subdir + "/" + "123/" * 125 + "longname"
        offset = self.tar.getmember(longname).offset
        with open(tarname, "rb") as fobj:
            fobj.seek(offset)
            tarinfo = tarfile.TarInfo.frombuf(fobj.read(512),
                                              "iso8859-1", "strict")
            self.assertEqual(tarinfo.type, self.longnametype)

def test_longname_directory(self):
        # Test reading a longlink directory. Issue #47231.
        longdir = ('a' * 101) + '/'
        with os_helper.temp_cwd():
            with tarfile.open(tmpname, 'w') as tar:
                tar.format = self.format
                try:
                    os.mkdir(longdir)
                    tar.add(longdir)
                finally:
                    os.rmdir(longdir)
            with tarfile.open(tmpname) as tar:
                self.assertIsNotNone(tar.getmember(longdir))
                self.assertIsNotNone(tar.getmember(longdir.removesuffix('/')))

class GNUReadTest(LongnameTest, ReadTest, unittest.TestCase):

subdir = "gnu"
    longnametype = tarfile.GNUTYPE_LONGNAME
    format = tarfile.GNU_FORMAT

# Since 3.2 tarfile is supposed to accurately restore sparse members and
    # produce files with holes. This is what we actually want to test here.
    # Unfortunately, not all platforms/filesystems support sparse files, and
    # even on platforms that do it is non-trivial to make reliable assertions
    # about holes in files. Therefore, we first do one basic test which works
    # an all platforms, and after that a test that will work only on
    # platforms/filesystems that prove to support sparse files.
    def _test_sparse_file(self, name):
        self.tar.extract(name, TEMPDIR, filter='data')
        filename = os.path.join(TEMPDIR, name)
        with open(filename, "rb") as fobj:
            data = fobj.read()
        self.assertEqual(sha256sum(data), sha256_sparse,
                "wrong sha256sum for %s" % name)

if self._fs_supports_holes():
            s = os.stat(filename)
            self.assertLess(s.st_blocks * 512, s.st_size)

def test_sparse_file_old(self):
        self._test_sparse_file("gnu/sparse")

def test_sparse_file_00(self):
        self._test_sparse_file("gnu/sparse-0.0")

def test_sparse_file_01(self):
        self._test_sparse_file("gnu/sparse-0.1")

def test_sparse_file_10(self):
        self._test_sparse_file("gnu/sparse-1.0")

@staticmethod
    def _fs_supports_holes():
        # Return True if the platform knows the st_blocks stat attribute and
        # uses st_blocks units of 512 bytes, and if the filesystem is able to
        # store holes of 4 KiB in files.
        #
        # The function returns False if page size is larger than 4 KiB.
        # For example, ppc64 uses pages of 64 KiB.
        if sys.platform.startswith("linux"):
            # Linux evidentially has 512 byte st_blocks units.
            name = os.path.join(TEMPDIR, "sparse-test")
            with open(name, "wb") as fobj:
                # Seek to "punch a hole" of 4 KiB
                fobj.seek(4096)
                fobj.write(b'x' * 4096)
                fobj.truncate()
            s = os.stat(name)
            os_helper.unlink(name)
            return (s.st_blocks * 512 < s.st_size)
        else:
            return False

class PaxReadTest(LongnameTest, ReadTest, unittest.TestCase):

subdir = "pax"
    longnametype = tarfile.XHDTYPE
    format = tarfile.PAX_FORMAT

def test_pax_global_headers(self):
        tar = tarfile.open(tarname, encoding="iso8859-1")
        try:
            tarinfo = tar.getmember("pax/regtype1")
            self.assertEqual(tarinfo.uname, "foo")
            self.assertEqual(tarinfo.gname, "bar")
            self.assertEqual(tarinfo.pax_headers.get("VENDOR.umlauts"),
                             "\xc4\xd6\xdc\xe4\xf6\xfc\xdf")

tarinfo = tar.getmember("pax/regtype2")
            self.assertEqual(tarinfo.uname, "")
            self.assertEqual(tarinfo.gname, "bar")
            self.assertEqual(tarinfo.pax_headers.get("VENDOR.umlauts"),
                             "\xc4\xd6\xdc\xe4\xf6\xfc\xdf")

tarinfo = tar.getmember("pax/regtype3")
            self.assertEqual(tarinfo.uname, "tarfile")
            self.assertEqual(tarinfo.gname, "tarfile")
            self.assertEqual(tarinfo.pax_headers.get("VENDOR.umlauts"),
                             "\xc4\xd6\xdc\xe4\xf6\xfc\xdf")
        finally:
            tar.close()

def test_pax_number_fields(self):
        # All following number fields are read from the pax header.
        tar = tarfile.open(tarname, encoding="iso8859-1")
        try:
            tarinfo = tar.getmember("pax/regtype4")
            self.assertEqual(tarinfo.size, 7011)
            self.assertEqual(tarinfo.uid, 123)
            self.assertEqual(tarinfo.gid, 123)
            self.assertEqual(tarinfo.mtime, 1041808783.0)
            self.assertEqual(type(tarinfo.mtime), float)
            self.assertEqual(float(tarinfo.pax_headers["atime"]), 1041808783.0)
            self.assertEqual(float(tarinfo.pax_headers["ctime"]), 1041808783.0)
        finally:
            tar.close()

class WriteTestBase(TarTest):
    # Put all write tests in here that are supposed to be tested
    # in all possible mode combinations.

def test_fileobj_no_close(self):
        fobj = io.BytesIO()
        with tarfile.open(fileobj=fobj, mode=self.mode) as tar:
            tar.addfile(tarfile.TarInfo("foo"))
        self.assertFalse(fobj.closed, "external fileobjs must never closed")
        # Issue #20238: Incomplete gzip output with mode="w:gz"
        data = fobj.getvalue()
        del tar
        support.gc_collect()
        self.assertFalse(fobj.closed)
        self.assertEqual(data, fobj.getvalue())

def test_eof_marker(self):
        # Make sure an end of archive marker is written (two zero blocks).
        # tarfile insists on aligning archives to a 20 * 512 byte recordsize.
        # So, we create an archive that has exactly 10240 bytes without the
        # marker, and has 20480 bytes once the marker is written.
        with tarfile.open(tmpname, self.mode) as tar:
            t = tarfile.TarInfo("foo")
            t.size = tarfile.RECORDSIZE - tarfile.BLOCKSIZE
            tar.addfile(t, io.BytesIO(b"a" * t.size))

with self.open(tmpname, "rb") as fobj:
            self.assertEqual(len(fobj.read()), tarfile.RECORDSIZE * 2)

class WriteTest(WriteTestBase, unittest.TestCase):

prefix = "w:"

def test_100_char_name(self):
        # The name field in a tar header stores strings of at most 100 chars.
        # If a string is shorter than 100 chars it has to be padded with '\0',
        # which implies that a string of exactly 100 chars is stored without
        # a trailing '\0'.
        name = "0123456789" * 10
        tar = tarfile.open(tmpname, self.mode)
        try:
            t = tarfile.TarInfo(name)
            tar.addfile(t)
        finally:
            tar.close()

tar = tarfile.open(tmpname)
        try:
            self.assertEqual(tar.getnames()[0], name,
                    "failed to store 100 char filename")
        finally:
            tar.close()

def test_tar_size(self):
        # Test for bug #1013882.
        tar = tarfile.open(tmpname, self.mode)
        try:
            path = os.path.join(TEMPDIR, "file")
            with open(path, "wb") as fobj:
                fobj.write(b"aaa")
            tar.add(path)
        finally:
            tar.close()
        self.assertGreater(os.path.getsize(tmpname), 0,
                "tarfile is empty")

# The test_*_size tests test for bug #1167128.
    def test_file_size(self):
        tar = tarfile.open(tmpname, self.mode)
        try:
            path = os.path.join(TEMPDIR, "file")
            with open(path, "wb"):
                pass
            tarinfo = tar.gettarinfo(path)
            self.assertEqual(tarinfo.size, 0)

with open(path, "wb") as fobj:
                fobj.write(b"aaa")
            tarinfo = tar.gettarinfo(path)
            self.assertEqual(tarinfo.size, 3)
        finally:
            tar.close()

def test_directory_size(self):
        path = os.path.join(TEMPDIR, "directory")
        os.mkdir(path)
        try:
            tar = tarfile.open(tmpname, self.mode)
            try:
                tarinfo = tar.gettarinfo(path)
                self.assertEqual(tarinfo.size, 0)
            finally:
                tar.close()
        finally:
            os_helper.rmdir(path)

# mock the following:
    #  os.listdir: so we know that files are in the wrong order
    def test_ordered_recursion(self):
        path = os.path.join(TEMPDIR, "directory")
        os.mkdir(path)
        open(os.path.join(path, "1"), "a").close()
        open(os.path.join(path, "2"), "a").close()
        try:
            tar = tarfile.open(tmpname, self.mode)
            try:
                with unittest.mock.patch('os.listdir') as mock_listdir:
                    mock_listdir.return_value = ["2", "1"]
                    tar.add(path)
                paths = []
                for m in tar.getmembers():
                    paths.append(os.path.split(m.name)[-1])
                self.assertEqual(paths, ["directory", "1", "2"]);
            finally:
                tar.close()
        finally:
            os_helper.unlink(os.path.join(path, "1"))
            os_helper.unlink(os.path.join(path, "2"))
            os_helper.rmdir(path)

def test_gettarinfo_pathlike_name(self):
        with tarfile.open(tmpname, self.mode) as tar:
            path = pathlib.Path(TEMPDIR) / "file"
            with open(path, "wb") as fobj:
                fobj.write(b"aaa")
            tarinfo = tar.gettarinfo(path)
            tarinfo2 = tar.gettarinfo(os.fspath(path))
            self.assertIsInstance(tarinfo.name, str)
            self.assertEqual(tarinfo.name, tarinfo2.name)
            self.assertEqual(tarinfo.size, 3)

@unittest.skipUnless(hasattr(os, "link"),
                         "Missing hardlink implementation")
    def test_link_size(self):
        link = os.path.join(TEMPDIR, "link")
        target = os.path.join(TEMPDIR, "link_target")
        with open(target, "wb") as fobj:
            fobj.write(b"aaa")
        try:
            os.link(target, link)
        except PermissionError as e:
            self.skipTest('os.link(): %s' % e)
        try:
            tar = tarfile.open(tmpname, self.mode)
            try:
                # Record the link target in the inodes list.
                tar.gettarinfo(target)
                tarinfo = tar.gettarinfo(link)
                self.assertEqual(tarinfo.size, 0)
            finally:
                tar.close()
        finally:
            os_helper.unlink(target)
            os_helper.unlink(link)

@os_helper.skip_unless_symlink
    def test_symlink_size(self):
        path = os.path.join(TEMPDIR, "symlink")
        os.symlink("link_target", path)
        try:
            tar = tarfile.open(tmpname, self.mode)
            try:
                tarinfo = tar.gettarinfo(path)
                self.assertEqual(tarinfo.size, 0)
            finally:
                tar.close()
        finally:
            os_helper.unlink(path)

def test_add_self(self):
        # Test for #1257255.
        dstname = os.path.abspath(tmpname)
        tar = tarfile.open(tmpname, self.mode)
        try:
            self.assertEqual(tar.name, dstname,
                    "archive name must be absolute")
            tar.add(dstname)
            self.assertEqual(tar.getnames(), [],
                    "added the archive to itself")

with os_helper.change_cwd(TEMPDIR):
                tar.add(dstname)
            self.assertEqual(tar.getnames(), [],
                    "added the archive to itself")
        finally:
            tar.close()

def test_filter(self):
        tempdir = os.path.join(TEMPDIR, "filter")
        os.mkdir(tempdir)
        try:
            for name in ("foo", "bar", "baz"):
                name = os.path.join(tempdir, name)
                os_helper.create_empty_file(name)

def filter(tarinfo):
                if os.path.basename(tarinfo.name) == "bar":
                    return
                tarinfo.uid = 123
                tarinfo.uname = "foo"
                return tarinfo

tar = tarfile.open(tmpname, self.mode, encoding="iso8859-1")
            try:
                tar.add(tempdir, arcname="empty_dir", filter=filter)
            finally:
                tar.close()

# Verify that filter is a keyword-only argument
            with self.assertRaises(TypeError):
                tar.add(tempdir, "empty_dir", True, None, filter)

tar = tarfile.open(tmpname, "r")
            try:
                for tarinfo in tar:
                    self.assertEqual(tarinfo.uid, 123)
                    self.assertEqual(tarinfo.uname, "foo")
                self.assertEqual(len(tar.getmembers()), 3)
            finally:
                tar.close()
        finally:
            os_helper.rmtree(tempdir)

# Guarantee that stored pathnames are not modified. Don't
    # remove ./ or ../ or double slashes. Still make absolute
    # pathnames relative.
    # For details see bug #6054.
    def _test_pathname(self, path, cmp_path=None, dir=False):
        # Create a tarfile with an empty member named path
        # and compare the stored name with the original.
        foo = os.path.join(TEMPDIR, "foo")
        if not dir:
            os_helper.create_empty_file(foo)
        else:
            os.mkdir(foo)

tar = tarfile.open(tmpname, self.mode)
        try:
            tar.add(foo, arcname=path)
        finally:
            tar.close()

tar = tarfile.open(tmpname, "r")
        try:
            t = tar.next()
        finally:
            tar.close()

if not dir:
            os_helper.unlink(foo)
        else:
            os_helper.rmdir(foo)

self.assertEqual(t.name, cmp_path or path.replace(os.sep, "/"))

@os_helper.skip_unless_symlink
    def test_extractall_symlinks(self):
        # Test if extractall works properly when tarfile contains symlinks
        tempdir = os.path.join(TEMPDIR, "testsymlinks")
        temparchive = os.path.join(TEMPDIR, "testsymlinks.tar")
        os.mkdir(tempdir)
        try:
            source_file = os.path.join(tempdir,'source')
            target_file = os.path.join(tempdir,'symlink')
            with open(source_file,'w') as f:
                f.write('something\n')
            os.symlink(source_file, target_file)
            with tarfile.open(temparchive, 'w') as tar:
                tar.add(source_file, arcname="source")
                tar.add(target_file, arcname="symlink")
            # Let's extract it to the location which contains the symlink
            with tarfile.open(temparchive, errorlevel=2) as tar:
                # this should not raise OSError: [Errno 17] File exists
                try:
                    tar.extractall(path=tempdir,
                                   filter='fully_trusted')
                except OSError:
                    self.fail("extractall failed with symlinked files")
        finally:
            os_helper.unlink(temparchive)
            os_helper.rmtree(tempdir)

def test_pathnames(self):
        self._test_pathname("foo")
        self._test_pathname(os.path.join("foo", ".", "bar"))
        self._test_pathname(os.path.join("foo", "..", "bar"))
        self._test_pathname(os.path.join(".", "foo"))
        self._test_pathname(os.path.join(".", "foo", "."))
        self._test_pathname(os.path.join(".", "foo", ".", "bar"))
        self._test_pathname(os.path.join(".", "foo", "..", "bar"))
        self._test_pathname(os.path.join(".", "foo", "..", "bar"))
        self._test_pathname(os.path.join("..", "foo"))
        self._test_pathname(os.path.join("..", "foo", ".."))
        self._test_pathname(os.path.join("..", "foo", ".", "bar"))
        self._test_pathname(os.path.join("..", "foo", "..", "bar"))

self._test_pathname("foo" + os.sep + os.sep + "bar")
        self._test_pathname("foo" + os.sep + os.sep, "foo", dir=True)

def test_abs_pathnames(self):
        if sys.platform == "win32":
            self._test_pathname("C:\\foo", "foo")
        else:
            self._test_pathname("/foo", "foo")
            self._test_pathname("///foo", "foo")

def test_cwd(self):
        # Test adding the current working directory.
        with os_helper.change_cwd(TEMPDIR):
            tar = tarfile.open(tmpname, self.mode)
            try:
                tar.add(".")
            finally:
                tar.close()

tar = tarfile.open(tmpname, "r")
            try:
                for t in tar:
                    if t.name != ".":
                        self.assertTrue(t.name.startswith("./"), t.name)
            finally:
                tar.close()

def test_open_nonwritable_fileobj(self):
        for exctype in OSError, EOFError, RuntimeError:
            class BadFile(io.BytesIO):
                first = True
                def write(self, data):
                    if self.first:
                        self.first = False
                        raise exctype

f = BadFile()
            with self.assertRaises(exctype):
                tar = tarfile.open(tmpname, self.mode, fileobj=f,
                                   format=tarfile.PAX_FORMAT,
                                   pax_headers={'non': 'empty'})
            self.assertFalse(f.closed)

class GzipWriteTest(GzipTest, WriteTest):
    pass

class Bz2WriteTest(Bz2Test, WriteTest):
    pass

class LzmaWriteTest(LzmaTest, WriteTest):
    pass

class StreamWriteTest(WriteTestBase, unittest.TestCase):

prefix = "w|"
    decompressor = None

def test_stream_padding(self):
        # Test for bug #1543303.
        tar = tarfile.open(tmpname, self.mode)
        tar.close()
        if self.decompressor:
            dec = self.decompressor()
            with open(tmpname, "rb") as fobj:
                data = fobj.read()
            data = dec.decompress(data)
            self.assertFalse(dec.unused_data, "found trailing data")
        else:
            with self.open(tmpname) as fobj:
                data = fobj.read()
        self.assertEqual(data.count(b"\0"), tarfile.RECORDSIZE,
                        "incorrect zero padding")

@unittest.skipUnless(sys.platform != "win32" and hasattr(os, "umask"),
                         "Missing umask implementation")
    def test_file_mode(self):
        # Test for issue #8464: Create files with correct
        # permissions.
        if os.path.exists(tmpname):
            os_helper.unlink(tmpname)

original_umask = os.umask(0o022)
        try:
            tar = tarfile.open(tmpname, self.mode)
            tar.close()
            mode = os.stat(tmpname).st_mode & 0o777
            self.assertEqual(mode, 0o644, "wrong file permissions")
        finally:
            os.umask(original_umask)

class GzipStreamWriteTest(GzipTest, StreamWriteTest):
    def test_source_directory_not_leaked(self):
        """
        Ensure the source directory is not included in the tar header
        per bpo-41316.
        """
        tarfile.open(tmpname, self.mode).close()
        payload = pathlib.Path(tmpname).read_text(encoding='latin-1')
        assert os.path.dirname(tmpname) not in payload

class Bz2StreamWriteTest(Bz2Test, StreamWriteTest):
    decompressor = bz2.BZ2Decompressor if bz2 else None

class LzmaStreamWriteTest(LzmaTest, StreamWriteTest):
    decompressor = lzma.LZMADecompressor if lzma else None

class GNUWriteTest(unittest.TestCase):
    # This testcase checks for correct creation of GNU Longname
    # and Longlink extended headers (cp. bug #812325).

def _length(self, s):
        blocks = len(s) // 512 + 1
        return blocks * 512

def _calc_size(self, name, link=None):
        # Initial tar header
        count = 512

if len(name) > tarfile.LENGTH_NAME:
            # GNU longname extended header + longname
            count += 512
            count += self._length(name)
        if link is not None and len(link) > tarfile.LENGTH_LINK:
            # GNU longlink extended header + longlink
            count += 512
            count += self._length(link)
        return count

def _test(self, name, link=None):
        tarinfo = tarfile.TarInfo(name)
        if link:
            tarinfo.linkname = link
            tarinfo.type = tarfile.LNKTYPE

tar = tarfile.open(tmpname, "w")
        try:
            tar.format = tarfile.GNU_FORMAT
            tar.addfile(tarinfo)

v1 = self._calc_size(name, link)
            v2 = tar.offset
            self.assertEqual(v1, v2, "GNU longname/longlink creation failed")
        finally:
            tar.close()

tar = tarfile.open(tmpname)
        try:
            member = tar.next()
            self.assertIsNotNone(member,
                    "unable to read longname member")
            self.assertEqual(tarinfo.name, member.name,
                    "unable to read longname member")
            self.assertEqual(tarinfo.linkname, member.linkname,
                    "unable to read longname member")
        finally:
            tar.close()

def test_longname_1023(self):
        self._test(("longnam/" * 127) + "longnam")

def test_longname_1024(self):
        self._test(("longnam/" * 127) + "longname")

def test_longname_1025(self):
        self._test(("longnam/" * 127) + "longname_")

def test_longlink_1023(self):
        self._test("name", ("longlnk/" * 127) + "longlnk")

def test_longlink_1024(self):
        self._test("name", ("longlnk/" * 127) + "longlink")

def test_longlink_1025(self):
        self._test("name", ("longlnk/" * 127) + "longlink_")

def test_longnamelink_1023(self):
        self._test(("longnam/" * 127) + "longnam",
                   ("longlnk/" * 127) + "longlnk")

def test_longnamelink_1024(self):
        self._test(("longnam/" * 127) + "longname",
                   ("longlnk/" * 127) + "longlink")

def test_longnamelink_1025(self):
        self._test(("longnam/" * 127) + "longname_",
                   ("longlnk/" * 127) + "longlink_")

class DeviceHeaderTest(WriteTestBase, unittest.TestCase):

prefix = "w:"

def test_headers_written_only_for_device_files(self):
        # Regression test for bpo-18819.
        tempdir = os.path.join(TEMPDIR, "device_header_test")
        os.mkdir(tempdir)
        try:
            tar = tarfile.open(tmpname, self.mode)
            try:
                input_blk = tarfile.TarInfo(name="my_block_device")
                input_reg = tarfile.TarInfo(name="my_regular_file")
                input_blk.type = tarfile.BLKTYPE
                input_reg.type = tarfile.REGTYPE
                tar.addfile(input_blk)
                tar.addfile(input_reg)
            finally:
                tar.close()

# devmajor and devminor should be *interpreted* as 0 in both...
            tar = tarfile.open(tmpname, "r")
            try:
                output_blk = tar.getmember("my_block_device")
                output_reg = tar.getmember("my_regular_file")
            finally:
                tar.close()
            self.assertEqual(output_blk.devmajor, 0)
            self.assertEqual(output_blk.devminor, 0)
            self.assertEqual(output_reg.devmajor, 0)
            self.assertEqual(output_reg.devminor, 0)

# ...but the fields should not actually be set on regular files:
            with open(tmpname, "rb") as infile:
                buf = infile.read()
            buf_blk = buf[output_blk.offset:output_blk.offset_data]
            buf_reg = buf[output_reg.offset:output_reg.offset_data]
            # See `struct posixheader` in GNU docs for byte offsets:
            # <https://www.gnu.org/software/tar/manual/html_node/Standard.html>
            device_headers = slice(329, 329 + 16)
            self.assertEqual(buf_blk[device_headers], b"0000000\0" * 2)
            self.assertEqual(buf_reg[device_headers], b"\0" * 16)
        finally:
            os_helper.rmtree(tempdir)

class CreateTest(WriteTestBase, unittest.TestCase):

prefix = "x:"

file_path = os.path.join(TEMPDIR, "spameggs42")

def setUp(self):
        os_helper.unlink(tmpname)

@classmethod
    def setUpClass(cls):
        with open(cls.file_path, "wb") as fobj:
            fobj.write(b"aaa")

@classmethod
    def tearDownClass(cls):
        os_helper.unlink(cls.file_path)

def test_create(self):
        with tarfile.open(tmpname, self.mode) as tobj:
            tobj.add(self.file_path)