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Copy pathtest_tarfile.py
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2650 lines (2211 loc) · 96.6 KB
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import sys
import os
import io
from hashlib import md5
from contextlib import contextmanager
from random import Random
import pathlib
import unittest
import unittest.mock
import tarfile
from test import support
from test.support import script_helper
# Check for our compression modules.
try:
import gzip
except ImportError:
gzip = None
try:
import bz2
except ImportError:
bz2 = None
try:
import lzma
except ImportError:
lzma = None
def md5sum(data):
return md5(data).hexdigest()
TEMPDIR = os.path.abspath(support.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")
md5_regtype = "65f477c818ad9e15f7feab0c6d37742f"
md5_sparse = "a54fbc4ca4f4399a90e1b27164012fc6"
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(md5sum(data), md5_regtype,
"regular file extraction failed")
def test_fileobj_readlines(self):
self.tar.extract("ustar/regtype", TEMPDIR)
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)
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)
with open(os.path.join(TEMPDIR, "ustar/regtype"), "rb") as fobj:
data = fobj.read()
tarinfo = self.tar.getmember("ustar/regtype")
fobj = self.tar.extractfile(tarinfo)
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")
fobj.close()
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(md5sum(data), md5_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")
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_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).getrandbits(512*8).to_bytes(512, 'big')
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)
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.
tar = tar.open(self.tarname, mode="r:", fileobj=fobj)
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")
tar.close()
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")
@support.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)
self.addCleanup(support.unlink, os.path.join(TEMPDIR, "ustar/regtype"))
tar.extract("ustar/lnktype", TEMPDIR)
self.addCleanup(support.unlink, os.path.join(TEMPDIR, "ustar/lnktype"))
with open(os.path.join(TEMPDIR, "ustar/lnktype"), "rb") as f:
data = f.read()
self.assertEqual(md5sum(data), md5_regtype)
tar.extract("ustar/symtype", TEMPDIR)
self.addCleanup(support.unlink, os.path.join(TEMPDIR, "ustar/symtype"))
with open(os.path.join(TEMPDIR, "ustar/symtype"), "rb") as f:
data = f.read()
self.assertEqual(md5sum(data), md5_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)
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)
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()
support.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)
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:
support.rmtree(DIR)
def test_extractall_pathlike_name(self):
DIR = pathlib.Path(TEMPDIR) / "extractall"
with support.temp_dir(DIR), \
tarfile.open(tarname, encoding="iso8859-1") as tar:
directories = [t for t in tar if t.isdir()]
tar.extractall(DIR, directories)
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 support.temp_dir(DIR), \
tarfile.open(tarname, encoding="iso8859-1") as tar:
tarinfo = tar.getmember(dirtype)
tar.extract(tarinfo, path=DIR)
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:
support.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())
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(md5sum(data), md5_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 (900kB). If the file was
# compressed using another blocksize autodetection fails.
with open(tarname, "rb") as fobj:
data = fobj.read()
# Compress with blocksize 100kB, 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(md5sum(f.read()), chksum,
"wrong md5sum 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=md5_regtype)
def test_find_conttype(self):
tarinfo = self.tar.getmember("ustar/conttype")
self._test_member(tarinfo, size=7011, chksum=md5_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=md5_sparse)
def test_find_gnusparse(self):
tarinfo = self.tar.getmember("gnu/sparse")
self._test_member(tarinfo, size=86016, chksum=md5_sparse)
def test_find_gnusparse_00(self):
tarinfo = self.tar.getmember("gnu/sparse-0.0")
self._test_member(tarinfo, size=86016, chksum=md5_sparse)
def test_find_gnusparse_01(self):
tarinfo = self.tar.getmember("gnu/sparse-0.1")
self._test_member(tarinfo, size=86016, chksum=md5_sparse)
def test_find_gnusparse_10(self):
tarinfo = self.tar.getmember("gnu/sparse-1.0")
self._test_member(tarinfo, size=86016, chksum=md5_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=md5_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=md5_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=md5_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)
class GNUReadTest(LongnameTest, ReadTest, unittest.TestCase):
subdir = "gnu"
longnametype = tarfile.GNUTYPE_LONGNAME
# 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)
filename = os.path.join(TEMPDIR, name)
with open(filename, "rb") as fobj:
data = fobj.read()
self.assertEqual(md5sum(data), md5_sparse,
"wrong md5sum 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 in files.
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:
fobj.seek(4096)
fobj.truncate()
s = os.stat(name)
support.unlink(name)
return s.st_blocks == 0
else:
return False
class PaxReadTest(LongnameTest, ReadTest, unittest.TestCase):
subdir = "pax"
longnametype = tarfile.XHDTYPE