tarfile seems to incorrectly handle filenames longer
than 100 characters. This is tarfile as provided with
2.4.3 and 2.4.4. The 0.8.0 version of tarfile is even
worse - it will cut off the last character of any
filename that is exactly 100 in size.

Below the unit test that I use to reproduce the problem:

class Test00tarfile(unittest.TestCase):
    def runtest(self, longName):
        import tarfile
        dst=StringIO()
        src=StringIO("Hello world!")
        srclen = len("Hello world!")
        tar = tarfile.open(mode='w|', fileobj=dst)
        tar.add('test.py')
        info = tar.gettarinfo('test.py', longName)
        info.size = srclen
        tar.addfile(info, src)
        src.seek(0)
        tar.addfile(info, src)
        tar.close()
        dst.seek(0)
        tar = tarfile.open(mode='r|', fileobj=dst)
        info = tar.next()
        self.assertEqual(info.name, 'test.py')
        info = tar.next()
        self.assertEqual(info.size, srclen)
        self.assertEqual(info.name, longName)
        info = tar.next()
        self.assertEqual(info.name, longName)
        info = tar.next()
        self.assertEqual(None, info)
    def testLongFileName200(self):
        "tarfile with 200+ length filename"
        self.runtest("LongName/" + 200 * "x" + "/LongTail")
    def testLongFileName100(self):
        "tarfile with 100 length filename"
       
self.runtest('MyWiki/underlay/pages/(e7ae80e4bd93e4b8ade69687)MoinMoin(2fe5ae89e8a385e6898be5868c)/cache/text_html')


The "200" test fails on the standard version, on
tarfile 0.8.0 the 100 test fails too.

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user_id=1372511

Test was wrong, and there were distinct bugs in various
versions.