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bpo-29435: Allow is_tarfile to take a filelike obj (GH-18090)

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`is_tarfile()` now supports `name` being a file or file-like object.
This commit is contained in:
William Woodruff 2020-01-22 21:24:16 -05:00 • committed by Ethan Furman
parent 41f0ef6abb
commit dd754caf14
5 changed files with 45 additions and 2 deletions
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32
Lib/test/test_tarfile.py
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@ -319,6 +319,38 @@ class LzmaListTest(LzmaTest, ListTest):
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