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Fix crash when passing a very long cmdline argument #11404

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merged 2 commits into from Sep 7, 2023

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nicoddemus
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Fixes #11394

@@ -262,3 +262,27 @@ def test(fix):
"* 1 passed in *",
]
)


def test_very_long_cmdline_arg(pytester: Pytester) -> None:
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@nicoddemus nicoddemus Sep 7, 2023

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@iandonnelly I'm having trouble reproducing the original problem, this test is passing on all platforms.

Any hints?

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its possibly related to available file-systems/path types (i believe the github runners always use unc/long paths)

would it break when using a path thats not supported on all platforms (i believe >64k)

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@nicoddemus nicoddemus Sep 7, 2023

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Hmm thanks for the hint, trying now with a very large path (>100k), let's see.

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@nicoddemus nicoddemus Sep 7, 2023

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Btw anybody on linux can test this please?

>>> import errno
>>> errno.ENAMETOOLONG
38

The above is on Windows; on the original report, the errno was 36 on Linux, want to confirm that's ENAMETOOLONG is indeed 36.

EDIT: nevermind, just confirmed it is indeed 36 on Linux.

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@nicoddemus nicoddemus Sep 7, 2023

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Hmm no good using >100k filenames, the test still passes.

I guess we can rely on patching then to ensure the behavior...

@nicoddemus nicoddemus marked this pull request as ready for review September 7, 2023 13:52
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Ready for review -- any suggestions on how to improve the approach taken here are appreciated.

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@RonnyPfannschmidt RonnyPfannschmidt left a comment

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this one is a special kind of icky 😮‍💨

@nicoddemus nicoddemus merged commit 28ccf47 into pytest-dev:main Sep 7, 2023
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@nicoddemus nicoddemus deleted the 11394-long-cmdline branch September 7, 2023 15:49
nicoddemus added a commit to nicoddemus/pytest that referenced this pull request Sep 7, 2023
nicoddemus added a commit that referenced this pull request Sep 7, 2023
[7.4.x] Fix crash when passing a very long cmdline argument (#11404)
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Pytest Fails to Run When Passing Long Command Line Arguments
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