Running pytest within pytest fails with pytest==8.0.0rc1

[mwouts]

Thanks for maintaining and developing pytest. This is such an amazing tool!

I have setup a --pre version of the CI on one of the projects that I maintain, and it happens that one test fails with the release candidate pytest==8.0.0rc1.

Here are the logs of the action: https://github.com/mwouts/jupytext/actions/runs/7487800603/job/20381150371

The failing test does the following:

• It creates a temporary .py file from a Markdown document
• And then it calls pytest on that .py file, so in the end it's calling pytest /tmp/notebook_lx_y64ur.py.

With pytest==8.0.0rc1, the test fails with the following error:

E   PermissionError: [Errno 13] Permission denied: '/tmp/snap-private-tmp/__init__.py'

I am not sure how to extract a simpler minimal example from this, but I can look into this if you think that would help. Thanks!

[RonnyPfannschmidt]

duplicate of #11781

[bluetech]

Yes, as written in the other issue, you should avoid running things from /tmp; the way pytest works requires looking inside & running things from the directory (like conftest.py, __init__.py) and since /tmp is world-writable you really don't want that. It's better to put the file inside tmp_path or even just in a tempfile.TemporaryDirectory, but not directly in /tmp.

[mwouts]

Yes, as written in the other issue, you should avoid running things from /tmp; the way pytest works requires looking inside & running things from the directory (like conftest.py, __init__.py) and since /tmp is world-writable you really don't want that. It's better to put the file inside tmp_path or even just in a tempfile.TemporaryDirectory, but not directly in /tmp.

Oh thanks for pointing this out! Sure I should be able to use tempfile.TemporaryDirectory, that's a great suggestion!