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os.remove on Windows could fail if files are still in use#554

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os.remove on Windows could fail if files are still in use #554

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11 changes: 10 additions & 1 deletion cuda_core/tests/conftest.py
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Expand Up@@ -57,10 +57,19 @@ def deinit_cuda():

@pytest.fixture(scope="session", autouse=True)
def clean_up_cffi_files():
yield
# Clean up files from previous runs before the session starts
files = glob.glob(os.path.join(os.getcwd(), "_cpu_obj*"))
Comment on lines 58 to 61

@jakirkhamjakirkhamApr 10, 2025

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Because of issues like the Windows cleanup issue, would highly recommend using pytest's builtin temporary directory management fixtures

This will handle all the directory creation and cleanup for us with less fuss

@rwgkrwgkApr 10, 2025

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+1 — if we have the free bandwidth

@jakirkhamjakirkhamApr 10, 2025

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Simpler, more reliable cleanup of the test directory will lead to bandwidth savings in the long term ;)

@leofangleofangMay 5, 2025

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I've explained this in a past group meeting, repeating here for wider visibility. pytest fixtures like tmp_path etc unfortunately do not work. The temp files are generated by CFFI inside a code sample (here), and we have no way to influence where it places the modules (without making the code sample overly complicated) I am afraid. I'd be happy to be proven wrong!

for f in files:
try: # noqa: SIM105
os.remove(f)
except FileNotFoundError:
pass # noqa: SIM105
except PermissionError:
# On Windows, removing a file in use raises PermissionError
# We can ignore this during setup, as the goal is just to
# clean up leftovers from *previous* runs. If a file is
# still in use now, it's likely from an ongoing process
# unrelated to the test session about to start.
pass
yield
# No cleanup needed after yield anymore

@rwgkrwgkApr 10, 2025

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That's a great move.

What do you think about adding something like this?

import logging
logger = logging.getLogger(__name__)
...
except PermissionError as e:
logger.warning(f"Could not remove file {f!r}: {e}")

That way, if a file is in use unexpectedly, we’ll at least have breadcrumbs.

We should probably also log the FileNotFoundError.