Handle SIGPIPE/BrokenPipeError in pytest's CLI #7185
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nicoddemus
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May 7, 2020
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Thanks @bluetech!
Besides my comments we should also add a CHANGELOG entry. Is this a bug fix or an improvement btw? 🤔
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It's a improvement |
Running `pytest | head -1` and similar causes an annoying error to be
printed to stderr:
Exception ignored in: <_io.TextIOWrapper name='<stdout>' mode='w' encoding='utf-8'>
BrokenPipeError: [Errno 32] Broken pipe
(or possibly even a propagating exception in older/other Python versions).
The standard UNIX behavior is to handle the EPIPE silently. To
recommended method to do this in Python is described here:
https://docs.python.org/3/library/signal.html#note-on-sigpipe
It is not appropriate to apply this recommendation to `pytest.main()`,
which is used programmatically for in-process runs. Hence, change
pytest's entrypoint to a new `pytest.console_main()` function, to be
used exclusively by pytest's CLI, and add the SIGPIPE code there.
Fixes pytest-dev#4375.
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I'm not sure why the |
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Running
pytest | head -1and similar causes an annoying error to beprinted to stderr:
(or possibly even a propagating exception in older/other Python versions).
The standard UNIX behavior is to handle the SIGPIPE silently. To
recommended method to do this in Python is described here:
https://docs.python.org/3/library/signal.html#note-on-sigpipe
It is not appropriate to apply this recommendation to
pytest.main(),which is used programmatically for in-process runs. Hence, change
pytest's entrypoint to a new
pytest.console_main()function, to beused exclusively by pytest's CLI, and add the SIGPIPE code there.
Fixes #4375.