Commits on Dec 6, 2020

1. util: also run chmod on EPERM …

   Writing a test for this one is tricky, because I was seeing the issue
   only when the directory being removed is a docker volume, so instead of
   getting EACCES we get EPERM.
   
   This is easy to reproduce though. The existing test fails when the
   directory being used for the files is a docker volume:
   
   ```
   % docker run \
   	-v $(mktemp -d):/tmp \
   	-v ${PWD}:/src \
   	-w /src \
   	python:3 \
   	bash -c 'pip install -e . && pip install -r requirements-dev.txt && python -m pytest tests/util_test.py'
   ```

   

   fsouza committed Dec 6, 2020
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2. util: use set instead of tuple in errno check …

   Co-authored-by: Paul Fischer <70564747+paulhfischer@users.noreply.github.com>

   

   fsouza and paulhfischer committed Dec 6, 2020
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