python setup.py egg_info works fine as well when run directly, so it now seems likely that wheel/pip is messing up my day by copying the directory and doing the build there:
+ /opt/python/cp35-cp35m/bin/pip wheel -w /io/python/wheelhouse .
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-req-build-lzcdu9b5/
python setup.py egg_info works fine as well when run directly, so it now seems likely that wheel/pip is messing up my day by copying the directory and doing the build there:
+ /opt/python/ cp35-cp35m/ bin/pip wheel -w /io/python/ wheelhouse .
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip- req-build- lzcdu9b5/