[Qemu-devel] Cryptic errors from PIP install if missing openssl-devel

[David Gibson <david@gibson.dropbear.id.au>]

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If I attempt to run "make check-acceptance" on my POWER9, RHEL8.1
machine when the openssl-devel package isn't installed, I get the
following very cryptic error:

  VENV    /home/dwg/qemu/build/rhel8/tests/venv
  PIP     /home/dwg/qemu/tests/requirements.txt
Command "/home/dwg/qemu/build/rhel8/tests/venv/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-la4el5r5/cryptography/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-1efs22iz-record/install-record.txt --single-version-externally-managed --compile --install-headers /home/dwg/qemu/build/rhel8/tests/venv/include/site/python3.6/cryptography" failed with error code 1 in /tmp/pip-build-la4el5r5/cryptography/

Using V=1 doesn't give any more useful information, and it's not
(easily) possible to manually re-run the given command since it relies
on things in /tmp that are removed once the attempt finishes.

I only figured out it was openssl-devel being missing that was the
problem by (mostly) guesswork.  It would be really great if we could
generate a more helpful error here.

In addition, if I rerun "make check-acceptance" it no longer even
attempts the PIP install, since tests/venv already exists in my build
environment.  It then sort of works, but I think it might be hitting
other errors because of the missing python packages.  Sorry that's a
bit vague - I also seem to be getting unrelated errors that I'm still
trying to figure out.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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