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

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

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On Fri, Aug 30, 2019 at 02:56:48PM -0300, Eduardo Habkost wrote:
> On Thu, Aug 29, 2019 at 11:31:25AM +1000, David Gibson wrote:
> > 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.
> 
> V=1 is supposed to show the actual pip command being run.  I see
> it here:
> 
>   $ make check-venv V=1
>   [...]
>   python3 -B -m venv --system-site-packages /home/ehabkost/rh/proj/virt/qemu/tests/venv
> * /home/ehabkost/rh/proj/virt/qemu/tests/venv/bin/python -m pip -q install -r /home/ehabkost/rh/proj/virt/qemu/tests/requirements.txt
>   You are using pip version 19.0.3, however version 19.2.3 is available.
>   You should consider upgrading via the 'pip install --upgrade pip' command.
>   touch /home/ehabkost/rh/proj/virt/qemu/tests/venv
> 
> Can you reproduce the problem if you re-run the pip command?

Yes, I can, but it's basically just the same error without any extra
information.

> > 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.
> 
> I don't think there's much we can do about it, as the error is generated by a
> package being built by pip.
> 
> There's one thing we can do to make it slightly better: not passing `-q` to pip
> if running with V=1, so people can see which packages are being installed and
> which one is generating the error.

That sounds like a good start to me.

> > 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.
> 
> This sounds like a bug and we need to fix it.

I agree.

-- 
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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