Open Stack

Hi,

For Windows related projects such as os-win and networking-hyperv,
we decided to keep the lower constraints job but remove indirect
dependencies from the lower-constraints.txt file.

This made it much easier to maintain and it allows us to at least cover
direct dependencies. I suggest considering this approach instead of
completely dropping the lower constraints job, whenever possible.
Another option might be to make it non-voting while it’s getting fixed.

Lucian Petrut

From: Jeremy Stanley<mailto:fungi at yuggoth.org>
Sent: Wednesday, January 20, 2021 1:52 AM
To: openstack-discuss at lists.openstack.org<mailto:openstack-discuss at lists.openstack.org>
Subject: Re: [all][tc] Dropping lower-constraints testing from all projects

On 2021-01-20 00:09:39 +0100 (+0100), Thomas Goirand wrote:
[...]
> Something I don't understand: why can't we use an older version of
> pip, if the problem is the newer pip resolver? Or can't the
> current pip be patched to fix things? It's not as if there was no
> prior art... Maybe I'm missing the big picture?
[...]

To get to the heart of the matter, when using older versions of pip
it was just quietly installing different versions of packages than
we asked it to, and versions of transitive dependencies which
directly conflicted with the versions other dependencies said they
required. When pip finally (very recently) implemented a coherent
dependency solver, it started alerting us directly to this fact. We
could certainly find a way to hide our heads in the sand and go back
to testing with old pip and pretending we knew what was being tested
there, but the question is whether what we were actually testing
that way was worthwhile enough to try to continue doing it, now that
we have proof it wasn't what we were wanting to test.

The challenge with actually testing what we wanted has always been
that there's many hundreds of packages we depend on and, short of
writing one ourselves, no tool available to find a coherent set of
versions of them which satisfy the collective lower bounds. The way
pip works, it wants to always solve for the newest possible
versions which satisfy an aggregate set of version ranges, and what
we'd want for lower bounds checking is the inverse of that.
--
Jeremy Stanley

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