[Distutils] local platform tags and pip wheel caching

[Daniel Holth]

Makes sense to me. Could be an environment variable or bdist_wheel option
or both.

On Tue, Jun 9, 2015 at 3:10 PM Robert Collins <robertc at robertcollins.net>
wrote:

> So the pip wheel caching feature has promoted a few latent problems
> into the limelight.
>
> One is that many wheels projects built are not actually as compatible
> as thought.  https://github.com/pypa/pip/issues/2882
> One is that wheels don't support writing datafiles outside their
> environment. https://github.com/pypa/pip/issues/2874
> And the one I want to talk about is that we don't generate
> sufficiently good platform markers on Linux.
> https://github.com/pypa/pip/issues/2875
>
> That bug describes the scenario of using a wheel cache shared across
> multiple Linux ABIs - e.g. LXC containers with a bind mounted home
> dir, or NFS on a cluster. pip 7's implicit wheel cache triggers this
> situation for people.
>
> The OP has suggested that being able to control the platform tag that
> pip a) looks for and b) instructs wheel to use would let them avoid
> issues in this situation without having to solve the general problem
> of 'the universe of Linuxs can't agree on anything'.
>
> e.g, in each context they could set a /etc/pip.conf containing
> [global]
> wheel_platform = contextname
>
> and then pip would use that and instruct built wheels to use that.
>
> Further, they not that it can be used to e.g. describe other local
> policies like 'I want hardened C builds' that are not inferrable from
> context at all today.
>
> But since this affects pip *and* wheel, we're bringing it here for
> discussion.
>
> I'm in favour of it - it fits the existing wheel spec; its opt-in,
> non-intrusive and solves a real, present problem. [just not the 'how
> do we get these damn things into PyPI, yet].
>
> -Rob
>
> --
> Robert Collins <rbtcollins at hp.com>
> Distinguished Technologist
> HP Converged Cloud
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