Re: [gentoo-python] Problem with packages losing python2 compatibility

[Ian Stakenvicius <axs@gentoo.org>]

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On 2018-12-10 11:07 a.m., Michał Górny wrote:
> What can we do to solve it?
> ===========================
> 
> a) Do nothing and hope upstreams solve it at some point.  I don't think
> this is acceptable because Portage's slowdown is going to be
> significant.
> 
> b) Start dropping py2 from packages.  Sadly, this is hard because we're
> talking about huge reverse dependency graph, and I'm pretty sure some of
> our users need those packages w/ py2 support.
> 
> c) Slot IPython?  That's probably the least intrusive option, though
> ugly as hell, and I'm not sure if it's not going to impact dep
> calculation severely anyway.  We'd have a :5 slot that supports py2
> only, and :0 slot that supports py3 only.  Dependencies will be tricky,
> life's going to be hard but maybe things will work.
> 
> Any other options?

This'll be uglier for maintainers but cleaner for the repo -- what
about a single IPython "package" that installs :5 for py2 and :0 for
py3 ? Since python multi-builds anyways it shouldn't be too difficult
to have it install from separate distfiles.  Versioning would be a
royal pain, likely some sort of combination of versions into a
snapshot version number of sorts would need to be done...



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