Re: [gentoo-python] Python 3 in Gentoo

[Matthew Summers]

On Mon, Jul 30, 2012 at 10:56 AM, Mike Gilbert <floppym@g.o> wrote:
> On Mon, Jul 30, 2012 at 11:40 AM, Dirkjan Ochtman <djc@g.o> wrote:
>> On Mon, Jul 30, 2012 at 5:30 PM, Mike Gilbert <floppym@g.o> wrote:
>>>> I guess I still think it should be possible to give Portage a hint not
>>>> to install a new SLOT if the old SLOT is okay.
>>>
>>> In this case, I think we would need something more subtle than that;
>>> most users would want a hypothetical python-2.8 to be installed, and
>>> python-3 users will certainly want to be upgraded to python-3.3 when
>>> that lands.
>>>
>>> In other words, if we tell portage not to upgrade to a new slot
>>> automatically, that means users would have to manually install each
>>> major release of python.
>>
>> No, I was going for the kind of effect where being inclusive wrt the
>> new major Python version would be controlled in a single place. I.e.
>> in the ebuild or in an eclass or some such.
>>
>> So you'd have SLOT="~3" in the python-3* ebuilds, and Portage would
>> know to not install SLOT=3 unless requested explicitly, and at some
>> point we'd remove the '~'.
>
> Where else in the tree could this concept be applied?
>
> I would prefer to avoid going through the EAPI process if it is just
> going to be used for python. And even then, I'm not really excited
> about the prospect of explaining it.
>
> Also, I'm sure that people will whine about the "upgrade path" being
> broken if we set EAPI=5 or 6 in the python ebuilds any time this
> decade.
>
> A solution that works within the confines of the current EAPI spec
> should be greatly preferred.
>

Could we not just set a dep as =dev-lang/python:2 so that any version
of python-2.* would satisfy the dep? Or, would this cause issues in
avoiding old versions of python (python-2.5)? It might be enough to
change the portage ebuild to work as it does now for the USE python2
and python3, but in the case where those flags are not set, then just
pull in python:2 which would yield the latest stable version of
python-2.*

I think adding something to EAPI is going to take too long and/or not
work well for folks.

For python-updater, I might be inclined to add similar USE to portage
to manage the deps.

-- 
Matthew W. Summers
Gentoo Foundation Inc.