Re: [gentoo-python] New eclass for Python

[Krzysztof Pawlik <nelchael@gentoo.org>]

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On 14/05/12 19:42, Nikolaj Sjujskij wrote:
> Den 2012-05-14 20:12:51 skrev Krzysztof Pawlik <nelchael@gentoo.org>:
> 
>> On 13/05/12 21:57, Dirkjan Ochtman wrote:
>>> On Sat, May 12, 2012 at 10:32 PM, Mike Gilbert <floppym@gentoo.org> wrote:
>>>> Why not emulate php/ruby and set a default value in the base profile?
>>>> See profiles/base/make.defaults.
>>>>
>>>> I think PYTHON_TARGETS="python2_7 python3_2" would be a reasonable choice.
>>>
>>> Yeah, I think we should provide a default value, and this default
>>> value looks good to me.
>>
>> Feel free to do so :) I would disagree with adding py3 to default, but it's
>> only me.
>  It would be pretty strange if we had had Py3k as default Python (i.e. in
> stage3) and PYTHON_TARGETS for another version altogether.

I don't have Py3 installed at all on all my machines.

> And how would new eclass behave in such case? Just-out-of-stage3 system would
> have only Python 3.2 installed, but PYTHON_TARGETS="python2_7 python3_2". Let's
> say user tries to:
>  # emerge -av pygments
> Of course, assuming dev-python/pygments had been ported to new eclass. Would
> python-distutils-ng handle this correctly and transparently? Without obscure
> errors like "You wants Python 2.7 but haz no Python 2.7"? Without pulling
> dev-lang/python:2.7 in? If not, I call this serious usability regression.

It seems you have no clue how this eclass works. If you have only py3 installed,
and you set PYTHON_TARGETS="python2_7" then dev-lang/python:2.7 will be added to
DEPEND and installed.

The user asked to install for py2:7 so he will get this done. It's not a
usability regression - it's expected behaviour: user wants to build for FOO:X.Y
then the eclass adds FOO:X.Y to DEPEND.

I fail to see how would you like to "correctly and transparently" (whatever it
means to you) do it. If you don't accept as a solution an error message or
pulling in py2:7 then there's no other way - you either install missing
dependencies or die with an error, no third way.

-- 
Krzysztof Pawlik  <nelchael at gentoo.org>  key id: 0xF6A80E46
desktop-misc, java, vim, kernel, python, apache...


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