python-django update to Django-1.6

[Stephen Gallagher]

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On 11/26/2013 09:31 AM, Simo Sorce wrote:
> On Tue, 2013-11-26 at 08:59 -0500, Stephen Gallagher wrote:
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>> 
>> On 11/26/2013 08:34 AM, Simo Sorce wrote:
>>> On Tue, 2013-11-26 at 12:02 +0100, Matthias Runge wrote:
>>>> On 11/25/2013 06:51 PM, Simo Sorce wrote:
>>>>> On Mon, 2013-11-25 at 11:24 -0500, Stephen Gallagher
>>>>> wrote:
>>>> 
>>>>>>> 
>>>>>> 
>>>>>> This is kind of why I keep coming back to: "Why do we
>>>>>> have python-django at all?" I don't really see any reason
>>>>>> why we shouldn't kill off the python-django package and
>>>>>> just carry 'python-django15' and 'python-django16'
>>>>>> packages with a conflict.
>>>>>> 
>>>>>> The number of incompatibilities between releases is such
>>>>>> that I don't think we really want to be forcing upgrades
>>>>>> on other packages at all. We should just be carrying
>>>>>> whichever two versions are supported by upstream at any
>>>>>> given time. Upstream is very good about maintaining
>>>>>> bugfixes and security fixes in both supported streams.
>>>>> 
>>>>> +1 by changing version the current way, the only ting we
>>>>> can guarantee is a lot of broken packages all the time.
>>>>> 
>>>> I see your points here and thank you for the feedback!
>>>> 
>>>> From my experience, it was just a pain to have
>>>> python-django14 and python-django[1]. Introducing one or two
>>>> other packages python-django15 and python-django16 will make
>>>> it more difficult for users to update django. How should
>>>> packages require Django? Just require python-django? Sadly,
>>>> yum can not handle that properly[1].
>>>> 
>>>> When dropping python-django as provides/requires, we'd have
>>>> the situation packages will require a specific version.
>>>> That's rather unfortunate, because combination of packages
>>>> requiring some other python-django-foo package might require
>>>> a different django version.
>>>> 
>>>> At least for OpenStack Horizon I can say, we're up to fix 
>>>> compatibility issues with Django-1.6 upstream.
>>>> 
>>>> Matthias
>>>> 
>>>> 
>>>> [1] https://bugzilla.redhat.com/show_bug.cgi?id=978647
>>> 
>>> Packages should require the latest version they work with. If
>>> some package is really awesome and supports multiple versions I
>>> guess it could support a generic python-django.
>>> 
>>> It's ok if 2 packages become incompatible this way, they
>>> wouldn't work anyway with the wrong version of django.
>> 
>> 
>> I think Simo has the right idea here. We should drop the
>> standard "python-django" package at this point and instead have
>> python-django15 and python-django16. Each of those packages
>> should add a virtual Provides: and Obsoletes: for python-django.
>> 
>> Existing packages with a non-strict version will then default to 
>> upgrading to the absolute latest version (python-django16). If
>> that's not acceptable to their project, they'll need to release a
>> new update with 'Requires: python-django15' and things should go
>> back to normal. In the future, if they update so they work with
>> both currently-available versions, they can go back to
>> 'Requires: python-django' and will then work with whichever
>> version the user has on the system (such as for another
>> project).
>> 
>> Yes, it slightly increases the packager work, but it should give
>> a better experience for the user... to a point.
>> 
>> Since Django 1.5 and 1.6 cannot presently co-exist on the
>> system, they'll need to have an explicit Conflicts:. This does
>> mean that users will have an issue if they end up pulling Django
>> 1.6 as part of an upgrade and then try to install a package that
>> Requires: python-django15. We can't automatically remove
>> python-django16, so the user will have to know to do this
>> manually.
> 
> One issue to resolve is how to upgrade to the next version if you
> have python-django15 and F22 has python-django16 and
> python-django17, perhaps some clever way of making python-django16
> obsolete (instead of conflict) python-django15 once 1.5 is pushed
> out of the new distro version ?

Obsoletes: wouldn't really be appropriate here, because that implies
that it's a complete replacement of the old version. That said, it
still might be the best of a bad situation...

I still think that the safest approach is to require that packagers of
Django apps keep their dependencies set appropriately.

So if they know they support 1.5 and 1.6:

Requires: python-django >= 1.5
Conflicts: python-django >= 1.7

And if they only support one, they should
Requires: python-django15
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