Re: Package-split upgrade path

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Sandro Mani wrote:

> 
> On 25.04.2013 18:43, Rex Dieter wrote:
>> Sandro Mani wrote:
>>
>>> On 19.04.2013 17:58, Rex Dieter wrote:
>>>> Sandro Mani wrote:
>>>>
>>>>> Hello,
>>>>>
>>>>> In python-pillow (the python imaging fork which replaced PIL in F19+),
>>>>> there is a module (ImageQt) which requires PyQt4, but that dependency
>>>>> is missing in python-pillow (and in python-imaging before). I don't
>>>>> really like adding PyQt4 as a dependency to the main package, since it
>>>>> pulls in lots of stuff. So, I'd go for creating a python-pillow-qt
>>>>> subpackage (albeit with just one file), and now am wondering about the
>>>>> upgrade path. From what I can see, there is just one package which
>>>>> uses the ImageQt module (pony, which actually looks to be rather
>>>>> unmaintained). Question: What is the best way to proceed?
>>>> make python-pillow-qt include
>>>>
>>>> Obsoletes: python-pillow <  #last_EVR_before_qt_subpkg_existed#
>>>> Requires: python-pillow = %{version}-%{release}
>>>>
>>> Thanks
>> Upon further reflection...  Turns out in this case that was not entirely
>> good advice.  I'd erroneously assumed there was qt support in the package
>> prior to this.
>>
>> Since that PyQt4 support is new, what ends up happening is that users
>> with the older python-pillow installed, will now get python-pillow *and*
>> python- pillow-qt (and PyQt4 stack along with it).
>>
>> Unless, that is what you want by design?

> So, the problem is that the pony package uses the ImageQt module, so I
> recon the chosen approach is the only way that does not break pony until
> pony requires python-pillow-qt? I opened a bug for that [1], but so far
> there has been no activity. But I'm certainly happy if there was a
> cleaner way to proceed.

> [1] https://bugzilla.redhat.com/show_bug.cgi?id=953967

How about I flex some provenpackager muscle to fix [1] asap.  Then you can 
drop the Obsoletes 

-- rex

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