On 3/25/19 10:18 AM, Stephen John Smoogen wrote:
> On Mon, 25 Mar 2019 at 13:07, Miro Hrončok <mhron...@redhat.com> wrote:
>> On 13. 03. 19 15:30, Stephen John Smoogen wrote:
>>> Over the last 5 days, Troy Dawson, Jeroen van Meeuwen, Carl W George,
>>> and several helpers have gotten nearly all of the python34 packages
>>> moves over to python36 in EPEL-7.  They are being included in 6 Bodhi
>>> pushes because of a limitation in Bodhi for the text size of packages
>>> in an include.
>>> The current day for these package groups to move into EPEL regular is
>>> April 2nd. We would like to have all tests we find in the next week or
>>> so also added so that the updates can occur in a large group without
>>> too much breakage.
>> A problem was pointed out in
>> https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2019-f2d195dada#comment-914787
>> If you have 3rd party software using /usr/bin/python3 and you have python34
>> installed, updating your system will remove that symlink and your software 
>> breaks.
>> However we cannot obsolete python34 form python36, because that breaks 
>> software
>> that actually wants and uses /usr/bin/python3.4 and possibly make python34
>> uninstallable (not sure).
>> So arguably, the update should update both python34 and install python36,
>> keeping both Pythons available, the user/admin could than remove the one 
>> that is
>> not needed.
>> AFAIK The only thing that would make this happen is to require python36 from
>> python34. And that seems like a huge ugly workaround with unwanted side 
>> affects.
> Here is a hair-brained idea. have them both require
> python3-versioned-command which puts in the alternatives logic and
> sets it to 1 of 3 options?
> 1. python34
> 2. python36
> 3. you didn't install a python silly

I think that could be confusing (not that the alternatives are much
else. ;)

But we talked about this a lot on IRC.

Just make python36 obsolete the old version of python34 that had
/usr/bin/python3. This causes yum to install the new python34 and pull
in python36 for /usr/bin/python3.

It does mean people with 3rd party software are now using python36
instead of 34, but if they only speficied /usr/bin/python3, it should
just run with any python3 version right?


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