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   <H1>[Mageia-dev] Python Packaging Policy</H1>
    <B>Michael scherer</B> 
    <A HREF="mailto:mageia-dev%40mageia.org?Subject=Re%3A%20%5BMageia-dev%5D%20Python%20Packaging%20Policy&In-Reply-To=%3C20110119072523.GA2739%40sisay.ephaone.org%3E"
       TITLE="[Mageia-dev] Python Packaging Policy">misc at zarb.org
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    <I>Wed Jan 19 08:25:23 CET 2011</I>
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<PRE>On Wed, Jan 19, 2011 at 02:07:18AM +0100, Antoine Pitrou wrote:
&gt;<i> On Wed, 19 Jan 2011 00:55:40 +0100
</I>&gt;<i> Michael scherer &lt;<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">misc at zarb.org</A>&gt; wrote:
</I>&gt;<i> &gt; 
</I>&gt;<i> &gt; &gt; The solution of generating bytecode at install time looks fine. I am
</I>&gt;<i> &gt; &gt; not an RPM specialist though, but if you have non-RPM specific questions
</I>&gt;<i> &gt; &gt; feel free to ask them, I'd be glad to answer.
</I>&gt;<i> &gt; 
</I>&gt;<i> &gt; Well, that's not satisfying from a rpm pov, unfortunately. 
</I>&gt;<i> 
</I>&gt;<i> Can you explain why it isn't? I'm sure other packages generate stuff at
</I>&gt;<i> install-time, right? Also, the list of files is well-known (it's
</I>&gt;<i> everything named &quot;*.py&quot; that goes somewhere inside /usr/lib/pythonXXX/).
</I>
Because that would 1) requires a patch to rpm that we do not have or
2) patch all python packages to had %ghost on all *.pyc,  and do a compilation of
*pyc ( the 2nd part is easy, the first one is slightly harder to automate ) 
3) do not care about file tracking, but that's unclean.

Do not get me wrong, I think that's the way forward, but that's not applicable 
in a few days.

And I cannot think of a rpm generating stuff at install time that do not requires
specific intervention in the spec. Usually, we have packages that register themself
in a dynamic list ( man, info, .desktop ), or that trigger symlink 
( updates-alternatives ) , and those symlink are not tracked by rpm, and that's a 
suboptimal solution ( ie, you cannot do a research by file name, etc )

&gt;<i> &gt; &gt; What is the issue with &quot;handling 2to3&quot;? It's a developer tool and
</I>&gt;<i> &gt; &gt; certainly shouldn't be invoked at install time if that's what you are
</I>&gt;<i> &gt; &gt; asking. Generally, I don't think you (as a packager) have to invoke
</I>&gt;<i> &gt; &gt; 2to3 manually at all. If 2to3 is part of the packaged software's build
</I>&gt;<i> &gt; &gt; process, then their setup.py will probably invoke it automatically with
</I>&gt;<i> &gt; &gt; the right options.
</I>&gt;<i> &gt; 
</I>&gt;<i> &gt; I as more speaking of the transition from pyton 2 to python 3. I think the easiest
</I>&gt;<i> &gt; on a policy point of view is to handle this like 2 separate languages, but that mean twice the work.
</I>&gt;<i> &gt; And so we should at least try to  do better ( not sure that we can, of course ).
</I>&gt;<i> 
</I>&gt;<i> Handling them as two separate languages looks indeed like the right
</I>&gt;<i> thing to do, IMO. In any case, as I said, you shouldn't be the one
</I>&gt;<i> wondering about 2to3. Upstream developers do, if that's the conversion
</I>&gt;<i> method they chose for their project.
</I>
Well, I was not clear, when i said &quot;2to3&quot;, i didn't mean't the tools at all. 
Rather the fact we have to handle the migration, my sentences was poorly worded.

&gt;<i> I'm not sure about &quot;twice the work&quot;: you don't need to track twice the
</I>&gt;<i> software releases (except for the interpreter itself), or twice the
</I>&gt;<i> upstream patches, etc.
</I>
Well, if we handle this like 2 separates languages, that mean 2 separates rpms for
each modules. Or we should be clever when generating 1 rpm to have the modules
for both python 3 and python 2 generated ( Except when the developper did choose
to have separate tarball or code base )
Having one rpm that produces 2 modules also mean that we will rebuild all modules
for python3 and all for python2, and I know that for example Buchan will not like
the extranous trafic it would generate.

So IMHO, there is various things to discuss.
-- 
Michael Scherer
</PRE>


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