{__python2} for el6?

[Toshio Kuratomi]

On Wed, Dec 04, 2013 at 02:41:30PM -0500, Ralph Bean wrote:
> Back in August, the {__python} macro was deprecated in favor of
> {__python2}.  This is cool as it paves the way for an eventual python3
> takeover.
> 
> https://fedoraproject.org/w/index.php?title=Packaging:Python&diff=350838&oldid=350837
> 
> However, {__python} is still the expected macro for el6 builds.  Many of us
> maintain single spec files that we build for Fedora and EPEL.
> 
> - Does anyone have any recommendations about how to handle this?
> 
Someone should take a look at the present guidelines but I think just using
/usr/bin/python2 (or python2 and letting PATH do the rest) is probably okay.

>   I recently started using this blurb at the top of my new spec files.
>   Will it do?
> 
>     %if 0%{?rhel} && 0%{?rhel} <= 6
>     %{!?__python2:        %global __python2 %{__python}}
>     %{!?python2_sitelib:  %global python2_sitelib %(%{__python} -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())")}
>     %{!?python2_sitearch: %global python2_sitearch %(%{__python} -c "from distutils.sysconfig import get_python_lib; print(get_python_lib(1))")}
>     %endif
> 

it's probably more correct to do this this way:

    %if 0%{?rhel} && 0%{?rhel} <= 6
    %{!?__python2:        %global __python2 /usr/bin/python2}
    %{!?python2_sitelib:  %global python2_sitelib %(%{__python2} -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())")}
    %{!?python2_sitearch: %global python2_sitearch %(%{__python2} -c "from distutils.sysconfig import get_python_lib; print(get_python_lib(1))")}
    %endif



> - If we decide on a canonical approach, can it be added to the Python
>   guidelines as a recommendation?
> 
Yeah, but please draft it up.  I'm low on time so even completing writing of
the changes for this approved guideline change hasn't been something I've
gotten too:
https://fedorahosted.org/fpc/ticket/327#comment:9

-Toshio
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