Re: {__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=350...
>  
>  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