[yocto] Two pythons

[Michael Callahan]

Thanks Christopher and Ross.  I was afraid that might be the case.
When I find time I'll figure out how to crunch out one of the two
pythons the hard way.

On Fri, Oct 14, 2016 at 10:37 AM, Christopher Larson
<clarson at kergoth.com> wrote:
>
> On Fri, Oct 14, 2016 at 8:54 AM, Burton, Ross <ross.burton at intel.com> wrote:
>>
>> On 12 October 2016 at 18:58, Michael Callahan <coder.callahan at gmail.com>
>> wrote:
>>>
>>> I just moved my project from Fido to Krogoth and now I have two
>>> pythons (2.7 and 3).  This bumps the size of my image by approximately
>>> 25%.  What would be the most reasonable way to get back to just one
>>> python?  Ideally I'd like a magical setting to get rid of python3
>>> because there is no custom code for that one but I suppose with enough
>>> work I could get all of the python2 code working with python3.
>>
>>
>> Sadly you can't have a magic option to flip from one to the other as code
>> isn't compatible.  In general master has moved to be 99% Py3 - with smartpm
>> being the only major python2 recipe left - but I thought Krogoth was still
>> Py2 by default so shouldn't be in your image by default.
>>
>> I suggest you use the usual tools to find out why python2 and python3 are
>> in your images, and see what you can change to have just one.
>
>
> Yeah, as Ross says, the usual tools are best there. There are some things
> you can do to avoid the python dependency for certain recipes, but it has to
> be dealt with on a case by case basis, and of course depends on what your
> image is pulling in.
>
> For example,
> https://github.com/openembedded/openembedded-core/compare/master...kergoth:systemtap-python3
> splits out systemtap-dtrace into a separate recipe which is pulled in via
> RRECOMMENDS, so I can use BAD_RECOMMENDATIONS to exclude it for images that
> don’t need it (dtrace is the only thing in systemtap that needs python3).
> https://github.com/openembedded/meta-openembedded/compare/master...kergoth:lirc-python-3
> does the same for lirc.
> --
> Christopher Larson
> clarson at kergoth dot com
> Founder - BitBake, OpenEmbedded, OpenZaurus
> Maintainer - Tslib
> Senior Software Engineer, Mentor Graphics