Re: Patch: allow the 'python' used to run gentpl.py to be configured

[Adam Williamson <awilliam@redhat.com>]

On Fri, 2018-07-06 at 19:25 +0200, Daniel Kiper wrote:
> On Wed, Jul 04, 2018 at 10:08:53AM -0700, Adam Williamson wrote:
> > gentpl.py is python2/3-agnostic, but there's no way to cause it
> > to be run with any interpreter other than 'python', it's just
> > hard-coded into Makefile.common that way. Adjust that to allow
> > a make variable PYTHONBIN to be set to the desired interpreter.
> > This will make it easier in situations where we specifically
> > want to build with 'python2' or 'python3' or whatever.
> > 
> > Signed-off-by: Adam Williamson <awilliam@redhat.com>
> 
> Thanks for the patch. However, I think that the configure should find
> correct python binary and set PYTHON variable (instead of PYTHONBIN)
> in the Makefile (good example is BUILD_CC variable in Makefile.in).

That's possible, but it depends what you mean by "correct", doesn't it?
There could be many python interpreters installed on a system; which
are we to assume is "correct"?

We could make it configurable with some sort of default heuristic, I
guess, I was just going for a simple patch approximately in line with
what was done for autogen.sh for now. (And I wouldn't want to reinvent
python interpreter discovery, which has been invented enough times
already; if we were to go that route it'd probably make sense to use an
existing autoconf extension or something).

> And there are more references to the python binary in other makefiles
> which should be fixed too.

I can't find any...could those perhaps be in files generated from the
ones actually in the git repo? I grepped the whole of a clean git
checkout for 'python' and these were all I found, and with this patch
(as mentioned) I can successfully build grub using python3 on a system
with no 'python' executable at all.
-- 
Adam Williamson
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