bug#34531: Guix profile fails on Overdrive 1000

[Danny Milosavljevic <dannym@scratchpost.org>]

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Hi Ricardo,
Hi Andreas,

On Tue, 19 Feb 2019 14:23:23 +0100
Ricardo Wurmus <rekado@elephly.net> wrote:

> Andreas Enge <andreas@enge.fr> writes:
> 
> > Before closing the bug, I would still like to ask whether there is a way
> > of getting around the need for python.  
> 
> Guix pull needs “guile-git”, and “guile-git” needs “libgit2”, which
> needs “python-wrapper”.  To remove the need for Python in “guix pull” we
> would need to build libgit2 without Python.  I don’t know if anyone has
> investigated whether this can be done.

I have read it now--in the interest of simplicity and bootstrappability.

Python is only required to generate some libgit2 tests.  It would be easy
to port the one Python program "generate.py" to some other language.

"generate.py" is from clar, which appears to be https://github.com/vmg/clar .

If someone were to replace it, that would be the correct place to contribute
it.

Python is listed as a regular input in libgit2.
I think it should be a native-input instead.

The dependency graph of libgit2 is very small after removing Python.
The languages it still depends on (possibly indirectly) are:

* Perl 5.28.0
* Guile 2.0.14
* bash 4.4.23

So writing the generate.py in one of those languages would not make the
dependency graph bigger than necessary.

generate.py uses regular expressions, simple file I/O, string templating
and that's pretty much it.

In any case, the first simplification would be just to move Python from
regular input to native-input.

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