bug#35034: guile2.0-git rewrites libgit2 input to use guile-2.0

["Ludovic Courtès" <ludo@gnu.org>]

Hi Mark,

Mark H Weaver <mhw@netris.org> skribis:

> retitle 35034 guile2.0-git rewrites libgit2 input to use guile-2.0
> thanks
>
> It turns out that this problem is not specific to armhf.  'guile2.0-git'
> recently started failing to build on all Hydra-supported systems.
>
> I see now what's going on.  The problem was introduced by:
>
>   commit 03fb5ff6ae01a680c786d9ee148839543c519411
>   Author: Danny Milosavljevic <dannym@scratchpost.org>
>   Date:   Thu Mar 21 23:28:43 2019 +0100
>   
>     gnu: libgit2: Avoid Python.

[...]

> The 'guile-git' package has 'libgit2' as an input.  The 'guile2.0-git'
> variant package uses 'package-for-guile-2.0' to rewrite 'guile-git' to
> use 'guile-2.0'.  Unfortunately, this rewrites more deeply than we
> probably want.  In this case, the rewriting extends into 'libgit2',
> changing its native-input from 'guile-2.2' to 'guile-2.0'.  However, the
> Guile code that Danny wrote doesn't work with 'guile-2.0', because it
> uses the (ice-9 textual-ports) module, which doesn't exist in Guile 2.0.

I’m tempted to sidestep the problem by removing “guile2.0-git”, which I
think is of little use.

WDYT?

Ludo’.