bug#18534: problems with "guix pull"

[ludo@gnu.org (Ludovic Courtès)]

ludo@gnu.org (Ludovic Courtès) skribis:

> The old ‘guix pull’ didn’t now about the gnu.scm file, hence the error
> (this was fixed in June, in commit 9d0b8fbd.)
>
> That means you have to actually run ‘guix pull’ from 0.7, or from a
> recent checkout.
>
> The fact that ‘guix pull’ can potentially break for some future version
> is unfortunate.  It would be ideal if instead of using its own build
> recipe, it would use one from the tarball.

[...]

> Igor Gajsin <igajsin@mirantis.com> skribis:
> 
> > This is a output of `guix pull --verbose`
> >
> > compiling
> > /gnu/store/akma9bmmjnizkv9sj1669wa8x4abrzyp-guix-latest/guix/import/pypi.scm'...
> > ERROR: no code for module (json)
> 
> For now, this problem can be worked around as described here:
> 
>   http://lists.gnu.org/archive/html/guix-devel/2014-09/msg00488.html

This bug should be fixed by f81ac34.

The idea is that the build recipe that is executed is now taken from the
newly-downloaded Guix.  Before that, we would use the build recipe from
whatever Guix version was running, hence this kind of problems.

Comments and testing welcome!

Thanks,
Ludo’.