From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Thompson, David" <dthompson2@worcester.edu>
Subject: Re: How to force rebuilding a pacakge?
Date: Thu, 2 Jun 2016 09:03:21 -0400
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To: Hartmut Goebel <h.goebel@crazy-compilers.com>
Cc: help-guix <help-guix@gnu.org>

On Thu, Jun 2, 2016 at 8:57 AM, Hartmut Goebel
<h.goebel@crazy-compilers.com> wrote:
> Hi,
>
> I just try (force-) rebuilding some package (python-scikit-learn), I do
> not succeed:
>
> - guix build =E2=80=A6 simply fetches the package from hydra
> - guix build --no-substitutes =E2=80=A6 rebuilds an lot of other stuff , =
e.g.
> fontforge-dist
> - guix build --check =E2=80=A6 does not provide a meaningful build log
> - guix build --check --log-file =E2=80=A6 does not provide a meaningful b=
uild
> log either
>   guix gc -d /gnu/store/*python-scikit-learn* does not change this
>
> Any help?

You are misundering many things about Guix here.  First, why do you
think you want to "force rebuild" something?  If you've made a change
to a build recipe, then that will naturally change the identity of the
build, thus getting a new build.  If you haven't changed the package
recipe, but want to build *just* that package from source for some
reason, you could try the following hack:

    guix environment --search-paths python-scikit-learn
    guix build --no-substitutes python-scikit-learn

The first command will fetch all the dependencies for the package,
taking advantage of substitutes.  The second command will then build
python-scikit-learn without substitutes, but it won't build anything
except python-scikit-learn because you just got all the necessary
dependencies with the prior command.  Finally, if the package build is
already present in the store, then you need to use the garbage
collector to remove it.

- Dave