From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#28310: guix build -n misses package builds
Date: Sat, 02 Sep 2017 01:08:12 +0200
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References: <20170831190334.GA6673@jurong>
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To: Andreas Enge <andreas@enge.fr>
Cc: 28310@debbugs.gnu.org

Hello,

Andreas Enge <andreas@enge.fr> skribis:

> I am right now in the process of updating pari-gp to version 2.9.3.
> After building it on a git check-out of three days ago, which went smooth=
ly,
> I rebased my patch on today's master and was pleased to see that no rebui=
ld
> was needed:
>
> $ ./pre-inst-env guix build pari-gp -n
> outputs nothing.
>
> However, once the -n dropped, the gd package gets built.
> And then it is starting ruby, which has no connection to pari-gp:
> Downloading https://mirror.hydra.gnu.org/guix/nar/229n3pzp5bdmbdvwslg0dxl=
iysas92k5-ruby-2.4.1.tar.xz...
>    ruby-2.4.1.tar.xz  9.5MiB                                             =
                                                          22KiB/s 00:06 [  =
                  ]   1.3%^

=E2=80=9C-n=E2=80=9D now implies =E2=80=9C--no-grafts=E2=80=9D (commit
fd59105c49965db956fac73c68d8b00d068f5d5c).  This was motivated by the
need to have -n really perform a dry run.

The downside is that with -n we now see only half of the build plan, and
when we remove -n, we start with the other half of the build plan,
grafting.

The =E2=80=9Cbuild continuation=E2=80=9D idea of =E2=80=98wip-gexp-grafts=
=E2=80=99, discussed in
<https://bugs.gnu.org/22990>, could in theory help with that.

Ludo=E2=80=99.