From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#25095: Multiple output packages causes noop profile generations
Date: Sun, 04 Dec 2016 00:58:08 +0100
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References: <8760n2cjl1.fsf@kirby.i-did-not-set--mail-host-address--so-tickle-me>
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	(Marius Bakke's message of "Fri, 02 Dec 2016 18:43:54 +0100")
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To: Marius Bakke <mbakke@fastmail.com>
Cc: 25095@debbugs.gnu.org

Marius Bakke <mbakke@fastmail.com> skribis:

> Sorry for the non-descriptive title. It appears that having non-default
> outputs in the profile always causes a new profile generation even if
> the package derivations themselves don't change. Here is an example:
>
> $ guix package -u
> The following packages will be upgraded:
>    bind:utils   9.10.4-P4 =E2=86=92 9.10.4-P4   /gnu/store/ypv8jppwn3dvhn=
krmibw3p2h35cm30ij-bind-9.10.4-P4-utils
>    git:send-email       2.11.0 =E2=86=92 2.11.0 /gnu/store/xnm8msrlh4ac9b=
xzvf9pgai8xnjjkvwj-git-2.11.0-send-email
>    transmission:gui     2.92 =E2=86=92 2.92     /gnu/store/x2q22mfakkkf7n=
r68nfsxcvci4psz0vi-transmission-2.92-gui

[...]

> $ guix package -u
> The following packages will be upgraded:
>    transmission:gui     2.92 =E2=86=92 2.92     /gnu/store/x2q22mfakkkf7n=
r68nfsxcvci4psz0vi-transmission-2.92-gui
>    git:send-email       2.11.0 =E2=86=92 2.11.0 /gnu/store/xnm8msrlh4ac9b=
xzvf9pgai8xnjjkvwj-git-2.11.0-send-email
>    bind:utils   9.10.4-P4 =E2=86=92 9.10.4-P4   /gnu/store/ypv8jppwn3dvhn=
krmibw3p2h35cm30ij-bind-9.10.4-P4-utils

Notice how the order was reversed.  :-)

This is enough to create a new generation (the order of packages in the
manifest matters because it changes the way collisions are resolved, if
any.)

The reverse is unintended, but I suspect it has nothing to do with
multiple-output packages.

Thanks,
Ludo=E2=80=99.