GNU bug report logs - #65383
[gnome-team] Nothing is reproducible anymore

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Liliana Marie Prikler <liliana.prikler <at> gmail.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#65383: closed ([gnome-team] Nothing is reproducible anymore)
Date: Sat, 19 Aug 2023 18:57:02 +0000

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Your message dated Sat, 19 Aug 2023 20:56:38 +0200
with message-id <1244aabbbec1dbb75281ee96a7893e3dd06feb84.camel <at> gmail.com>
and subject line Re: bug#65383: [gnome-team] Nothing is reproducible anymore
has caused the debbugs.gnu.org bug report #65383,
regarding [gnome-team] Nothing is reproducible anymore
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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65383: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=65383
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From: Liliana Marie Prikler <liliana.prikler <at> gmail.com>
To: bug-guix <at> gnu.org
Subject: [gnome-team] Nothing is reproducible anymore
Date: Sat, 19 Aug 2023 16:18:07 +0200

I have absolutely no idea how this came to be:

sh-5.1$ ./pre-inst-env guix build gdk-pixbuf --dry-run
substitute: Liste der Substitute von „https://ci.guix.gnu.org“ wird
aktualisiert … 100.0%
substitute: Liste der Substitute von „https://bordeaux.guix.gnu.org“
wird aktualisiert … 100.0%
The following derivations would be built:
  /gnu/store/sn4avcl518i75r6595ns5k1w22m1h93z-gdk-pixbuf-2.42.8.drv
  /gnu/store/z359nfywzyhbfydbnv05h1cc3av2fqbc-shared-mime-info-2.2.drv
sh-5.1$ ./pre-inst-env guix build gdk-pixbuf --dry-run
substitute: Liste der Substitute von „https://ci.guix.gnu.org“ wird
aktualisiert … 100.0%
substitute: Liste der Substitute von „https://bordeaux.guix.gnu.org“
wird aktualisiert … 100.0%
The following derivations would be built:
  /gnu/store/50pk294x08jpgzpag8z4877pa6s5bc8h-gdk-pixbuf-2.42.8.drv
  /gnu/store/5375hf13vnxab7lyrbxqg3ss7q39lxml-shared-mime-info-2.2.drv

The hash changes with each run.  What the hell is going on?

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From: Liliana Marie Prikler <liliana.prikler <at> gmail.com>
To: 65383-done <at> debbugs.gnu.org
Subject: Re: bug#65383: [gnome-team] Nothing is reproducible anymore
Date: Sat, 19 Aug 2023 20:56:38 +0200

The culprit has been found [1] and arrested [2].  It turns out that the
ungexp Bruno used at the time was "too wide", resulting in a new .drv
for shared-mime-info each time.  This wasn't caught during review,
because who has time to build things twice?

What are the lessons learned from this?
1. Closely look at when and how you use ungexp.
2. Actually build things multiple times ;)
Perhaps we can also add this to the things to check in continuous
integration, though with the fair amount of known unreproducible
packages, I'm not so sure of how great this will go.

Anyway, thanks for your attention.

Cheers

[1] http://logs.guix.gnu.org/guix/2023-08-19.log#184540
[2] http://git.savannah.gnu.org/cgit/guix.git/commit/?h=gnome-team&id=e43498b32dcbbf055d72339086213cd60c336acf

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