bug#65383: [gnome-team] Nothing is reproducible anymore

bug#65383: [gnome-team] Nothing is reproducible anymore

[Liliana Marie Prikler]

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?

bug#65383: [gnome-team] Nothing is reproducible anymore

[Janneke Nieuwenhuizen]

Liliana Marie Prikler writes:

> 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?

Just this morning, looking at <https://issues.guix.gnu.org/65179> I
found that AR (okay x86_64-w64-mingw32-AR) embeds timestamps in the
archives it creates.

Greetings,
Janneke

-- 
Janneke Nieuwenhuizen <janneke@gnu.org>  | GNU LilyPond https://LilyPond.org
Freelance IT https://www.JoyOfSource.com | Avatar® https://AvatarAcademy.com

bug#65383: [gnome-team] Nothing is reproducible anymore

[Dr. Arne Babenhauserheide]

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Liliana Marie Prikler <liliana.prikler@gmail.com> writes:

> I have absolutely no idea how this came to be:
> …
> The hash changes with each run.  What the hell is going on?

I don’t know. I’ve seen a not reproducible error with guix challenge
guile.

I would expect this when running with --tune, but not from the build
servers:

$ LANG=C guix challenge guile
/gnu/store/4gvgcfdiz67wv04ihqfa8pqwzsb0qpv5-guile-3.0.9 contents differ:
  local hash: 1mn4ahip1cywc2nkq7lbgjfgdws9r283r3r12yq6ijg1b2zi5yz6
  https://ci.guix.gnu.org/nar/lzip/4gvgcfdiz67wv04ihqfa8pqwzsb0qpv5-guile-3.0.9: 1mn4ahip1cywc2nkq7lbgjfgdws9r283r3r12yq6ijg1b2zi5yz6
  https://bordeaux.guix.gnu.org/nar/lzip/4gvgcfdiz67wv04ihqfa8pqwzsb0qpv5-guile-3.0.9: 17gvhxrcngyjjy2mlr9j2x6xv0x16b7dnf6dpz00vfqvddq9i2dz
  differing file:
    /lib/guile/3.0/ccache/ice-9/ftw.go

1 store items were analyzed:
  - 0 (0.0%) were identical
  - 1 (100.0%) differed
  - 0 (0.0%) were inconclusive

Best wishes,
Arne
-- 
Unpolitisch sein
heißt politisch sein,
ohne es zu merken.
draketo.de

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bug#65383: [gnome-team] Nothing is reproducible anymore

[Liliana Marie Prikler]

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