GNU bug report logs - #65225
‘guix shell --system=ALIEN’ builds for both systems

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From: Ludovic Courtès <ludo <at> gnu.org>
To: Simon Tournier <zimon.toutoune <at> gmail.com>
Cc: Josselin Poiret <dev <at> jpoiret.xyz>, 65225 <at> debbugs.gnu.org, Mathieu Othacehe <othacehe <at> gnu.org>, Tobias Geerinckx-Rice <me <at> tobias.gr>, Ricardo Wurmus <rekado <at> elephly.net>, 66640 <at> debbugs.gnu.org, Christopher Baines <guix <at> cbaines.net>
Subject: bug#65225: [bug#66640] [PATCH 0/2] Build profile hooks for the right system
Date: Mon, 23 Oct 2023 21:53:06 +0200

Simon Tournier <zimon.toutoune <at> gmail.com> skribis:

> Do I understand correctly when I consider that
> ’(efi-bootloader-profile-hook manifest)’ pass #false as ’system’ and
> then it is ’set-guile-for-build’ that sets ’(%current-system)’?

Yes.

> Somehow, my question is about the readability of default values.
>
> Why not,
>
>     #:system (or system (%current-system))
>
> for all the hooks?

Because that value would be captured at call time rather than at
monadic-bind time.  See Josselin’s excellent explanation of this trap:

  https://issues.guix.gnu.org/65225#4-lineno34

HTH!

Ludo’.

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