GNU bug report logs - #61255
[PATCH 0/5] Add support for the RPM format to "guix pack"

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Message #109 received at 61255 <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
Cc: Josselin Poiret <dev <at> jpoiret.xyz>, Christopher Baines <mail <at> cbaines.net>,
 Simon Tournier <zimon.toutoune <at> gmail.com>, Mathieu Othacehe <othacehe <at> gnu.org>,
 Tobias Geerinckx-Rice <me <at> tobias.gr>, Ricardo Wurmus <rekado <at> elephly.net>,
 61255 <at> debbugs.gnu.org, 61841 <at> debbugs.gnu.org
Subject: Re: bug#61841: ‘guix shell’ computes
 different package derivation than ‘guix build’
Date: Mon, 27 Feb 2023 22:08:37 +0100

Maxim Cournoyer <maxim.cournoyer <at> gmail.com> skribis:

> Ludovic Courtès <ludo <at> gnu.org> writes:

[...]

>> Commit 68775338a510f84e63657ab09242d79e726fa457 turned out to have
>> unintended side effects:
>>
>>   https://issues.guix.gnu.org/61841
>
> Ugh.
>
>> I fixed it with:
>>
>>   a516a0ba93 gexp: computed-file: Do not honor %guile-for-build.
>>   fee1d08f0d pack: Make sure tests can run without a world rebuild.
>>
>> Please take a look.
>
> Thank you.  I still think it'd be nicer if computed-file had a means to
> honor %guile-for-build rather than having to accommodate it specially as
> you did in fee1d08f0d, so that it'd be symmetrical to gexp->derivation
> in that regard.  Why can't they?

Like I wrote, ‘default-guile’ returns a package whereas
‘%guile-for-build’ returns a derivation.

The latter is inherently lower-level: it’s used together with the
monadic interface or with plain ‘derivation’, when we know which system
we’re targeting.  The former is higher-level, system-independent; it
must be used for <computed-file> and similar forms, which are
system-independent.

Ludo’.

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