From: David Thompson <dthompson2@worcester.edu>
To: "Ludovic Courtès" <ludo@gnu.org>
Cc: Guix-devel <guix-devel@gnu.org>,
bug-guix@gnu.org, Federico Beffa <beffa@ieee.org>
Subject: Re: guix environment
Date: Tue, 03 Feb 2015 16:15:21 -0500 [thread overview]
Message-ID: <87lhkeitna.fsf@fsf.org> (raw)
In-Reply-To: <87k2zypwmb.fsf@inria.fr>
Ludovic Courtès <ludo@gnu.org> writes:
> LGTM, please push!
Pushed.
> There’s another problem, though. When a dependency is a multiple-output
> package, all its outputs are added to the environment, because
> ‘package->transitive-inputs’ discards the information of which output is
> needed.
Yes, I had thought about this, but couldn't think of a way to preserve
that information throughout the program.
> So for instance, both the ‘out’ and the ‘debug’ output of Coreutils end
> up being downloaded and added to the environment, even though only ‘out’
> is an input.
>
> Now, the problem is that ‘build-derivations’ can only build *all* the
> outputs of the given derivation. This could be worked around either:
>
> 1. by creating a “sink” derivation, for instance with
> ‘profile-derivation’, that could refer precisely to the output(s)
> needed; not ideal.
>
> 2. by using (build-things (list "/the/output/path")) and resorting to
> ‘build-derivations’ only if the ‘build-things’ call did nothing
> (when passed a non-.drv store item, ‘build-things’ tries to
> substitute and does nothing if that fails.)
>
> Thoughts?
I don't like option #1. I haven't fully grokked option #2, but I guess
that will be the next thing to try.
Thanks for the nudge in the right direction.
--
David Thompson
Web Developer - Free Software Foundation - http://fsf.org
GPG Key: 0FF1D807
Support the FSF: https://fsf.org/donate
next prev parent reply other threads:[~2015-02-03 21:15 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-20 17:21 guix environment Federico Beffa
2015-01-20 21:43 ` Ludovic Courtès
2015-01-20 21:56 ` David Thompson
2015-01-29 23:00 ` David Thompson
2015-02-03 20:29 ` Ludovic Courtès
2015-02-03 21:15 ` David Thompson [this message]
2015-02-08 18:22 ` bug#19641: " Ludovic Courtès
2015-02-08 18:22 ` Ludovic Courtès
-- strict thread matches above, loose matches on Subject: below --
2015-06-15 6:55 Pjotr Prins
2015-06-15 7:14 ` Ricardo Wurmus
2015-06-15 13:10 ` Thompson, David
2015-06-15 19:10 ` Pjotr Prins
2015-06-15 19:22 ` Thompson, David
2015-06-16 5:52 ` Pjotr Prins
2015-06-16 7:59 ` Ludovic Courtès
2015-06-16 10:04 ` Pjotr Prins
2015-06-16 11:23 ` Ludovic Courtès
2015-06-16 14:39 ` Pjotr Prins
2015-06-15 13:27 ` Claes Wallin (韋嘉誠)
2015-06-15 20:09 ` Ludovic Courtès
2015-06-16 5:06 ` Claes Wallin (韋嘉誠)
2019-06-01 16:53 H.Nasajpour<PantherX>
2019-06-01 18:42 ` Christopher Baines
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