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Re: How to avoid downloading qtbase:debug

From: Maxim Cournoyer
Subject: Re: How to avoid downloading qtbase:debug
Date: Thu, 27 Oct 2022 13:03:51 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.1 (gnu/linux)


Efraim Flashner <> writes:

> On Sat, Oct 22, 2022 at 12:39:54PM +0200, Csepp wrote:
>> kiasoc5 <> writes:
>> > Dear Guix,
>> >
>> > =guix shell qtbase= downloads the entire debug output of qtbase even
>> > though I didn't write down qtbase:debug. That's hundreds of megabytes
>> > of bandwith I didn't want to use. How do I avoid downloading the debug
>> > output? Is this a bug?
>> I think it should be considered a bug.  guix shell always downloads
>> every output of all the packages.
> I assume it's related to grafts:
> (ins)efraim@3900XT ~$ guix shell qtbase@6
> 321.1 MB will be downloaded
>  qtbase-6.3.1-debug 287.7MiB 3.7MiB/s 00:01 [ ] 1.4%^C
> (ins)efraim@3900XT ~$ guix shell --no-grafts qtbase@6
> (ins)efraim@3900XT ~ [env]$
> exit
> Looks like it downloads all the outputs so it can perform grafts on all
> the outputs, and only then does it put just qtbase in the environment.

Yes, and this is because grafts have been marked as non-substitutable by
choice, for performance considerations.  Would revisiting this choice
helps here (making graft derivations substitutable?).


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