GNU bug report logs - #53030
Can't (specification->package "package@version:output")

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From: Tobias Geerinckx-Rice <me <at> tobias.gr>
To: calcium <calcium <at> disroot.org>
Cc: 53030 <at> debbugs.gnu.org
Subject: bug#53030: Can't (specification->package "package <at> version:output")
Date: Wed, 05 Jan 2022 21:36:02 +0100

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Calcium,

Thanks for the report!

In future, please submit separate issues separately, it helps keep 
discussion, er, separate.  It's easier to merge issues than to 
split them.

> Can't (specification->package "package <at> version:output")

Short answer: it is not intended to work.  Use 
specification->package+output if you want outputs.  This is not a 
bug but a design decision.  Which are not above critique, but 
guix-devel@ might be a better place for that.

I've considered in the past to submit a cheeky patch silently 
renaming specification->package+ouput to specification->package, 
just to avoid this FAQ.  It should be almost perfectly backwards 
compatible in that no existing code should break with the same 
input.

However I think clarity the greater value here, and did not submit 
such a patch.

calcium via Bug reports for GNU Guix 写道：
> The syntaxe to specify a package version and desired output
> only works on guix install package <at> version:output
>
> guix remove package <at> version:output doesn't works

I cannot reproduce this:

 $ guix install git <at> 2.34.0:send-email
 $ guix remove git <at> 2.34.0:send-email
 $

Can you provide an example?

> guix remove package <at> version doesn't works

‘package <at> version’ means ‘package <at> version:out’, not (a 
hypothetical) ‘package <at> version:*’ wildcard.  It neither installs 
nor removes ‘all outputs’.

I did notice that, e.g.,

 $ guix install git <at> 2:send-email
 $ guix remove git <at> 2:send-email
 guix remove: error: package 'git <at> 2:send-email' not found in 
 profile
 $

is asymmetrical.  I wonder if there are any drawbacks to making it 
work.

Kind regards,

T G-R

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