From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: Optional runtime dependencies in Guix
Date: Mon, 12 Jan 2015 17:03:31 +0100
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In-Reply-To: <idjppakkzso.fsf@bimsb-sys02.mdc-berlin.net> (Ricardo Wurmus's
	message of "Mon, 12 Jan 2015 12:23:51 +0100")
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To: Ricardo Wurmus <ricardo.wurmus@mdc-berlin.de>
Cc: guix-devel@gnu.org

Ricardo Wurmus <ricardo.wurmus@mdc-berlin.de> skribis:

> Ludovic Court=C3=A8s writes:
>
>> Gammel Holte <gammel.holte@gmail.com> skribis:
>>
>>> For example, consider samtools, a package I use daily and that was rece=
ntly
>>> committed to Guix:
>>>
>>> http://git.savannah.gnu.org/cgit/guix.git/tree/gnu/packages/bioinformat=
ics.scm#n139
>>>
>>> It forces me to install python. In contrast, consider Arch AUR's packag=
e:
>>>
>>> https://aur.archlinux.org/packages/samtools/
>>
>> From looking at the page above, it seems that it would be feasible to
>> simply move varfilter.py to a different output.  That way, users would
>> be able to install the default output (which doesn=E2=80=99t depend on P=
ython),
>> or the =E2=80=9Cpython=E2=80=9D output.  Ricardo, WDYT?
>
> I could try to exclude this from the default output and install just the
> Python files in a separate "python" output.

Yes.

> Is there a way to specify inputs that are required by certain outputs
> only?  Then I could make the new "python" output depend on the Python
> package as an input.

There=E2=80=99s no way to do that.  So the build process would still depend=
 on
Python.  However, someone using substitutes who does not want the Python
dependency would end up downloading just the Python-less output.

Thanks,
Ludo=E2=80=99.