From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@gnu.org>
Subject: Package inputs in manifests
Date: Sun, 17 Nov 2019 11:35:07 +0100
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 (zimoun's message of "Thu, 7 Nov 2019 13:57:08 +0100")
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To: zimoun <zimon.toutoune@gmail.com>
Cc: Guix Devel <guix-devel@gnu.org>

Hi Simon!

zimoun <zimon.toutoune@gmail.com> skribis:

>> Ah, that no.  But (guix scripts environment) has
>> =E2=80=98package-environment-inputs=E2=80=99, which does exactly that, a=
nd I guess we
>> could expose it and document it.
>
> Maybe I am doing wrong but I get:
>
> $ ./pre-inst-env guix package -p /tmp/guix-dev -m ~/tmp/manif-dep.scm
>
> installing new manifest from '/home/simon/tmp/manif-dep.scm' with 53 entr=
ies
> guix package: error: profile contains conflicting entries for gzip
> guix package: error:   first entry: gzip@1.10
> /gnu/store/py3k9zla9fj3z7430v4crqj5pyrsd3qj-gzip-1.10
> guix package: error:   second entry: gzip@1.10
> /gnu/store/i2cdl0hvrml8hjdqplqln8didnvxkgp5-gzip-1.10
> hint: You cannot have two different versions or variants of `gzip' in
> the same profile.
>
>
> where I tweak guix/scripts/environment.scm to export
> `package-environment-inputs' and ~/tmp/manif-dep.scm contains:
>
> (use-modules (guix)
>              (guix profiles)
>              (guix scripts environment)
>              (gnu packages package-management))
>
> (make-manifest (package-environment-inputs guix))

You=E2=80=99re doing it right!  It turns out that two different variants of
=E2=80=9Cgzip=E2=80=9D appear: one in =E2=80=98%final-inputs=E2=80=99 (the =
implicit inputs of
=E2=80=98gnu-build-system=E2=80=99) and another one somewhere else, hence t=
he collision.

The solution is to pass =E2=80=98--allow-collisions=E2=80=99, which is what=
 =E2=80=98guix
environment=E2=80=99 does by default precisely for that reason (see commit
afd06f605bf88a796acefc7ed598b43879346a6b).

We could check exactly why we end up with several =E2=80=98gzip=E2=80=99 in=
stances, but
overall I think this kind of thing is hard to avoid for package inputs.

Thanks,
Ludo=E2=80=99.