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From: iyzsong@member.fsf.org (=?utf-8?B?5a6L5paH5q2m?=)
Subject: Re: Configuration System's Handling of Missing Packages
Date: Thu, 24 Dec 2015 22:24:08 +0800
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In-Reply-To: <87d1twsa22.fsf@openmailbox.org> (Keith Osterheld's message of
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To: Keith Osterheld <keitho@openmailbox.org>
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Keith Osterheld <keitho@openmailbox.org> writes:

> Hi,
>
> How does the configuration system handle references to packages that
> aren't installed? For example, if I add (use-package-modules xfce) to my =
config file
> but I don't have xfce installed, will guix automatically install it, or
> will it throw errors?
=E2=80=9C(use-package-modules xfce)=E2=80=9D is same as =E2=80=9C(use-modul=
es gnu packages xfce)=E2=80=9D,
it only make the =E2=80=98xfce=E2=80=99 module avaliable (like =E2=80=98imp=
ort=E2=80=99 or =E2=80=98require=E2=80=99),
but to actually use the 'xfce' package (exported by the =E2=80=98xfce=E2=80=
=99 module),
you need to add it to the =E2=80=98packages=E2=80=99 field of the =E2=80=98=
operating-system=E2=80=99.

items (packages, configuration files, etc) will be download or build
into the =E2=80=99/gnu=E2=80=99 store when building the =E2=80=99operating-=
system=E2=80=99, and packages
listed in the =E2=80=98packages=E2=80=99 field will be =E2=80=9Cinstalled=
=E2=80=9D into the system
profile, aka =E2=80=99/run/current-system/profile=E2=80=99.

so, the anwser is =E2=80=9CYes, Guix will install it automatically=E2=80=9D.
Errors will be reported if a invalid configuration is used,
It=E2=80=99s a scheme file, so syntax and runtime errors may be common :-)