bug#26733: document (list package output) in operating-system-packages

[Kei Kebreau <kei@openmailbox.org>]

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Julien Lepiller <julien@lepiller.eu> writes:

> Hi,
>
> here is a small patch to document how to make globally visible a
> specific output of a package.
>
>>From 6a71d7613bbabdde9d43de5ff09601195f9f49ee Mon Sep 17 00:00:00 2001
> From: Julien Lepiller <julien@lepiller.eu>
> Date: Mon, 1 May 2017 15:44:31 +0200
> Subject: [PATCH] doc: Document (list package output) syntax in
>  operanting-system-packages.
>
> * doc/guix.texi (Globally-Visible Packages): Document (PACKAGE OUTPUT) syntax.
> ---
>  doc/guix.texi | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/doc/guix.texi b/doc/guix.texi
> index 957ce2bab..3ae9a1cd5 100644
> --- a/doc/guix.texi
> +++ b/doc/guix.texi
> @@ -7678,7 +7678,19 @@ provides all the tools one would expect for basic user and administrator
>  tasks---including the GNU Core Utilities, the GNU Networking Utilities,
>  the GNU Zile lightweight text editor, @command{find}, @command{grep},
>  etc.  The example above adds tcpdump to those, taken from the @code{(gnu
> -packages admin)} module (@pxref{Package Modules}).
> +packages admin)} module (@pxref{Package Modules}).  The
> +@code{(list package output)} syntax can be used to add a specific output
> +of a package:
> +
> +@lisp
> +(use-modules (gnu packages))
> +(use-modules (gnu packages dns))
> +
> +(operating-system
> +  ;; ...
> +  (packages (cons (list bind "utils")
> +                  %base-packages)))
> +@end lisp
>  
>  @findex specification->package
>  Referring to packages by variable name, like @var{tcpdump} above, has

At first glance this change looks okay, but I'll wait for a second
opinion to be safe (I don't usually review documentation changes).

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