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doc: Expand sane-service-type documentation.

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* doc/guix.texi (sane-service-type): Move from between documentation
about geoclue, expand slightly.
(sane-backends-minimal): New description.
(sane-backends): New description, new example.

Signed-off-by: Nicolas Goaziou <mail@nicolasgoaziou.fr>
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raid5atemyhomework 2021-02-23 15:41:46 +01:00 committed by Nicolas Goaziou
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doc/guix.texi
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@ -19211,6 +19211,48 @@ tool. See @uref{https://www.freedesktop.org/software/colord/, the colord web
site} for more information.
@end deffn
@cindex scanner access
@defvr {Scheme Variable} sane-service-type
This service provides access to scanners @i{via}
@uref{http://www.sane-project.org, SANE} by installing the necessary
udev rules. It is included in @code{%desktop-services} (@pxref{Desktop
Services}) and relies by default on @code{sane-backends-minimal} package
(see below) for hardware support.
@end defvr
@defvr {Scheme Variable} sane-backends-minimal
The default package which the @code{sane-service-type} installs. It
supports many recent scanners.
@end defvr
@defvr {Scheme Variable} sane-backends
This package includes support for all scanners that
@code{sane-backends-minimal} supports, plus older Hewlett-Packard
scanners supported by @code{hplip} package. In order to use this on
a system which relies on @code{%desktop-services}, you may use
@code{modify-services} (@pxref{Service Reference,
@code{modify-services}}) as illustrated below:
@lisp
(use-modules (gnu))
(use-service-modules
@dots{}
desktop)
(use-package-modules
@dots{}
scanner)
(define %my-desktop-services
;; List of desktop services that supports a broader range of scanners.
(modify-services %desktop-services
(sane-service-type _ => sane-backends)))
(operating-system
@dots{}
(services %my-desktop-services)
@end lisp
@end defvr
@deffn {Scheme Procedure} geoclue-application name [#:allowed? #t] [#:system? #f] [#:users '()]
Return a configuration allowing an application to access GeoClue
location data. @var{name} is the Desktop ID of the application, without
@ -19222,13 +19264,6 @@ this application is allowed location info access. An empty users list
means that all users are allowed.
@end deffn
@cindex scanner access
@deffn {Scheme Procedure} sane-service-type
This service provides access to scanners @i{via}
@uref{http://www.sane-project.org, SANE} by installing the necessary udev
rules.
@end deffn
@defvr {Scheme Variable} %standard-geoclue-applications
The standard list of well-known GeoClue application configurations,
granting authority to the GNOME date-and-time utility to ask for the