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services: mpd: Update basic example. 

Relates to <https://issues.guix.gnu.org/63082>.

* doc/guix.texi (Audio Services): Do not use a deprecated user form; keep the
default one.  Remove port.  Specify a music-directory.  Mention the importance
of permissions on the music directory.
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Maxim Cournoyer 2023-04-28 00:13:56 -04:00
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@ -34241,16 +34241,27 @@ The Music Player Daemon (MPD) is a service that can play music while
being controlled from the local machine or over the network by a variety
of clients.
The following example shows how one might run @code{mpd} as user
@code{"bob"} on port @code{6666}. It uses pulseaudio for output.
The following example shows the simplest configuration to locally
expose, via PulseAudio, a music collection kept at @file{/srv/music},
with @command{mpd} running as the default @samp{mpd} user. This user
will spawn its own PulseAudio daemon, which may compete for the sound
card access with that of your own user. In this configuration, you may
have to stop the playback of your user audio applications to hear MPD's
output and vice-versa.
@lisp
(service mpd-service-type
(mpd-configuration
(user "bob")
(port "6666")))
(music-directory "/srv/music")))
@end lisp
@quotation Important
The music directory must be readable to the MPD user, by default,
@samp{mpd}. Permission problems will be reported via @samp{Permission
denied} errors in the MPD logs, which appear in @file{/var/log/messages}
by default.
@end quotation
Most MPD clients will trigger a database update upon connecting, but you
can also use the @code{update} action do to so: