services: mpd: Add an 'update' action to trigger a database update.

* gnu/services/audio.scm (mpd-shepherd-service): Register a new update action.
* doc/guix.texi (Audio Services): Document it.

1 files changed, 10 insertions, 0 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index b5eca57d75..ea1e391a6f 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -34251,6 +34251,16 @@ The following example shows how one might run @code{mpd} as user
           (port "6666")))
 @end lisp
 
+Most MPD clients will trigger a database update upon connecting, but you
+can also use the @code{update} action do to so:
+
+@example
+herd update mpd
+@end example
+
+All the MPD configuration fields are documented below, and a more
+complex example follows.
+
 @defvar mpd-service-type
 The service type for @command{mpd}
 @end defvar