Add service that runs ‘mpc update’ on start-up

oni/home/config/rincewind.scm

@@ -128,4 +128,5 @@
                       #:type "fifo"
                       #:name "Visualizer"
                       #:path "/tmp/mpd.fifo"
-                      #:format "44100:16:2"))))))))
+                      #:format "44100:16:2")))))
+   (service home-mpc-update-service-type))))

oni/home/services/mpd.scm

@@ -12,7 +12,10 @@
 
   #:export (home-mpd-service-type
             home-mpd-configuration
-            <home-mpd-audio-output>))
+            <home-mpd-audio-output>
+
+            home-mpc-update-service-type
+            home-mpc-update-configuration))
 
 (define (serialize-boolean field value)
   "")
@@ -122,3 +125,39 @@
    (compose identity)
    (default-value (home-mpd-configuration))
    (description "Install and configure mpd.")))
+
+(define-configuration home-mpc-update-configuration
+  (package
+   (package mpd-mpc)
+   "Package to use for setting MPC update")
+  (auto-start?
+   (boolean #t)
+   "Should mpc update be started automatically"))
+
+(define (add-mpc-update-packages config)
+  (list (home-mpc-update-configuration-package config)))
+
+(define (home-mpc-update-shepherd-service config)
+  (list
+   (shepherd-service
+    (documentation "Update MPD database")
+    (provision '(mpd-update))
+    (auto-start? (home-mpc-update-configuration-auto-start? config))
+    (one-shot? #t)
+    (start
+     #~(make-forkexec-constructor
+        '(#$(file-append mpd-mpc "/bin/mpc") "update"))))))
+
+(define home-mpc-update-service-type
+  (service-type
+   (name 'home-mpc-update)
+   (extensions
+    (list (service-extension
+           home-profile-service-type
+           add-mpc-update-packages)
+          (service-extension
+           home-shepherd-service-type
+           home-mpc-update-shepherd-service)))
+   (compose identity)
+   (default-value (home-mpc-update-configuration))
+   (description "Install and configure mpc update.")))