Enable hold-music on session startup.

When a local file 'hold_music.wav' is placed in the local directory it
will be used as background music at beginning of conferences, when there
is only one attendant in the room.

bbb-apply-config.yml

@@ -63,3 +63,33 @@
         path: /usr/share/bbb-web/WEB-INF/classes/bigbluebutton.properties
         regexp: '^disableRecordingDefault=.*'
         line: 'disableRecordingDefault=true'
+
+  #
+  # hold-the-line sound
+  #
+  - name: copy over hold-the-line sound
+    copy:
+        src: "hold_music.wav"
+        dest: "/opt/freeswitch/hold_music.wav"
+    when: "'hold_music.wav' is file"
+
+  - name: check if we got a sound file
+    stat:
+        path: "/opt/freeswitch/hold_music.wav"
+    register: hold_sound
+
+  - name: set path of hold-the-line sound
+    lineinfile:
+        path: /opt/freeswitch/conf/vars.xml
+        regexp: '<X-PRE-PROCESS cmd="set" data="hold_music=.*'
+        line: '  <X-PRE-PROCESS cmd="set" data="hold_music=/opt/freeswitch/hold_music.wav"/>'
+    when: hold_sound.stat.exists
+
+  - name: enable music-on-hold sound
+    xml:
+        path: /opt/freeswitch/conf/autoload_configs/conference.conf.xml
+        xpath: '/configuration/profiles/profile[@name="cdquality"]/param[@name="moh-sound"]'
+        attribute: value
+        value: '$${hold_music}'
+        backup: no
+    when: hold_sound.stat.exists