Tidying

src/freedombone-app-syncthing

 # License
 # =======
 #
-# Copyright (C) 2014-2016 Bob Mottram <bob@freedombone.net>
+# Copyright (C) 2014-2017 Bob Mottram <bob@freedombone.net>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as published by
     mark_completed $FUNCNAME
 }
 
-function install_syncthing {
-    apt-get -yq install curl
+function install_syncthing_repo {
+    if [ -f /etc/apt/sources.list.d/syncthing.list ]; then
+        return
+    fi
 
+    apt-get -yq install curl
     curl -s https://syncthing.net/release-key.txt | apt-key add -
     echo "deb http://apt.syncthing.net/ syncthing release" | tee /etc/apt/sources.list.d/syncthing.list
     apt-get update
+}
+
+function install_syncthing {
+    install_syncthing_repo
     apt-get -yq install syncthing
 
     # This probably does need to run as root so that it can access the Sync directories