Switch snap to replicaset mode

.snapcraft/resources/initmongo

-#!/bin/sh
-echo "initializing replset if necessary... in 60 seconds"
-sleep 60
-echo "after 60 seconds, checking for replset..."
-mongo $SNAP/bin/initmongoreplset.js
-

.snapcraft/resources/initmongoreplset.js

-var ism = db.isMaster();
-printjson(ism);
-if (ism.ismaster) {
-   } else 
-{
-    var msg  = rs.initiate();
-    printjson(msg);
-}

.snapcraft/resources/initreplset.js

+var ism = db.isMaster();  
+if (!ism.ismaster) {
+    rs.initiate(
+        { 
+            _id: 'rs0', 
+            members: [ 
+                { 
+                    _id: 0, 
+                    host: 'localhost:27017' 
+                } 
+            ]
+        }); 
+}

.snapcraft/resources/startRocketChat

+#!/bin/bash
+
+function start_rocketchat {
+	echo "Checking if oplog has been enabled, and enabling if not"
+	mongo $SNAP/bin/initreplset.js
+
+	export BABEL_CACHE_DIR=/tmp 
+	export ROOT_URL=http://localhost 
+	export PORT=3000 
+	export MONGO_URL=mongodb://localhost:27017/parties 
+	export MONGO_OPLOG_URL=mongodb://localhost:27017/local
+	export Accounts_AvatarStorePath=$SNAP_COMMON/uploads 
+
+	node $SNAP/main.js
+}
+
+sleep_time=5
+try_times=0
+
+function try_start {
+
+	search=$(ps --pid $(cat $SNAP_COMMON/mongod.pid) -o comm=)
+
+	if [ $search ]
+        	then
+                	start_rocketchat
+        	else
+			if [[ "$try_times" == 5 || "$try_times" > 5 ]]; then
+		                echo "Was unable to connect to Mongo.  Please make sure Mongo has started successfully: sudo systemctl status snap.rocketchat-server.rocketchat-mongo to view logs: sudo journalctl -u snap.rocketchat-server.rocketchat-mongo"
+               			 exit 1;
+        		fi
+
+			((try_times += 1))
+			((sleep_time += 5))
+                	echo "Mongo is not available, can't start. Waiting ${sleep_time} seconds and trying again"
+			sleep $sleep_time
+			try_start
+	fi
+}
+
+try_start

.snapcraft/resources/startmongo

-#!/bin/sh
-echo "initializing replset backgrounded..."
-$SNAP/bin/initmongo  &
-
-echo "Starting mongodb server in replicaset standalone mode..."
-mongod --bind_ip 127.0.0.1 --smallfiles --dbpath=$SNAP_COMMON  --journal --replSet rcreplset
-
+env LC_ALL=C mongod --bind_ip 127.0.0.1 --pidfilepath $SNAP_COMMON/mongod.pid --smallfiles --journal --dbpath=$SNAP_COMMON --replSet rs0

.snapcraft/stable/snapcraft.yaml

@@ -13,11 +13,11 @@ description: Have your own Slack like online chat, built with Meteor. https://ro
 confinement: strict
 apps:
     rocketchat-server:
-        command: env BABEL_CACHE_DIR=/tmp ROOT_URL=http://localhost PORT=3000 MONGO_URL=mongodb://localhost:27017/parties Accounts_AvatarStorePath=$SNAP_COMMON/uploads node $SNAP/main.js
+        command: startRocketChat
         daemon: simple
         plugs: [network, network-bind]
     rocketchat-mongo:
-        command: env LC_ALL=C mongod --bind_ip 127.0.0.1 --smallfiles --dbpath=$SNAP_COMMON
+        command: startmongo
         daemon: simple
         plugs: [network, network-bind]
     rocketchat-caddy:
@@ -84,10 +84,10 @@ parts:
         organize:
             rcbackup: bin/rcbackup
             startmongo: bin/startmongo
-            initmongo: bin/initmongo
+            startRocketChat: bin/startRocketChat
+            initreplset.js: bin/initreplset.js
             Caddyfile: bin/Caddyfile
             initcaddy: bin/initcaddy
-            initmongoreplset.js: bin/initmongoreplset.js
         snap:
             - bin
     caddy: