don't attempt to initialize db until we attempt to initialize

src/database/level.js

@@ -21,6 +21,15 @@
 		connectLevel,
 		db;
 
+	module.questions = [
+		{
+			name: "level:database",
+			description: "Enter the path to your Level database",
+			'default': nconf.get('level:database') || '/var/level/nodebb'
+		}
+	];
+
+	module.init = function(callback) {
 		try {
 			levelup = require('levelup');
 			leveldown = require('leveldown');
@@ -30,7 +39,6 @@
 			process.exit();
 		}
 		
-	module.init = function(callback) {
 		if (db) {
 			if(typeof callback === 'function') {
 				callback();

src/database/mongo.js

@@ -11,6 +11,33 @@
 		mongoClient,
 		mongoStore;
 
+	module.questions = [
+		{
+			name: 'mongo:host',
+			description: 'Host IP or address of your MongoDB instance',
+			'default': nconf.get('mongo:host') || '127.0.0.1'
+		},
+		{
+			name: 'mongo:port',
+			description: 'Host port of your MongoDB instance',
+			'default': nconf.get('mongo:port') || 27017
+		},
+		{
+			name: 'mongo:username',
+			description: 'MongoDB username'
+		},
+		{
+			name: 'mongo:password',
+			description: 'Password of your MongoDB database'
+		},
+		{
+			name: "mongo:database",
+			description: "Which database to use",
+			'default': nconf.get('mongo:database') || 0
+		}
+	];
+
+	module.init = function(callback) {
 		try {
 			mongoClient = require('mongodb').MongoClient;
 			mongoStore = require('connect-mongo')(express);
@@ -19,8 +46,6 @@
 			process.exit();
 		}
 		
-
-	module.init = function(callback) {
 		mongoClient.connect('mongodb://'+ nconf.get('mongo:host') + ':' + nconf.get('mongo:port') + '/' + nconf.get('mongo:database'), function(err, _db) {
 			if(err) {
 				winston.error("NodeBB could not connect to your Mongo database. Mongo returned the following error: " + err.message);

src/database/redis.js

@@ -15,6 +15,29 @@
 		postSearch,
 		topicSearch;
 
+	module.questions = [
+		{
+			name: 'redis:host',
+			description: 'Host IP or address of your Redis instance',
+			'default': nconf.get('redis:host') || '127.0.0.1'
+		},
+		{
+			name: 'redis:port',
+			description: 'Host port of your Redis instance',
+			'default': nconf.get('redis:port') || 6379
+		},
+		{
+			name: 'redis:password',
+			description: 'Password of your Redis database'
+		},
+		{
+			name: "redis:database",
+			description: "Which database to use (0..n)",
+			'default': nconf.get('redis:database') || 0
+		}
+	];
+
+	module.init = function(callback) {
 		try {
 			redis = require('redis');
 			connectRedis = require('connect-redis')(express);
@@ -24,7 +47,6 @@
 			process.exit();
 		}
 
-	module.init = function(callback) {
 		if (redis_socket_or_host && redis_socket_or_host.indexOf('/')>=0) {
 			/* If redis.host contains a path name character, use the unix dom sock connection. ie, /tmp/redis.sock */
 			redisClient = redis.createClient(nconf.get('redis:host'));