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

src/database/level.js

@@ -21,16 +21,24 @@
 		connectLevel,
 		db;
 
-	try {
-		levelup = require('levelup');
-		leveldown = require('leveldown');
-		connectLevel = require('connect-leveldb')(express);
-	} catch (err) {
-		winston.error('Unable to initialize Level DB! Is Level DB installed? Error :' + err.message);
-		process.exit();
-	}
+	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');
+			connectLevel = require('connect-leveldb')(express);
+		} catch (err) {
+			winston.error('Unable to initialize Level DB! Is Level DB installed? Error :' + err.message);
+			process.exit();
+		}
+		
 		if (db) {
 			if(typeof callback === 'function') {
 				callback();

src/database/mongo.js

@@ -11,16 +11,41 @@
 		mongoClient,
 		mongoStore;
 
-	try {
-		mongoClient = require('mongodb').MongoClient;
-		mongoStore = require('connect-mongo')(express);
-	} catch (err) {
-		winston.error('Unable to initialize MongoDB! Is MongoDB installed? Error :' + err.message);
-		process.exit();
-	}
-
+	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);
+		} catch (err) {
+			winston.error('Unable to initialize MongoDB! Is MongoDB installed? Error :' + err.message);
+			process.exit();
+		}
+		
 		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

@@ -15,16 +15,38 @@
 		postSearch,
 		topicSearch;
 
-	try {
-		redis = require('redis');
-		connectRedis = require('connect-redis')(express);
-		reds = require('reds');
-	} catch (err) {
-		winston.error('Unable to initialize Redis! Is Redis installed? Error :' + err.message);
-		process.exit();
-	}
+	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);
+			reds = require('reds');
+		} catch (err) {
+			winston.error('Unable to initialize Redis! Is Redis installed? Error :' + err.message);
+			process.exit();
+		}
+
 		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'));