added upgrade.check back into upgrade.js

src/start.js

@@ -58,16 +58,16 @@ start.start = function () {
 		if (err) {
 			switch (err.message) {
 			case 'schema-out-of-date':
-				winston.warn('Your NodeBB schema is out-of-date. Please run the following command to bring your dataset up to spec:');
-				winston.warn('    ./nodebb upgrade');
+				winston.error('Your NodeBB schema is out-of-date. Please run the following command to bring your dataset up to spec:');
+				winston.error('    ./nodebb upgrade');
 				break;
 			case 'dependencies-out-of-date':
-				winston.warn('One or more of NodeBB\'s dependent packages are out-of-date. Please run the following command to update them:');
-				winston.warn('    ./nodebb upgrade');
+				winston.error('One or more of NodeBB\'s dependent packages are out-of-date. Please run the following command to update them:');
+				winston.error('    ./nodebb upgrade');
 				break;
 			case 'dependencies-missing':
-				winston.warn('One or more of NodeBB\'s dependent packages are missing. Please run the following command to update them:');
-				winston.warn('    ./nodebb upgrade');
+				winston.error('One or more of NodeBB\'s dependent packages are missing. Please run the following command to update them:');
+				winston.error('    ./nodebb upgrade');
 				break;
 			default:
 				winston.error(err);

src/upgrade.js

@@ -51,6 +51,22 @@ var Upgrade = {
 	],
 };
 
+Upgrade.check = function (callback) {
+	// Throw 'schema-out-of-date' if not all upgrade scripts have run
+	var all = Upgrade.available.reduce(function (memo, current) {
+		memo = memo.concat(current.upgrades);
+		return memo;
+	}, []);
+
+	db.getSortedSetRange('schemaLog', 0, -1, function (err, executed) {
+		var remainder = all.filter(function (name) {
+			return executed.indexOf(name) === -1;
+		});
+
+		callback(remainder.length > 1 ? new Error('schema-out-of-date') : null);
+	});
+};
+
 Upgrade.run = function (callback) {
 	process.stdout.write('\nParsing upgrade scripts... ');
 	var queue = [];