Enable running multiple upgrades at once (#5984)

app.js

@@ -219,14 +219,13 @@ function upgrade() {
 	var meta = require('./src/meta');
 	var upgrade = require('./src/upgrade');
 	var build = require('./src/meta/build');
-	var tasks = [db.init, meta.configs.init, upgrade.run, build.buildAll];
+	var tasks = [db.init, meta.configs.init];
 
 	if (nconf.get('upgrade') !== true) {
 		// Likely an upgrade script name passed in
-		tasks[2] = async.apply(upgrade.runSingle, nconf.get('upgrade'));
-
-		// Skip build
-		tasks.pop();
+		tasks.push(async.apply(upgrade.runParticular, nconf.get('upgrade').split(',')));
+	} else {
+		tasks.push(upgrade.run, build.buildAll);
 	}
 	// disable mongo timeouts during upgrade
 	nconf.set('mongo:options:socketTimeoutMS', 0);

src/upgrade.js

@@ -87,23 +87,19 @@ Upgrade.run = function (callback) {
 	});
 };
 
-Upgrade.runSingle = function (query, callback) {
+Upgrade.runParticular = function (names, callback) {
 	process.stdout.write('\nParsing upgrade scripts... ');
 
 	async.waterfall([
 		async.apply(file.walk, path.join(__dirname, './upgrades')),
 		function (files, next) {
-			next(null, files.filter(function (file) {
-				return path.basename(file, '.js') === query;
-			}));
-		},
-	], function (err, files) {
-		if (err) {
-			return callback(err);
-		}
+			var upgrades = files.filter(function (file) {
+				return names.indexOf(path.basename(file, '.js')) !== -1;
+			});
 
-		Upgrade.process(files, 0, callback);
-	});
+			Upgrade.process(upgrades, 0, next);
+		},
+	], callback);
 };
 
 Upgrade.process = function (files, skipCount, callback) {