Check for installed state before registering the logrotate background job

lib/base.php

@@ -491,7 +491,7 @@ class OC {
 		self::registerCacheHooks();
 		self::registerFilesystemHooks();
 		self::registerShareHooks();
-		\OCP\BackgroundJob::registerJob('OC\Log\Rotate', OC_Config::getValue("datadirectory", OC::$SERVERROOT.'/data').'/owncloud.log');
+		self::registerLogRotate();
 
 		//make sure temporary files are cleaned up
 		register_shutdown_function(array('OC_Helper', 'cleanTmp'));
@@ -553,6 +553,20 @@ class OC {
 		}
 	}
 
+	/**
+	 * register hooks for the cache
+	 */
+	public static function registerLogRotate() {
+		if (OC_Config::getValue('installed', false)) { //don't try to do this before we are properly setup
+			// register cache cleanup jobs
+			try { //if this is executed before the upgrade to the new backgroundjob system is completed it will throw an exception
+				\OCP\BackgroundJob::registerJob('OC\Log\Rotate', OC_Config::getValue("datadirectory", OC::$SERVERROOT.'/data').'/owncloud.log');
+			} catch (Exception $e) {
+
+			}
+		}
+	}
+
 	/**
 	 * register hooks for the filesystem
 	 */

lib/log/rotate.php

@@ -16,7 +16,7 @@ namespace OC\Log;
  * location and manage that with your own tools.
  */
 class Rotate extends \OC\BackgroundJob\Job {
-	const LOG_SIZE_LIMIT = 104857600; // 100 MB
+	const LOG_SIZE_LIMIT = 104857600; // 100 MiB
 	public function run($logFile) {
 		$filesize = @filesize($logFile);
 		if ($filesize >= self::LOG_SIZE_LIMIT) {