fixed package manager detection in monitor_system_update.inc.php

server/lib/classes/cron.d/100-monitor_system_update.inc.php

@@ -159,6 +159,7 @@ class cronjob_monitor_system_update extends cronjob {
 			 * Fetch the output
 			 */
 			$data['output'] = shell_exec('zypper lu');
+
 		} elseif(file_exists('/etc/redhat-release')) {
                         /*
                          * update and find the upgrade.
@@ -168,13 +169,14 @@ class cronjob_monitor_system_update extends cronjob {
 			/* try to figure out the default package manager first */
                         if(file_exists('/usr/bin/dnf') && (is_link('/usr/bin/yum'))) {
                                 $rhPkgMgr = 'dnf';
-                        } elseif(file_exists('/usr/bin/dnf') && (!file_exists('/usr/bin/yum')) || (!is_link('/usr/bin/yum'))) {
+                        } elseif(file_exists('/usr/bin/dnf') && (!file_exists('/usr/bin/yum'))) {
                                 $rhPkgMgr = 'dnf';
                         } else {
                                 $rhPkgMgr = 'yum';
                         }
 
-                        $aptData = shell_exec($rhPkgMgr. ' -q list updates');
+			$aptData = shell_exec($rhPkgMgr. ' -q list updates');
+
                         if ($aptData == '') {
                                 /* There is nothing to update! */
                                 $state = 'ok';
@@ -188,7 +190,8 @@ class cronjob_monitor_system_update extends cronjob {
 
                         /*
                          * Fetch the output
-                         */
+			 */
+
                         $data['output'] = shell_exec($rhPkgMgr. ' -q list updates');
             
 	        } else {