Log last cron execution

Fixes #2012

config/config.sample.php

@@ -178,6 +178,9 @@ $CONFIG = array(
 /* Enable or disable the logging of IP addresses in case of webform auth failures */
 "log_authfailip" => false,
 
+/* Whether ownCloud should log the last successfull cron exec */
+"cron_log" => true,
+
 /* Whether http-basic username must equal username to login */
 "basic_auth" => true,
 

cron.php

@@ -119,6 +119,10 @@ try {
 
 	// done!
 	TemporaryCronClass::$sent = true;
+	// Log the successfull cron exec
+	if (OC_Config::getValue('cron_log', true)) {
+		OC_Appconfig::setValue('core', 'lastcron', time());
+	}
 	exit();
 
 } catch (Exception $ex) {

settings/admin.php

@@ -40,6 +40,8 @@ $tmpl->assign('isWebDavWorking', OC_Util::isWebDAVWorking());
 $tmpl->assign('has_fileinfo', OC_Util::fileInfoLoaded());
 $tmpl->assign('old_php', OC_Util::isPHPoutdated());
 $tmpl->assign('backgroundjobs_mode', OC_Appconfig::getValue('core', 'backgroundjobs_mode', 'ajax'));
+$tmpl->assign('cron_log', OC_Config::getValue('cron_log', true));
+$tmpl->assign('lastcron', OC_Appconfig::getValue('core', 'lastcron', false));
 $tmpl->assign('shareAPIEnabled', OC_Appconfig::getValue('core', 'shareapi_enabled', 'yes'));
 
 // Check if connected using HTTPS

settings/css/settings.css

@@ -167,6 +167,13 @@ table.shareAPI td { padding-bottom: 0.8em; }
 	width: 40px;
 }
 
+.cronstatus {
+	display: inline-block;
+	height: 16px;
+	width: 16px;
+	vertical-align: text-bottom;
+}
+
 /* HELP */
 .pressed {background-color:#DDD;}
 

settings/templates/admin.php

@@ -178,6 +178,23 @@ if (!$_['internetconnectionworking']) {
 				<label for="backgroundjobs_cron">Cron</label><br/>
 				<em><?php p($l->t("Use systems cron service to call the cron.php file every 15 minutes.")); ?></em>
 	</p>
+	<?php if ($_['cron_log']): ?>
+	<p>
+		<?php if ($_['lastcron'] !== false):
+			$human_time = date('Y-m-d H:i', $_['lastcron']) . " UTC";
+			if (time() - $_['lastcron'] <= 3600): ?>
+				<span class="cronstatus success"></span>
+				<?php p($l->t("Last cron was executed at %s.", array($human_time)));
+			else: ?>
+				<span class="cronstatus error"></span>
+				<?php p($l->t("Last cron was executed at %s. This is more than an hour ago, something seems wrong.", array($human_time)));
+			endif;
+		else: ?>
+			<span class="cronstatus error"></span>
+			<?php p($l->t("Cron was not executed yet!"));
+		endif; ?>
+	</p>
+	<?php endif; ?>
 </fieldset>
 
 <fieldset class="personalblock" id="shareAPI">