From b701bbd8c5f6051ec0f4bd360473290cf9ebdf71 Mon Sep 17 00:00:00 2001
From: Lukas Reschke <lukas@owncloud.com>
Date: Mon, 16 Feb 2015 22:36:08 +0100
Subject: [PATCH] Use APCu only if available in version 4.0.6 and higher

APCu before 4.0.6 is unbelievable buggy and tend to segfault the PHP process (i.e. the whole webserver)

This potentially fixes https://github.com/owncloud/core/issues/14175

Requires a backport to stable8
---
 lib/private/memcache/apcu.php |  2 ++
 settings/admin.php            |  4 ++++
 settings/templates/admin.php  | 15 +++++++++++++++
 3 files changed, 21 insertions(+)

diff --git a/lib/private/memcache/apcu.php b/lib/private/memcache/apcu.php
index 7f780f3271..1043690a36 100644
--- a/lib/private/memcache/apcu.php
+++ b/lib/private/memcache/apcu.php
@@ -14,6 +14,8 @@ class APCu extends APC {
 			return false;
 		} elseif (!ini_get('apc.enable_cli') && \OC::$CLI) {
 			return false;
+		} elseif (version_compare(phpversion('apc'), '4.0.6') === -1) {
+			return false;
 		} else {
 			return true;
 		}
diff --git a/settings/admin.php b/settings/admin.php
index cdbc2700a8..32e92edb14 100644
--- a/settings/admin.php
+++ b/settings/admin.php
@@ -85,6 +85,10 @@ $template->assign('databaseOverload', $databaseOverload);
 // warn if Windows is used
 $template->assign('WindowsWarning', OC_Util::runningOnWindows());
 
+// warn if outdated version of APCu is used
+$template->assign('ApcuOutdatedWarning',
+	extension_loaded('apcu') && version_compare(phpversion('apc'), '4.0.6') === -1);
+
 // add hardcoded forms from the template
 $forms = OC_App::getForms('admin');
 $l = OC_L10N::get('settings');
diff --git a/settings/templates/admin.php b/settings/templates/admin.php
index 363b4741b7..1f7eacd746 100644
--- a/settings/templates/admin.php
+++ b/settings/templates/admin.php
@@ -143,9 +143,24 @@ if ($_['WindowsWarning']) {
 	</p>
 
 </div>
+
 <?php
 }
 
+// APCU Warning if outdated
+if ($_['ApcuOutdatedWarning']) {
+	?>
+	<div class="section">
+		<h2><?php p($l->t('APCu below version 4.0.6 installed'));?></h2>
+
+		<p class="securitywarning">
+			<?php p($l->t('APCu below version 4.0.6 is installed, for stability and performance reasons we recommend to update to a newer APCu version.')); ?>
+		</p>
+
+	</div>
+
+<?php
+}
 // if module fileinfo available?
 if (!$_['has_fileinfo']) {
 	?>