From dce60b43126dcaa38e6845ae45e09db87aa7e229 Mon Sep 17 00:00:00 2001
From: Sem <sembrestels@riseup.net>
Date: Tue, 17 Jul 2012 02:46:53 +0200
Subject: Refs #4643. Added unlock upgrade action.

---
 actions/admin/site/unlock_upgrade.php           | 23 ++++++++++++++++++
 engine/lib/admin.php                            |  1 +
 languages/en.php                                |  3 +++
 upgrade.php                                     |  2 ++
 views/default/widgets/control_panel/content.php | 32 ++++++++++++++++++++-----
 5 files changed, 55 insertions(+), 6 deletions(-)
 create mode 100644 actions/admin/site/unlock_upgrade.php

diff --git a/actions/admin/site/unlock_upgrade.php b/actions/admin/site/unlock_upgrade.php
new file mode 100644
index 000000000..b73cf7033
--- /dev/null
+++ b/actions/admin/site/unlock_upgrade.php
@@ -0,0 +1,23 @@
+<?php
+/**
+ * Unlocks the upgrade script 
+ */
+
+// @todo Move this in ElggUpgradeManager::isLocked() when #4682 fixed
+global $CONFIG, $DB_QUERY_CACHE;
+
+$is_locked = count(get_data("show tables like '{$CONFIG->dbprefix}locked'"));
+
+// Invalidate query cache
+if ($DB_QUERY_CACHE) {
+	$DB_QUERY_CACHE->clear();
+	elgg_log("Query cache invalidated", 'NOTICE');
+}
+
+if ($is_locked) {
+	// @todo Move to ElggUpgradeManager::unlock() when #4682 fixed.
+	delete_data("drop table {$CONFIG->dbprefix}locked");
+	error_log('Upgrade unlocks itself');
+}
+system_message(elgg_echo('upgrade:unlock:success'));
+forward(REFERER);
\ No newline at end of file
diff --git a/engine/lib/admin.php b/engine/lib/admin.php
index b65d98c95..4673805f0 100644
--- a/engine/lib/admin.php
+++ b/engine/lib/admin.php
@@ -233,6 +233,7 @@ function admin_init() {
 	elgg_register_action('admin/site/update_basic', '', 'admin');
 	elgg_register_action('admin/site/update_advanced', '', 'admin');
 	elgg_register_action('admin/site/flush_cache', '', 'admin');
+	elgg_register_action('admin/site/unlock_upgrade', '', 'admin');
 
 	elgg_register_action('admin/menu/save', '', 'admin');
 
diff --git a/languages/en.php b/languages/en.php
index 18d0c88d9..159867e2f 100644
--- a/languages/en.php
+++ b/languages/en.php
@@ -1047,6 +1047,9 @@ Once you have logged in, we highly recommend that you change your password.
 	'upgrading' => 'Upgrading...',
 	'upgrade:db' => 'Your database was upgraded.',
 	'upgrade:core' => 'Your Elgg installation was upgraded.',
+	'upgrade:unlock' => 'Unlock upgrade',
+	'upgrade:unlock:confirm' => "Somebody is performing an upgrade. You should cancel and wait until upgrade is done. Are you sure you want to continue?",
+	'upgrade:unlock:success' => "Upgrade unlocked suscessfully.",
 	'upgrade:unable_to_upgrade' => 'Unable to upgrade.',
 	'upgrade:unable_to_upgrade_info' =>
 		'This installation cannot be upgraded because legacy views
diff --git a/upgrade.php b/upgrade.php
index 38be476a4..e1f3c6b9e 100644
--- a/upgrade.php
+++ b/upgrade.php
@@ -13,6 +13,7 @@
  * @subpackage Upgrade
  */
 
+// @todo Move to ElggUpgradeManager::lock() when #4628 fixed.
 function upgrade_lock() {
 	global $CONFIG, $DB_QUERY_CACHE;
 	
@@ -35,6 +36,7 @@ function upgrade_lock() {
 	return false;
 }
 
+// @todo Move to ElggUpgradeManager::unlock() when #4682 fixed.
 function upgrade_unlock() {
 	global $CONFIG;
 	delete_data("drop table {$CONFIG->dbprefix}locked");
diff --git a/views/default/widgets/control_panel/content.php b/views/default/widgets/control_panel/content.php
index d2db54bc6..e6763d851 100644
--- a/views/default/widgets/control_panel/content.php
+++ b/views/default/widgets/control_panel/content.php
@@ -11,12 +11,32 @@ elgg_register_menu_item('admin_control_panel', array(
 	'link_class' => 'elgg-button elgg-button-action',
 ));
 
-elgg_register_menu_item('admin_control_panel', array(
-	'name' => 'upgrade',
-	'text' => elgg_echo('upgrade'),
-	'href' => 'upgrade.php',
-	'link_class' => 'elgg-button elgg-button-action',
-));
+// @todo Move in this in ElggUpgradeManager::isLocked() when #4682 fixed
+global $CONFIG, $DB_QUERY_CACHE;
+$is_locked = count(get_data("show tables like '{$CONFIG->dbprefix}locked'"));
+// Invalidate query cache
+if ($DB_QUERY_CACHE) {
+	$DB_QUERY_CACHE->clear();
+	elgg_log("Query cache invalidated", 'NOTICE');
+}
+
+if (!$is_locked) {
+	elgg_register_menu_item('admin_control_panel', array(
+		'name' => 'upgrade',
+		'text' => elgg_echo('upgrade'),
+		'href' => 'upgrade.php',
+		'link_class' => 'elgg-button elgg-button-action',
+	));
+} else {
+	elgg_register_menu_item('admin_control_panel', array(
+		'name' => 'unlock_upgrade',
+		'text' => elgg_echo('upgrade:unlock'),
+		'href' => 'action/admin/site/unlock_upgrade',
+		'is_action' => true,
+		'link_class' => 'elgg-button elgg-button-delete',
+		'confirm' => elgg_echo('upgrade:unlock:confirm'),
+	));
+}
 
 echo elgg_view_menu('admin_control_panel', array(
 	'class' => 'elgg-menu-hz',
-- 
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