Fixes #6529 Throw an exception when codebase is older than schema to prevent broken race conditions

3 files changed, 37 insertions, 0 deletions

diff --git a/core/Exception/DatabaseSchemaIsNewerThanCodebaseException.php b/core/Exception/DatabaseSchemaIsNewerThanCodebaseException.php
new file mode 100644
index 0000000000..accc4ce5d5
--- /dev/null
+++ b/core/Exception/DatabaseSchemaIsNewerThanCodebaseException.php
@@ -0,0 +1,14 @@
+<?php
+/**
+ * Piwik - free/libre analytics platform
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ *
+ */
+namespace Piwik\Exception;
+
+class DatabaseSchemaIsNewerThanCodebaseException extends Exception
+{
+
+}
\ No newline at end of file
diff --git a/core/FrontController.php b/core/FrontController.php
index 7d1702315f..dbaf75e22c 100644
--- a/core/FrontController.php
+++ b/core/FrontController.php
@@ -399,6 +399,8 @@ class FrontController extends Singleton
          */
         Piwik::postEvent('Request.dispatchCoreAndPluginUpdatesScreen');
 
+        Updater::throwIfPiwikVersionIsOlderThanDBSchema();
+
         \Piwik\Plugin\Manager::getInstance()->installLoadedPlugins();
 
         // ensure the current Piwik URL is known for later use
diff --git a/core/Updater.php b/core/Updater.php
index 692034d5e9..c9872d3481 100644
--- a/core/Updater.php
+++ b/core/Updater.php
@@ -8,6 +8,7 @@
  */
 namespace Piwik;
 use Piwik\Columns\Updater as ColumnUpdater;
+use Piwik\Exception\DatabaseSchemaIsNewerThanCodebaseException;
 
 /**
  * Load and execute all relevant, incremental update scripts for Piwik core and plugins, and bump the component version numbers for completed updates.
@@ -95,6 +96,26 @@ class Updater
         return 'version_' . $name;
     }
 
+
+    /**
+     * This method ensures that Piwik Platform cannot be running when using a NEWER database
+     */
+    public static function throwIfPiwikVersionIsOlderThanDBSchema()
+    {
+        $dbSchemaVersion = self::getCurrentRecordedComponentVersion('core');
+        $current = Version::VERSION;
+        if(-1 === version_compare($current, $dbSchemaVersion)) {
+            $messages = array(
+                Piwik::translate('General_ExceptionDatabaseVersionNewerThanCodebase', array($current, $dbSchemaVersion)),
+                Piwik::translate('General_ExceptionDatabaseVersionNewerThanCodebaseWait'),
+                // we cannot fill in the Super User emails as we are failing before Authentication was ready
+                Piwik::translate('General_ExceptionContactSupportGeneric', array('', ''))
+            );
+            throw new DatabaseSchemaIsNewerThanCodebaseException(implode(" ", $messages));
+        }
+    }
+
+
     /**
      * Returns a list of components (core | plugin) that need to run through the upgrade process.
      *