public static function checkUpgrade()
{
if (OC_Config::getValue('installed', false)) {
$installedVersion = OC_Config::getValue('version', '0.0.0');
$currentVersion = implode('.', OC_Util::getVersion());
if (version_compare($currentVersion, $installedVersion, '>')) {
OC_Log::write('core', 'starting upgrade from ' . $installedVersion . ' to ' . $currentVersion, OC_Log::DEBUG);
$result = OC_DB::updateDbFromStructure(OC::$SERVERROOT . '/db_structure.xml');
if (!$result) {
echo 'Error while upgrading the database';
die;
}
if (file_exists(OC::$SERVERROOT . "/config/config.php") and !is_writable(OC::$SERVERROOT . "/config/config.php")) {
$tmpl = new OC_Template('', 'error', 'guest');
$tmpl->assign('errors', array(1 => array('error' => "Can't write into config directory 'config'", 'hint' => "You can usually fix this by giving the webserver user write access to the config directory in owncloud")));
$tmpl->printPage();
exit;
}
OC_Config::setValue('version', implode('.', OC_Util::getVersion()));
}
OC_App::updateApps();
}
}