Incomplete installation

<?php
/***************************************************************
*  Copyright notice
*
*  (c) 2013 Jérôme Schneider <mail@jeromeschneider.fr>
*  All rights reserved
*
*  http://baikal-server.com
*
*  This script is part of the Baïkal Server project. The Baïkal
*  Server project is free software; you can redistribute it
*  and/or modify it under the terms of the GNU General Public
*  License as published by the Free Software Foundation; either
*  version 2 of the License, or (at your option) any later version.
*
*  The GNU General Public License can be found at
*  http://www.gnu.org/copyleft/gpl.html.
*
*  This script is distributed in the hope that it will be useful,
*  but WITHOUT ANY WARRANTY; without even the implied warranty of
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*  GNU General Public License for more details.
*
*  This copyright notice MUST APPEAR in all copies of the script!
***************************************************************/

ini_set("session.cookie_httponly", 1);
ini_set("display_errors", 0);
ini_set("log_errors", 1);
error_reporting(E_ALL);

define("BAIKAL_CONTEXT", TRUE);
define("BAIKAL_CONTEXT_INSTALL", TRUE);
define("PROJECT_CONTEXT_BASEURI", "/admin/install/");

if(file_exists(dirname(dirname(getcwd())) . "/Core")) {
	# Flat FTP mode
	define("PROJECT_PATH_ROOT", dirname(dirname(getcwd())) . "/");	#../../
} else {
	# Dedicated server mode
	define("PROJECT_PATH_ROOT", dirname(dirname(dirname(getcwd()))) . "/");	# ../../../
}

if(!file_exists(PROJECT_PATH_ROOT . 'vendor/')) {
	die('<h1>Incomplete installation</h1><p>Ba&iuml;kal dependencies have not been installed. Please, execute "<strong>composer install</strong>" in the folder where you installed Ba&iuml;kal.');
}

require PROJECT_PATH_ROOT . "vendor/autoload.php";

# Bootstraping Flake
\Flake\Framework::bootstrap();

# Bootstrap BaikalAdmin
\BaikalAdmin\Framework::bootstrap();

# Evaluate assertions
\BaikalAdmin\Core\Auth::assertUnlocked();

# Create and setup a page object
$oPage = new \Flake\Controller\Page(BAIKALADMIN_PATH_TEMPLATES . "Page/index.html");
$oPage->injectHTTPHeaders();
$oPage->setTitle("Baïkal Maintainance");
$oPage->setBaseUrl(PROJECT_URI);

$oPage->zone("navbar")->addBlock(new \BaikalAdmin\Controller\Navigation\Topbar\Install());

if(!defined("BAIKAL_CONFIGURED_VERSION")) {
	# we have to upgrade Baïkal (existing installation)
	$oPage->zone("Payload")->addBlock(new \BaikalAdmin\Controller\Install\Initialize());
	
} elseif(!defined("BAIKAL_ADMIN_PASSWORDHASH")) {
	# we have to set an admin password
	$oPage->zone("Payload")->addBlock(new \BaikalAdmin\Controller\Install\Initialize());
} else {
	if(BAIKAL_CONFIGURED_VERSION !== BAIKAL_VERSION) {
		# we have to upgrade Baïkal
		$oPage->zone("Payload")->addBlock(new \BaikalAdmin\Controller\Install\VersionUpgrade());
	} else {
		$oPage->zone("Payload")->addBlock(new \BaikalAdmin\Controller\Install\Database());
	}
}

# Render the page
echo $oPage->render();