app/code/core/Mage/Install/Model/Installer/Filesystem.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Install
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/**
 * Fylesystem installer
 *
 * @category   Mage
 * @package    Mage_Install
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Install_Model_Installer_Filesystem extends Mage_Install_Model_Installer_Abstract
{
    const MODE_WRITE = 'write';
    const MODE_READ  = 'read';

    public function __construct()
    {
    }

    /**
     * Check and prepare file system
     *
     */
    public function install()
    {
        if (!$this->_checkFilesystem()) {
            throw new Exception();
        };
        return $this;
    }

    /**
     * Check file system by config
     *
     * @return bool
     */
    protected function _checkFilesystem()
    {
        $res = true;
        $config = Mage::getSingleton('install/config')->getPathForCheck();

        if (isset($config['writeable'])) {
            foreach ($config['writeable'] as $item) {
                $recursive = isset($item['recursive']) ? $item['recursive'] : false;
                $existence = isset($item['existence']) ? $item['existence'] : false;
                $checkRes = $this->_checkPath($item['path'], $recursive, $existence, 'write');
                $res = $res && $checkRes;
            }
        }
        return $res;
    }

    /**
     * Check file system path
     *
     * @param   string $path
     * @param   bool $recursive
     * @param   bool $existence
     * @param   string $mode
     * @return  bool
     */
    protected function _checkPath($path, $recursive, $existence, $mode)
    {
        $res = true;
        $fullPath = dirname(Mage::getRoot()).$path;
        if ($mode == self::MODE_WRITE) {
            $setError = false;
            if ($existence) {
                if ((is_dir($fullPath) && !is_dir_writeable($fullPath)) || !is_writable($fullPath)) {
                    $setError = true;
                }
            }
            else {
                if (file_exists($fullPath) && !is_writable($fullPath)) {
                    $setError = true;
                }
            }

            if ($setError) {
                $this->_getInstaller()->getDataModel()->addError(
                    Mage::helper('install')->__('Path "%s" must be writable', $fullPath)
                );
                $res = false;
            }
        }

        if ($recursive && is_dir($fullPath)) {
            foreach (new DirectoryIterator($fullPath) as $file) {
                if (!$file->isDot() && $file->getFilename() != '.svn' && $file->getFilename() != '.htaccess') {
                    $res = $res && $this->_checkPath($path.DS.$file->getFilename(), $recursive, $existence, $mode);
                }
            }
        }
        return $res;
    }
}

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