<?php

/**

 * WordPress core upgrade functionality.

 *

 * @package WordPress

 * @subpackage Administration

 * @since 2.7.0

 */

/**

 * Stores files to be deleted.

 *

 * @since 2.7.0

 * @global array $_old_files

 * @var array

 * @name $_old_files

 */

global $_old_files;

$_old_files = array(

'wp-admin/bookmarklet.php',

'wp-admin/css/upload.css',

'wp-admin/css/upload-rtl.css',

'wp-admin/css/press-this-ie.css',

'wp-admin/css/press-this-ie-rtl.css',

'wp-admin/edit-form.php',

'wp-admin/link-import.php',

'wp-admin/images/box-bg-left.gif',

'wp-admin/images/box-bg-right.gif',

'wp-admin/images/box-bg.gif',

'wp-admin/images/box-butt-left.gif',

'wp-admin/images/box-butt-right.gif',

'wp-admin/images/box-butt.gif',

'wp-admin/images/box-head-left.gif',

'wp-admin/images/box-head-right.gif',

'wp-admin/images/box-head.gif',

'wp-admin/images/heading-bg.gif',

'wp-admin/images/login-bkg-bottom.gif',

'wp-admin/images/login-bkg-tile.gif',

'wp-admin/images/notice.gif',

'wp-admin/images/toggle.gif',

'wp-admin/images/comment-stalk-classic.gif',

'wp-admin/images/comment-stalk-fresh.gif',

'wp-admin/images/comment-stalk-rtl.gif',

'wp-admin/images/comment-pill.gif',

'wp-admin/images/del.png',

'wp-admin/images/media-button-gallery.gif',

'wp-admin/images/media-buttons.gif',

'wp-admin/images/tail.gif',

'wp-admin/images/gear.png',

'wp-admin/images/tab.png',

'wp-admin/images/postbox-bg.gif',

'wp-admin/includes/upload.php',

'wp-admin/js/dbx-admin-key.js',

'wp-admin/js/link-cat.js',

'wp-admin/js/forms.js',

'wp-admin/js/upload.js',

'wp-admin/js/set-post-thumbnail-handler.js',

'wp-admin/js/set-post-thumbnail-handler.dev.js',

'wp-admin/js/page.js',

'wp-admin/js/page.dev.js',

'wp-admin/js/slug.js',

'wp-admin/js/slug.dev.js',

'wp-admin/profile-update.php',

'wp-admin/templates.php',

'wp-includes/images/audio.png',

'wp-includes/images/css.png',

'wp-includes/images/default.png',

'wp-includes/images/doc.png',

'wp-includes/images/exe.png',

'wp-includes/images/html.png',

'wp-includes/images/js.png',

'wp-includes/images/pdf.png',

'wp-includes/images/swf.png',

'wp-includes/images/tar.png',

'wp-includes/images/text.png',

'wp-includes/images/video.png',

'wp-includes/images/zip.png',

'wp-includes/js/dbx.js',

'wp-includes/js/fat.js',

'wp-includes/js/list-manipulation.js',

'wp-includes/js/jquery/jquery.dimensions.min.js',

'wp-includes/js/tinymce/langs/en.js',

'wp-includes/js/tinymce/plugins/autosave/editor_plugin_src.js',

'wp-includes/js/tinymce/plugins/autosave/langs',

'wp-includes/js/tinymce/plugins/directionality/images',

'wp-includes/js/tinymce/plugins/directionality/langs',

'wp-includes/js/tinymce/plugins/inlinepopups/css',

'wp-includes/js/tinymce/plugins/inlinepopups/images',

'wp-includes/js/tinymce/plugins/inlinepopups/jscripts',

'wp-includes/js/tinymce/plugins/paste/images',

'wp-includes/js/tinymce/plugins/paste/jscripts',

'wp-includes/js/tinymce/plugins/paste/langs',

'wp-includes/js/tinymce/plugins/spellchecker/classes/HttpClient.class.php',

'wp-includes/js/tinymce/plugins/spellchecker/classes/TinyGoogleSpell.class.php',

'wp-includes/js/tinymce/plugins/spellchecker/classes/TinyPspell.class.php',

'wp-includes/js/tinymce/plugins/spellchecker/classes/TinyPspellShell.class.php',

'wp-includes/js/tinymce/plugins/spellchecker/css/spellchecker.css',

'wp-includes/js/tinymce/plugins/spellchecker/images',

'wp-includes/js/tinymce/plugins/spellchecker/langs',

'wp-includes/js/tinymce/plugins/spellchecker/tinyspell.php',

'wp-includes/js/tinymce/plugins/wordpress/images',

'wp-includes/js/tinymce/plugins/wordpress/langs',

'wp-includes/js/tinymce/plugins/wordpress/popups.css',

'wp-includes/js/tinymce/plugins/wordpress/wordpress.css',

'wp-includes/js/tinymce/plugins/wphelp',

'wp-includes/js/tinymce/themes/advanced/css',

'wp-includes/js/tinymce/themes/advanced/images',

'wp-includes/js/tinymce/themes/advanced/jscripts',

'wp-includes/js/tinymce/themes/advanced/langs',

'wp-includes/js/tinymce/tiny_mce_gzip.php',

'wp-includes/js/wp-ajax.js',

'wp-admin/admin-db.php',

'wp-admin/cat.js',

'wp-admin/categories.js',

'wp-admin/custom-fields.js',

'wp-admin/dbx-admin-key.js',

'wp-admin/edit-comments.js',

'wp-admin/install-rtl.css',

'wp-admin/install.css',

'wp-admin/upgrade-schema.php',

'wp-admin/upload-functions.php',

'wp-admin/upload-rtl.css',

'wp-admin/upload.css',

'wp-admin/upload.js',

'wp-admin/users.js',

'wp-admin/widgets-rtl.css',

'wp-admin/widgets.css',

'wp-admin/xfn.js',

'wp-includes/js/tinymce/license.html',

'wp-admin/cat-js.php',

'wp-admin/edit-form-ajax-cat.php',

'wp-admin/execute-pings.php',

'wp-admin/import/b2.php',

'wp-admin/import/btt.php',

'wp-admin/import/jkw.php',

'wp-admin/inline-uploading.php',

'wp-admin/link-categories.php',

'wp-admin/list-manipulation.js',

'wp-admin/list-manipulation.php',

'wp-includes/comment-functions.php',

'wp-includes/feed-functions.php',

'wp-includes/functions-compat.php',

'wp-includes/functions-formatting.php',

'wp-includes/functions-post.php',

'wp-includes/js/dbx-key.js',

'wp-includes/js/tinymce/plugins/autosave/langs/cs.js',

'wp-includes/js/tinymce/plugins/autosave/langs/sv.js',

'wp-includes/js/tinymce/themes/advanced/editor_template_src.js',

'wp-includes/links.php',

'wp-includes/pluggable-functions.php',

'wp-includes/template-functions-author.php',

'wp-includes/template-functions-category.php',

'wp-includes/template-functions-general.php',

'wp-includes/template-functions-links.php',

'wp-includes/template-functions-post.php',

'wp-includes/wp-l10n.php',

'wp-admin/import-b2.php',

'wp-admin/import-blogger.php',

'wp-admin/import-greymatter.php',

'wp-admin/import-livejournal.php',

'wp-admin/import-mt.php',

'wp-admin/import-rss.php',

'wp-admin/import-textpattern.php',

'wp-admin/quicktags.js',

'wp-images/fade-butt.png',

'wp-images/get-firefox.png',

'wp-images/header-shadow.png',

'wp-images/smilies',

'wp-images/wp-small.png',

'wp-images/wpminilogo.png',

'wp.php',

'wp-includes/gettext.php',

'wp-includes/streams.php'

);

/**

 * Upgrade the core of WordPress.

 *

 * This will create a .maintenance file at the base of the WordPress directory

 * to ensure that people can not access the web site, when the files are being

 * copied to their locations.

 *

 * The files in the {@link $_old_files} list will be removed and the new files

 * copied from the zip file after the database is upgraded.

 *

 * The steps for the upgrader for after the new release is downloaded and

 * unzipped is:

 *   1. Test unzipped location for select files to ensure that unzipped worked.

 *   2. Create the .maintenance file in current WordPress base.

 *   3. Copy new WordPress directory over old WordPress files.

 *   4. Upgrade WordPress to new version.

 *   5. Delete new WordPress directory path.

 *   6. Delete .maintenance file.

 *   7. Remove old files.

 *   8. Delete 'update_core' option.

 *

 * There are several areas of failure. For instance if PHP times out before step

 * 6, then you will not be able to access any portion of your site. Also, since

 * the upgrade will not continue where it left off, you will not be able to

 * automatically remove old files and remove the 'update_core' option. This

 * isn't that bad.

 *

 * If the copy of the new WordPress over the old fails, then the worse is that

 * the new WordPress directory will remain.

 *

 * If it is assumed that every file will be copied over, including plugins and

 * themes, then if you edit the default theme, you should rename it, so that

 * your changes remain.

 *

 * @since 2.7.0

 *

 * @param string $from New release unzipped path.

 * @param string $to Path to old WordPress installation.

 * @return WP_Error|null WP_Error on failure, null on success.

 */

function update_core($from, $to) {

	global $wp_filesystem, $_old_files, $wpdb;

	@set_time_limit( 300 );

	$php_version    = phpversion();

	$mysql_version  = $wpdb->db_version();

	$required_php_version = '4.3';

	$required_mysql_version = '4.1.2';

	$wp_version = '2.9.1';

	$php_compat     = version_compare( $php_version, $required_php_version, '>=' );

	$mysql_compat   = version_compare( $mysql_version, $required_mysql_version, '>=' ) || file_exists( WP_CONTENT_DIR . '/db.php' );

	if ( !$mysql_compat || !$php_compat )

		$wp_filesystem->delete($from, true);

	if ( !$mysql_compat && !$php_compat )

		return new WP_Error( 'php_mysql_not_compatible', sprintf( __('The update cannot be installed because WordPress %1$s requires PHP version %2$s or higher and MySQL version %3$s or higher. You are running PHP version %4$s and MySQL version %5$s.'), $wp_version, $required_php_version, $required_mysql_version, $php_version, $mysql_version ) );

	elseif ( !$php_compat )

		return new WP_Error( 'php_not_compatible', sprintf( __('The update cannot be installed because WordPress %1$s requires PHP version %2$s or higher. You are running version %3$s.'), $wp_version, $required_php_version, $php_version ) );

	elseif ( !$mysql_compat )

		return new WP_Error( 'mysql_not_compatible', sprintf( __('The update cannot be installed because WordPress %1$s requires MySQL version %2$s or higher. You are running version %3$s.'), $wp_version, $required_mysql_version, $mysql_version ) );

	// Sanity check the unzipped distribution

	apply_filters('update_feedback', __('Verifying the unpacked files'));

	if ( !$wp_filesystem->exists($from . '/wordpress/wp-settings.php') || !$wp_filesystem->exists($from . '/wordpress/wp-admin/admin.php') ||

		!$wp_filesystem->exists($from . '/wordpress/wp-includes/functions.php') ) {

		$wp_filesystem->delete($from, true);

		return new WP_Error('insane_distro', __('The update could not be unpacked') );

	}

	apply_filters('update_feedback', __('Installing the latest version'));

	// Create maintenance file to signal that we are upgrading

	$maintenance_string = '<?php $upgrading = ' . time() . '; ?>';

	$maintenance_file = $to . '.maintenance';

	$wp_filesystem->delete($maintenance_file);

	$wp_filesystem->put_contents($maintenance_file, $maintenance_string, FS_CHMOD_FILE);

	// Copy new versions of WP files into place.

	$result = copy_dir($from . '/wordpress', $to);

	if ( is_wp_error($result) ) {

		$wp_filesystem->delete($maintenance_file);

		$wp_filesystem->delete($from, true);

		return $result;

	}

	// Remove old files

	foreach ( $_old_files as $old_file ) {

		$old_file = $to . $old_file;

		if ( !$wp_filesystem->exists($old_file) )

			continue;

		$wp_filesystem->delete($old_file, true);

	}

	// Upgrade DB with separate request

	apply_filters('update_feedback', __('Upgrading database'));

	$db_upgrade_url = admin_url('upgrade.php?step=upgrade_db');

	wp_remote_post($db_upgrade_url, array('timeout' => 60));

	// Remove working directory

	$wp_filesystem->delete($from, true);

	// Force refresh of update information

	if ( function_exists('delete_transient') )

		delete_transient('update_core');

	else

		delete_option('update_core');

	// Remove maintenance file, we're done.

	$wp_filesystem->delete($maintenance_file);

}

?>