WordPress/wp-admin/includes/update-core.php

<?php

global $_old_files;

$_old_files = array(
'wp-admin/bookmarklet.php',
'wp-admin/css/upload.css',
'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/includes/upload.php',
'wp-admin/js/dbx-admin-key.js',
'wp-admin/js/link-cat.js',
'wp-admin/profile-update.php',
'wp-admin/templates.php',
'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/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',
'wp.php',
'wp-content/themes/default/attachment.php',
'wp-content/themes/default/images/kubrickbg.jpg',
'wp-content/plugins/markdown.php',
'wp-content/plugins/textile1.php',
);

function update_core($from, $to) {
	global $wp_filesystem, $_old_files;

	// Sanity check the unzipped distribution
	apply_filters('update_feedback', __('Verifying the unpacked files'));
	if ( !file_exists($from . '/wordpress/wp-settings.php') || !file_exists($from . '/wordpress/wp-admin/admin.php') ||
		!file_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, 0644);

	// Copy new versions of WP files into place.
	$result = copy_dir($from . '/wordpress', $to);
	if ( is_wp_error($result) ) {
		$wp_filesystem->delete($maintenance_file);
		//$wp_filesystem->delete($working_dir, true); //TODO: Uncomment? This DOES mean that the new files are available in the upgrade folder if it fails.
		return $result;
	}

	// Might have to do upgrade in a separate step.
	apply_filters('update_feedback', __('Upgrading database'));
	// Get new db version
	global $wp_db_version;
	require (ABSPATH . WPINC . '/version.php');
	// Upgrade db
	define('WP_INSTALLING', true);
	require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
	wp_upgrade();

	// Remove working directory
	$wp_filesystem->delete($from, true);

	// Remove maintenance file, we're done.
	$wp_filesystem->delete($maintenance_file);

	// Remove old files
	foreach ( $_old_files as $old_file ) {
		$old_file = $to . $old_file;
		if ( !file_exists($old_file) )
			continue;
		$wp_filesystem->delete($old_file, true);
	}

	// Force refresh of update information
	delete_option('update_core');
}

?>