Automatic upgrade, first cut. see #5560

git-svn-id: http://svn.automattic.com/wordpress/trunk@8595 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/update-core.php

@@ -0,0 +1,50 @@
+<?php
+
+function update_core($from, $to) {
+	global $wp_filesystem;
+
+	// Sanity check the unzipped distribution
+	apply_filters('update_feedback', __('Verifying the unpacked files'));
+	if ( !file_exists($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);
+
+	// Force refresh of update information
+	delete_option('update_core');
+}
+
+?>