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/PHPServer/wordpress/wp-admin/includes/update-core.php

https://bitbucket.org/jsvana/alfred
PHP | 711 lines | 521 code | 43 blank | 147 comment | 53 complexity | b2afd90077712fa87809de5a02926267 MD5 | raw file
  1<?php
  2/**
  3 * WordPress core upgrade functionality.
  4 *
  5 * @package WordPress
  6 * @subpackage Administration
  7 * @since 2.7.0
  8 */
  9
 10/**
 11 * Stores files to be deleted.
 12 *
 13 * @since 2.7.0
 14 * @global array $_old_files
 15 * @var array
 16 * @name $_old_files
 17 */
 18global $_old_files;
 19
 20$_old_files = array(
 21// 2.0
 22'wp-admin/import-b2.php',
 23'wp-admin/import-blogger.php',
 24'wp-admin/import-greymatter.php',
 25'wp-admin/import-livejournal.php',
 26'wp-admin/import-mt.php',
 27'wp-admin/import-rss.php',
 28'wp-admin/import-textpattern.php',
 29'wp-admin/quicktags.js',
 30'wp-images/fade-butt.png',
 31'wp-images/get-firefox.png',
 32'wp-images/header-shadow.png',
 33'wp-images/smilies',
 34'wp-images/wp-small.png',
 35'wp-images/wpminilogo.png',
 36'wp.php',
 37// 2.0.8
 38'wp-includes/js/tinymce/plugins/inlinepopups/readme.txt',
 39// 2.1
 40'wp-admin/edit-form-ajax-cat.php',
 41'wp-admin/execute-pings.php',
 42'wp-admin/inline-uploading.php',
 43'wp-admin/link-categories.php',
 44'wp-admin/list-manipulation.js',
 45'wp-admin/list-manipulation.php',
 46'wp-includes/comment-functions.php',
 47'wp-includes/feed-functions.php',
 48'wp-includes/functions-compat.php',
 49'wp-includes/functions-formatting.php',
 50'wp-includes/functions-post.php',
 51'wp-includes/js/dbx-key.js',
 52'wp-includes/js/tinymce/plugins/autosave/langs/cs.js',
 53'wp-includes/js/tinymce/plugins/autosave/langs/sv.js',
 54'wp-includes/links.php',
 55'wp-includes/pluggable-functions.php',
 56'wp-includes/template-functions-author.php',
 57'wp-includes/template-functions-category.php',
 58'wp-includes/template-functions-general.php',
 59'wp-includes/template-functions-links.php',
 60'wp-includes/template-functions-post.php',
 61'wp-includes/wp-l10n.php',
 62// 2.2
 63'wp-admin/cat-js.php',
 64'wp-admin/import/b2.php',
 65'wp-includes/js/autosave-js.php',
 66'wp-includes/js/list-manipulation-js.php',
 67'wp-includes/js/wp-ajax-js.php',
 68// 2.3
 69'wp-admin/admin-db.php',
 70'wp-admin/cat.js',
 71'wp-admin/categories.js',
 72'wp-admin/custom-fields.js',
 73'wp-admin/dbx-admin-key.js',
 74'wp-admin/edit-comments.js',
 75'wp-admin/install-rtl.css',
 76'wp-admin/install.css',
 77'wp-admin/upgrade-schema.php',
 78'wp-admin/upload-functions.php',
 79'wp-admin/upload-rtl.css',
 80'wp-admin/upload.css',
 81'wp-admin/upload.js',
 82'wp-admin/users.js',
 83'wp-admin/widgets-rtl.css',
 84'wp-admin/widgets.css',
 85'wp-admin/xfn.js',
 86'wp-includes/js/tinymce/license.html',
 87// 2.5
 88'wp-admin/css/upload.css',
 89'wp-admin/images/box-bg-left.gif',
 90'wp-admin/images/box-bg-right.gif',
 91'wp-admin/images/box-bg.gif',
 92'wp-admin/images/box-butt-left.gif',
 93'wp-admin/images/box-butt-right.gif',
 94'wp-admin/images/box-butt.gif',
 95'wp-admin/images/box-head-left.gif',
 96'wp-admin/images/box-head-right.gif',
 97'wp-admin/images/box-head.gif',
 98'wp-admin/images/heading-bg.gif',
 99'wp-admin/images/login-bkg-bottom.gif',
100'wp-admin/images/login-bkg-tile.gif',
101'wp-admin/images/notice.gif',
102'wp-admin/images/toggle.gif',
103'wp-admin/includes/upload.php',
104'wp-admin/js/dbx-admin-key.js',
105'wp-admin/js/link-cat.js',
106'wp-admin/profile-update.php',
107'wp-admin/templates.php',
108'wp-includes/images/wlw/WpComments.png',
109'wp-includes/images/wlw/WpIcon.png',
110'wp-includes/images/wlw/WpWatermark.png',
111'wp-includes/js/dbx.js',
112'wp-includes/js/fat.js',
113'wp-includes/js/list-manipulation.js',
114'wp-includes/js/tinymce/langs/en.js',
115'wp-includes/js/tinymce/plugins/autosave/editor_plugin_src.js',
116'wp-includes/js/tinymce/plugins/autosave/langs',
117'wp-includes/js/tinymce/plugins/directionality/images',
118'wp-includes/js/tinymce/plugins/directionality/langs',
119'wp-includes/js/tinymce/plugins/inlinepopups/css',
120'wp-includes/js/tinymce/plugins/inlinepopups/images',
121'wp-includes/js/tinymce/plugins/inlinepopups/jscripts',
122'wp-includes/js/tinymce/plugins/paste/images',
123'wp-includes/js/tinymce/plugins/paste/jscripts',
124'wp-includes/js/tinymce/plugins/paste/langs',
125'wp-includes/js/tinymce/plugins/spellchecker/classes/HttpClient.class.php',
126'wp-includes/js/tinymce/plugins/spellchecker/classes/TinyGoogleSpell.class.php',
127'wp-includes/js/tinymce/plugins/spellchecker/classes/TinyPspell.class.php',
128'wp-includes/js/tinymce/plugins/spellchecker/classes/TinyPspellShell.class.php',
129'wp-includes/js/tinymce/plugins/spellchecker/css/spellchecker.css',
130'wp-includes/js/tinymce/plugins/spellchecker/images',
131'wp-includes/js/tinymce/plugins/spellchecker/langs',
132'wp-includes/js/tinymce/plugins/spellchecker/tinyspell.php',
133'wp-includes/js/tinymce/plugins/wordpress/images',
134'wp-includes/js/tinymce/plugins/wordpress/langs',
135'wp-includes/js/tinymce/plugins/wordpress/wordpress.css',
136'wp-includes/js/tinymce/plugins/wphelp',
137'wp-includes/js/tinymce/themes/advanced/css',
138'wp-includes/js/tinymce/themes/advanced/images',
139'wp-includes/js/tinymce/themes/advanced/jscripts',
140'wp-includes/js/tinymce/themes/advanced/langs',
141// 2.5.1
142'wp-includes/js/tinymce/tiny_mce_gzip.php',
143// 2.6
144'wp-admin/bookmarklet.php',
145'wp-includes/js/jquery/jquery.dimensions.min.js',
146'wp-includes/js/tinymce/plugins/wordpress/popups.css',
147'wp-includes/js/wp-ajax.js',
148// 2.7
149'wp-admin/css/press-this-ie-rtl.css',
150'wp-admin/css/press-this-ie.css',
151'wp-admin/css/upload-rtl.css',
152'wp-admin/edit-form.php',
153'wp-admin/images/comment-pill.gif',
154'wp-admin/images/comment-stalk-classic.gif',
155'wp-admin/images/comment-stalk-fresh.gif',
156'wp-admin/images/comment-stalk-rtl.gif',
157'wp-admin/images/del.png',
158'wp-admin/images/gear.png',
159'wp-admin/images/media-button-gallery.gif',
160'wp-admin/images/media-buttons.gif',
161'wp-admin/images/postbox-bg.gif',
162'wp-admin/images/tab.png',
163'wp-admin/images/tail.gif',
164'wp-admin/js/forms.js',
165'wp-admin/js/upload.js',
166'wp-admin/link-import.php',
167'wp-includes/images/audio.png',
168'wp-includes/images/css.png',
169'wp-includes/images/default.png',
170'wp-includes/images/doc.png',
171'wp-includes/images/exe.png',
172'wp-includes/images/html.png',
173'wp-includes/images/js.png',
174'wp-includes/images/pdf.png',
175'wp-includes/images/swf.png',
176'wp-includes/images/tar.png',
177'wp-includes/images/text.png',
178'wp-includes/images/video.png',
179'wp-includes/images/zip.png',
180'wp-includes/js/tinymce/tiny_mce_config.php',
181'wp-includes/js/tinymce/tiny_mce_ext.js',
182// 2.8
183'wp-admin/js/users.js',
184'wp-includes/js/swfupload/plugins/swfupload.documentready.js',
185'wp-includes/js/swfupload/plugins/swfupload.graceful_degradation.js',
186'wp-includes/js/swfupload/swfupload_f9.swf',
187'wp-includes/js/tinymce/plugins/autosave',
188'wp-includes/js/tinymce/plugins/paste/css',
189'wp-includes/js/tinymce/utils/mclayer.js',
190'wp-includes/js/tinymce/wordpress.css',
191// 2.8.5
192'wp-admin/import/btt.php',
193'wp-admin/import/jkw.php',
194// 2.9
195'wp-admin/js/page.dev.js',
196'wp-admin/js/page.js',
197'wp-admin/js/set-post-thumbnail-handler.dev.js',
198'wp-admin/js/set-post-thumbnail-handler.js',
199'wp-admin/js/slug.dev.js',
200'wp-admin/js/slug.js',
201'wp-includes/gettext.php',
202'wp-includes/js/tinymce/plugins/wordpress/js',
203'wp-includes/streams.php',
204// MU
205'README.txt',
206'htaccess.dist',
207'index-install.php',
208'wp-admin/css/mu-rtl.css',
209'wp-admin/css/mu.css',
210'wp-admin/images/site-admin.png',
211'wp-admin/includes/mu.php',
212'wp-admin/wpmu-admin.php',
213'wp-admin/wpmu-blogs.php',
214'wp-admin/wpmu-edit.php',
215'wp-admin/wpmu-options.php',
216'wp-admin/wpmu-themes.php',
217'wp-admin/wpmu-upgrade-site.php',
218'wp-admin/wpmu-users.php',
219'wp-includes/images/wordpress-mu.png',
220'wp-includes/wpmu-default-filters.php',
221'wp-includes/wpmu-functions.php',
222'wpmu-settings.php',
223// 3.0
224'wp-admin/categories.php',
225'wp-admin/edit-category-form.php',
226'wp-admin/edit-page-form.php',
227'wp-admin/edit-pages.php',
228'wp-admin/images/admin-header-footer.png',
229'wp-admin/images/browse-happy.gif',
230'wp-admin/images/ico-add.png',
231'wp-admin/images/ico-close.png',
232'wp-admin/images/ico-edit.png',
233'wp-admin/images/ico-viewpage.png',
234'wp-admin/images/fav-top.png',
235'wp-admin/images/screen-options-left.gif',
236'wp-admin/images/wp-logo-vs.gif',
237'wp-admin/images/wp-logo.gif',
238'wp-admin/import',
239'wp-admin/js/wp-gears.dev.js',
240'wp-admin/js/wp-gears.js',
241'wp-admin/options-misc.php',
242'wp-admin/page-new.php',
243'wp-admin/page.php',
244'wp-admin/rtl.css',
245'wp-admin/rtl.dev.css',
246'wp-admin/update-links.php',
247'wp-admin/wp-admin.css',
248'wp-admin/wp-admin.dev.css',
249'wp-includes/js/codepress',
250'wp-includes/js/codepress/engines/khtml.js',
251'wp-includes/js/codepress/engines/older.js',
252'wp-includes/js/jquery/autocomplete.dev.js',
253'wp-includes/js/jquery/autocomplete.js',
254'wp-includes/js/jquery/interface.js',
255'wp-includes/js/scriptaculous/prototype.js',
256'wp-includes/js/tinymce/wp-tinymce.js',
257// 3.1
258'wp-admin/edit-attachment-rows.php',
259'wp-admin/edit-link-categories.php',
260'wp-admin/edit-link-category-form.php',
261'wp-admin/edit-post-rows.php',
262'wp-admin/images/button-grad-active-vs.png',
263'wp-admin/images/button-grad-vs.png',
264'wp-admin/images/fav-arrow-vs-rtl.gif',
265'wp-admin/images/fav-arrow-vs.gif',
266'wp-admin/images/fav-top-vs.gif',
267'wp-admin/images/list-vs.png',
268'wp-admin/images/screen-options-right-up.gif',
269'wp-admin/images/screen-options-right.gif',
270'wp-admin/images/visit-site-button-grad-vs.gif',
271'wp-admin/images/visit-site-button-grad.gif',
272'wp-admin/link-category.php',
273'wp-admin/sidebar.php',
274'wp-includes/classes.php',
275'wp-includes/js/tinymce/blank.htm',
276'wp-includes/js/tinymce/plugins/media/css/content.css',
277'wp-includes/js/tinymce/plugins/media/img',
278'wp-includes/js/tinymce/plugins/safari',
279// 3.2
280'wp-admin/images/logo-login.gif',
281'wp-admin/images/star.gif',
282'wp-admin/js/list-table.dev.js',
283'wp-admin/js/list-table.js',
284'wp-includes/default-embeds.php',
285'wp-includes/js/tinymce/plugins/wordpress/img/help.gif',
286'wp-includes/js/tinymce/plugins/wordpress/img/more.gif',
287'wp-includes/js/tinymce/plugins/wordpress/img/toolbars.gif',
288'wp-includes/js/tinymce/themes/advanced/img/fm.gif',
289'wp-includes/js/tinymce/themes/advanced/img/sflogo.png',
290// 3.3
291'wp-admin/css/colors-classic-rtl.css',
292'wp-admin/css/colors-classic-rtl.dev.css',
293'wp-admin/css/colors-fresh-rtl.css',
294'wp-admin/css/colors-fresh-rtl.dev.css',
295'wp-admin/css/dashboard-rtl.css',
296'wp-admin/css/dashboard-rtl.dev.css',
297'wp-admin/css/dashboard.css',
298'wp-admin/css/dashboard.dev.css',
299'wp-admin/css/farbtastic-rtl.css',
300'wp-admin/css/global-rtl.css',
301'wp-admin/css/global-rtl.dev.css',
302'wp-admin/css/global.css',
303'wp-admin/css/global.dev.css',
304'wp-admin/css/install-rtl.css',
305'wp-admin/css/install-rtl.dev.css',
306'wp-admin/css/login-rtl.css',
307'wp-admin/css/login-rtl.dev.css',
308'wp-admin/css/login.css',
309'wp-admin/css/login.dev.css',
310'wp-admin/css/ms.css',
311'wp-admin/css/ms.dev.css',
312'wp-admin/css/nav-menu-rtl.css',
313'wp-admin/css/nav-menu-rtl.dev.css',
314'wp-admin/css/nav-menu.css',
315'wp-admin/css/nav-menu.dev.css',
316'wp-admin/css/plugin-install-rtl.css',
317'wp-admin/css/plugin-install-rtl.dev.css',
318'wp-admin/css/plugin-install.css',
319'wp-admin/css/plugin-install.dev.css',
320'wp-admin/css/press-this-rtl.css',
321'wp-admin/css/press-this-rtl.dev.css',
322'wp-admin/css/press-this.css',
323'wp-admin/css/press-this.dev.css',
324'wp-admin/css/theme-editor-rtl.css',
325'wp-admin/css/theme-editor-rtl.dev.css',
326'wp-admin/css/theme-editor.css',
327'wp-admin/css/theme-editor.dev.css',
328'wp-admin/css/theme-install-rtl.css',
329'wp-admin/css/theme-install-rtl.dev.css',
330'wp-admin/css/theme-install.css',
331'wp-admin/css/theme-install.dev.css',
332'wp-admin/css/widgets-rtl.css',
333'wp-admin/css/widgets-rtl.dev.css',
334'wp-admin/css/widgets.css',
335'wp-admin/css/widgets.dev.css',
336'wp-admin/includes/internal-linking.php',
337'wp-includes/images/admin-bar-sprite-rtl.png',
338'wp-includes/js/jquery/ui.button.js',
339'wp-includes/js/jquery/ui.core.js',
340'wp-includes/js/jquery/ui.dialog.js',
341'wp-includes/js/jquery/ui.draggable.js',
342'wp-includes/js/jquery/ui.droppable.js',
343'wp-includes/js/jquery/ui.mouse.js',
344'wp-includes/js/jquery/ui.position.js',
345'wp-includes/js/jquery/ui.resizable.js',
346'wp-includes/js/jquery/ui.selectable.js',
347'wp-includes/js/jquery/ui.sortable.js',
348'wp-includes/js/jquery/ui.tabs.js',
349'wp-includes/js/jquery/ui.widget.js',
350'wp-includes/js/l10n.dev.js',
351'wp-includes/js/l10n.js',
352'wp-includes/js/tinymce/plugins/wplink/css',
353'wp-includes/js/tinymce/plugins/wplink/img',
354'wp-includes/js/tinymce/plugins/wplink/js',
355'wp-includes/js/tinymce/themes/advanced/img/wpicons.png',
356'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/butt2.png',
357'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/button_bg.png',
358'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/down_arrow.gif',
359'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/fade-butt.png',
360'wp-includes/js/tinymce/themes/advanced/skins/wp_theme/img/separator.gif',
361// Don't delete, yet: 'wp-rss.php',
362// Don't delete, yet: 'wp-rdf.php',
363// Don't delete, yet: 'wp-rss2.php',
364// Don't delete, yet: 'wp-commentsrss2.php',
365// Don't delete, yet: 'wp-atom.php',
366// Don't delete, yet: 'wp-feed.php',
367// 3.4
368'wp-admin/images/gray-star.png',
369'wp-admin/images/logo-login.png',
370'wp-admin/images/star.png',
371'wp-admin/index-extra.php',
372'wp-admin/network/index-extra.php',
373'wp-admin/user/index-extra.php',
374'wp-admin/images/screenshots/admin-flyouts.png',
375'wp-admin/images/screenshots/coediting.png',
376'wp-admin/images/screenshots/drag-and-drop.png',
377'wp-admin/images/screenshots/help-screen.png',
378'wp-admin/images/screenshots/media-icon.png',
379'wp-admin/images/screenshots/new-feature-pointer.png',
380'wp-admin/images/screenshots/welcome-screen.png',
381'wp-includes/css/editor-buttons.css',
382'wp-includes/css/editor-buttons.dev.css',
383'wp-includes/js/tinymce/plugins/paste/blank.htm',
384'wp-includes/js/tinymce/plugins/wordpress/css',
385'wp-includes/js/tinymce/plugins/wordpress/editor_plugin.dev.js',
386'wp-includes/js/tinymce/plugins/wordpress/img/embedded.png',
387'wp-includes/js/tinymce/plugins/wordpress/img/more_bug.gif',
388'wp-includes/js/tinymce/plugins/wordpress/img/page_bug.gif',
389'wp-includes/js/tinymce/plugins/wpdialogs/editor_plugin.dev.js',
390'wp-includes/js/tinymce/plugins/wpeditimage/css/editimage-rtl.css',
391'wp-includes/js/tinymce/plugins/wpeditimage/editor_plugin.dev.js',
392'wp-includes/js/tinymce/plugins/wpfullscreen/editor_plugin.dev.js',
393'wp-includes/js/tinymce/plugins/wpgallery/editor_plugin.dev.js',
394'wp-includes/js/tinymce/plugins/wpgallery/img/gallery.png',
395'wp-includes/js/tinymce/plugins/wplink/editor_plugin.dev.js',
396// Don't delete, yet: 'wp-pass.php',
397// Don't delete, yet: 'wp-register.php',
398);
399
400/**
401 * Stores new files in wp-content to copy
402 *
403 * The contents of this array indicate any new bundled plugins/themes which
404 * should be installed with the WordPress Upgrade. These items will not be
405 * re-installed in future upgrades, this behaviour is controlled by the
406 * introduced version present here being older than the current installed version.
407 *
408 * The content of this array should follow the following format:
409 * Filename (relative to wp-content) => Introduced version
410 * Directories should be noted by suffixing it with a trailing slash (/)
411 *
412 * @since 3.2.0
413 * @global array $_new_bundled_files
414 * @var array
415 * @name $_new_bundled_files
416 */
417global $_new_bundled_files;
418
419$_new_bundled_files = array(
420'plugins/akismet/' => '2.0',
421'themes/twentyten/' => '3.0',
422'themes/twentyeleven/' => '3.2'
423);
424
425/**
426 * Upgrade the core of WordPress.
427 *
428 * This will create a .maintenance file at the base of the WordPress directory
429 * to ensure that people can not access the web site, when the files are being
430 * copied to their locations.
431 *
432 * The files in the {@link $_old_files} list will be removed and the new files
433 * copied from the zip file after the database is upgraded.
434 *
435 * The files in the {@link $_new_bundled_files} list will be added to the installation
436 * if the version is greater than or equal to the old version being upgraded.
437 *
438 * The steps for the upgrader for after the new release is downloaded and
439 * unzipped is:
440 *   1. Test unzipped location for select files to ensure that unzipped worked.
441 *   2. Create the .maintenance file in current WordPress base.
442 *   3. Copy new WordPress directory over old WordPress files.
443 *   4. Upgrade WordPress to new version.
444 *     4.1. Copy all files/folders other than wp-content
445 *     4.2. Copy any language files to WP_LANG_DIR (which may differ from WP_CONTENT_DIR
446 *     4.3. Copy any new bundled themes/plugins to their respective locations
447 *   5. Delete new WordPress directory path.
448 *   6. Delete .maintenance file.
449 *   7. Remove old files.
450 *   8. Delete 'update_core' option.
451 *
452 * There are several areas of failure. For instance if PHP times out before step
453 * 6, then you will not be able to access any portion of your site. Also, since
454 * the upgrade will not continue where it left off, you will not be able to
455 * automatically remove old files and remove the 'update_core' option. This
456 * isn't that bad.
457 *
458 * If the copy of the new WordPress over the old fails, then the worse is that
459 * the new WordPress directory will remain.
460 *
461 * If it is assumed that every file will be copied over, including plugins and
462 * themes, then if you edit the default theme, you should rename it, so that
463 * your changes remain.
464 *
465 * @since 2.7.0
466 *
467 * @param string $from New release unzipped path.
468 * @param string $to Path to old WordPress installation.
469 * @return WP_Error|null WP_Error on failure, null on success.
470 */
471function update_core($from, $to) {
472	global $wp_filesystem, $_old_files, $_new_bundled_files, $wpdb;
473
474	@set_time_limit( 300 );
475
476	$php_version    = phpversion();
477	$mysql_version  = $wpdb->db_version();
478	$required_php_version = '5.2.4';
479	$required_mysql_version = '5.0';
480	$wp_version = '3.4';
481	$php_compat     = version_compare( $php_version, $required_php_version, '>=' );
482	if ( file_exists( WP_CONTENT_DIR . '/db.php' ) && empty( $wpdb->is_mysql ) )
483		$mysql_compat = true;
484	else
485		$mysql_compat = version_compare( $mysql_version, $required_mysql_version, '>=' );
486
487	if ( !$mysql_compat || !$php_compat )
488		$wp_filesystem->delete($from, true);
489
490	if ( !$mysql_compat && !$php_compat )
491		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, $mysql_version ) );
492	elseif ( !$php_compat )
493		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, $php_version ) );
494	elseif ( !$mysql_compat )
495		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 ) );
496
497	// Sanity check the unzipped distribution
498	apply_filters('update_feedback', __('Verifying the unpacked files&#8230;'));
499	$distro = '';
500	$roots = array( '/wordpress/', '/wordpress-mu/' );
501	foreach( $roots as $root ) {
502		if ( $wp_filesystem->exists($from . $root . 'readme.html') && $wp_filesystem->exists($from . $root . 'wp-includes/version.php') ) {
503			$distro = $root;
504			break;
505		}
506	}
507	if ( !$distro ) {
508		$wp_filesystem->delete($from, true);
509		return new WP_Error('insane_distro', __('The update could not be unpacked') );
510	}
511
512	apply_filters('update_feedback', __('Installing the latest version&#8230;'));
513
514	// Create maintenance file to signal that we are upgrading
515	$maintenance_string = '<?php $upgrading = ' . time() . '; ?>';
516	$maintenance_file = $to . '.maintenance';
517	$wp_filesystem->delete($maintenance_file);
518	$wp_filesystem->put_contents($maintenance_file, $maintenance_string, FS_CHMOD_FILE);
519
520	// Copy new versions of WP files into place.
521	$result = _copy_dir($from . $distro, $to, array('wp-content') );
522
523	// Custom Content Directory needs updating now.
524	// Copy Languages
525	if ( !is_wp_error($result) && $wp_filesystem->is_dir($from . $distro . 'wp-content/languages') ) {
526		if ( WP_LANG_DIR != ABSPATH . WPINC . '/languages' || @is_dir(WP_LANG_DIR) )
527			$lang_dir = WP_LANG_DIR;
528		else
529			$lang_dir = WP_CONTENT_DIR . '/languages';
530
531		if ( !@is_dir($lang_dir) && 0 === strpos($lang_dir, ABSPATH) ) { // Check the language directory exists first
532			$wp_filesystem->mkdir($to . str_replace(ABSPATH, '', $lang_dir), FS_CHMOD_DIR); // If it's within the ABSPATH we can handle it here, otherwise they're out of luck.
533			clearstatcache(); // for FTP, Need to clear the stat cache
534		}
535
536		if ( @is_dir($lang_dir) ) {
537			$wp_lang_dir = $wp_filesystem->find_folder($lang_dir);
538			if ( $wp_lang_dir )
539				$result = copy_dir($from . $distro . 'wp-content/languages/', $wp_lang_dir);
540		}
541	}
542
543	// Copy New bundled plugins & themes
544	// This gives us the ability to install new plugins & themes bundled with future versions of WordPress whilst avoiding the re-install upon upgrade issue.
545	if ( !is_wp_error($result) && ( ! defined('CORE_UPGRADE_SKIP_NEW_BUNDLED') || ! CORE_UPGRADE_SKIP_NEW_BUNDLED ) ) {
546		$old_version = $GLOBALS['wp_version']; // $wp_version in local scope == new version
547		foreach ( (array) $_new_bundled_files as $file => $introduced_version ) {
548			// If $introduced version is greater than what the site was previously running
549			if ( version_compare($introduced_version, $old_version, '>') ) {
550				$directory = ('/' == $file[ strlen($file)-1 ]);
551				list($type, $filename) = explode('/', $file, 2);
552
553				if ( 'plugins' == $type )
554					$dest = $wp_filesystem->wp_plugins_dir();
555				elseif ( 'themes' == $type )
556					$dest = trailingslashit($wp_filesystem->wp_themes_dir()); // Back-compat, ::wp_themes_dir() did not return trailingslash'd pre-3.2
557				else
558					continue;
559
560				if ( ! $directory ) {
561					if ( $wp_filesystem->exists($dest . $filename) )
562						continue;
563
564					if ( ! $wp_filesystem->copy($from . $distro . 'wp-content/' . $file, $dest . $filename, FS_CHMOD_FILE) )
565						$result = new WP_Error('copy_failed', __('Could not copy file.'), $dest . $filename);
566				} else {
567					if ( $wp_filesystem->is_dir($dest . $filename) )
568						continue;
569
570					$wp_filesystem->mkdir($dest . $filename, FS_CHMOD_DIR);
571					$_result = copy_dir( $from . $distro . 'wp-content/' . $file, $dest . $filename);
572					if ( is_wp_error($_result) ) //If a error occurs partway through this final step, keep the error flowing through, but keep process going.
573						$result = $_result;
574				}
575			}
576		} //end foreach
577	}
578
579	// Handle $result error from the above blocks
580	if ( is_wp_error($result) ) {
581		$wp_filesystem->delete($maintenance_file);
582		$wp_filesystem->delete($from, true);
583		return $result;
584	}
585
586	// Remove old files
587	foreach ( $_old_files as $old_file ) {
588		$old_file = $to . $old_file;
589		if ( !$wp_filesystem->exists($old_file) )
590			continue;
591		$wp_filesystem->delete($old_file, true);
592	}
593
594	// Upgrade DB with separate request
595	apply_filters('update_feedback', __('Upgrading database&#8230;'));
596	$db_upgrade_url = admin_url('upgrade.php?step=upgrade_db');
597	wp_remote_post($db_upgrade_url, array('timeout' => 60));
598
599	// Remove working directory
600	$wp_filesystem->delete($from, true);
601
602	// Force refresh of update information
603	if ( function_exists('delete_site_transient') )
604		delete_site_transient('update_core');
605	else
606		delete_option('update_core');
607
608	// Remove maintenance file, we're done.
609	$wp_filesystem->delete($maintenance_file);
610
611	// If we made it this far:
612	do_action( '_core_updated_successfully', $wp_version );
613
614	return $wp_version;
615}
616
617/**
618 * Copies a directory from one location to another via the WordPress Filesystem Abstraction.
619 * Assumes that WP_Filesystem() has already been called and setup.
620 *
621 * This is a temporary function for the 3.1 -> 3.2 upgrade only and will be removed in 3.3
622 *
623 * @ignore
624 * @since 3.2.0
625 * @see copy_dir()
626 *
627 * @param string $from source directory
628 * @param string $to destination directory
629 * @param array $skip_list a list of files/folders to skip copying
630 * @return mixed WP_Error on failure, True on success.
631 */
632function _copy_dir($from, $to, $skip_list = array() ) {
633	global $wp_filesystem;
634
635	$dirlist = $wp_filesystem->dirlist($from);
636
637	$from = trailingslashit($from);
638	$to = trailingslashit($to);
639
640	$skip_regex = '';
641	foreach ( (array)$skip_list as $key => $skip_file )
642		$skip_regex .= preg_quote($skip_file, '!') . '|';
643
644	if ( !empty($skip_regex) )
645		$skip_regex = '!(' . rtrim($skip_regex, '|') . ')$!i';
646
647	foreach ( (array) $dirlist as $filename => $fileinfo ) {
648		if ( !empty($skip_regex) )
649			if ( preg_match($skip_regex, $from . $filename) )
650				continue;
651
652		if ( 'f' == $fileinfo['type'] ) {
653			if ( ! $wp_filesystem->copy($from . $filename, $to . $filename, true, FS_CHMOD_FILE) ) {
654				// If copy failed, chmod file to 0644 and try again.
655				$wp_filesystem->chmod($to . $filename, 0644);
656				if ( ! $wp_filesystem->copy($from . $filename, $to . $filename, true, FS_CHMOD_FILE) )
657					return new WP_Error('copy_failed', __('Could not copy file.'), $to . $filename);
658			}
659		} elseif ( 'd' == $fileinfo['type'] ) {
660			if ( !$wp_filesystem->is_dir($to . $filename) ) {
661				if ( !$wp_filesystem->mkdir($to . $filename, FS_CHMOD_DIR) )
662					return new WP_Error('mkdir_failed', __('Could not create directory.'), $to . $filename);
663			}
664			$result = _copy_dir($from . $filename, $to . $filename, $skip_list);
665			if ( is_wp_error($result) )
666				return $result;
667		}
668	}
669	return true;
670}
671
672/**
673 * Redirect to the About WordPress page after a successful upgrade.
674 *
675 * This function is only needed when the existing install is older than 3.4.0.
676 *
677 * @since 3.3.0
678 *
679 */
680function _redirect_to_about_wordpress( $new_version ) {
681	global $wp_version, $pagenow, $action;
682
683	if ( version_compare( $wp_version, '3.4-RC1', '>=' ) )
684		return;
685
686	// Ensure we only run this on the update-core.php page. wp_update_core() could be called in other contexts.
687	if ( 'update-core.php' != $pagenow )
688		return;
689
690 	if ( 'do-core-upgrade' != $action && 'do-core-reinstall' != $action )
691 		return;
692
693	// Load the updated default text localization domain for new strings
694	load_default_textdomain();
695
696	// See do_core_upgrade()
697	show_message( __('WordPress updated successfully') );
698	show_message( '<span class="hide-if-no-js">' . sprintf( __( 'Welcome to WordPress %1$s. You will be redirected to the About WordPress screen. If not, click <a href="%s">here</a>.' ), $new_version, esc_url( self_admin_url( 'about.php?updated' ) ) ) . '</span>' );
699	show_message( '<span class="hide-if-js">' . sprintf( __( 'Welcome to WordPress %1$s. <a href="%2$s">Learn more</a>.' ), $new_version, esc_url( self_admin_url( 'about.php?updated' ) ) ) . '</span>' );
700	echo '</div>';
701	?>
702<script type="text/javascript">
703window.location = '<?php echo self_admin_url( 'about.php?updated' ); ?>';
704</script>
705	<?php
706
707	// Include admin-footer.php and exit
708	include(ABSPATH . 'wp-admin/admin-footer.php');
709	exit();
710}
711add_action( '_core_updated_successfully', '_redirect_to_about_wordpress' );