WordPress 3.4.1
[autoinstalls/wordpress.git] / wp-admin / includes / update-core.php
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  */
18 global $_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  */
417 global $_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 $to Path to old WordPress installation.
469  * @return WP_Error|null WP_Error on failure, null on success.
470  */
471 function update_core($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 = '3.4.1';
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 $skip_list a list of files/folders to skip copying
630  * @return mixed WP_Error on failure, True on success.
631  */
632 function _copy_dir($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  */
680 function _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">
703 window.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 }
711 add_action( '_core_updated_successfully', '_redirect_to_about_wordpress' );