Wordpress 4.6
[autoinstalls/wordpress.git] / wp-admin / includes / class-core-upgrader.php
1 <?php
2 /**
3  * Upgrade API: Core_Upgrader class
4  *
5  * @package WordPress
6  * @subpackage Upgrader
7  * @since 4.6.0
8  */
9
10 /**
11  * Core class used for updating core.
12  *
13  * It allows for WordPress to upgrade itself in combination with
14  * the wp-admin/includes/update-core.php file.
15  *
16  * @since 2.8.0
17  * @since 4.6.0 Moved to its own file from wp-admin/includes/class-wp-upgrader.php.
18  *
19  * @see WP_Upgrader
20  */
21 class Core_Upgrader extends WP_Upgrader {
22
23         /**
24          * Initialize the upgrade strings.
25          *
26          * @since 2.8.0
27          * @access public
28          */
29         public function upgrade_strings() {
30                 $this->strings['up_to_date'] = __('WordPress is at the latest version.');
31                 $this->strings['locked'] = __('Another update is currently in progress.');
32                 $this->strings['no_package'] = __('Update package not available.');
33                 $this->strings['downloading_package'] = __('Downloading update from <span class="code">%s</span>&#8230;');
34                 $this->strings['unpack_package'] = __('Unpacking the update&#8230;');
35                 $this->strings['copy_failed'] = __('Could not copy files.');
36                 $this->strings['copy_failed_space'] = __('Could not copy files. You may have run out of disk space.' );
37                 $this->strings['start_rollback'] = __( 'Attempting to roll back to previous version.' );
38                 $this->strings['rollback_was_required'] = __( 'Due to an error during updating, WordPress has rolled back to your previous version.' );
39         }
40
41         /**
42          * Upgrade WordPress core.
43          *
44          * @since 2.8.0
45          * @access public
46          *
47          * @global WP_Filesystem_Base $wp_filesystem Subclass
48          * @global callable           $_wp_filesystem_direct_method
49          *
50          * @param object $current Response object for whether WordPress is current.
51          * @param array  $args {
52          *        Optional. Arguments for upgrading WordPress core. Default empty array.
53          *
54          *        @type bool $pre_check_md5    Whether to check the file checksums before
55          *                                     attempting the upgrade. Default true.
56          *        @type bool $attempt_rollback Whether to attempt to rollback the chances if
57          *                                     there is a problem. Default false.
58          *        @type bool $do_rollback      Whether to perform this "upgrade" as a rollback.
59          *                                     Default false.
60          * }
61          * @return null|false|WP_Error False or WP_Error on failure, null on success.
62          */
63         public function upgrade( $current, $args = array() ) {
64                 global $wp_filesystem;
65
66                 include( ABSPATH . WPINC . '/version.php' ); // $wp_version;
67
68                 $start_time = time();
69
70                 $defaults = array(
71                         'pre_check_md5'    => true,
72                         'attempt_rollback' => false,
73                         'do_rollback'      => false,
74                         'allow_relaxed_file_ownership' => false,
75                 );
76                 $parsed_args = wp_parse_args( $args, $defaults );
77
78                 $this->init();
79                 $this->upgrade_strings();
80
81                 // Is an update available?
82                 if ( !isset( $current->response ) || $current->response == 'latest' )
83                         return new WP_Error('up_to_date', $this->strings['up_to_date']);
84
85                 $res = $this->fs_connect( array( ABSPATH, WP_CONTENT_DIR ), $parsed_args['allow_relaxed_file_ownership'] );
86                 if ( ! $res || is_wp_error( $res ) ) {
87                         return $res;
88                 }
89
90                 $wp_dir = trailingslashit($wp_filesystem->abspath());
91
92                 $partial = true;
93                 if ( $parsed_args['do_rollback'] )
94                         $partial = false;
95                 elseif ( $parsed_args['pre_check_md5'] && ! $this->check_files() )
96                         $partial = false;
97
98                 /*
99                  * If partial update is returned from the API, use that, unless we're doing
100                  * a reinstall. If we cross the new_bundled version number, then use
101                  * the new_bundled zip. Don't though if the constant is set to skip bundled items.
102                  * If the API returns a no_content zip, go with it. Finally, default to the full zip.
103                  */
104                 if ( $parsed_args['do_rollback'] && $current->packages->rollback )
105                         $to_download = 'rollback';
106                 elseif ( $current->packages->partial && 'reinstall' != $current->response && $wp_version == $current->partial_version && $partial )
107                         $to_download = 'partial';
108                 elseif ( $current->packages->new_bundled && version_compare( $wp_version, $current->new_bundled, '<' )
109                         && ( ! defined( 'CORE_UPGRADE_SKIP_NEW_BUNDLED' ) || ! CORE_UPGRADE_SKIP_NEW_BUNDLED ) )
110                         $to_download = 'new_bundled';
111                 elseif ( $current->packages->no_content )
112                         $to_download = 'no_content';
113                 else
114                         $to_download = 'full';
115
116                 // Lock to prevent multiple Core Updates occurring
117                 $lock = WP_Upgrader::create_lock( 'core_updater', 15 * MINUTE_IN_SECONDS );
118                 if ( ! $lock ) {
119                         return new WP_Error( 'locked', $this->strings['locked'] );
120                 }
121
122                 $download = $this->download_package( $current->packages->$to_download );
123                 if ( is_wp_error( $download ) ) {
124                         WP_Upgrader::release_lock( 'core_updater' );
125                         return $download;
126                 }
127
128                 $working_dir = $this->unpack_package( $download );
129                 if ( is_wp_error( $working_dir ) ) {
130                         WP_Upgrader::release_lock( 'core_updater' );
131                         return $working_dir;
132                 }
133
134                 // Copy update-core.php from the new version into place.
135                 if ( !$wp_filesystem->copy($working_dir . '/wordpress/wp-admin/includes/update-core.php', $wp_dir . 'wp-admin/includes/update-core.php', true) ) {
136                         $wp_filesystem->delete($working_dir, true);
137                         WP_Upgrader::release_lock( 'core_updater' );
138                         return new WP_Error( 'copy_failed_for_update_core_file', __( 'The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions.' ), 'wp-admin/includes/update-core.php' );
139                 }
140                 $wp_filesystem->chmod($wp_dir . 'wp-admin/includes/update-core.php', FS_CHMOD_FILE);
141
142                 require_once( ABSPATH . 'wp-admin/includes/update-core.php' );
143
144                 if ( ! function_exists( 'update_core' ) ) {
145                         WP_Upgrader::release_lock( 'core_updater' );
146                         return new WP_Error( 'copy_failed_space', $this->strings['copy_failed_space'] );
147                 }
148
149                 $result = update_core( $working_dir, $wp_dir );
150
151                 // In the event of an issue, we may be able to roll back.
152                 if ( $parsed_args['attempt_rollback'] && $current->packages->rollback && ! $parsed_args['do_rollback'] ) {
153                         $try_rollback = false;
154                         if ( is_wp_error( $result ) ) {
155                                 $error_code = $result->get_error_code();
156                                 /*
157                                  * Not all errors are equal. These codes are critical: copy_failed__copy_dir,
158                                  * mkdir_failed__copy_dir, copy_failed__copy_dir_retry, and disk_full.
159                                  * do_rollback allows for update_core() to trigger a rollback if needed.
160                                  */
161                                 if ( false !== strpos( $error_code, 'do_rollback' ) )
162                                         $try_rollback = true;
163                                 elseif ( false !== strpos( $error_code, '__copy_dir' ) )
164                                         $try_rollback = true;
165                                 elseif ( 'disk_full' === $error_code )
166                                         $try_rollback = true;
167                         }
168
169                         if ( $try_rollback ) {
170                                 /** This filter is documented in wp-admin/includes/update-core.php */
171                                 apply_filters( 'update_feedback', $result );
172
173                                 /** This filter is documented in wp-admin/includes/update-core.php */
174                                 apply_filters( 'update_feedback', $this->strings['start_rollback'] );
175
176                                 $rollback_result = $this->upgrade( $current, array_merge( $parsed_args, array( 'do_rollback' => true ) ) );
177
178                                 $original_result = $result;
179                                 $result = new WP_Error( 'rollback_was_required', $this->strings['rollback_was_required'], (object) array( 'update' => $original_result, 'rollback' => $rollback_result ) );
180                         }
181                 }
182
183                 /** This action is documented in wp-admin/includes/class-wp-upgrader.php */
184                 do_action( 'upgrader_process_complete', $this, array( 'action' => 'update', 'type' => 'core' ) );
185
186                 // Clear the current updates
187                 delete_site_transient( 'update_core' );
188
189                 if ( ! $parsed_args['do_rollback'] ) {
190                         $stats = array(
191                                 'update_type'      => $current->response,
192                                 'success'          => true,
193                                 'fs_method'        => $wp_filesystem->method,
194                                 'fs_method_forced' => defined( 'FS_METHOD' ) || has_filter( 'filesystem_method' ),
195                                 'fs_method_direct' => !empty( $GLOBALS['_wp_filesystem_direct_method'] ) ? $GLOBALS['_wp_filesystem_direct_method'] : '',
196                                 'time_taken'       => time() - $start_time,
197                                 'reported'         => $wp_version,
198                                 'attempted'        => $current->version,
199                         );
200
201                         if ( is_wp_error( $result ) ) {
202                                 $stats['success'] = false;
203                                 // Did a rollback occur?
204                                 if ( ! empty( $try_rollback ) ) {
205                                         $stats['error_code'] = $original_result->get_error_code();
206                                         $stats['error_data'] = $original_result->get_error_data();
207                                         // Was the rollback successful? If not, collect its error too.
208                                         $stats['rollback'] = ! is_wp_error( $rollback_result );
209                                         if ( is_wp_error( $rollback_result ) ) {
210                                                 $stats['rollback_code'] = $rollback_result->get_error_code();
211                                                 $stats['rollback_data'] = $rollback_result->get_error_data();
212                                         }
213                                 } else {
214                                         $stats['error_code'] = $result->get_error_code();
215                                         $stats['error_data'] = $result->get_error_data();
216                                 }
217                         }
218
219                         wp_version_check( $stats );
220                 }
221
222                 WP_Upgrader::release_lock( 'core_updater' );
223
224                 return $result;
225         }
226
227         /**
228          * Determines if this WordPress Core version should update to an offered version or not.
229          *
230          * @since 3.7.0
231          * @access public
232          *
233          * @static
234          *
235          * @param string $offered_ver The offered version, of the format x.y.z.
236          * @return bool True if we should update to the offered version, otherwise false.
237          */
238         public static function should_update_to_version( $offered_ver ) {
239                 include( ABSPATH . WPINC . '/version.php' ); // $wp_version; // x.y.z
240
241                 $current_branch = implode( '.', array_slice( preg_split( '/[.-]/', $wp_version  ), 0, 2 ) ); // x.y
242                 $new_branch     = implode( '.', array_slice( preg_split( '/[.-]/', $offered_ver ), 0, 2 ) ); // x.y
243                 $current_is_development_version = (bool) strpos( $wp_version, '-' );
244
245                 // Defaults:
246                 $upgrade_dev   = true;
247                 $upgrade_minor = true;
248                 $upgrade_major = false;
249
250                 // WP_AUTO_UPDATE_CORE = true (all), 'minor', false.
251                 if ( defined( 'WP_AUTO_UPDATE_CORE' ) ) {
252                         if ( false === WP_AUTO_UPDATE_CORE ) {
253                                 // Defaults to turned off, unless a filter allows it
254                                 $upgrade_dev = $upgrade_minor = $upgrade_major = false;
255                         } elseif ( true === WP_AUTO_UPDATE_CORE ) {
256                                 // ALL updates for core
257                                 $upgrade_dev = $upgrade_minor = $upgrade_major = true;
258                         } elseif ( 'minor' === WP_AUTO_UPDATE_CORE ) {
259                                 // Only minor updates for core
260                                 $upgrade_dev = $upgrade_major = false;
261                                 $upgrade_minor = true;
262                         }
263                 }
264
265                 // 1: If we're already on that version, not much point in updating?
266                 if ( $offered_ver == $wp_version )
267                         return false;
268
269                 // 2: If we're running a newer version, that's a nope
270                 if ( version_compare( $wp_version, $offered_ver, '>' ) )
271                         return false;
272
273                 $failure_data = get_site_option( 'auto_core_update_failed' );
274                 if ( $failure_data ) {
275                         // If this was a critical update failure, cannot update.
276                         if ( ! empty( $failure_data['critical'] ) )
277                                 return false;
278
279                         // Don't claim we can update on update-core.php if we have a non-critical failure logged.
280                         if ( $wp_version == $failure_data['current'] && false !== strpos( $offered_ver, '.1.next.minor' ) )
281                                 return false;
282
283                         // Cannot update if we're retrying the same A to B update that caused a non-critical failure.
284                         // Some non-critical failures do allow retries, like download_failed.
285                         // 3.7.1 => 3.7.2 resulted in files_not_writable, if we are still on 3.7.1 and still trying to update to 3.7.2.
286                         if ( empty( $failure_data['retry'] ) && $wp_version == $failure_data['current'] && $offered_ver == $failure_data['attempted'] )
287                                 return false;
288                 }
289
290                 // 3: 3.7-alpha-25000 -> 3.7-alpha-25678 -> 3.7-beta1 -> 3.7-beta2
291                 if ( $current_is_development_version ) {
292
293                         /**
294                          * Filters whether to enable automatic core updates for development versions.
295                          *
296                          * @since 3.7.0
297                          *
298                          * @param bool $upgrade_dev Whether to enable automatic updates for
299                          *                          development versions.
300                          */
301                         if ( ! apply_filters( 'allow_dev_auto_core_updates', $upgrade_dev ) )
302                                 return false;
303                         // Else fall through to minor + major branches below.
304                 }
305
306                 // 4: Minor In-branch updates (3.7.0 -> 3.7.1 -> 3.7.2 -> 3.7.4)
307                 if ( $current_branch == $new_branch ) {
308
309                         /**
310                          * Filters whether to enable minor automatic core updates.
311                          *
312                          * @since 3.7.0
313                          *
314                          * @param bool $upgrade_minor Whether to enable minor automatic core updates.
315                          */
316                         return apply_filters( 'allow_minor_auto_core_updates', $upgrade_minor );
317                 }
318
319                 // 5: Major version updates (3.7.0 -> 3.8.0 -> 3.9.1)
320                 if ( version_compare( $new_branch, $current_branch, '>' ) ) {
321
322                         /**
323                          * Filters whether to enable major automatic core updates.
324                          *
325                          * @since 3.7.0
326                          *
327                          * @param bool $upgrade_major Whether to enable major automatic core updates.
328                          */
329                         return apply_filters( 'allow_major_auto_core_updates', $upgrade_major );
330                 }
331
332                 // If we're not sure, we don't want it
333                 return false;
334         }
335
336         /**
337          * Compare the disk file checksums against the expected checksums.
338          *
339          * @since 3.7.0
340          * @access public
341          *
342          * @global string $wp_version
343          * @global string $wp_local_package
344          *
345          * @return bool True if the checksums match, otherwise false.
346          */
347         public function check_files() {
348                 global $wp_version, $wp_local_package;
349
350                 $checksums = get_core_checksums( $wp_version, isset( $wp_local_package ) ? $wp_local_package : 'en_US' );
351
352                 if ( ! is_array( $checksums ) )
353                         return false;
354
355                 foreach ( $checksums as $file => $checksum ) {
356                         // Skip files which get updated
357                         if ( 'wp-content' == substr( $file, 0, 10 ) )
358                                 continue;
359                         if ( ! file_exists( ABSPATH . $file ) || md5_file( ABSPATH . $file ) !== $checksum )
360                                 return false;
361                 }
362
363                 return true;
364         }
365 }