Introduced version
* Directories should be noted by suffixing it with a trailing slash (/)
*
* @since 3.2.0
* @since 4.4.0 New themes are not automatically installed on upgrade.
* This can still be explicitly asked for by defining
* CORE_UPGRADE_SKIP_NEW_BUNDLED as false.
* @global array $_new_bundled_files
* @var array
* @name $_new_bundled_files
*/
global $_new_bundled_files;
$_new_bundled_files = array(
'plugins/akismet/' => '2.0',
'themes/twentyten/' => '3.0',
'themes/twentyeleven/' => '3.2',
'themes/twentytwelve/' => '3.5',
'themes/twentythirteen/' => '3.6',
'themes/twentyfourteen/' => '3.8',
'themes/twentyfifteen/' => '4.1',
'themes/twentysixteen/' => '4.4',
'themes/twentyseventeen/' => '4.7',
);
// If not explicitly defined as false, don't install new default themes.
if ( ! defined( 'CORE_UPGRADE_SKIP_NEW_BUNDLED' ) || CORE_UPGRADE_SKIP_NEW_BUNDLED ) {
$_new_bundled_files = array( 'plugins/akismet/' => '2.0' );
}
/**
* Upgrades the core of WordPress.
*
* This will create a .maintenance file at the base of the WordPress directory
* to ensure that people can not access the web site, when the files are being
* copied to their locations.
*
* The files in the `$_old_files` list will be removed and the new files
* copied from the zip file after the database is upgraded.
*
* The files in the `$_new_bundled_files` list will be added to the installation
* if the version is greater than or equal to the old version being upgraded.
*
* The steps for the upgrader for after the new release is downloaded and
* unzipped is:
* 1. Test unzipped location for select files to ensure that unzipped worked.
* 2. Create the .maintenance file in current WordPress base.
* 3. Copy new WordPress directory over old WordPress files.
* 4. Upgrade WordPress to new version.
* 4.1. Copy all files/folders other than wp-content
* 4.2. Copy any language files to WP_LANG_DIR (which may differ from WP_CONTENT_DIR
* 4.3. Copy any new bundled themes/plugins to their respective locations
* 5. Delete new WordPress directory path.
* 6. Delete .maintenance file.
* 7. Remove old files.
* 8. Delete 'update_core' option.
*
* There are several areas of failure. For instance if PHP times out before step
* 6, then you will not be able to access any portion of your site. Also, since
* the upgrade will not continue where it left off, you will not be able to
* automatically remove old files and remove the 'update_core' option. This
* isn't that bad.
*
* If the copy of the new WordPress over the old fails, then the worse is that
* the new WordPress directory will remain.
*
* If it is assumed that every file will be copied over, including plugins and
* themes, then if you edit the default theme, you should rename it, so that
* your changes remain.
*
* @since 2.7.0
*
* @global WP_Filesystem_Base $wp_filesystem
* @global array $_old_files
* @global array $_new_bundled_files
* @global wpdb $wpdb
* @global string $wp_version
* @global string $required_php_version
* @global string $required_mysql_version
*
* @param string $from New release unzipped path.
* @param string $to Path to old WordPress installation.
* @return WP_Error|null WP_Error on failure, null on success.
*/
function update_core($from, $to) {
global $wp_filesystem, $_old_files, $_new_bundled_files, $wpdb;
@set_time_limit( 300 );
/**
* Filters feedback messages displayed during the core update process.
*
* The filter is first evaluated after the zip file for the latest version
* has been downloaded and unzipped. It is evaluated five more times during
* the process:
*
* 1. Before WordPress begins the core upgrade process.
* 2. Before Maintenance Mode is enabled.
* 3. Before WordPress begins copying over the necessary files.
* 4. Before Maintenance Mode is disabled.
* 5. Before the database is upgraded.
*
* @since 2.5.0
*
* @param string $feedback The core update feedback messages.
*/
apply_filters( 'update_feedback', __( 'Verifying the unpacked files…' ) );
// Sanity check the unzipped distribution.
$distro = '';
$roots = array( '/wordpress/', '/wordpress-mu/' );
foreach ( $roots as $root ) {
if ( $wp_filesystem->exists( $from . $root . 'readme.html' ) && $wp_filesystem->exists( $from . $root . 'wp-includes/version.php' ) ) {
$distro = $root;
break;
}
}
if ( ! $distro ) {
$wp_filesystem->delete( $from, true );
return new WP_Error( 'insane_distro', __('The update could not be unpacked') );
}
/**
* Import $wp_version, $required_php_version, and $required_mysql_version from the new version
* $wp_filesystem->wp_content_dir() returned unslashed pre-2.8
*
* @global string $wp_version
* @global string $required_php_version
* @global string $required_mysql_version
*/
global $wp_version, $required_php_version, $required_mysql_version;
$versions_file = trailingslashit( $wp_filesystem->wp_content_dir() ) . 'upgrade/version-current.php';
if ( ! $wp_filesystem->copy( $from . $distro . 'wp-includes/version.php', $versions_file ) ) {
$wp_filesystem->delete( $from, true );
return new WP_Error( 'copy_failed_for_version_file', __( 'The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions.' ), 'wp-includes/version.php' );
}
$wp_filesystem->chmod( $versions_file, FS_CHMOD_FILE );
require( WP_CONTENT_DIR . '/upgrade/version-current.php' );
$wp_filesystem->delete( $versions_file );
$php_version = phpversion();
$mysql_version = $wpdb->db_version();
$old_wp_version = $wp_version; // The version of WordPress we're updating from
$development_build = ( false !== strpos( $old_wp_version . $wp_version, '-' ) ); // a dash in the version indicates a Development release
$php_compat = version_compare( $php_version, $required_php_version, '>=' );
if ( file_exists( WP_CONTENT_DIR . '/db.php' ) && empty( $wpdb->is_mysql ) )
$mysql_compat = true;
else
$mysql_compat = version_compare( $mysql_version, $required_mysql_version, '>=' );
if ( !$mysql_compat || !$php_compat )
$wp_filesystem->delete($from, true);
if ( !$mysql_compat && !$php_compat )
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, $mysql_version ) );
elseif ( !$php_compat )
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, $php_version ) );
elseif ( !$mysql_compat )
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 ) );
/** This filter is documented in wp-admin/includes/update-core.php */
apply_filters( 'update_feedback', __( 'Preparing to install the latest version…' ) );
// Don't copy wp-content, we'll deal with that below
// We also copy version.php last so failed updates report their old version
$skip = array( 'wp-content', 'wp-includes/version.php' );
$check_is_writable = array();
// Check to see which files don't really need updating - only available for 3.7 and higher
if ( function_exists( 'get_core_checksums' ) ) {
// Find the local version of the working directory
$working_dir_local = WP_CONTENT_DIR . '/upgrade/' . basename( $from ) . $distro;
$checksums = get_core_checksums( $wp_version, isset( $wp_local_package ) ? $wp_local_package : 'en_US' );
if ( is_array( $checksums ) && isset( $checksums[ $wp_version ] ) )
$checksums = $checksums[ $wp_version ]; // Compat code for 3.7-beta2
if ( is_array( $checksums ) ) {
foreach ( $checksums as $file => $checksum ) {
if ( 'wp-content' == substr( $file, 0, 10 ) )
continue;
if ( ! file_exists( ABSPATH . $file ) )
continue;
if ( ! file_exists( $working_dir_local . $file ) )
continue;
if ( '.' === dirname( $file ) && in_array( pathinfo( $file, PATHINFO_EXTENSION ), array( 'html', 'txt' ) ) )
continue;
if ( md5_file( ABSPATH . $file ) === $checksum )
$skip[] = $file;
else
$check_is_writable[ $file ] = ABSPATH . $file;
}
}
}
// If we're using the direct method, we can predict write failures that are due to permissions.
if ( $check_is_writable && 'direct' === $wp_filesystem->method ) {
$files_writable = array_filter( $check_is_writable, array( $wp_filesystem, 'is_writable' ) );
if ( $files_writable !== $check_is_writable ) {
$files_not_writable = array_diff_key( $check_is_writable, $files_writable );
foreach ( $files_not_writable as $relative_file_not_writable => $file_not_writable ) {
// If the writable check failed, chmod file to 0644 and try again, same as copy_dir().
$wp_filesystem->chmod( $file_not_writable, FS_CHMOD_FILE );
if ( $wp_filesystem->is_writable( $file_not_writable ) )
unset( $files_not_writable[ $relative_file_not_writable ] );
}
// Store package-relative paths (the key) of non-writable files in the WP_Error object.
$error_data = version_compare( $old_wp_version, '3.7-beta2', '>' ) ? array_keys( $files_not_writable ) : '';
if ( $files_not_writable )
return new WP_Error( 'files_not_writable', __( 'The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions.' ), implode( ', ', $error_data ) );
}
}
/** This filter is documented in wp-admin/includes/update-core.php */
apply_filters( 'update_feedback', __( 'Enabling Maintenance mode…' ) );
// Create maintenance file to signal that we are upgrading
$maintenance_string = '';
$maintenance_file = $to . '.maintenance';
$wp_filesystem->delete($maintenance_file);
$wp_filesystem->put_contents($maintenance_file, $maintenance_string, FS_CHMOD_FILE);
/** This filter is documented in wp-admin/includes/update-core.php */
apply_filters( 'update_feedback', __( 'Copying the required files…' ) );
// Copy new versions of WP files into place.
$result = _copy_dir( $from . $distro, $to, $skip );
if ( is_wp_error( $result ) )
$result = new WP_Error( $result->get_error_code(), $result->get_error_message(), substr( $result->get_error_data(), strlen( $to ) ) );
// Since we know the core files have copied over, we can now copy the version file
if ( ! is_wp_error( $result ) ) {
if ( ! $wp_filesystem->copy( $from . $distro . 'wp-includes/version.php', $to . 'wp-includes/version.php', true /* overwrite */ ) ) {
$wp_filesystem->delete( $from, true );
$result = new WP_Error( 'copy_failed_for_version_file', __( 'The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions.' ), 'wp-includes/version.php' );
}
$wp_filesystem->chmod( $to . 'wp-includes/version.php', FS_CHMOD_FILE );
}
// Check to make sure everything copied correctly, ignoring the contents of wp-content
$skip = array( 'wp-content' );
$failed = array();
if ( isset( $checksums ) && is_array( $checksums ) ) {
foreach ( $checksums as $file => $checksum ) {
if ( 'wp-content' == substr( $file, 0, 10 ) )
continue;
if ( ! file_exists( $working_dir_local . $file ) )
continue;
if ( '.' === dirname( $file ) && in_array( pathinfo( $file, PATHINFO_EXTENSION ), array( 'html', 'txt' ) ) ) {
$skip[] = $file;
continue;
}
if ( file_exists( ABSPATH . $file ) && md5_file( ABSPATH . $file ) == $checksum )
$skip[] = $file;
else
$failed[] = $file;
}
}
// Some files didn't copy properly
if ( ! empty( $failed ) ) {
$total_size = 0;
foreach ( $failed as $file ) {
if ( file_exists( $working_dir_local . $file ) )
$total_size += filesize( $working_dir_local . $file );
}
// If we don't have enough free space, it isn't worth trying again.
// Unlikely to be hit due to the check in unzip_file().
$available_space = @disk_free_space( ABSPATH );
if ( $available_space && $total_size >= $available_space ) {
$result = new WP_Error( 'disk_full', __( 'There is not enough free disk space to complete the update.' ) );
} else {
$result = _copy_dir( $from . $distro, $to, $skip );
if ( is_wp_error( $result ) )
$result = new WP_Error( $result->get_error_code() . '_retry', $result->get_error_message(), substr( $result->get_error_data(), strlen( $to ) ) );
}
}
// Custom Content Directory needs updating now.
// Copy Languages
if ( !is_wp_error($result) && $wp_filesystem->is_dir($from . $distro . 'wp-content/languages') ) {
if ( WP_LANG_DIR != ABSPATH . WPINC . '/languages' || @is_dir(WP_LANG_DIR) )
$lang_dir = WP_LANG_DIR;
else
$lang_dir = WP_CONTENT_DIR . '/languages';
if ( !@is_dir($lang_dir) && 0 === strpos($lang_dir, ABSPATH) ) { // Check the language directory exists first
$wp_filesystem->mkdir($to . str_replace(ABSPATH, '', $lang_dir), FS_CHMOD_DIR); // If it's within the ABSPATH we can handle it here, otherwise they're out of luck.
clearstatcache(); // for FTP, Need to clear the stat cache
}
if ( @is_dir($lang_dir) ) {
$wp_lang_dir = $wp_filesystem->find_folder($lang_dir);
if ( $wp_lang_dir ) {
$result = copy_dir($from . $distro . 'wp-content/languages/', $wp_lang_dir);
if ( is_wp_error( $result ) )
$result = new WP_Error( $result->get_error_code() . '_languages', $result->get_error_message(), substr( $result->get_error_data(), strlen( $wp_lang_dir ) ) );
}
}
}
/** This filter is documented in wp-admin/includes/update-core.php */
apply_filters( 'update_feedback', __( 'Disabling Maintenance mode…' ) );
// Remove maintenance file, we're done with potential site-breaking changes
$wp_filesystem->delete( $maintenance_file );
// 3.5 -> 3.5+ - an empty twentytwelve directory was created upon upgrade to 3.5 for some users, preventing installation of Twenty Twelve.
if ( '3.5' == $old_wp_version ) {
if ( is_dir( WP_CONTENT_DIR . '/themes/twentytwelve' ) && ! file_exists( WP_CONTENT_DIR . '/themes/twentytwelve/style.css' ) ) {
$wp_filesystem->delete( $wp_filesystem->wp_themes_dir() . 'twentytwelve/' );
}
}
// Copy New bundled plugins & themes
// This gives us the ability to install new plugins & themes bundled with future versions of WordPress whilst avoiding the re-install upon upgrade issue.
// $development_build controls us overwriting bundled themes and plugins when a non-stable release is being updated
if ( !is_wp_error($result) && ( ! defined('CORE_UPGRADE_SKIP_NEW_BUNDLED') || ! CORE_UPGRADE_SKIP_NEW_BUNDLED ) ) {
foreach ( (array) $_new_bundled_files as $file => $introduced_version ) {
// If a $development_build or if $introduced version is greater than what the site was previously running
if ( $development_build || version_compare( $introduced_version, $old_wp_version, '>' ) ) {
$directory = ('/' == $file[ strlen($file)-1 ]);
list($type, $filename) = explode('/', $file, 2);
// Check to see if the bundled items exist before attempting to copy them
if ( ! $wp_filesystem->exists( $from . $distro . 'wp-content/' . $file ) )
continue;
if ( 'plugins' == $type )
$dest = $wp_filesystem->wp_plugins_dir();
elseif ( 'themes' == $type )
$dest = trailingslashit($wp_filesystem->wp_themes_dir()); // Back-compat, ::wp_themes_dir() did not return trailingslash'd pre-3.2
else
continue;
if ( ! $directory ) {
if ( ! $development_build && $wp_filesystem->exists( $dest . $filename ) )
continue;
if ( ! $wp_filesystem->copy($from . $distro . 'wp-content/' . $file, $dest . $filename, FS_CHMOD_FILE) )
$result = new WP_Error( "copy_failed_for_new_bundled_$type", __( 'Could not copy file.' ), $dest . $filename );
} else {
if ( ! $development_build && $wp_filesystem->is_dir( $dest . $filename ) )
continue;
$wp_filesystem->mkdir($dest . $filename, FS_CHMOD_DIR);
$_result = copy_dir( $from . $distro . 'wp-content/' . $file, $dest . $filename);
// If a error occurs partway through this final step, keep the error flowing through, but keep process going.
if ( is_wp_error( $_result ) ) {
if ( ! is_wp_error( $result ) )
$result = new WP_Error;
$result->add( $_result->get_error_code() . "_$type", $_result->get_error_message(), substr( $_result->get_error_data(), strlen( $dest ) ) );
}
}
}
} //end foreach
}
// Handle $result error from the above blocks
if ( is_wp_error($result) ) {
$wp_filesystem->delete($from, true);
return $result;
}
// Remove old files
foreach ( $_old_files as $old_file ) {
$old_file = $to . $old_file;
if ( !$wp_filesystem->exists($old_file) )
continue;
$wp_filesystem->delete($old_file, true);
}
// Remove any Genericons example.html's from the filesystem
_upgrade_422_remove_genericons();
// Remove the REST API plugin if its version is Beta 4 or lower
_upgrade_440_force_deactivate_incompatible_plugins();
// Upgrade DB with separate request
/** This filter is documented in wp-admin/includes/update-core.php */
apply_filters( 'update_feedback', __( 'Upgrading database…' ) );
$db_upgrade_url = admin_url('upgrade.php?step=upgrade_db');
wp_remote_post($db_upgrade_url, array('timeout' => 60));
// Clear the cache to prevent an update_option() from saving a stale db_version to the cache
wp_cache_flush();
// (Not all cache back ends listen to 'flush')
wp_cache_delete( 'alloptions', 'options' );
// Remove working directory
$wp_filesystem->delete($from, true);
// Force refresh of update information
if ( function_exists('delete_site_transient') )
delete_site_transient('update_core');
else
delete_option('update_core');
/**
* Fires after WordPress core has been successfully updated.
*
* @since 3.3.0
*
* @param string $wp_version The current WordPress version.
*/
do_action( '_core_updated_successfully', $wp_version );
// Clear the option that blocks auto updates after failures, now that we've been successful.
if ( function_exists( 'delete_site_option' ) )
delete_site_option( 'auto_core_update_failed' );
return $wp_version;
}
/**
* Copies a directory from one location to another via the WordPress Filesystem Abstraction.
* Assumes that WP_Filesystem() has already been called and setup.
*
* This is a temporary function for the 3.1 -> 3.2 upgrade, as well as for those upgrading to
* 3.7+
*
* @ignore
* @since 3.2.0
* @since 3.7.0 Updated not to use a regular expression for the skip list
* @see copy_dir()
*
* @global WP_Filesystem_Base $wp_filesystem
*
* @param string $from source directory
* @param string $to destination directory
* @param array $skip_list a list of files/folders to skip copying
* @return mixed WP_Error on failure, True on success.
*/
function _copy_dir($from, $to, $skip_list = array() ) {
global $wp_filesystem;
$dirlist = $wp_filesystem->dirlist($from);
$from = trailingslashit($from);
$to = trailingslashit($to);
foreach ( (array) $dirlist as $filename => $fileinfo ) {
if ( in_array( $filename, $skip_list ) )
continue;
if ( 'f' == $fileinfo['type'] ) {
if ( ! $wp_filesystem->copy($from . $filename, $to . $filename, true, FS_CHMOD_FILE) ) {
// If copy failed, chmod file to 0644 and try again.
$wp_filesystem->chmod( $to . $filename, FS_CHMOD_FILE );
if ( ! $wp_filesystem->copy($from . $filename, $to . $filename, true, FS_CHMOD_FILE) )
return new WP_Error( 'copy_failed__copy_dir', __( 'Could not copy file.' ), $to . $filename );
}
} elseif ( 'd' == $fileinfo['type'] ) {
if ( !$wp_filesystem->is_dir($to . $filename) ) {
if ( !$wp_filesystem->mkdir($to . $filename, FS_CHMOD_DIR) )
return new WP_Error( 'mkdir_failed__copy_dir', __( 'Could not create directory.' ), $to . $filename );
}
/*
* Generate the $sub_skip_list for the subdirectory as a sub-set
* of the existing $skip_list.
*/
$sub_skip_list = array();
foreach ( $skip_list as $skip_item ) {
if ( 0 === strpos( $skip_item, $filename . '/' ) )
$sub_skip_list[] = preg_replace( '!^' . preg_quote( $filename, '!' ) . '/!i', '', $skip_item );
}
$result = _copy_dir($from . $filename, $to . $filename, $sub_skip_list);
if ( is_wp_error($result) )
return $result;
}
}
return true;
}
/**
* Redirect to the About WordPress page after a successful upgrade.
*
* This function is only needed when the existing install is older than 3.4.0.
*
* @since 3.3.0
*
* @global string $wp_version
* @global string $pagenow
* @global string $action
*
* @param string $new_version
*/
function _redirect_to_about_wordpress( $new_version ) {
global $wp_version, $pagenow, $action;
if ( version_compare( $wp_version, '3.4-RC1', '>=' ) )
return;
// Ensure we only run this on the update-core.php page. The Core_Upgrader may be used in other contexts.
if ( 'update-core.php' != $pagenow )
return;
if ( 'do-core-upgrade' != $action && 'do-core-reinstall' != $action )
return;
// Load the updated default text localization domain for new strings.
load_default_textdomain();
// See do_core_upgrade()
show_message( __('WordPress updated successfully') );
// self_admin_url() won't exist when upgrading from <= 3.0, so relative URLs are intentional.
show_message( '' . sprintf( __( 'Welcome to WordPress %1$s. You will be redirected to the About WordPress screen. If not, click here.' ), $new_version, 'about.php?updated' ) . '' );
show_message( '' . sprintf( __( 'Welcome to WordPress %1$s. Learn more.' ), $new_version, 'about.php?updated' ) . '' );
echo '';
?>
find_folder( trailingslashit( dirname( $file ) ) );
if ( empty( $gen_dir ) ) {
continue;
}
// The path when the file is accessed via WP_Filesystem may differ in the case of FTP
$remote_file = $gen_dir . basename( $file );
if ( ! $wp_filesystem->exists( $remote_file ) ) {
continue;
}
if ( ! $wp_filesystem->delete( $remote_file, false, 'f' ) ) {
$wp_filesystem->put_contents( $remote_file, '' );
}
}
}
/**
* Recursively find Genericons example files in a given folder.
*
* @ignore
* @since 4.2.2
*
* @param string $directory Directory path. Expects trailingslashed.
* @return array
*/
function _upgrade_422_find_genericons_files_in_folder( $directory ) {
$directory = trailingslashit( $directory );
$files = array();
if ( file_exists( "{$directory}example.html" ) && false !== strpos( file_get_contents( "{$directory}example.html" ), 'Genericons' ) ) {
$files[] = "{$directory}example.html";
}
$dirs = glob( $directory . '*', GLOB_ONLYDIR );
if ( $dirs ) {
foreach ( $dirs as $dir ) {
$files = array_merge( $files, _upgrade_422_find_genericons_files_in_folder( $dir ) );
}
}
return $files;
}
/**
* @ignore
* @since 4.4.0
*/
function _upgrade_440_force_deactivate_incompatible_plugins() {
if ( defined( 'REST_API_VERSION' ) && version_compare( REST_API_VERSION, '2.0-beta4', '<=' ) ) {
deactivate_plugins( array( 'rest-api/plugin.php' ), true );
}
}