Allow reset of global services (redux).

[lhc/web/wiklou.git] / includes / installer / Installer.php

diff --git a/includes/installer/Installer.php b/includes/installer/Installer.php
index 3d1c860..97214da 100644 (file)
--- a/includes/installer/Installer.php
+++ b/includes/installer/Installer.php
@@ -351,37 +351,67 @@ abstract class Installer {
         */
        abstract public function showStatusMessage( Status $status );
 
+       /**
+        * Constructs a Config object that contains configuration settings that should be
+        * overwritten for the installation process.
+        *
+        * @since 1.27
+        *
+        * @param Config $baseConfig
+        *
+        * @return Config The config to use during installation.
+        */
+       public static function getInstallerConfig( Config $baseConfig ) {
+               $configOverrides = new HashConfig();
+
+               // disable (problematic) object cache types explicitly, preserving all other (working) ones
+               // bug T113843
+               $emptyCache = [ 'class' => 'EmptyBagOStuff' ];
+
+               $objectCaches = [
+                               CACHE_NONE => $emptyCache,
+                               CACHE_DB => $emptyCache,
+                               CACHE_ANYTHING => $emptyCache,
+                               CACHE_MEMCACHED => $emptyCache,
+                       ] + $baseConfig->get( 'ObjectCaches' );
+
+               $configOverrides->set( 'ObjectCaches', $objectCaches );
+
+               // Load the installer's i18n.
+               $messageDirs = $baseConfig->get( 'MessagesDirs' );
+               $messageDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
+
+               $configOverrides->set( 'MessagesDirs', $messageDirs );
+
+               return new MultiConfig( [ $configOverrides, $baseConfig ] );
+       }
+
        /**
         * Constructor, always call this from child classes.
         */
        public function __construct() {
-               global $wgMessagesDirs, $wgUser;
+               global $wgMemc, $wgUser;
+
+               $defaultConfig = new GlobalVarConfig(); // all the stuff from DefaultSettings.php
+               $installerConfig = self::getInstallerConfig( $defaultConfig );
+
+               // Reset all services and inject config overrides
+               MediaWiki\MediaWikiServices::resetGlobalInstance( $installerConfig );
 
                // Don't attempt to load user language options (T126177)
                // This will be overridden in the web installer with the user-specified language
                RequestContext::getMain()->setLanguage( 'en' );
 
                // Disable the i18n cache
+               // TODO: manage LocalisationCache singleton in MediaWikiServices
                Language::getLocalisationCache()->disableBackend();
-               // Disable LoadBalancer and wfGetDB etc.
-               LBFactory::disableBackend();
+
+               // Disable all global services, since we don't have any configuration yet!
+               MediaWiki\MediaWikiServices::disableStorageBackend();
 
                // Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
                // SqlBagOStuff will then throw since we just disabled wfGetDB)
-               $GLOBALS['wgMemc'] = new EmptyBagOStuff;
-               ObjectCache::clear();
-               $emptyCache = [ 'class' => 'EmptyBagOStuff' ];
-               // disable (problematic) object cache types explicitly, preserving all other (working) ones
-               // bug T113843
-               $GLOBALS['wgObjectCaches'] = [
-                       CACHE_NONE => $emptyCache,
-                       CACHE_DB => $emptyCache,
-                       CACHE_ANYTHING => $emptyCache,
-                       CACHE_MEMCACHED => $emptyCache,
-               ] + $GLOBALS['wgObjectCaches'];
-
-               // Load the installer's i18n.
-               $wgMessagesDirs['MediawikiInstaller'] = __DIR__ . '/i18n';
+               $wgMemc = ObjectCache::getInstance( CACHE_NONE );
 
                // Having a user with id = 0 safeguards us from DB access via User::loadOptions().
                $wgUser = User::newFromId( 0 );