Installer.php
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Installer.php
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	<?php
	/**
	* Base code for MediaWiki installer.
	*
	* DO NOT PATCH THIS FILE IF YOU NEED TO CHANGE INSTALLER BEHAVIOR IN YOUR PACKAGE!
	* See mw-config/overrides/README for details.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, write to the Free Software Foundation, Inc.,
	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	* http://www.gnu.org/copyleft/gpl.html
	*
	* @file
	* @ingroup Installer
	*/

	namespace MediaWiki\Installer;

	use AutoLoader;
	use Exception;
	use ExecutableFinder;
	use GuzzleHttp\Psr7\Header;
	use IntlChar;
	use InvalidArgumentException;
	use LogicException;
	use MediaWiki\Config\Config;
	use MediaWiki\Config\GlobalVarConfig;
	use MediaWiki\Config\HashConfig;
	use MediaWiki\Config\MultiConfig;
	use MediaWiki\Content\WikitextContent;
	use MediaWiki\Context\RequestContext;
	use MediaWiki\Deferred\SiteStatsUpdate;
	use MediaWiki\HookContainer\HookContainer;
	use MediaWiki\HookContainer\StaticHookRegistry;
	use MediaWiki\Interwiki\NullInterwikiLookup;
	use MediaWiki\Language\Language;
	use MediaWiki\MainConfigNames;
	use MediaWiki\MainConfigSchema;
	use MediaWiki\MediaWikiServices;
	use MediaWiki\Parser\Parser;
	use MediaWiki\Parser\ParserOptions;
	use MediaWiki\Registration\ExtensionDependencyError;
	use MediaWiki\Registration\ExtensionProcessor;
	use MediaWiki\Registration\ExtensionRegistry;
	use MediaWiki\Settings\SettingsBuilder;
	use MediaWiki\Status\Status;
	use MediaWiki\StubObject\StubGlobalUser;
	use MediaWiki\Title\Title;
	use MediaWiki\User\Options\StaticUserOptionsLookup;
	use MediaWiki\User\User;
	use MediaWiki\Utils\UrlUtils;
	use MWCryptRand;
	use MWLBFactory;
	use RuntimeException;
	use Wikimedia\AtEase\AtEase;
	use Wikimedia\Message\MessageSpecifier;
	use Wikimedia\ObjectCache\EmptyBagOStuff;
	use Wikimedia\Rdbms\LBFactorySingle;
	use Wikimedia\Services\ServiceDisabledException;

	/**
	* The Installer helps admins create or upgrade their wiki.
	*
	* The installer classes are exposed through these human interfaces:
	*
	* - The `maintenance/install.php` script, backed by CliInstaller.
	* - The `maintenance/update.php` script, backed by DatabaseUpdater.
	* - The `mw-config/index.php` web entry point, backed by WebInstaller.
	*
	* @defgroup Installer Installer
	*/

	/**
	* Base installer class.
	*
	* This class provides the base for installation and update functionality
	* for both MediaWiki core and extensions.
	*
	* @ingroup Installer
	* @since 1.17
	*/
	abstract class Installer {

	/**
	* URL to mediawiki-announce list summary page
	*/
	private const MEDIAWIKI_ANNOUNCE_URL =
	'https://lists.wikimedia.org/postorius/lists/mediawiki-announce.lists.wikimedia.org/';

	/**
	* @var array
	*/
	protected $settings;

	/**
	* List of detected DBs, access using getCompiledDBs().
	*
	* @var array
	*/
	protected $compiledDBs;

	/**
	* Cached DB installer instances, access using getDBInstaller().
	*
	* @var array
	*/
	protected $dbInstallers = [];

	/**
	* Minimum memory size in MiB.
	*
	* @var int
	*/
	protected $minMemorySize = 50;

	/**
	* Cached Title, used by parse().
	*
	* @var Title
	*/
	protected $parserTitle;

	/**
	* Cached ParserOptions, used by parse().
	*
	* @var ParserOptions
	*/
	protected $parserOptions;

	/**
	* Known database types. These correspond to the class names <type>Installer,
	* and are also MediaWiki database types valid for $wgDBtype.
	*
	* To add a new type, create a <type>Installer class and a Database<type>
	* class, and add a config-type-<type> message to MessagesEn.php.
	*
	* @var array
	*/
	protected static $dbTypes = [
	'mysql',
	'postgres',
	'sqlite',
	];

	/**
	* A list of environment check methods called by doEnvironmentChecks().
	* These may output warnings using showMessage(), and/or abort the
	* installation process by returning false.
	*
	* For the WebInstaller these are only called on the Welcome page,
	* if these methods have side-effects that should affect later page loads
	* (as well as the generated stylesheet), use envPreps instead.
	*
	* @var array
	*/
	protected $envChecks = [
	'envCheckLibicu',
	'envCheckDB',
	'envCheckPCRE',
	'envCheckMemory',
	'envCheckCache',
	'envCheckModSecurity',
	'envCheckDiff3',
	'envCheckGraphics',
	'envCheckGit',
	'envCheckServer',
	'envCheckPath',
	'envCheckUploadsDirectory',
	'envCheckUploadsServerResponse',
	'envCheck64Bit',
	];

	/**
	* A list of environment preparation methods called by doEnvironmentPreps().
	*
	* @var array
	*/
	protected $envPreps = [
	'envPrepServer',
	'envPrepPath',
	];

	/**
	* MediaWiki configuration globals that will eventually be passed through
	* to LocalSettings.php. The names only are given here, the defaults
	* typically come from config-schema.yaml.
	*/
	private const DEFAULT_VAR_NAMES = [
	MainConfigNames::Sitename,
	MainConfigNames::PasswordSender,
	MainConfigNames::LanguageCode,
	MainConfigNames::Localtimezone,
	MainConfigNames::RightsIcon,
	MainConfigNames::RightsText,
	MainConfigNames::RightsUrl,
	MainConfigNames::EnableEmail,
	MainConfigNames::EnableUserEmail,
	MainConfigNames::EnotifUserTalk,
	MainConfigNames::EnotifWatchlist,
	MainConfigNames::EmailAuthentication,
	MainConfigNames::DBname,
	MainConfigNames::DBtype,
	MainConfigNames::Diff3,
	MainConfigNames::ImageMagickConvertCommand,
	MainConfigNames::GitBin,
	MainConfigNames::ScriptPath,
	MainConfigNames::MetaNamespace,
	MainConfigNames::DeletedDirectory,
	MainConfigNames::EnableUploads,
	MainConfigNames::SecretKey,
	MainConfigNames::UseInstantCommons,
	MainConfigNames::UpgradeKey,
	MainConfigNames::DefaultSkin,
	MainConfigNames::Pingback,
	];

	/**
	* Variables that are stored alongside globals, and are used for any
	* configuration of the installation process aside from the MediaWiki
	* configuration. Map of names to defaults.
	*
	* @var array
	*/
	protected $internalDefaults = [
	'_UserLang' => 'en',
	'_Environment' => false,
	'_RaiseMemory' => false,
	'_UpgradeDone' => false,
	'_InstallDone' => false,
	'_Caches' => [],
	'_InstallPassword' => '',
	'_SameAccount' => true,
	'_CreateDBAccount' => false,
	'_NamespaceType' => 'site-name',
	'_AdminName' => '', // will be set later, when the user selects language
	'_AdminPassword' => '',
	'_AdminPasswordConfirm' => '',
	'_AdminEmail' => '',
	'_Subscribe' => false,
	'_SkipOptional' => 'continue',
	'_RightsProfile' => 'wiki',
	'_LicenseCode' => 'none',
	'_CCDone' => false,
	'_Extensions' => [],
	'_Skins' => [],
	'_MemCachedServers' => '',
	'_UpgradeKeySupplied' => false,
	'_ExistingDBSettings' => false,
	'_LogoWordmark' => '',
	'_LogoWordmarkWidth' => 119,
	'_LogoWordmarkHeight' => 18,
	// Single quotes are intentional, LocalSettingsGenerator must output this unescaped.
	'_Logo1x' => '$wgResourceBasePath/resources/assets/change-your-logo.svg',
	'_LogoIcon' => '$wgResourceBasePath/resources/assets/change-your-logo-icon.svg',
	'_LogoTagline' => '',
	'_LogoTaglineWidth' => 117,
	'_LogoTaglineHeight' => 13,
	'_WithDevelopmentSettings' => false,
	'wgAuthenticationTokenVersion' => 1,
	];

	/**
	* The actual list of installation steps. This will be initialized by getInstallSteps()
	*
	* @var array[]
	* @phan-var array<int,array{name:string,callback:array{0:object,1:string}}>
	*/
	private $installSteps = [];

	/**
	* Extra steps for installation, for things like DatabaseInstallers to modify
	*
	* @var array
	*/
	protected $extraInstallSteps = [];

	/**
	* Known object cache types and the functions used to test for their existence.
	*
	* @var array
	*/
	protected $objectCaches = [
	'apcu' => 'apcu_fetch',
	];

	/**
	* User rights profiles.
	*
	* @var array
	*/
	public $rightsProfiles = [
	'wiki' => [],
	'no-anon' => [
	'*' => [ 'edit' => false ]
	],
	'fishbowl' => [
	'*' => [
	'createaccount' => false,
	'edit' => false,
	],
	],
	'private' => [
	'*' => [
	'createaccount' => false,
	'edit' => false,
	'read' => false,
	],
	],
	];

	/**
	* License types.
	*
	* @var array
	*/
	public $licenses = [
	'cc-by' => [
	'url' => 'https://creativecommons.org/licenses/by/4.0/',
	'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by.png',
	],
	'cc-by-sa' => [
	'url' => 'https://creativecommons.org/licenses/by-sa/4.0/',
	'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-sa.png',
	],
	'cc-by-nc-sa' => [
	'url' => 'https://creativecommons.org/licenses/by-nc-sa/4.0/',
	'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-by-nc-sa.png',
	],
	'cc-0' => [
	'url' => 'https://creativecommons.org/publicdomain/zero/1.0/',
	'icon' => '$wgResourceBasePath/resources/assets/licenses/cc-0.png',
	],
	'gfdl' => [
	'url' => 'https://www.gnu.org/copyleft/fdl.html',
	'icon' => '$wgResourceBasePath/resources/assets/licenses/gnu-fdl.png',
	],
	'none' => [
	'url' => '',
	'icon' => '',
	'text' => ''
	],
	];

	/**
	* @var HookContainer\|null
	*/
	protected $autoExtensionHookContainer;
	protected array $virtualDomains = [];

	/**
	* Display a short neutral message
	*
	* @param string\|MessageSpecifier $msg String of wikitext that will be converted
	* to HTML, or interface message that will be parsed.
	* @param mixed ...$params
	*/
	abstract public function showMessage( $msg, ...$params );

	/**
	* Display a success message
	*
	* @param string\|MessageSpecifier $msg String of wikitext that will be converted
	* to HTML, or interface message that will be parsed.
	* @param string\|int\|float ...$params Message parameters, same as wfMessage().
	*/
	abstract public function showSuccess( $msg, ...$params );

	/**
	* Display a warning message
	*
	* @param string\|MessageSpecifier $msg String of wikitext that will be converted
	* to HTML, or interface message that will be parsed.
	* @param string\|int\|float ...$params Message parameters, same as wfMessage().
	*/
	abstract public function showWarning( $msg, ...$params );

	/**
	* Display an error message
	*
	* Avoid error fatigue in the installer. Use this only if something the
	* user expects has failed and requires intervention to continue.
	* If something non-essential failed that can be continued past with
	* no action, use a warning instead.
	*
	* @param string\|MessageSpecifier $msg
	* @param mixed ...$params
	*/
	abstract public function showError( $msg, ...$params );

	/**
	* Show a message to the installing user by using a Status object
	* @param Status $status
	*/
	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::class ];

	$objectCaches = [
	CACHE_NONE => $emptyCache,
	CACHE_DB => $emptyCache,
	CACHE_ANYTHING => $emptyCache,
	CACHE_MEMCACHED => $emptyCache,
	] + $baseConfig->get( MainConfigNames::ObjectCaches );

	$configOverrides->set( MainConfigNames::ObjectCaches, $objectCaches );

	// Load the installer's i18n.
	$messageDirs = $baseConfig->get( MainConfigNames::MessagesDirs );
	$messageDirs['MediaWikiInstaller'] = __DIR__ . '/i18n';

	$configOverrides->set( MainConfigNames::MessagesDirs, $messageDirs );

	$installerConfig = new MultiConfig( [ $configOverrides, $baseConfig ] );

	// make sure we use the installer config as the main config
	$configRegistry = $baseConfig->get( MainConfigNames::ConfigRegistry );
	$configRegistry['main'] = static function () use ( $installerConfig ) {
	return $installerConfig;
	};

	$configOverrides->set( MainConfigNames::ConfigRegistry, $configRegistry );

	return $installerConfig;
	}

	/**
	* Constructor, always call this from child classes.
	*/
	public function __construct() {
	$defaultConfig = new GlobalVarConfig(); // all the defaults from config-schema.yaml.
	$installerConfig = self::getInstallerConfig( $defaultConfig );

	// Disable all storage services, since we don't have any configuration yet!
	$this->resetMediaWikiServices( $installerConfig, [], true );

	$this->settings = $this->getDefaultSettings();

	$this->doEnvironmentPreps();

	$this->compiledDBs = [];
	foreach ( self::getDBTypes() as $type ) {
	$installer = $this->getDBInstaller( $type );

	if ( !$installer->isCompiled() ) {
	continue;
	}
	$this->compiledDBs[] = $type;
	}

	$this->parserTitle = Title::newFromText( 'Installer' );
	}

	/**
	* @return array
	*/
	private function getDefaultSettings(): array {
	global $wgLocaltimezone;

	$ret = $this->internalDefaults;

	foreach ( self::DEFAULT_VAR_NAMES as $name ) {
	$var = "wg{$name}";
	$ret[$var] = MainConfigSchema::getDefaultValue( $name );
	}

	// Set $wgLocaltimezone to the value of the global, which SetupDynamicConfig.php will have
	// set to something that is a valid timezone.
	$ret['wgLocaltimezone'] = $wgLocaltimezone;

	return $ret;
	}

	/**
	* Reset the global service container and associated global state
	* to accommodate different stages of the installation.
	* @since 1.35
	*
	* @param Config\|null $installerConfig Config override. If null, the previous
	* config will be inherited.
	* @param array $serviceOverrides Service definition overrides. Values can be null to
	* disable specific overrides that would be applied by default, namely
	* 'InterwikiLookup' and 'UserOptionsLookup'.
	* @param bool $disableStorage Whether MediaWikiServices::disableStorage() should be called.
	*
	* @return MediaWikiServices
	*/
	public function resetMediaWikiServices(
	?Config $installerConfig = null,
	$serviceOverrides = [],
	bool $disableStorage = false
	) {
	global $wgObjectCaches, $wgLang;

	// Reset all services and inject config overrides.
	// NOTE: This will reset existing instances, but not previous wiring overrides!
	MediaWikiServices::resetGlobalInstance( $installerConfig );

	$mwServices = MediaWikiServices::getInstance();

	if ( $disableStorage ) {
	$mwServices->disableStorage();
	} else {
	// Default to partially disabling services.

	$serviceOverrides += [
	// Disable interwiki lookup, to avoid database access during parses
	'InterwikiLookup' => static function () {
	return new NullInterwikiLookup();
	},

	// Disable user options database fetching, only rely on default options.
	'UserOptionsLookup' => static function ( MediaWikiServices $services ) {
	return new StaticUserOptionsLookup(
	[],
	$services->getMainConfig()->get( MainConfigNames::DefaultUserOptions )
	);
	},

	// Restore to default wiring, in case it was overwritten by disableStorage()
	'DBLoadBalancer' => static function ( MediaWikiServices $services ) {
	return $services->getDBLoadBalancerFactory()->getMainLB();
	},
	];
	}

	$lang = $this->getVar( '_UserLang', 'en' );

	foreach ( $serviceOverrides as $name => $callback ) {
	// Skip if the caller set $callback to null
	// to suppress default overrides.
	if ( $callback ) {
	$mwServices->redefineService( $name, $callback );
	}
	}

	// Disable i18n cache
	$mwServices->getLocalisationCache()->disableBackend();

	// Set a fake user.
	// Note that this will reset the context's language,
	// so set the user before setting the language.
	$user = User::newFromId( 0 );
	StubGlobalUser::setUser( $user );

	RequestContext::getMain()->setUser( $user );

	// Don't attempt to load user language options (T126177)
	// This will be overridden in the web installer with the user-specified language
	// Ensure $wgLang does not have a reference to a stale LocalisationCache instance
	// (T241638, T261081)
	RequestContext::getMain()->setLanguage( $lang );
	$wgLang = RequestContext::getMain()->getLanguage();

	// Disable object cache (otherwise CACHE_ANYTHING will try CACHE_DB and
	// SqlBagOStuff will then throw since we just disabled wfGetDB)
	$wgObjectCaches = $mwServices->getMainConfig()->get( MainConfigNames::ObjectCaches );

	$this->parserOptions = new ParserOptions( $user ); // language will be wrong :(
	// Don't try to access DB before user language is initialised
	$this->setParserLanguage( $mwServices->getLanguageFactory()->getLanguage( 'en' ) );

	return $mwServices;
	}

	/**
	* Get a list of known DB types.
	*
	* @return array
	*/
	public static function getDBTypes() {
	return self::$dbTypes;
	}

	/**
	* Do initial checks of the PHP environment. Set variables according to
	* the observed environment.
	*
	* It's possible that this may be called under the CLI SAPI, not the SAPI
	* that the wiki will primarily run under. In that case, the subclass should
	* initialise variables such as wgScriptPath, before calling this function.
	*
	* It can already be assumed that a supported PHP version is in use. Under
	* the web subclass, it can also be assumed that sessions are working.
	*
	* @return Status
	*/
	public function doEnvironmentChecks() {
	// PHP version has already been checked by entry scripts
	// Show message here for information purposes
	$this->showMessage( 'config-env-php', PHP_VERSION );

	$good = true;
	foreach ( $this->envChecks as $check ) {
	$status = $this->$check();
	if ( $status === false ) {
	$good = false;
	}
	}

	$this->setVar( '_Environment', $good );

	return $good ? Status::newGood() : Status::newFatal( 'config-env-bad' );
	}

	public function doEnvironmentPreps() {
	foreach ( $this->envPreps as $prep ) {
	$this->$prep();
	}
	}

	/**
	* Set a MW configuration variable, or internal installer configuration variable.
	*
	* @param string $name
	* @param mixed $value
	*/
	public function setVar( $name, $value ) {
	$this->settings[$name] = $value;
	}

	/**
	* Get an MW configuration variable, or internal installer configuration variable.
	* The defaults come from MainConfigSchema.
	* Installer variables are typically prefixed by an underscore.
	*
	* @param string $name
	* @param mixed\|null $default
	*
	* @return mixed
	*/
	public function getVar( $name, $default = null ) {
	return $this->settings[$name] ?? $default;
	}

	/**
	* Get a list of DBs supported by current PHP setup
	*
	* @return array
	*/
	public function getCompiledDBs() {
	return $this->compiledDBs;
	}

	/**
	* Get the DatabaseInstaller class name for this type
	*
	* @param string $type database type ($wgDBtype)
	* @return string Class name
	* @since 1.30
	*/
	public static function getDBInstallerClass( $type ) {
	return '\\MediaWiki\\Installer\\' . ucfirst( $type ) . 'Installer';
	}

	/**
	* Get an instance of DatabaseInstaller for the specified DB type.
	*
	* @param mixed $type DB installer for which is needed, false to use default.
	*
	* @return DatabaseInstaller
	*/
	public function getDBInstaller( $type = false ) {
	if ( !$type ) {
	$type = $this->getVar( 'wgDBtype' );
	}

	$type = strtolower( $type );

	if ( !isset( $this->dbInstallers[$type] ) ) {
	$class = self::getDBInstallerClass( $type );
	$this->dbInstallers[$type] = new $class( $this );
	}

	return $this->dbInstallers[$type];
	}

	/**
	* Determine if LocalSettings.php exists. If it does, return its variables.
	*
	* @return array\|false
	*/
	public static function getExistingLocalSettings() {
	$IP = wfDetectInstallPath();

	// You might be wondering why this is here. Well if you don't do this
	// then some poorly-formed extensions try to call their own classes
	// after immediately registering them. We really need to get extension
	// registration out of the global scope and into a real format.
	// @see https://phabricator.wikimedia.org/T69440
	global $wgAutoloadClasses;
	$wgAutoloadClasses = [];

	// LocalSettings.php should not call functions, except wfLoadSkin/wfLoadExtensions
	// Define the required globals here, to ensure, the functions can do it work correctly.
	// phpcs:ignore MediaWiki.VariableAnalysis.UnusedGlobalVariables
	global $wgExtensionDirectory, $wgStyleDirectory;

	// This will also define MW_CONFIG_FILE
	$lsFile = wfDetectLocalSettingsFile( $IP );
	// phpcs:ignore Generic.PHP.NoSilencedErrors
	$lsExists = @file_exists( $lsFile );

	if ( !$lsExists ) {
	return false;
	}

	if ( !str_ends_with( $lsFile, '.php' ) ) {
	throw new RuntimeException(
	'The installer cannot yet handle non-php settings files: ' . $lsFile . '. ' .
	'Use `php maintenance/run.php update` to update an existing installation.'
	);
	}
	unset( $lsExists );

	// Extract the defaults into the current scope
	foreach ( MainConfigSchema::listDefaultValues( 'wg' ) as $var => $value ) {
	$$var = $value;
	}

	$wgExtensionDirectory = "$IP/extensions";
	$wgStyleDirectory = "$IP/skins";

	// NOTE: To support YAML settings files, this needs to start using SettingsBuilder.
	// However, as of 1.38, YAML settings files are still experimental and
	// SettingsBuilder is still unstable. For now, the installer will fail if
	// the existing settings file is not PHP. The updater should still work though.
	// NOTE: When adding support for YAML settings file, all references to LocalSettings.php
	// in localisation messages need to be replaced.
	// NOTE: This assumes simple variable assignments. More complex setups may involve
	// settings coming from sub-required and/or functions that assign globals
	// directly. This is fine here because this isn't used as the "real" include.
	// It is only used for reading out a small set of variables that the installer
	// validates and/or displays.
	require $lsFile;

	return get_defined_vars();
	}

	/**
	* Get a fake password for sending back to the user in HTML.
	* This is a security mechanism to avoid compromise of the password in the
	* event of session ID compromise.
	*
	* @param string $realPassword
	*
	* @return string
	*/
	public function getFakePassword( $realPassword ) {
	return str_repeat( '*', strlen( $realPassword ) );
	}

	/**
	* Set a variable which stores a password, except if the new value is a
	* fake password in which case leave it as it is.
	*
	* @param string $name
	* @param mixed $value
	*/
	public function setPassword( $name, $value ) {
	if ( !preg_match( '/^\*+$/', $value ) ) {
	$this->setVar( $name, $value );
	}
	}

	/**
	* On POSIX systems return the primary group of the webserver we're running under.
	* On other systems just returns null.
	*
	* This is used to advice the user that he should chgrp his mw-config/data/images directory as the
	* webserver user before he can install.
	*
	* Public because SqliteInstaller needs it, and doesn't subclass Installer.
	*
	* @return mixed
	*/
	public static function maybeGetWebserverPrimaryGroup() {
	if ( !function_exists( 'posix_getegid' ) \|\| !function_exists( 'posix_getpwuid' ) ) {
	# I don't know this, this isn't UNIX.
	return null;
	}

	# posix_getegid() not getmygid() because we want the group of the webserver,
	# not whoever owns the current script.
	$gid = posix_getegid();
	return posix_getpwuid( $gid )['name'] ?? null;
	}

	/**
	* Convert wikitext $text to HTML.
	*
	* This is potentially error prone since many parser features require a complete
	* installed MW database. The solution is to just not use those features when you
	* write your messages. This appears to work well enough. Basic formatting and
	* external links work just fine.
	*
	* But in case a translator decides to throw in a "#ifexist" or internal link or
	* whatever, this function is guarded to catch the attempted DB access and to present
	* some fallback text.
	*
	* @param string $text
	* @param bool $lineStart
	* @return string
	*/
	public function parse( $text, $lineStart = false ) {
	$parser = MediaWikiServices::getInstance()->getParser();

	try {
	$out = $parser->parse( $text, $this->parserTitle, $this->parserOptions, $lineStart );
	$pipeline = MediaWikiServices::getInstance()->getDefaultOutputPipeline();
	// TODO T371008 consider if using the Content framework makes sense instead of creating the pipeline
	$html = $pipeline->run( $out, $this->parserOptions, [
	'enableSectionEditLinks' => false,
	'unwrap' => true,
	] )->getContentHolderText();
	$html = Parser::stripOuterParagraph( $html );
	} catch ( ServiceDisabledException $e ) {
	$html = '<!--DB access attempted during parse--> ' . htmlspecialchars( $text );
	}

	return $html;
	}

	/**
	* @return ParserOptions
	*/
	public function getParserOptions() {
	return $this->parserOptions;
	}

	public function disableLinkPopups() {
	// T317647: This ParserOptions method is deprecated; we should be
	// updating ExternalLinkTarget in the Configuration instead.
	$this->parserOptions->setExternalLinkTarget( false );
	}

	public function restoreLinkPopups() {
	// T317647: This ParserOptions method is deprecated; we should be
	// updating ExternalLinkTarget in the Configuration instead.
	global $wgExternalLinkTarget;
	$this->parserOptions->setExternalLinkTarget( $wgExternalLinkTarget );
	}

	/**
	* Install step which adds a row to the site_stats table with appropriate
	* initial values.
	*
	* @param DatabaseInstaller $installer
	*
	* @return Status
	*/
	public function populateSiteStats( DatabaseInstaller $installer ) {
	$status = $installer->getConnection( DatabaseInstaller::CONN_CREATE_TABLES );
	if ( !$status->isOK() ) {
	return $status;
	}
	$status->getDB()->newInsertQueryBuilder()
	->insertInto( 'site_stats' )
	->ignore()
	->row( [
	'ss_row_id' => 1,
	'ss_total_edits' => 0,
	'ss_good_articles' => 0,
	'ss_total_pages' => 0,
	'ss_users' => 0,
	'ss_active_users' => 0,
	'ss_images' => 0
	] )
	->caller( __METHOD__ )
	->execute();

	return Status::newGood();
	}

	/**
	* Environment check for DB types.
	* @return bool
	*/
	protected function envCheckDB() {
	global $wgLang;
	/** @var string\|null $dbType The user-specified database type */
	$dbType = $this->getVar( 'wgDBtype' );

	$allNames = [];

	// Messages: config-type-mysql, config-type-postgres, config-type-sqlite
	foreach ( self::getDBTypes() as $name ) {
	$allNames[] = wfMessage( "config-type-$name" )->text();
	}

	$databases = $this->getCompiledDBs();

	$databases = array_flip( $databases );
	$ok = true;
	foreach ( $databases as $db => $_ ) {
	$installer = $this->getDBInstaller( $db );
	$status = $installer->checkPrerequisites();
	if ( !$status->isGood() ) {
	if ( !$this instanceof WebInstaller && $db === $dbType ) {
	// Strictly check the key database type instead of just outputting message
	// Note: No perform this check run from the web installer, since this method always called by
	// the welcome page under web installation, so $dbType will always be 'mysql'
	$ok = false;
	}
	$this->showStatusMessage( $status );
	unset( $databases[$db] );
	}
	}
	$databases = array_flip( $databases );
	if ( !$databases ) {
	$this->showError( 'config-no-db', $wgLang->commaList( $allNames ), count( $allNames ) );
	return false;
	}
	return $ok;
	}

	/**
	* Check for known PCRE-related compatibility issues.
	*
	* @note We don't bother checking for Unicode support here. If it were
	* missing, the parser would probably throw an exception before the
	* result of this check is shown to the user.
	*
	* @return bool
	*/
	protected function envCheckPCRE() {
	// PCRE2 must be compiled using NEWLINE_DEFAULT other than 4 (ANY);
	// otherwise, it will misidentify UTF-8 trailing byte value 0x85
	// as a line ending character when in non-UTF mode.
	if ( preg_match( '/^b.*c$/', 'bąc' ) === 0 ) {
	$this->showError( 'config-pcre-invalid-newline' );
	return false;
	}
	return true;
	}

	/**
	* Environment check for available memory.
	* @return bool
	*/
	protected function envCheckMemory() {
	$limit = ini_get( 'memory_limit' );

	if ( !$limit \|\| $limit == -1 ) {
	return true;
	}

	$n = wfShorthandToInteger( $limit );

	if ( $n < $this->minMemorySize * 1024 * 1024 ) {
	$newLimit = "{$this->minMemorySize}M";

	if ( ini_set( "memory_limit", $newLimit ) === false ) {
	$this->showMessage( 'config-memory-bad', $limit );
	} else {
	$this->showMessage( 'config-memory-raised', $limit, $newLimit );
	$this->setVar( '_RaiseMemory', true );
	}
	}

	return true;
	}

	/**
	* Environment check for compiled object cache types.
	*/
	protected function envCheckCache() {
	$caches = [];
	foreach ( $this->objectCaches as $name => $function ) {
	if ( function_exists( $function ) ) {
	$caches[$name] = true;
	}
	}

	if ( !$caches ) {
	$this->showMessage( 'config-no-cache-apcu' );
	}

	$this->setVar( '_Caches', $caches );
	}

	/**
	* Scare user to death if they have mod_security or mod_security2
	* @return bool
	*/
	protected function envCheckModSecurity() {
	if ( self::apacheModulePresent( 'mod_security' )
	\|\| self::apacheModulePresent( 'mod_security2' ) ) {
	$this->showMessage( 'config-mod-security' );
	}

	return true;
	}

	/**
	* Search for GNU diff3.
	* @return bool
	*/
	protected function envCheckDiff3() {
	$names = [ "gdiff3", "diff3" ];
	if ( wfIsWindows() ) {
	$names[] = 'diff3.exe';
	}
	$versionInfo = [ '--version', 'GNU diffutils' ];

	$diff3 = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );

	if ( $diff3 ) {
	$this->setVar( 'wgDiff3', $diff3 );
	} else {
	$this->setVar( 'wgDiff3', false );
	$this->showMessage( 'config-diff3-bad' );
	}

	return true;
	}

	/**
	* Environment check for ImageMagick and GD.
	* @return bool
	*/
	protected function envCheckGraphics() {
	$names = wfIsWindows() ? 'convert.exe' : 'convert';
	$versionInfo = [ '-version', 'ImageMagick' ];
	$convert = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );

	$this->setVar( 'wgImageMagickConvertCommand', '' );
	if ( $convert ) {
	$this->setVar( 'wgImageMagickConvertCommand', $convert );
	$this->showMessage( 'config-imagemagick', $convert );
	} elseif ( function_exists( 'imagejpeg' ) ) {
	$this->showMessage( 'config-gd' );
	} else {
	$this->showMessage( 'config-no-scaling' );
	}

	return true;
	}

	/**
	* Search for git.
	*
	* @since 1.22
	* @return bool
	*/
	protected function envCheckGit() {
	$names = wfIsWindows() ? 'git.exe' : 'git';
	$versionInfo = [ '--version', 'git version' ];

	$git = ExecutableFinder::findInDefaultPaths( $names, $versionInfo );

	if ( $git ) {
	$this->setVar( 'wgGitBin', $git );
	$this->showMessage( 'config-git', $git );
	} else {
	$this->setVar( 'wgGitBin', false );
	$this->showMessage( 'config-git-bad' );
	}

	return true;
	}

	/**
	* Environment check to inform user which server we've assumed.
	*
	* @return bool
	*/
	protected function envCheckServer() {
	$server = $this->envGetDefaultServer();
	if ( $server !== null ) {
	$this->showMessage( 'config-using-server', $server );
	}
	return true;
	}

	/**
	* Environment check to inform user which paths we've assumed.
	*
	* @return bool
	*/
	protected function envCheckPath() {
	$this->showMessage(
	'config-using-uri',
	$this->getVar( 'wgServer' ),
	$this->getVar( 'wgScriptPath' )
	);
	return true;
	}

	/**
	* Environment check for the permissions of the uploads directory
	* @return bool
	*/
	protected function envCheckUploadsDirectory() {
	global $IP;

	$dir = $IP . '/images/';
	$url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/';
	$safe = !$this->dirIsExecutable( $dir, $url );

	if ( !$safe ) {
	$this->showWarning( 'config-uploads-not-safe', $dir );
	}

	return true;
	}

	protected function envCheckUploadsServerResponse() {
	$url = $this->getVar( 'wgServer' ) . $this->getVar( 'wgScriptPath' ) . '/images/README';
	$httpRequestFactory = MediaWikiServices::getInstance()->getHttpRequestFactory();
	$status = null;

	$req = $httpRequestFactory->create(
	$url,
	[
	'method' => 'GET',
	'timeout' => 3,
	'followRedirects' => true
	],
	__METHOD__
	);
	try {
	$status = $req->execute();
	} catch ( Exception $e ) {
	// HttpRequestFactory::get can throw with allow_url_fopen = false and no curl
	// extension.
	}

	if ( !$status \|\| !$status->isGood() ) {
	$this->showWarning( 'config-uploads-security-requesterror', 'X-Content-Type-Options: nosniff' );
	return true;
	}

	$headerValue = $req->getResponseHeader( 'X-Content-Type-Options' ) ?? '';
	$responseList = Header::splitList( $headerValue );
	if ( !in_array( 'nosniff', $responseList, true ) ) {
	$this->showWarning( 'config-uploads-security-headers', 'X-Content-Type-Options: nosniff' );
	}

	return true;
	}

	/**
	* Checks if we're running on 64 bit or not. 32 bit is becoming increasingly
	* hard to support, so let's at least warn people.
	*
	* @return bool
	*/
	protected function envCheck64Bit() {
	if ( PHP_INT_SIZE == 4 ) {
	$this->showMessage( 'config-using-32bit' );
	}

	return true;
	}

	/**
	* Check and display the libicu and Unicode versions
	*/
	protected function envCheckLibicu() {
	$unicodeVersion = implode( '.', array_slice( IntlChar::getUnicodeVersion(), 0, 3 ) );
	$this->showMessage( 'config-env-icu', INTL_ICU_VERSION, $unicodeVersion );
	}

	/**
	* Environment prep for the server hostname.
	*/
	protected function envPrepServer() {
	$server = $this->envGetDefaultServer();
	if ( $server !== null ) {
	$this->setVar( 'wgServer', $server );
	}
	}

	/**
	* Helper function to be called from envPrepServer()
	* @return string
	*/
	abstract protected function envGetDefaultServer();

	/**
	* Environment prep for setting $IP and $wgScriptPath.
	*/
	protected function envPrepPath() {
	global $IP;
	$IP = dirname( dirname( __DIR__ ) );
	$this->setVar( 'IP', $IP );
	}

	/**
	* Checks if scripts located in the given directory can be executed via the given URL.
	*
	* Used only by environment checks.
	* @param string $dir
	* @param string $url
	* @return bool\|int\|string
	*/
	public function dirIsExecutable( $dir, $url ) {
	$scriptTypes = [
	'php' => [
	"<?php echo 'exec';",
	"#!/var/env php\n<?php echo 'exec';",
	],
	];

	// it would be good to check other popular languages here, but it'll be slow.
	// TODO no need to have a loop if there is going to only be one script type

	$httpRequestFactory = MediaWikiServices::getInstance()->getHttpRequestFactory();

	AtEase::suppressWarnings();

	foreach ( $scriptTypes as $ext => $contents ) {
	foreach ( $contents as $source ) {
	$file = 'exectest.' . $ext;

	if ( !file_put_contents( $dir . $file, $source ) ) {
	break;
	}

	try {
	$text = $httpRequestFactory->get(
	$url . $file,
	[ 'timeout' => 3 ],
	__METHOD__
	);
	} catch ( Exception $e ) {
	// HttpRequestFactory::get can throw with allow_url_fopen = false and no curl
	// extension.
	$text = null;
	}
	unlink( $dir . $file );

	if ( $text == 'exec' ) {
	AtEase::restoreWarnings();

	return $ext;
	}
	}
	}

	AtEase::restoreWarnings();

	return false;
	}

	/**
	* Checks for presence of an Apache module. Works only if PHP is running as an Apache module, too.
	*
	* @param string $moduleName Name of module to check.
	* @return bool
	*/
	public static function apacheModulePresent( $moduleName ) {
	if ( function_exists( 'apache_get_modules' ) && in_array( $moduleName, apache_get_modules() ) ) {
	return true;
	}
	// try it the hard way
	ob_start();
	phpinfo( INFO_MODULES );
	$info = ob_get_clean();

	return strpos( $info, $moduleName ) !== false;
	}

	/**
	* ParserOptions are constructed before we determined the language, so fix it
	*
	* @param Language $lang
	*/
	public function setParserLanguage( $lang ) {
	$this->parserOptions->setTargetLanguage( $lang );
	$this->parserOptions->setUserLang( $lang );
	}

	/**
	* Overridden by WebInstaller to provide lastPage parameters.
	* @param string $page
	* @return string
	*/
	protected function getDocUrl( $page ) {
	return "{$_SERVER['PHP_SELF']}?page=" . urlencode( $page );
	}

	/**
	* Find extensions or skins in a subdirectory of $IP.
	* Returns an array containing the value for 'Name' for each found extension.
	*
	* @param string $directory Directory to search in, relative to $IP, must be either "extensions"
	* or "skins"
	* @return Status An object containing an error list. If there were no errors, an associative
	* array of information about the extension can be found in $status->value.
	*/
	public function findExtensions( $directory = 'extensions' ) {
	switch ( $directory ) {
	case 'extensions':
	return $this->findExtensionsByType( 'extension', 'extensions' );
	case 'skins':
	return $this->findExtensionsByType( 'skin', 'skins' );
	default:
	throw new InvalidArgumentException( "Invalid extension type" );
	}
	}

	/**
	* Find extensions or skins, and return an array containing the value for 'Name' for each found
	* extension.
	*
	* @param string $type Either "extension" or "skin"
	* @param string $directory Directory to search in, relative to $IP
	* @return Status An object containing an error list. If there were no errors, an associative
	* array of information about the extension can be found in $status->value.
	*/
	protected function findExtensionsByType( $type = 'extension', $directory = 'extensions' ) {
	if ( $this->getVar( 'IP' ) === null ) {
	return Status::newGood( [] );
	}

	$extDir = $this->getVar( 'IP' ) . '/' . $directory;
	if ( !is_readable( $extDir ) \|\| !is_dir( $extDir ) ) {
	return Status::newGood( [] );
	}

	$dh = opendir( $extDir );
	$exts = [];
	$status = new Status;
	// phpcs:ignore Generic.CodeAnalysis.AssignmentInCondition.FoundInWhileCondition
	while ( ( $file = readdir( $dh ) ) !== false ) {
	// skip non-dirs and hidden directories
	if ( !is_dir( "$extDir/$file" ) \|\| $file[0] === '.' ) {
	continue;
	}
	$extStatus = $this->getExtensionInfo( $type, $directory, $file );
	if ( $extStatus->isOK() ) {
	$exts[$file] = $extStatus->value;
	} elseif ( $extStatus->hasMessage( 'config-extension-not-found' ) ) {
	// (T225512) The directory is not actually an extension. Downgrade to warning.
	$status->warning( 'config-extension-not-found', $file );
	} else {
	$status->merge( $extStatus );
	}
	}
	closedir( $dh );
	uksort( $exts, 'strnatcasecmp' );

	$status->value = $exts;

	return $status;
	}

	/**
	* @param string $type Either "extension" or "skin"
	* @param string $parentRelPath The parent directory relative to $IP
	* @param string $name The extension or skin name
	* @return Status An object containing an error list. If there were no errors, an associative
	* array of information about the extension can be found in $status->value.
	*/
	protected function getExtensionInfo( $type, $parentRelPath, $name ) {
	if ( $this->getVar( 'IP' ) === null ) {
	throw new RuntimeException( 'Cannot find extensions since the IP variable is not yet set' );
	}
	if ( $type !== 'extension' && $type !== 'skin' ) {
	throw new InvalidArgumentException( "Invalid extension type" );
	}
	$absDir = $this->getVar( 'IP' ) . "/$parentRelPath/$name";
	$relDir = "../$parentRelPath/$name";
	if ( !is_dir( $absDir ) ) {
	return Status::newFatal( 'config-extension-not-found', $name );
	}
	$jsonFile = $type . '.json';
	$fullJsonFile = "$absDir/$jsonFile";
	$isJson = file_exists( $fullJsonFile );
	$isPhp = false;
	if ( !$isJson ) {
	// Only fallback to PHP file if JSON doesn't exist
	$fullPhpFile = "$absDir/$name.php";
	$isPhp = file_exists( $fullPhpFile );
	}
	if ( !$isJson && !$isPhp ) {
	return Status::newFatal( 'config-extension-not-found', $name );
	}

	// Extension exists. Now see if there are screenshots
	$info = [];
	if ( is_dir( "$absDir/screenshots" ) ) {
	$paths = glob( "$absDir/screenshots/*.png" );
	foreach ( $paths as $path ) {
	$info['screenshots'][] = str_replace( $absDir, $relDir, $path );
	}
	}

	if ( $isJson ) {
	$jsonStatus = $this->readExtension( $fullJsonFile );
	if ( !$jsonStatus->isOK() ) {
	return $jsonStatus;
	}
	$info += $jsonStatus->value;
	}

	return Status::newGood( $info );
	}

	/**
	* @param string $fullJsonFile
	* @param array $extDeps
	* @param array $skinDeps
	*
	* @return Status On success, an array of extension information is in $status->value. On
	* failure, the Status object will have an error list.
	*/
	private function readExtension( $fullJsonFile, $extDeps = [], $skinDeps = [] ) {
	$load = [
	$fullJsonFile => 1
	];
	if ( $extDeps ) {
	$extDir = $this->getVar( 'IP' ) . '/extensions';
	foreach ( $extDeps as $dep ) {
	$fname = "$extDir/$dep/extension.json";
	if ( !file_exists( $fname ) ) {
	return Status::newFatal( 'config-extension-not-found', $dep );
	}
	$load[$fname] = 1;
	}
	}
	if ( $skinDeps ) {
	$skinDir = $this->getVar( 'IP' ) . '/skins';
	foreach ( $skinDeps as $dep ) {
	$fname = "$skinDir/$dep/skin.json";
	if ( !file_exists( $fname ) ) {
	return Status::newFatal( 'config-extension-not-found', $dep );
	}
	$load[$fname] = 1;
	}
	}
	$registry = new ExtensionRegistry();
	try {
	$info = $registry->readFromQueue( $load );
	} catch ( ExtensionDependencyError $e ) {
	if ( $e->incompatibleCore \|\| $e->incompatibleSkins
	\|\| $e->incompatibleExtensions
	) {
	// If something is incompatible with a dependency, we have no real
	// option besides skipping it
	return Status::newFatal( 'config-extension-dependency',
	basename( dirname( $fullJsonFile ) ), $e->getMessage() );
	} elseif ( $e->missingExtensions \|\| $e->missingSkins ) {
	// There's an extension missing in the dependency tree,
	// so add those to the dependency list and try again
	$status = $this->readExtension(
	$fullJsonFile,
	array_merge( $extDeps, $e->missingExtensions ),
	array_merge( $skinDeps, $e->missingSkins )
	);
	if ( !$status->isOK() && !$status->hasMessage( 'config-extension-dependency' ) ) {
	$status = Status::newFatal( 'config-extension-dependency',
	basename( dirname( $fullJsonFile ) ), $status->getMessage() );
	}
	return $status;
	}
	// Some other kind of dependency error?
	return Status::newFatal( 'config-extension-dependency',
	basename( dirname( $fullJsonFile ) ), $e->getMessage() );
	}
	$ret = [];
	// The order of credits will be the order of $load,
	// so the first extension is the one we want to load,
	// everything else is a dependency
	$i = 0;
	foreach ( $info['credits'] as $credit ) {
	$i++;
	if ( $i == 1 ) {
	// Extension we want to load
	continue;
	}
	$type = basename( $credit['path'] ) === 'skin.json' ? 'skins' : 'extensions';
	$ret['requires'][$type][] = $credit['name'];
	}
	$credits = array_values( $info['credits'] )[0];
	if ( isset( $credits['url'] ) ) {
	$ret['url'] = $credits['url'];
	}
	$ret['type'] = $credits['type'];

	return Status::newGood( $ret );
	}

	/**
	* Returns a default value to be used for $wgDefaultSkin: normally the DefaultSkin from
	* config-schema.yaml, but will fall back to another if the default skin is missing
	* and some other one is present instead.
	*
	* @param string[] $skinNames Names of installed skins.
	* @return string
	*/
	public function getDefaultSkin( array $skinNames ) {
	$defaultSkin = $GLOBALS['wgDefaultSkin'];

	if ( in_array( 'vector', $skinNames ) ) {
	$skinNames[] = 'vector-2022';
	}

	// T346332: Minerva skin uses different name from its directory name
	if ( in_array( 'minervaneue', $skinNames ) ) {
	$minervaNeue = array_search( 'minervaneue', $skinNames );
	$skinNames[$minervaNeue] = 'minerva';
	}

	if ( !$skinNames \|\| in_array( $defaultSkin, $skinNames ) ) {
	return $defaultSkin;
	} else {
	return $skinNames[0];
	}
	}

	/**
	* Installs the auto-detected extensions.
	*
	* @return Status
	*/
	protected function includeExtensions() {
	// Marker for DatabaseUpdater::loadExtensions so we don't
	// double load extensions
	define( 'MW_EXTENSIONS_LOADED', true );

	$legacySchemaHooks = $this->getAutoExtensionLegacyHooks();
	$data = $this->getAutoExtensionData();
	if ( isset( $data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
	$legacySchemaHooks = array_merge( $legacySchemaHooks,
	$data['globals']['wgHooks']['LoadExtensionSchemaUpdates'] );
	}
	$extDeprecatedHooks = $data['attributes']['DeprecatedHooks'] ?? [];

	$this->autoExtensionHookContainer = new HookContainer(
	new StaticHookRegistry(
	[ 'LoadExtensionSchemaUpdates' => $legacySchemaHooks ],
	$data['attributes']['Hooks'] ?? [],
	$extDeprecatedHooks
	),
	MediaWikiServices::getInstance()->getObjectFactory()
	);
	$this->virtualDomains = $data['attributes']['DatabaseVirtualDomains'] ?? [];

	return Status::newGood();
	}

	/**
	* Auto-detect extensions with an old style .php registration file, load
	* the extensions, and return the merged $wgHooks array.
	*
	* @suppress SecurityCheck-PathTraversal It thinks $exts/$IP is user controlled but they are not.
	* @return array
	*/
	protected function getAutoExtensionLegacyHooks() {
	$exts = $this->getVar( '_Extensions' );
	$installPath = $this->getVar( 'IP' );
	$files = [];
	foreach ( $exts as $e ) {
	if ( file_exists( "$installPath/extensions/$e/$e.php" ) ) {
	$files[] = "$installPath/extensions/$e/$e.php";
	}
	}

	if ( $files ) {
	return $this->includeExtensionFiles( $files );
	} else {
	return [];
	}
	}

	/**
	* Include the specified extension PHP files. Populate $wgAutoloadClasses
	* and return the LoadExtensionSchemaUpdates hooks.
	*
	* @param string[] $files
	* @return array LoadExtensionSchemaUpdates legacy hooks
	*/
	protected function includeExtensionFiles( $files ) {
	global $IP;
	$IP = $this->getVar( 'IP' );

	/**
	* We need to define the $wgXyz variables before including extensions to avoid
	* warnings about unset variables. However, the only thing we really
	* want here is $wgHooks['LoadExtensionSchemaUpdates']. This won't work
	* if the extension has hidden hook registration in $wgExtensionFunctions,
	* but we're not opening that can of worms
	* @see https://phabricator.wikimedia.org/T28857
	*/
	// Extract the defaults into the current scope
	foreach ( MainConfigSchema::listDefaultValues( 'wg' ) as $var => $value ) {
	$$var = $value;
	}

	// phpcs:ignore MediaWiki.VariableAnalysis.UnusedGlobalVariables
	global $wgAutoloadClasses, $wgExtensionDirectory, $wgStyleDirectory;
	$wgExtensionDirectory = "$IP/extensions";
	$wgStyleDirectory = "$IP/skins";

	foreach ( $files as $file ) {
	require_once $file;
	}

	// @phpcs:disable MediaWiki.VariableAnalysis.MisleadingGlobalNames.Misleading$wgHooks
	// @phpcs:ignore Generic.Files.LineLength.TooLong
	// @phan-suppress-next-line PhanUndeclaredVariable,PhanCoalescingAlwaysNull $wgHooks is defined by MainConfigSchema
	$hooksWeWant = $wgHooks['LoadExtensionSchemaUpdates'] ?? [];
	// @phpcs:enable MediaWiki.VariableAnalysis.MisleadingGlobalNames.Misleading$wgHooks

	// Ignore everyone else's hooks. Lord knows what someone might be doing
	// in ParserFirstCallInit (see T29171)
	return [ 'LoadExtensionSchemaUpdates' => $hooksWeWant ];
	}

	/**
	* Auto-detect extensions with an extension.json file. Load the extensions,
	* register classes with the autoloader and return the merged registry data.
	*
	* @return array
	*/
	protected function getAutoExtensionData() {
	$exts = $this->getVar( '_Extensions' );
	$installPath = $this->getVar( 'IP' );

	$extensionProcessor = new ExtensionProcessor();
	foreach ( $exts as $e ) {
	$jsonPath = "$installPath/extensions/$e/extension.json";
	if ( file_exists( $jsonPath ) ) {
	$extensionProcessor->extractInfoFromFile( $jsonPath );
	}
	}

	$autoload = $extensionProcessor->getExtractedAutoloadInfo();
	AutoLoader::loadFiles( $autoload['files'] );
	AutoLoader::registerClasses( $autoload['classes'] );
	AutoLoader::registerNamespaces( $autoload['namespaces'] );

	return $extensionProcessor->getExtractedInfo();
	}

	/**
	* Get the hook container previously populated by includeExtensions().
	*
	* @internal For use by DatabaseInstaller
	* @since 1.36
	* @return HookContainer
	*/
	public function getAutoExtensionHookContainer() {
	if ( !$this->autoExtensionHookContainer ) {
	throw new LogicException( __METHOD__ .
	': includeExtensions() has not been called' );
	}
	return $this->autoExtensionHookContainer;
	}

	/**
	* Get the virtual domains
	*
	* @internal For use by DatabaseInstaller
	* @since 1.42
	* @return array
	*/
	public function getVirtualDomains(): array {
	return $this->virtualDomains;
	}

	/**
	* Get an array of install steps. Should always be in the format of
	* [
	* 'name' => 'someuniquename',
	* 'callback' => [ $obj, 'method' ],
	* ]
	* There must be a config-install-$name message defined per step, which will
	* be shown on install.
	*
	* @param DatabaseInstaller $installer DatabaseInstaller so we can make callbacks
	* @return array[]
	* @phan-return array<int,array{name:string,callback:array{0:object,1:string}}>
	*/
	protected function getInstallSteps( DatabaseInstaller $installer ) {
	$coreInstallSteps = [
	[ 'name' => 'database', 'callback' => [ $installer, 'setupDatabase' ] ],
	[ 'name' => 'tables', 'callback' => [ $installer, 'createTables' ] ],
	[ 'name' => 'interwiki', 'callback' => [ $installer, 'populateInterwikiTable' ] ],
	[ 'name' => 'stats', 'callback' => [ $this, 'populateSiteStats' ] ],
	[ 'name' => 'keys', 'callback' => [ $this, 'generateKeys' ] ],
	[ 'name' => 'updates', 'callback' => [ $installer, 'insertUpdateKeys' ] ],
	[ 'name' => 'restore-services', 'callback' => [ $this, 'restoreServices' ] ],
	[ 'name' => 'sysop', 'callback' => [ $this, 'createSysop' ] ],
	[ 'name' => 'mainpage', 'callback' => [ $this, 'createMainpage' ] ],
	];

	// Build the array of install steps starting from the core install list,
	// then adding any callbacks that wanted to attach after a given step
	foreach ( $coreInstallSteps as $step ) {
	$this->installSteps[] = $step;
	if ( isset( $this->extraInstallSteps[$step['name']] ) ) {
	$this->installSteps = array_merge(
	$this->installSteps,
	$this->extraInstallSteps[$step['name']]
	);
	}
	}

	// Prepend any steps that want to be at the beginning
	if ( isset( $this->extraInstallSteps['BEGINNING'] ) ) {
	$this->installSteps = array_merge(
	$this->extraInstallSteps['BEGINNING'],
	$this->installSteps
	);
	}

	// Extensions should always go first, chance to tie into hooks and such
	if ( count( $this->getVar( '_Extensions' ) ) ) {
	array_unshift( $this->installSteps,
	[ 'name' => 'extensions', 'callback' => [ $this, 'includeExtensions' ] ]
	);
	$this->installSteps[] = [
	'name' => 'extension-tables',
	'callback' => [ $installer, 'createExtensionTables' ]
	];
	}

	return $this->installSteps;
	}

	/**
	* Actually perform the installation.
	*
	* @param callable $startCB A callback array for the beginning of each step
	* @param callable $endCB A callback array for the end of each step
	*
	* @return Status[]
	*/
	public function performInstallation( $startCB, $endCB ) {
	$installResults = [];
	$installer = $this->getDBInstaller();
	$installer->preInstall();
	$steps = $this->getInstallSteps( $installer );
	foreach ( $steps as $stepObj ) {
	$name = $stepObj['name'];
	call_user_func_array( $startCB, [ $name ] );

	// Perform the callback step
	$status = call_user_func( $stepObj['callback'], $installer );

	// Output and save the results
	call_user_func( $endCB, $name, $status );
	$installResults[$name] = $status;

	// If we've hit some sort of fatal, we need to bail.
	// Callback already had a chance to do output above.
	if ( !$status->isOK() ) {
	break;
	}
	}
	// @phan-suppress-next-next-line PhanPossiblyUndeclaredVariable
	// $steps has at least one element and that defines $status
	if ( $status->isOK() ) {
	$this->showSuccess(
	'config-install-db-success'
	);
	$this->setVar( '_InstallDone', true );
	}

	return $installResults;
	}

	/**
	* Generate $wgSecretKey. Will warn if we had to use an insecure random source.
	*
	* @return Status
	*/
	public function generateKeys() {
	$keys = [ 'wgSecretKey' => 64 ];
	if ( strval( $this->getVar( 'wgUpgradeKey' ) ) === '' ) {
	$keys['wgUpgradeKey'] = 16;
	}

	return $this->doGenerateKeys( $keys );
	}

	/**
	* Restore services that have been redefined in the early stage of installation
	* @return Status
	*/
	public function restoreServices() {
	// Apply wgServer, so it's available for database initialization hooks.
	$urlOptions = [
	UrlUtils::SERVER => $GLOBALS['wgServer'],
	];

	$connection = $this->getDBInstaller()
	->definitelyGetConnection( DatabaseInstaller::CONN_CREATE_TABLES );
	$virtualDomains = array_merge(
	$this->getVirtualDomains(),
	MWLBFactory::CORE_VIRTUAL_DOMAINS
	);

	$this->resetMediaWikiServices( null, [
	'DBLoadBalancerFactory' => static function () use ( $virtualDomains, $connection ) {
	return LBFactorySingle::newFromConnection(
	$connection,
	[ 'virtualDomains' => $virtualDomains ]
	);
	},
	'UrlUtils' => static function ( MediaWikiServices $services ) use ( $urlOptions ) {
	return new UrlUtils( $urlOptions );
	},
	'UserOptionsLookup' => static function ( MediaWikiServices $services ) {
	return $services->get( 'UserOptionsManager' );
	},
	] );
	return Status::newGood();
	}

	/**
	* Generate a secret value for variables using a secure generator.
	*
	* @param array $keys
	* @return Status
	*/
	protected function doGenerateKeys( $keys ) {
	foreach ( $keys as $name => $length ) {
	$secretKey = MWCryptRand::generateHex( $length );
	$this->setVar( $name, $secretKey );
	}
	return Status::newGood();
	}

	/**
	* Create the first user account, grant it sysop, bureaucrat and interface-admin rights
	*
	* @return Status
	*/
	protected function createSysop() {
	$name = $this->getVar( '_AdminName' );
	$user = User::newFromName( $name );

	if ( !$user ) {
	// We should've validated this earlier anyway!
	return Status::newFatal( 'config-admin-error-user', $name );
	}

	if ( $user->idForName() == 0 ) {
	$user->addToDatabase();

	$password = $this->getVar( '_AdminPassword' );
	$status = $user->changeAuthenticationData( [
	'username' => $user->getName(),
	'password' => $password,
	'retype' => $password,
	] );
	if ( !$status->isGood() ) {
	return Status::newFatal( 'config-admin-error-password',
	$name, $status->getWikiText( false, false, $this->getVar( '_UserLang' ) ) );
	}

	$userGroupManager = MediaWikiServices::getInstance()->getUserGroupManager();
	$userGroupManager->addUserToGroup( $user, 'sysop' );
	$userGroupManager->addUserToGroup( $user, 'bureaucrat' );
	$userGroupManager->addUserToGroup( $user, 'interface-admin' );
	if ( $this->getVar( '_AdminEmail' ) ) {
	$user->setEmail( $this->getVar( '_AdminEmail' ) );
	}
	$user->saveSettings();

	// Update user count
	$ssUpdate = SiteStatsUpdate::factory( [ 'users' => 1 ] );
	$ssUpdate->doUpdate();
	}

	if ( $this->getVar( '_Subscribe' ) && $this->getVar( '_AdminEmail' ) ) {
	return $this->subscribeToMediaWikiAnnounce();
	}
	return Status::newGood();
	}

	/**
	* @return Status
	*/
	private function subscribeToMediaWikiAnnounce() {
	$status = Status::newGood();
	$http = MediaWikiServices::getInstance()->getHttpRequestFactory();
	if ( !$http->canMakeRequests() ) {
	$status->warning( 'config-install-subscribe-fail',
	wfMessage( 'config-install-subscribe-notpossible' ) );
	return $status;
	}

	// Create subscription request
	$params = [ 'email' => $this->getVar( '_AdminEmail' ) ];
	$req = $http->create( self::MEDIAWIKI_ANNOUNCE_URL . 'anonymous_subscribe',
	[ 'method' => 'POST', 'postData' => $params ], __METHOD__ );

	// Add headers needed to pass Django's CSRF checks
	$token = str_repeat( 'a', 64 );
	$req->setHeader( 'Referer', self::MEDIAWIKI_ANNOUNCE_URL );
	$req->setHeader( 'Cookie', "csrftoken=$token" );
	$req->setHeader( 'X-CSRFToken', $token );

	// Send subscription request
	$reqStatus = $req->execute();
	if ( !$reqStatus->isOK() ) {
	$status->warning( 'config-install-subscribe-fail',
	Status::wrap( $reqStatus )->getMessage() );
	return $status;
	}

	// Was the request submitted successfully?
	// The status message is displayed after a redirect, using Django's messages
	// framework, so load the list summary page and look for the expected text.
	// (Though parsing the cookie set by the framework may be possible, it isn't
	// simple, since the format of the cookie has changed between versions.)
	$checkReq = $http->create( self::MEDIAWIKI_ANNOUNCE_URL, [], __METHOD__ );
	$checkReq->setCookieJar( $req->getCookieJar() );
	if ( !$checkReq->execute()->isOK() ) {
	$status->warning( 'config-install-subscribe-possiblefail' );
	return $status;
	}
	$html = $checkReq->getContent();
	if ( strpos( $html, 'Please check your inbox for further instructions' ) !== false ) {
	// Success
	} elseif ( strpos( $html, 'Member already subscribed' ) !== false ) {
	$status->warning( 'config-install-subscribe-alreadysubscribed' );
	} elseif ( strpos( $html, 'Subscription request already pending' ) !== false ) {
	$status->warning( 'config-install-subscribe-alreadypending' );
	} else {
	$status->warning( 'config-install-subscribe-possiblefail' );
	}
	return $status;
	}

	/**
	* Insert Main Page with default content.
	*
	* @param DatabaseInstaller $installer
	* @return Status
	*/
	protected function createMainpage( DatabaseInstaller $installer ) {
	$status = Status::newGood();
	$title = Title::newMainPage();
	if ( $title->exists() ) {
	$status->warning( 'config-install-mainpage-exists' );
	return $status;
	}
	try {
	$page = MediaWikiServices::getInstance()->getWikiPageFactory()->newFromTitle( $title );
	$content = new WikitextContent(
	wfMessage( 'mainpagetext' )->inContentLanguage()->text() . "\n\n" .
	wfMessage( 'mainpagedocfooter' )->inContentLanguage()->text()
	);

	$status = $page->doUserEditContent(
	$content,
	User::newSystemUser( 'MediaWiki default' ),
	'',
	EDIT_NEW
	);
	} catch ( Exception $e ) {
	// using raw, because $wgShowExceptionDetails can not be set yet
	$status->fatal( 'config-install-mainpage-failed', $e->getMessage() );
	}

	return $status;
	}

	/**
	* Override the necessary bits of the config to run an installation.
	*
	* @param SettingsBuilder $settings
	*/
	public static function overrideConfig( SettingsBuilder $settings ) {
	// Use PHP's built-in session handling, since MediaWiki's
	// SessionHandler can't work before we have an object cache set up.
	if ( !defined( 'MW_NO_SESSION_HANDLER' ) ) {
	define( 'MW_NO_SESSION_HANDLER', 1 );
	}

	$settings->overrideConfigValues( [

	// Don't access the database
	MainConfigNames::UseDatabaseMessages => false,

	// Don't cache langconv tables
	MainConfigNames::LanguageConverterCacheType => CACHE_NONE,

	// Don't try to cache ResourceLoader dependencies in the database
	MainConfigNames::ResourceLoaderUseObjectCacheForDeps => true,

	// Debug-friendly
	MainConfigNames::ShowExceptionDetails => true,
	MainConfigNames::ShowHostnames => true,

	// Don't break forms
	MainConfigNames::ExternalLinkTarget => '_blank',

	// Allow multiple ob_flush() calls
	MainConfigNames::DisableOutputCompression => true,

	// Use a sensible cookie prefix (not my_wiki)
	MainConfigNames::CookiePrefix => 'mw_installer',

	// Some of the environment checks make shell requests, remove limits
	MainConfigNames::MaxShellMemory => 0,

	// Override the default CookieSessionProvider with a dummy
	// implementation that won't stomp on PHP's cookies.
	MainConfigNames::SessionProviders => [
	[
	'class' => InstallerSessionProvider::class,
	'args' => [ [
	'priority' => 1,
	] ]
	]
	],

	// Don't use the DB as the main stash
	MainConfigNames::MainStash => CACHE_NONE,

	// Don't try to use any object cache for SessionManager either.
	MainConfigNames::SessionCacheType => CACHE_NONE,

	// Set a dummy $wgServer to bypass the check in Setup.php, the
	// web installer will automatically detect it and not use this value.
	MainConfigNames::Server => 'https://🌻.invalid',
	] );
	}

	/**
	* Add an installation step following the given step.
	*
	* @param array $callback A valid installation callback array, in this form:
	* [ 'name' => 'some-unique-name', 'callback' => [ $obj, 'function' ] ];
	* @param string $findStep The step to find. Omit to put the step at the beginning
	*/
	public function addInstallStep( $callback, $findStep = 'BEGINNING' ) {
	$this->extraInstallSteps[$findStep][] = $callback;
	}

	/**
	* Disable the time limit for execution.
	* Some long-running pages (Install, Upgrade) will want to do this
	*/
	protected function disableTimeLimit() {
	AtEase::suppressWarnings();
	set_time_limit( 0 );
	AtEase::restoreWarnings();
	}
	}

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