RELEASE-NOTES-1.27

   1 == MediaWiki 1.27 ==
   2
   3 THIS IS NOT A RELEASE YET
   4
   5 MediaWiki 1.27 is an alpha-quality branch and is not recommended for use in
   6 production.
   7
   8 === PHP version requirement ===
   9 As of 1.27, MediaWiki now requires PHP 5.5.9 or higher. This corresponds with
  10 HHVM 3.1.
  11
  12 === Configuration changes in 1.27 ===
  13 * $wgUseLinkNamespaceDBFields was removed.
  14 * Deprecated $wgResourceLoaderMinifierStatementsOnOwnLine and
  15   $wgResourceLoaderMinifierMaxLineLength, because there was little value in
  16   making the behavior configurable. The default values (`false` for the former,
  17   1000 for the latter) are now hard-coded.
  18 * $wgDebugDumpSqlLength was removed (deprecated in 1.24).
  19 * $wgDebugDBTransactions was removed (deprecated in 1.20).
  20 * $wgUseXVO has been removed, as it provides functionality only used by
  21   custom Wikimedia patches against Squid 2.x that probably noone uses in
  22   production anymore. There is now $wgUseKeyHeader that provides similar
  23   functionality but instead of the MediaWiki-specific X-Vary-Options header,
  24   uses the draft Key header standard.
  25 * $wgScriptExtension (and support for '.php5' entry points) was removed. See the
  26   deprecation notice in the release notes for version 1.25 for advice on how to
  27   preserve support for '.php5' entry points via URL rewriting.
  28 * Password handling via the User object has been deprecated and partially
  29   removed, pending the future introduction of AuthManager. In particular:
  30 ** expirePassword(), getPasswordExpireDate(), resetPasswordExpiration(), and
  31    getPasswordExpired() have been removed. They were unused outside of core.
  32 ** The mPassword, mNewpassword, mNewpassTime, and mPasswordExpires fields are
  33    now private and will be removed in the future.
  34 ** The getPassword() and getTemporaryPassword() methods now throw
  35    BadMethodCallException and will be removed in the future.
  36 ** The ability to pass 'password' and 'newpassword' to createNew() has been
  37    removed. The only users of it seem to have been using it to set invalid
  38    passwords, and so shouldn't be greatly affected.
  39 ** setPassword(), setInternalPassword(), and setNewpassword() have been
  40    deprecated, pending the introduction of AuthManager.
  41 ** User::randomPassword() is deprecated in favor of a new method
  42    PasswordFactory::generateRandomPasswordString()
  43 ** User::getPasswordFactory() is deprecated, callers should just create a
  44    PasswordFactory themselves.
  45 ** A new constructor, User::newSystemUser(), has been added to simplify the
  46    creation of passwordless "system" users for logged actions.
  47 * $wgMaxSquidPurgeTitles was removed.
  48 * $wgAjaxWatch was removed. This is now enabled by default.
  49 * $wgUseInstantCommons now hotlinks Commons images by default instead of
  50   downloading originals and thumbnailing them locally. This allows wikis to save
  51   on CPU and bandwidth while reducing time to first byte for pages, even without
  52   a thumbnail handler. See $wgForeignFileRepos documentation for tweaks.
  53 * (T27397) WebP is enabled by default as an uploadable filetype.
  54 * (T48998) $wgArticlePath must now be either a full url, or start with a "/".
  55 * $wgRateLimitLog was removed; use $wgDebugLogGroups['ratelimit'] instead.
  56 * Deprecated API formats dbg, txt, and yaml have been removed.
  57 * CLDRPluralRule* classes have been replaced with
  58   wikimedia/cldr-plural-rule-parser.
  59 * Removed $wgProfilePerHost, $wgUDPProfilerHost, $wgUDPProfilerPort,
  60   $wgUDPProfilerFormatString, $wgStatsMethod, $wgAggregateStatsID,
  61   $wgStatsFormatString, and $wgProfileCallTree (deprecated since 1.20).
  62 * For proper operation of LocalIdLookup with shared user tables, ensure that
  63   $wgSharedDB and $wgSharedTables are properly set even on the "central" wiki
  64   that all others are sharing from and that $wgLocalDatabases is set to the
  65   full list of sharing wikis on all those wikis.
  66 * Massive overhaul to session handling:
  67 ** $wgSessionsInObjectCache is no longer supported and must be true, due to
  68    MediaWiki\Session\SessionManager. $wgSessionHandler is similarly no longer
  69    used.
  70 ** ObjectCacheSessionHandler is removed, replaced with
  71    MediaWiki\Session\PhpSessionHandler.
  72 ** PHP session handling in general ($_SESSION, session_id(), and so on) is
  73    deprecated. Use MediaWiki\Session\SessionManager instead. A new config
  74    variable, $wgPHPSessionHandling, is available to cause use of $_SESSION to
  75    issue a deprecation warning or to cause most PHP session handling to throw
  76    exceptions.
  77 ** Deprecated UserSetCookies hook. Session-handling extensions should generally
  78    be creating a custom subclass of CookieSessionProvider. Other extensions
  79    messing with cookies can no longer count on user data being saved in cookies
  80    versus other methods.
  81 ** Deprecated UserLoadFromSession hook, extensions should create a
  82    MediaWiki\Session\SessionProvider.
  83 ** The User cannot be loaded from session until after Setup.php completes.
  84    Attempts to do so will be ignored and the User will remain unloaded.
  85 ** CSRF tokens may be fetched from the MediaWiki\Session\Session, which uses
  86    the MediaWiki\Session\Token class.
  87 * MediaWiki will now auto-create users as necessary, removing the need for
  88   extensions to do so. An 'autocreateaccount' right is added to allow
  89   auto-creation when 'createaccount' is not granted to all users.
  90 * Deprecated AuthPluginAutoCreate hook in favor of LocalUserCreated.
  91 * Most cookie-handling methods in User are deprecated.
  92 * $wgAllowAsyncCopyUploads and $CopyUploadAsyncTimeout were removed. This was an
  93   experimental feature that has never worked.
  94 * Login and createaccount tokens now vary by timestamp.
  95 * LoginForm::getLoginToken() and LoginForm::getCreateaccountToken()
  96   return a MediaWiki\Session\Token, and tokens must be checked using that
  97   class's methods.
  98 * $wgEnotifUseJobQ was removed and the job queue is always used.
  99 * The functionality of the ApiSandbox extension has been merged into core. The
 100   extension should no longer be used.
 101 * $wgPreloadJavaScriptMwUtil was removed (deprecated in 1.26).
 102   Extensions, skins, gadgets and scripts that use the mediawiki.util module must
 103   express a dependency on it.
 104
 105 === New features in 1.27 ===
 106 * $wgDataCenterUpdateStickTTL was also added. This decides how long a user
 107   sticks to the primary DC (via cookies) after they make changes to the site.
 108 * Added a new hook, 'UserMailerTransformContent', to transform the contents
 109   of an email. This is similar to the EmailUser hook but applies to all mail
 110   sent via UserMailer.
 111 * Added a new hook, 'UserMailerTransformMessage', to transform the contents
 112   of an emai after MIME encoding.
 113 * Added a new hook, 'UserMailerSplitTo', to control which users have to be
 114   emailed separately (ie. there is a single address in the To: field) so
 115   user-specific changes to the email can be applied safely.
 116 * $wgCdnMaxageLagged was added, which limits the CDN cache TTL
 117   when any load balancer uses a DB that is lagged beyond the 'max lag'
 118   setting in the relevant section of $wgLBFactoryConf.
 119 * User::newSystemUser() may be used to simplify the creation of passwordless
 120   "system" users for logged actions from scripts and extensions.
 121 * Extensions can now return detailed error information via the API when
 122   preventing user actions using 'getUserPermissionsErrors' and similar hooks
 123   by using ApiMessage instances instead of strings for the $result value.
 124 * $wgAPIMaxLagThreshold was added to limit bot changes when databases lag
 125   becomes too high.
 126 * Skins and extensions can now use FlexBox mixins (.flex-display(@display: flex)
 127   and .flex(@grow: 1, @shrink: 1, @width: auto, @order: 1)) in Less to create
 128   cross-browser-compatible FlexBox rules. Users will still need to add fallback
 129   float rules or the like for compatibility with IE9- separately.
 130 * Added MWTimestamp::getTimezoneString() which returns the localized timezone
 131   string, if available. To localize this string, see the comments of
 132   $wgLocaltimezone in includes/DefaultSettings.php.
 133 * Added CentralIdLookup, a service that allows extensions needing a concept of
 134   "central" users to get that without having to know about specific central
 135   authentication extensions.
 136 * $wgMaxUserDBWriteDuration added to limit huge user-generated transactions.
 137   Regular web request transactions that takes longer than this are aborted.
 138 * Added a new hook, 'TitleMoveCompleting', which runs before a page move is
 139   committed.
 140 * $wgCdnReboundPurgeDelay was added to provide secondary delayed purges of URLs
 141   from CDN to mitigate DB replication lag and WAN cache purge lag.
 142 * (T49162) Installer will default to setting CACHE_ACCEL as the main cache type
 143   if it is available.
 144 * It is now possible to patrol file uploads (both for new files and new versions
 145   of existing files). Special:NewFiles has gained an option to filter by patrol
 146   status. This functionality can be disabled using $wgUseFilePatrol.
 147 * MediaWiki\Session infrastructure allows for easier use of session mechanisms
 148   other than the usual cookies.
 149 ** SessionMetadata and SessionCheckInfo hooks allow for setting and checking
 150    custom session metadata.
 151 * Added MWGrants and associated configuration settings $wgGrantPermissions and
 152   $wgGrantPermissionGroups to hold configuration for authentication features
 153   such as OAuth that want to allow restricting the user rights a user may make
 154   use of.
 155 ** If you're already using the OAuth extension, these new variables are
 156    identical to (and will replace) $wgMWOAuthGrantPermissions and
 157    $wgMWOAuthGrantPermissionGroups.
 158 * Added MWRestrictions as a class to check restrictions on a WebRequest, e.g.
 159   to assert that the request comes from a particular IP range.
 160 * Added bot passwords, a rights-restricted login mechanism for API-using bots.
 161 * Whitelisted the following HTML attributes for all elements in wikitext:
 162   aria-describedby, aria-flowto, aria-label, aria-labelledby, aria-owns.
 163 * Removed "presentation" restriction on the HTML role attribute in wikitext.
 164   All values are now allowed for the role attribute.
 165 * $wgContentHandlers now also supports callbacks to create an instance of the
 166   appropriate ContentHandler subclass.
 167 * Added $wgAuthenticationTokenVersion, which if non-null prevents the
 168   user_token database field from being exposed in cookies. Setting this would
 169   be a good idea, but will log out all current sessions.
 170 * $wgEventRelayerConfig was added, for managing PubSub event relay configuration,
 171   specifically for reliable CDN url purges.
 172
 173 === External library changes in 1.27 ===
 174
 175 ==== Upgraded external libraries ====
 176 * Updated oojs/oojs-ui from v0.12.12 to v0.13.3.
 177 * Updated composer/semver from v1.0.0 to v1.2.0.
 178 * Updated liuggio/statsd-php-client to 1.0.18.
 179 * Updated QUnit from v1.18.0 to v1.22.0.
 180
 181 ==== New external libraries ====
 182 * Added wikimedia/base-convert v1.0.1.
 183 * Added wikimedia/cldr-plural-rule-parser v1.0.0.
 184 * Added wikimedia/relpath v1.0.3.
 185 * Added wikimedia/running-stat v1.1.0.
 186 * Added wikimedia/php-session-serializer v1.0.3.
 187
 188 ==== Removed and replaced external libraries ====
 189
 190 === Bug fixes in 1.27 ===
 191 * Special:Upload will now display correct maximum allowed file size when running
 192   under HHVM (T116347).
 193
 194 === Action API changes in 1.27 ===
 195 * Added list=allrevisions.
 196 * generator=recentchanges now has the option to generate revids.
 197 * ApiPageSet::setRedirectMergePolicy() was added. This allows generator
 198   modules to define how generator data for a redirect source gets merged
 199   into the redirect destination.
 200 * prop=imageinfo&iiprop=uploadwarning will no longer include the possibility of
 201   "was-deleted" warning.
 202 * Added difftotextpst to query=revisions which preforms a pre-save transform on
 203   the text before diffing it.
 204 * Deprecated formats dbg, txt, and yaml have been removed.
 205 * (T47988) The protect log event details now use new-style formatting.
 206 * The following response properties from action=login are deprecated, and may
 207   be removed in the future: lgtoken, cookieprefix, sessionid. Clients should
 208   handle cookies to properly manage session state.
 209 * action=login transparently allows login using bot passwords. Clients should
 210   merely need to change the username and password used after setting up a bot
 211   password.
 212 * action=upload no longer understands statuskey, asyncdownload or leavemessage.
 213
 214 === Action API internal changes in 1.27 ===
 215 * ApiQueryORM removed.
 216 * The following classes have been removed:
 217 ** ApiFormatDbg
 218 ** ApiFormatTxt
 219 ** ApiFormatYaml
 220 * ApiBase::addTokenProperties() was removed (deprecated since 1.24).
 221 * ApiBase::getFinalPossibleErrors() was removed (deprecated since 1.24).
 222 * ApiBase::getFinalResultProperties() was removed (deprecated since 1.24).
 223 * ApiBase::getRequireAtLeastOneParameterErrorMessages() was removed (deprecated since 1.24).
 224 * ApiBase::getPossibleErrors() was removed (deprecated since 1.24).
 225 * ApiBase::getRequireMaxOneParameterErrorMessages() was removed (deprecated since 1.24).
 226 * ApiBase::getRequireOnlyOneParameterErrorMessages() was removed (deprecated since 1.24).
 227 * ApiBase::getResultProperties() was removed (deprecated since 1.24).
 228 * ApiBase::getTitleOrPageIdErrorMessage() was removed (deprecated since 1.24).
 229 * ApiBase::parseErrors() was removed (deprecated since 1.24).
 230 * ApiQueryBase::titleToKey(), ApiQueryBase::keyToTitle() and
 231   ApiQueryBase::keyPartToTitle() all removed (deprecated since 1.24).
 232 * ApiQueryBase::checkRowCount() was removed (deprecated since 1.24).
 233 * ApiQueryBase::getDirectionDescription() was removed (deprecated since 1.25).
 234 * ApiQuery::getGenerators() was removed (deprecated since 1.21).
 235 * ApiQuery::getModules() was removed (deprecated since 1.21).
 236 * ApiQuery::getModuleType() was removed (deprecated since 1.21).
 237 * ApiQuery::setGeneratorContinue() was removed (deprecated since 1.24).
 238 * ApiMain::getModules() was removed (deprecated since 1.21).
 239 * ApiBase::getVersion() was removed (deprecated since 1.21).
 240 * Language::getLangObj() was removed (deprecated since 1.24).
 241 * Language::getLanguageName() was removed (deprecated since 1.20).
 242 * Language::getLanguageNames() was removed (deprecated since 1.20).
 243 * Language::getTranslatedLanguageNames() was removed (deprecated since 1.20).
 244 * Language::specialPage() was removed (deprecated since 1.24).
 245 * OutputPage::getHeadItems() was removed (deprecated since 1.24).
 246 * OutputPage::getScript() was removed (deprecated since 1.24).
 247 * OutputPage::out() was removed (deprecated since 1.22).
 248 * OutputPage::setAllowedModules() was removed (deprecated since 1.24).
 249
 250 === Languages updated in 1.27 ===
 251
 252 MediaWiki supports over 350 languages. Many localisations are updated
 253 regularly. Below only new and removed languages are listed, as well as
 254 changes to languages because of Phabricator reports.
 255
 256 * (T113688) Change default numerals from Gurmukhi to Arabic for Punjabi locale.
 257
 258 === Other changes in 1.27 ===
 259 * ProfilerOutputUdp was removed. Note that there is a ProfilerOutputStats class.
 260 * WikiPage::doDeleteArticleReal() and WikiPage::doDeleteArticle() now
 261   ignore the 2nd and 3rd arguments (formerly $id and $commit).
 262 * Removed "loaderScripts" option from ResourceLoaderFileModule class.
 263 * Removed ORM-like wrapper added in 1.20.
 264 * LinkCache::getGoodLinks and LinkCache::getBadLinks were removed
 265   (deprecated in 1.26).
 266 * WikiPage::doQuickEdit() was removed (deprecated since 1.21).
 267 * Removed SiteObject and SiteArray classes (deprecated in 1.21).
 268 * MessageBlobStore::getInstance() was removed (deprecated since 1.25).
 269 * (T84937) Free external links ("autolinked" urls) will now be terminated
 270   by &nbsp; and HTML entity encodings of &nbsp, <, and >.
 271 * (T36948) The default file revert message's timestamp is now in
 272   $wgLocaltimezone, instead of UTC.
 273 * The default name of the 'suppress' group page has been changed from
 274   'Project:Oversight' to 'Project:Suppress'.
 275 * DatabaseBase::resultObject() is now protected (use outside Database classes
 276   not necessary since 1.11).
 277 * Calling ResourceLoaderFileModule::readStyleFiles() without a
 278   ResourceLoaderContext instance is deprecated.
 279 * ResourceLoader::getLessCompiler() now takes an optional parameter of
 280   additional LESS variables to set for the compiler.
 281 * wfBaseConvert() marked as deprecated, use Wikimedia\base_convert() directly
 282   instead.
 283 * Obsolete maintenance scripts clearCacheStats.php and showCacheStats.php
 284   were removed. The underlying data is sent to StatsD (see $wgStatsdServer).
 285 * Removed msg_resource_links database table and associated code.
 286 * Removed msg_resource database table and associated code.
 287 * Skin::getNamespaceNotice() was removed.
 288 * wfIsConfiguredProxy() was removed (deprecated since 1.24).
 289 * wfDebugTimer() was removed (deprecated since 1.25).
 290 * wfIsTrustedProxy() was removed (deprecated since 1.24).
 291 * wfGetIP() was removed (deprecated since 1.19).
 292 * MWHookException was removed.
 293 * OutputPage::appendSubtitle() was removed (deprecated since 1.19).
 294 * OutputPage::loginToUse() was removed (deprecated since 1.19).
 295 * Article::loadContent() was removed (deprecated since 1.19).
 296 * User::editToken() was removed (deprecated since 1.19).
 297 * Removed --force-normal option of dumpBackup.php, as it no longer served
 298   any useful purpose since 1.22.
 299 * The functions processOption() and processArgs() on the BackupDumper and
 300   TextPassDumper classes have been removed.
 301 * The maintenance/backupTextPass.inc file was deleted. You should include
 302   maintenance/dumpTextPass.php instead.
 303 * WikiPage::getUsedTemplates() was removed (deprecated since 1.19).
 304 * wfEmptyMsg() was removed (deprecated since 1.18).
 305 * OutputPage::permissionRequired() was removed (deprecated since 1.18).
 306 * OutputPage::blockedPage() was removed (deprecated since 1.18).
 307 * User::getSkin() was removed (deprecated since 1.18).
 308 * OutputPage::includeJQuery() was removed (deprecated since 1.17).
 309 * WikiPage::updateRestrictions() was removed (deprecated since 1.19).
 310 * WikiPage::testPreSaveTransform() was removed (deprecated since 1.19).
 311 * LogPage::logName() was removed (deprecated since 1.19).
 312 * LogPage::logHeader() was removed (deprecated since 1.19).
 313 * wfCheckLimits() was removed (deprecated since 1.24).
 314 * Linker::makeKnownLinkObj() was removed (deprecated since 1.16).
 315 * Linker::makeLinkObj() was removed (deprecated since 1.16).
 316 * wfMsgForContentNoTrans() was removed (deprecated since 1.18).
 317 * ChangesList::usePatrol was removed (deprecated since 1.22).
 318 * wfMsgNoTrans() was removed (deprecated since 1.18).
 319 * Linker::makeImageLink2 was removed (deprecated since 1.20).
 320 * Title::userIsWatching() was removed (deprecated since 1.20).
 321 * Removed WaitForSlave maintenance script; use SELECT MASTER_POS_WAIT()
 322   database function directly instead.
 323 * wfMsg() was removed (deprecated since 1.18).
 324 * wfMsgForContent() was removed (deprecated since 1.18).
 325 * wfMsgReal() was removed (deprecated since 1.18).
 326 * wfMsgGetKey() was removed (deprecated since 1.18).
 327 * wfMsgHtml() was removed (deprecated since 1.18).
 328 * wfMsgWikiHtml() was removed (deprecated since 1.18).
 329 * wfMsgExt() was removed (deprecated since 1.18).
 330 * Language::armourMath() was removed (deprecated since 1.22).
 331 * LanguageConverter::armourMath() was removed (deprecated since 1.22).
 332 * FakeConverter::armourMath() was removed (deprecated since 1.22).
 333 * The unused jquery.validate ResourceLoader module was removed.
 334 * FileRepo::getRootUrl() was removed (deprecated since 1.20).
 335 * User::generateToken() was removed (deprecated since 1.20).
 336 * WikiPage::getRawText() was removed (deprecated since 1.21).
 337 * ParserOutput::hasCustomDataUpdates() was removed (deprecated since 1.25).
 338 * ParserOutput::addSecondaryDataUpdate() was removed (deprecated since 1.25).
 339 * ParserOutput::getSecondaryDataUpdates() was removed (deprecated since 1.25).
 340 * Gallery images with multiple caption pipes no longer concatenate them all
 341   together but instead pick the final one, similar to image syntax.
 342 * XML-like parser tags (such as <gallery>), when unclosed, will be left unparsed
 343   rather than consume everything until the end of the page.
 344 * New maintenance script resetUserEmail.php allows sysadmins to reset user emails in case
 345   a user forgot password/account was stolen.
 346 * wfCheckEntropy() was removed (deprecated in 1.27).
 347 * Browser support for Internet Explorer 8 lowered from Grade A to Grade C.
 348 * ContentHandler::supportsCategories method added. Default is true.
 349   CategoryMembershipChangeJob updates are skipped for content that
 350   does not support categories.
 351 * wikidiff difference engine is no longer supported, anyone still using it are encouraged
 352   to upgrade to wikidiff2 which is actively maintained and has better package availability.
 353 * Database logic was removed from WatchedItem and a WatchedItemStore was created:
 354 ** WatchedItem::IGNORE_USER_RIGHTS and WatchedItem::CHECK_USER_RIGHTS were deprecated.
 355    User::IGNORE_USER_RIGHTS and User::CHECK_USER_RIGHTS were introduced.
 356 ** WatchedItem::fromUserTitle was deprecated in favour of the constructor.
 357 ** WatchedItem::resetNotificationTimestamp was deprecated.
 358 ** WatchedItem::batchAddWatch was deprecated.
 359 ** WatchedItem::addWatch was deprecated.
 360 ** WatchedItem::removeWatch was deprecated.
 361 ** WatchedItem::isWatched was deprecated.
 362 ** WatchedItem::duplicateEntries was deprecated.
 363 ** EmailNotification::updateWatchlistTimestamp was deprecated.
 364 ** User::getWatchedItem was removed.
 365 * Unit tests don't work with external PHPUnit anymore, Composer is now the only supported
 366   way. Run `composer install` to install it and other dev dependencies to run unit tests.
 367 * wl_id field added to the watchlist table.
 368
 369 == Compatibility ==
 370
 371 MediaWiki 1.27 requires PHP 5.5.9 or later. There is experimental support for
 372 HHVM 3.6.5 or later.
 373
 374 MySQL is the recommended DBMS. PostgreSQL or SQLite can also be used, but
 375 support for them is somewhat less mature. There is experimental support for
 376 Oracle and Microsoft SQL Server.
 377
 378 The supported versions are:
 379
 380 * MySQL 5.0.3 or later
 381 * PostgreSQL 8.3 or later
 382 * SQLite 3.3.7 or later
 383 * Oracle 9.0.1 or later
 384 * Microsoft SQL Server 2005 (9.00.1399)
 385
 386 == Upgrading ==
 387
 388 1.27 has several database changes since 1.26, and will not work without schema
 389 updates. Note that due to changes to some very large tables like the revision
 390 table, the schema update may take quite long (minutes on a medium sized site,
 391 many hours on a large site).
 392
 393 If upgrading from before 1.11, and you are using a wiki as a commons
 394 repository, make sure that it is updated as well. Otherwise, errors may arise
 395 due to database schema changes.
 396
 397 If upgrading from before 1.7, you may want to run refreshLinks.php to ensure
 398 new database fields are filled with data.
 399
 400 If you are upgrading from MediaWiki 1.4.x or earlier, you should upgrade to
 401 1.5 first. The upgrade script maintenance/upgrade1_5.php has been removed
 402 with MediaWiki 1.21.
 403
 404 Don't forget to always back up your database before upgrading!
 405
 406 See the file UPGRADE for more detailed upgrade instructions.
 407
 408 For notes on 1.26.x and older releases, see HISTORY.
 409
 410 == Online documentation ==
 411
 412 Documentation for both end-users and site administrators is available on
 413 MediaWiki.org, and is covered under the GNU Free Documentation License (except
 414 for pages that explicitly state that their contents are in the public domain):
 415
 416        https://www.mediawiki.org/wiki/Documentation
 417
 418 == Mailing list ==
 419
 420 A mailing list is available for MediaWiki user support and discussion:
 421
 422        https://lists.wikimedia.org/mailman/listinfo/mediawiki-l
 423
 424 A low-traffic announcements-only list is also available:
 425
 426        https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce
 427
 428 It's highly recommended that you sign up for one of these lists if you're
 429 going to run a public MediaWiki, so you can be notified of security fixes.
 430
 431 == IRC help ==
 432
 433 There's usually someone online in #mediawiki on irc.freenode.net.