RELEASE-NOTES-1.27

   1 Security reminder: If you have PHP's register_globals option set, you must
   2 turn it off. MediaWiki will not work with it enabled.
   3
   4 == MediaWiki 1.27 ==
   5
   6 THIS IS NOT A RELEASE YET
   7
   8 MediaWiki 1.27 is an alpha-quality branch and is not recommended for use in
   9 production.
  10
  11 === Configuration changes in 1.27 ===
  12 * $wgUseLinkNamespaceDBFields was removed.
  13 * Deprecated $wgResourceLoaderMinifierStatementsOnOwnLine and
  14   $wgResourceLoaderMinifierMaxLineLength, because there was little value in
  15   making the behavior configurable. The default values (`false` for the former,
  16   1000 for the latter) are now hard-coded.
  17 * $wgDebugDumpSqlLength was removed (deprecated in 1.24).
  18 * $wgDebugDBTransactions was removed (deprecated in 1.20).
  19 * $wgUseXVO has been removed, as it provides functionality only used by
  20   custom Wikimedia patches against Squid 2.x that probably noone uses in
  21   production anymore. There is now $wgUseKeyHeader that provides similar
  22   functionality but instead of the MediaWiki-specific X-Vary-Options header,
  23   uses the draft Key header standard.
  24 * $wgScriptExtension (and support for '.php5' entry points) was removed. See the
  25   deprecation notice in the release notes for version 1.25 for advice on how to
  26   preserve support for '.php5' entry points via URL rewriting.
  27 * Password handling via the User object has been deprecated and partially
  28   removed, pending the future introduction of AuthManager. In particular:
  29 ** expirePassword(), getPasswordExpireDate(), resetPasswordExpiration(), and
  30    getPasswordExpired() have been removed. They were unused outside of core.
  31 ** The mPassword, mNewpassword, mNewpassTime, and mPasswordExpires fields are
  32    now private and will be removed in the future.
  33 ** The getPassword() and getTemporaryPassword() methods now throw
  34    BadMethodCallException and will be removed in the future.
  35 ** The ability to pass 'password' and 'newpassword' to createNew() has been
  36    removed. The only users of it seem to have been using it to set invalid
  37    passwords, and so shouldn't be greatly affected.
  38 ** setPassword(), setInternalPassword(), and setNewpassword() have been
  39    deprecated, pending the introduction of AuthManager.
  40 ** User::randomPassword() is deprecated in favor of a new method
  41    PasswordFactory::generateRandomPasswordString()
  42 ** User::getPasswordFactory() is deprecated, callers should just create a
  43    PasswordFactory themselves.
  44 ** A new constructor, User::newSystemUser(), has been added to simplify the
  45    creation of passwordless "system" users for logged actions.
  46 * $wgMaxSquidPurgeTitles was removed.
  47 * $wgAjaxWatch was removed. This is now enabled by default.
  48 * $wgUseInstantCommons now hotlinks Commons images by default instead of
  49   downloading originals and thumbnailing them locally. This allows wikis to save
  50   on CPU and bandwidth while reducing time to first byte for pages, even without
  51   a thumbnail handler. See $wgForeignFileRepos documentation for tweaks.
  52 * (T27397) WebP is enabled by default as an uploadable filetype.
  53 * (T48998) $wgArticlePath must now be either a full url, or start with a "/".
  54
  55 === New features in 1.27 ===
  56 * $wgDataCenterId and $wgDataCenterRoles where added, which will serve as
  57   basic configuration settings needed for multi-datacenter setups.
  58   $wgDataCenterUpdateStickTTL was also added.
  59 * Added a new hook, 'UserMailerTransformContent', to transform the contents
  60   of an email. This is similar to the EmailUser hook but applies to all mail
  61   sent via UserMailer.
  62 * Added a new hook, 'UserMailerTransformMessage', to transform the contents
  63   of an emai after MIME encoding.
  64 * Added a new hook, 'UserMailerSplitTo', to control which users have to be
  65   emailed separately (ie. there is a single address in the To: field) so
  66   user-specific changes to the email can be applied safely.
  67 * $wgCdnMaxageLagged was added, which limits the CDN cache TTL
  68   when any load balancer uses a DB that is lagged beyond the 'max lag'
  69   setting in the relevant section of $wgLBFactoryConf.
  70 * User::newSystemUser() may be used to simplify the creation of passwordless
  71   "system" users for logged actions from scripts and extensions.
  72 * Extensions can now return detailed error information via the API when
  73   preventing user actions using 'getUserPermissionsErrors' and similar hooks
  74   by using ApiMessage instances instead of strings for the $result value.
  75 * $wgAPIMaxLagThreshold was added to limit bot changes when databases lag
  76   becomes too high.
  77 * Skins and extensions can now use FlexBox mixins (.flex-display(@display: flex)
  78   and .flex(@grow: 1, @shrink: 1, @width: auto, @order: 1)) in Less to create
  79   cross-browser-compatible FlexBox rules. Users will still need to add fallback
  80   float rules or the like for compatibility with IE9- separately.
  81
  82 ==== External libraries ====
  83
  84 === Bug fixes in 1.27 ===
  85 * Special:Upload will now display correct maximum allowed file size when running
  86   under HHVM (T116347).
  87
  88 === Action API changes in 1.27 ===
  89 * Added list=allrevisions.
  90 * generator=recentchanges now has the option to generate revids.
  91 * ApiPageSet::setRedirectMergePolicy() was added. This allows generator
  92   modules to define how generator data for a redirect source gets merged
  93   into the redirect destination.
  94 * prop=imageinfo&iiprop=uploadwarning will no longer include the possibility of
  95   "was-deleted" warning.
  96 * Added difftotextpst to query=revisions which preforms a pre-save transform on
  97   the text before diffing it.
  98
  99 === Action API internal changes in 1.27 ===
 100 * ApiQueryORM removed.
 101
 102 === Languages updated in 1.27 ===
 103
 104 MediaWiki supports over 350 languages. Many localisations are updated
 105 regularly. Below only new and removed languages are listed, as well as
 106 changes to languages because of Bugzilla reports.
 107
 108 * (T113688) Change default numerals from Gurmukhi to Arabic for Punjabi locale.
 109
 110 === Other changes in 1.27 ===
 111 * ProfilerOutputUdp was removed. Note that there is a ProfilerOutputStats class.
 112 * WikiPage::doDeleteArticleReal() and WikiPage::doDeleteArticle() now
 113   ignore the 2nd and 3rd arguments (formerly $id and $commit).
 114 * Removed "loaderScripts" option from ResourceLoaderFileModule class.
 115 * Removed ORM-like wrapper added in 1.20.
 116 * LinkCache::getGoodLinks and LinkCache::getBadLinks were removed (deprecated in 1.26).
 117 * WikiPage::doQuickEdit() was removed (deprecated since 1.21).
 118 * Removed SiteObject and SiteArray classes (deprecated in 1.21).
 119 * MessageBlobStore::getInstance() was removed (deprecated since 1.25).
 120
 121 == Compatibility ==
 122
 123 MediaWiki 1.27 requires PHP 5.3.3 or later. There is experimental support for
 124 HHVM 3.3.0.
 125
 126 MySQL is the recommended DBMS. PostgreSQL or SQLite can also be used, but
 127 support for them is somewhat less mature. There is experimental support for
 128 Oracle and Microsoft SQL Server.
 129
 130 The supported versions are:
 131
 132 * MySQL 5.0.3 or later
 133 * PostgreSQL 8.3 or later
 134 * SQLite 3.3.7 or later
 135 * Oracle 9.0.1 or later
 136 * Microsoft SQL Server 2005 (9.00.1399)
 137
 138 == Upgrading ==
 139
 140 1.27 has several database changes since 1.26, and will not work without schema
 141 updates. Note that due to changes to some very large tables like the revision
 142 table, the schema update may take quite long (minutes on a medium sized site,
 143 many hours on a large site).
 144
 145 If upgrading from before 1.11, and you are using a wiki as a commons
 146 repository, make sure that it is updated as well. Otherwise, errors may arise
 147 due to database schema changes.
 148
 149 If upgrading from before 1.7, you may want to run refreshLinks.php to ensure
 150 new database fields are filled with data.
 151
 152 If you are upgrading from MediaWiki 1.4.x or earlier, you should upgrade to
 153 1.5 first. The upgrade script maintenance/upgrade1_5.php has been removed
 154 with MediaWiki 1.21.
 155
 156 Don't forget to always back up your database before upgrading!
 157
 158 See the file UPGRADE for more detailed upgrade instructions.
 159
 160 For notes on 1.26.x and older releases, see HISTORY.
 161
 162 == Online documentation ==
 163
 164 Documentation for both end-users and site administrators is available on
 165 MediaWiki.org, and is covered under the GNU Free Documentation License (except
 166 for pages that explicitly state that their contents are in the public domain):
 167
 168        https://www.mediawiki.org/wiki/Documentation
 169
 170 == Mailing list ==
 171
 172 A mailing list is available for MediaWiki user support and discussion:
 173
 174        https://lists.wikimedia.org/mailman/listinfo/mediawiki-l
 175
 176 A low-traffic announcements-only list is also available:
 177
 178        https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce
 179
 180 It's highly recommended that you sign up for one of these lists if you're
 181 going to run a public MediaWiki, so you can be notified of security fixes.
 182
 183 == IRC help ==
 184
 185 There's usually someone online in #mediawiki on irc.freenode.net.