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 * $wgRateLimitLog was removed; use $wgDebugLogGroups['ratelimit'] instead.
  55
  56 === New features in 1.27 ===
  57 * $wgDataCenterId and $wgDataCenterRoles where added, which will serve as
  58   basic configuration settings needed for multi-datacenter setups.
  59   $wgDataCenterUpdateStickTTL was also added.
  60 * Added a new hook, 'UserMailerTransformContent', to transform the contents
  61   of an email. This is similar to the EmailUser hook but applies to all mail
  62   sent via UserMailer.
  63 * Added a new hook, 'UserMailerTransformMessage', to transform the contents
  64   of an emai after MIME encoding.
  65 * Added a new hook, 'UserMailerSplitTo', to control which users have to be
  66   emailed separately (ie. there is a single address in the To: field) so
  67   user-specific changes to the email can be applied safely.
  68 * $wgCdnMaxageLagged was added, which limits the CDN cache TTL
  69   when any load balancer uses a DB that is lagged beyond the 'max lag'
  70   setting in the relevant section of $wgLBFactoryConf.
  71 * User::newSystemUser() may be used to simplify the creation of passwordless
  72   "system" users for logged actions from scripts and extensions.
  73 * Extensions can now return detailed error information via the API when
  74   preventing user actions using 'getUserPermissionsErrors' and similar hooks
  75   by using ApiMessage instances instead of strings for the $result value.
  76 * $wgAPIMaxLagThreshold was added to limit bot changes when databases lag
  77   becomes too high.
  78 * Skins and extensions can now use FlexBox mixins (.flex-display(@display: flex)
  79   and .flex(@grow: 1, @shrink: 1, @width: auto, @order: 1)) in Less to create
  80   cross-browser-compatible FlexBox rules. Users will still need to add fallback
  81   float rules or the like for compatibility with IE9- separately.
  82
  83 ==== External libraries ====
  84
  85 === Bug fixes in 1.27 ===
  86 * Special:Upload will now display correct maximum allowed file size when running
  87   under HHVM (T116347).
  88
  89 === Action API changes in 1.27 ===
  90 * Added list=allrevisions.
  91 * generator=recentchanges now has the option to generate revids.
  92 * ApiPageSet::setRedirectMergePolicy() was added. This allows generator
  93   modules to define how generator data for a redirect source gets merged
  94   into the redirect destination.
  95 * prop=imageinfo&iiprop=uploadwarning will no longer include the possibility of
  96   "was-deleted" warning.
  97 * Added difftotextpst to query=revisions which preforms a pre-save transform on
  98   the text before diffing it.
  99
 100 === Action API internal changes in 1.27 ===
 101 * ApiQueryORM removed.
 102
 103 === Languages updated in 1.27 ===
 104
 105 MediaWiki supports over 350 languages. Many localisations are updated
 106 regularly. Below only new and removed languages are listed, as well as
 107 changes to languages because of Bugzilla reports.
 108
 109 * (T113688) Change default numerals from Gurmukhi to Arabic for Punjabi locale.
 110
 111 === Other changes in 1.27 ===
 112 * ProfilerOutputUdp was removed. Note that there is a ProfilerOutputStats class.
 113 * WikiPage::doDeleteArticleReal() and WikiPage::doDeleteArticle() now
 114   ignore the 2nd and 3rd arguments (formerly $id and $commit).
 115 * Removed "loaderScripts" option from ResourceLoaderFileModule class.
 116 * Removed ORM-like wrapper added in 1.20.
 117 * LinkCache::getGoodLinks and LinkCache::getBadLinks were removed (deprecated in 1.26).
 118 * WikiPage::doQuickEdit() was removed (deprecated since 1.21).
 119 * Removed SiteObject and SiteArray classes (deprecated in 1.21).
 120 * MessageBlobStore::getInstance() was removed (deprecated since 1.25).
 121
 122 == Compatibility ==
 123
 124 MediaWiki 1.27 requires PHP 5.3.3 or later. There is experimental support for
 125 HHVM 3.3.0.
 126
 127 MySQL is the recommended DBMS. PostgreSQL or SQLite can also be used, but
 128 support for them is somewhat less mature. There is experimental support for
 129 Oracle and Microsoft SQL Server.
 130
 131 The supported versions are:
 132
 133 * MySQL 5.0.3 or later
 134 * PostgreSQL 8.3 or later
 135 * SQLite 3.3.7 or later
 136 * Oracle 9.0.1 or later
 137 * Microsoft SQL Server 2005 (9.00.1399)
 138
 139 == Upgrading ==
 140
 141 1.27 has several database changes since 1.26, and will not work without schema
 142 updates. Note that due to changes to some very large tables like the revision
 143 table, the schema update may take quite long (minutes on a medium sized site,
 144 many hours on a large site).
 145
 146 If upgrading from before 1.11, and you are using a wiki as a commons
 147 repository, make sure that it is updated as well. Otherwise, errors may arise
 148 due to database schema changes.
 149
 150 If upgrading from before 1.7, you may want to run refreshLinks.php to ensure
 151 new database fields are filled with data.
 152
 153 If you are upgrading from MediaWiki 1.4.x or earlier, you should upgrade to
 154 1.5 first. The upgrade script maintenance/upgrade1_5.php has been removed
 155 with MediaWiki 1.21.
 156
 157 Don't forget to always back up your database before upgrading!
 158
 159 See the file UPGRADE for more detailed upgrade instructions.
 160
 161 For notes on 1.26.x and older releases, see HISTORY.
 162
 163 == Online documentation ==
 164
 165 Documentation for both end-users and site administrators is available on
 166 MediaWiki.org, and is covered under the GNU Free Documentation License (except
 167 for pages that explicitly state that their contents are in the public domain):
 168
 169        https://www.mediawiki.org/wiki/Documentation
 170
 171 == Mailing list ==
 172
 173 A mailing list is available for MediaWiki user support and discussion:
 174
 175        https://lists.wikimedia.org/mailman/listinfo/mediawiki-l
 176
 177 A low-traffic announcements-only list is also available:
 178
 179        https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce
 180
 181 It's highly recommended that you sign up for one of these lists if you're
 182 going to run a public MediaWiki, so you can be notified of security fixes.
 183
 184 == IRC help ==
 185
 186 There's usually someone online in #mediawiki on irc.freenode.net.