Files in this repository are almost a mirror of Wikimedia Foundation's production configuration of MediaWiki. Omitted files include passwords and security measures.
dblists/ : List of wiki databases.
For labs-only dblists, add "-labs" suffix before the file extension.
errorpages/ : Central management of error pages used by app servers at the PHP or Apache level.
wikiversions.json, wikiversions.php wikiversions-labs.json, wikiversions-labs.php : Let us associate a database with a specific copy of MediaWiki (generally a branch). The .php file is updated by editing wikiversions.json first and then running multiversion/updateWikiversions.
debug.json : Configuration for X-Wikimedia-Debug. The browser extensions use this to determine which app servers are available to use as debug backends.
docroot/ : The Apache document roots for most of our VirtualHosts.
static/ : Static files available under all docroots as /static.
Contains icons and images used by MediaWiki, such as project logos, favicons, CentralAuth SUL icons and more.
images/ : Deprecated aliases for a subset of files in /static/images.
w/ : The w/ directory in the docroot of any MediaWiki-serving VirtualHost.
tests/ : Holds some PHPUnit tests.
wmf-config/ : The MediaWiki configuration for all database.
Think of it like a huge LocalSettings.php.
wmf-config/CommonSettings.php : Generic configuration such as including extensions or calling over piece of configuration. This is mostly shared among all wikis.
wmf-config/InitialiseSettings.php : Per-wiki configuration.
wmf-config/db-*.php : Databases related configuration.
wmf-config/mc.php : Memcached configuration.
wmf-config/*-labs.php : Files used by the Beta Cluster to override production settings.