# Set as read-only
$wgReadOnly = ( PHP_SAPI === 'cli' ) ? false : 'This wiki is currently being upgraded to a newer software version. Please check back in a couple of hours.';
$wgMessageCacheType = $wgMainCacheType = $wgParserCacheType = $wgSessionCacheType = CACHE_NONE;
$wgLocalisationCacheConf['storeClass'] = 'LCStoreNull';

# Disable editing - optional since only affects ACLs
$wgGroupPermissions['*']['edit'] = false;
$wgGroupPermissions['user']['edit'] = false;
$wgGroupPermissions['sysop']['edit'] = false;

# Disable new user registrations
$wgGroupPermissions['*']['createaccount'] = false;
$wgGroupPermissions['sysop']['createaccount'] = false;

# Hide login link
$wgHooks['SkinTemplateNavigation::Universal'][] = function ( $skinTemplate, &$links ) {
	unset( $links['user-menu']['createaccount'] );
	unset( $links['user-menu']['login'] );
	unset( $links['user-menu']['login-private'] );
	unset( $links['user-menu']['anoncontribs'] );
};