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Using the following configuration from the toolserver:

$wgForeignFileRepos[] = array(
  'class' => 'ForeignDBRepo',
  'name'  => 'shared',
  'url'   => 'http://upload.wikimedia.org/wikipedia/commons/',
  'hashLevels' => 2,
  'dbType' => 'mysql',
  'dbServer' => 'commonswiki-p.rrdb',
  'dbName' => 'commonswiki_p',
  'dbUser' => $wgDBuser,
  'dbPassword' => $wgDBpassword
);

api.php returns the following:

<?xml version="1.0"?>
<api servedby="wolfsbane">
  <error code="internal_api_error_DBConnectionError" info="Exception Caught: DB connection error:  Can&#039;t connect to local MySQL server through socket &#039;/tmp/mysql.sock&#039; (2)" xml:space="preserve">

#0 /home/valhallasw/src/phase3/includes/db/DatabaseMysql.php(131): DatabaseBase->reportConnectionError(' Can't connect ...')
#1 /home/valhallasw/src/phase3/includes/db/Database.php(518): DatabaseMysql->open(false, 'valhallasw', '...', 'commonswiki_p')
#2 /home/valhallasw/src/phase3/includes/db/Database.php(566): DatabaseBase->__construct(false, 'valhallasw', '...', 'commonswiki_p', 0, 'get from global')
#3 /home/valhallasw/src/phase3/includes/filerepo/ForeignDBRepo.php(47): DatabaseBase::newFromType('mysql', Array)
#4 /home/valhallasw/src/phase3/includes/filerepo/LocalFile.php(257): ForeignDBRepo->getMasterDB()
#5 /home/valhallasw/src/phase3/includes/filerepo/LocalFile.php(328): LocalFile->loadFromDB()
#6 /home/valhallasw/src/phase3/includes/filerepo/LocalFile.php(556): LocalFile->load()
#7 /home/valhallasw/src/phase3/includes/filerepo/FileRepo.php(120): LocalFile->exists()
#8 /home/valhallasw/src/phase3/includes/filerepo/FileRepo.php(173): FileRepo->findFile(Object(Title), Array)
#9 /home/valhallasw/src/phase3/includes/filerepo/RepoGroup.php(188): FileRepo->findFiles(Array)
#10 /home/valhallasw/src/phase3/includes/api/ApiQueryImageInfo.php(81): RepoGroup->findFiles(Array)
#11 /home/valhallasw/src/phase3/includes/api/ApiQuery.php(268): ApiQueryImageInfo->execute()
#12 /home/valhallasw/src/phase3/includes/api/ApiMain.php(667): ApiQuery->execute()
#13 /home/valhallasw/src/phase3/includes/api/ApiMain.php(351): ApiMain->executeAction()
#14 /home/valhallasw/src/phase3/includes/api/ApiMain.php(335): ApiMain->executeActionWithErrorHandling()
#15 /home/valhallasw/src/phase3/api.php(130): ApiMain->execute()
#16 /home/valhallasw/src/tsapi/api.php(83): require('/home/valhallas...')
#17 {main}

</error>
</api>

This has probably been introduced in r80864.