currently logged in user keyword

How could I get current logged in user login as svn keyword? Should I write
hook for this purpose? Are there update-hooks at all? I need to make
specific configuration files functionality available. For example, I have
next code in my config.php:
<?php
switch('$login$') {
   case 'user1':
      $conf['dbname'] = 'db1';
      break;
   case 'user2':
      $conf['dbname'] = 'db2';
      break;
   case 'user1':
      $conf['dbname'] = 'db3';
      break;
}
mysql_select_db($conf['dbname']);
?>

Is something planned to develop in future subversion version to handle
configuration files? This is a big issue for me. And not for me, I guess

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