Here's the code for overriding the action. Basically just copied part of the actual FOS action and modded.
Create a RegistrationController.php file in your user bundle's controller folder and put the overriding RegistrationController class in there.
Assuming your user bundle is Acme\UserBundle:
<?php
// Acme\UserBundle\RegistrationController.php
namespace Acme\UserBundle\Controller;
use Symfony\Component\HttpFoundation\RedirectResponse;
use FOS\UserBundle\Controller\RegistrationController as BaseController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
class RegistrationController extends BaseController
{
/**
* Receive the confirmation token from user email provider, login the user
*/
public function confirmAction(Request $request, $token)
{
$userManager = $this->container->get('fos_user.user_manager');
$user = $userManager->findUserByConfirmationToken($token);
if (null === $user) {
/* ************************************
*
* User with token not found. Do whatever you want here
*
* e.g. redirect to login:
*
* return new RedirectResponse($this->container->get('router')->generate('fos_user_security_login'));
*
**************************************/
}
else{
// Token found. Letting the FOSUserBundle's action handle the confirmation
return parent::confirmAction($request, $token);
}
}
}