Is there a simple way to inject a dependency into every repository instance in Doctrine2 ?

I have tried listening to the loadClassMetadata event and using setter injection on the repository but this naturally resulted in a infinite loop as calling getRepository in the event triggered the same event.

After taking a look at the Doctrine\ORM\EntityManager::getRepository method it seems like repositories are not using dependency injection at all, instead they are instantiated at the function level:

public function getRepository($entityName)
{
    $entityName = ltrim($entityName, '\\');
    if (isset($this->repositories[$entityName])) {
        return $this->repositories[$entityName];
    }

    $metadata = $this->getClassMetadata($entityName);
    $customRepositoryClassName = $metadata->customRepositoryClassName;

    if ($customRepositoryClassName !== null) {
        $repository = new $customRepositoryClassName($this, $metadata);
    } else {
        $repository = new EntityRepository($this, $metadata);
    }

    $this->repositories[$entityName] = $repository;

    return $repository;
}

Any ideas ?