Get current user in model signal pre_save

I want to collects current user in model signal pre_save, to prevent remove super user permission to current super users.

As I have now so I can not give administrative privileges to a normal user.

from django.db.models.signals import pre_delete, pre_save, post_save
from django.dispatch.dispatcher import receiver
from django.contrib.auth.models import User
from django.core.exceptions import PermissionDenied


@receiver(pre_save, sender=User)
def save_user(sender, instance, **kwargs):
    if instance._state.adding is True:
        # we would need to create the object
        print "Creating an object"
    else:
        #we are updating the object
        if instance.is_superuser:
            raise PermissionDenied

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