Synnefo

#

# Various utility functions

#

# Copyright 2010 Greek Research and Technology Network

#

from django.conf import settings

from db.models import VirtualMachine

def id_from_instance_name(name):

    """Returns VirtualMachine's Django id, given a ganeti machine name.

    Strips the ganeti prefix atm. Needs a better name!

    """

    if not str(name).startswith(settings.BACKEND_PREFIX_ID):

        raise VirtualMachine.InvalidBackendIdError(str(name))

    ns = str(name).lstrip(settings.BACKEND_PREFIX_ID)

    if not ns.isdigit():

        raise VirtualMachine.InvalidBackendIdError(str(name))

    return int(ns)