def check_job_dependencies(host_objects, job_dependencies):
 host_ids = [host.id for host in host_objects]
 hosts_in_job = models.Host.objects.filter(id__in=host_ids)
 ok_hosts = hosts_in_job
 for (index, dependency) in enumerate(job_dependencies):
  ok_hosts = ok_hosts.filter(labels__name=dependency)
 failing_hosts = (set((host.hostname for host in host_objects)) - set((host.hostname for host in ok_hosts)))
 if failing_hosts:
  raise model_logic.ValidationError({'hosts': ((('Host(s) failed to meet job dependencies (' + ', '.join(job_dependencies)) + '): ') + ', '.join(failing_hosts))})

def check_job_dependencies ( host_objects , job_dependencies ) : host_ids = [ host . id for host in host_objects ] hosts_in_job = models . Host . objects . filter ( id__in = host_ids ) ok_hosts = hosts_in_job for ( index , dependency ) in enumerate ( job_dependencies ) : ok_hosts = ok_hosts . filter ( labels__name = dependency ) failing_hosts = ( set ( ( host . hostname for host in host_objects ) ) - set ( ( host . hostname for host in ok_hosts ) ) ) if failing_hosts : raise model_logic . ValidationError ( { 'hosts' : ( ( ( 'Host(s) failed to meet job dependencies (' + ', ' . join ( job_dependencies ) ) + '): ' ) + ', ' . join ( failing_hosts ) ) } )
check that a set of machines satisfies a jobs dependencies .