Hi,

I am trying to create a heat stack with three VMs. I am using get_attr to get some attribute. Below is the excerpt of my template

heat_template_version: 2013-05-23
description: >
  Heat template
parameters:
  key_name:
    type: string
    description : Name of a KeyPair to enable SSH access to the instance
    default: CtrlKey
  instance_type:
    type: string
    description: Instance type for NECC instance
    default: m1.small
    constraints:
      - allowed_values: [m1.small, m1.medium, m1.large]
        description: instance_type must be one of m1.small, m1.medium or m1.large
  image_id:
    type: string
    description: ID of the image to use for the WordPress server
    default: test
    constraints:
      - allowed_values: [ test, test1]
        description: >
          Image ID must be either test or test1
  network_id:
    type: string
    description: ID of the network
    default: 0160deac-bfef-4974-ae1c-a458e22a9ee2
  subnet_id:
    type: string
    description: ID of the subnet
    default: d0cd8dc3-a3a2-4853-afc7-f9d2f986e371
  file_name:
    type: string
    description : Name of a test file
    default: /root/install_file
resources:
 serv_port:
    type: OS::Neutron::Port
    properties:
      fixed_ips:
        - ip_address: 172.31.31.100
      network_id: {get_param: network_id}
 webserv:
    type: OS::Nova::Server
    properties:
      image: { get_param: image_id }
      flavor: { get_param: instance_type }
      key_name: { get_param: key_name }
      networks:
        - port: {get_resource: serv_port}
      user_data:
        str_replace:
          template: |
            #!/bin/bash -v
            echo "Installing" > file
            echo $IP >> file
          params:
            file: { get_param: file_name }
            $IP: { get_attr: [serv_port, fixed_ips, 0, ip_address] }

When I am creating the stack I am getting a long traceback ...

Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/heat/openstack/common/rpc/amqp.py", line 461, in _process_data
    **args)
  File "/usr/lib/python2.6/site-packages/heat/openstack/common/rpc/dispatcher.py", line 172, in dispatch
    result = getattr(proxyobj, method)(ctxt, **kwargs)
  File "/usr/lib/python2.6/site-packages/heat/engine/service.py", line 60, in wrapped
    return func(self, ctx, *args, **kwargs)
  File "/usr/lib/python2.6/site-packages/heat/engine/service.py", line 279, in create_stack
    self._validate_deferred_auth_context(cnxt, stack)
  File "/usr/lib/python2.6/site-packages/heat/engine/service.py", line 225, in _validate_deferred_auth_context
    if not stack.requires_deferred_auth():
  File "/usr/lib/python2.6/site-packages/heat/engine/parser.py", line 324, in requires_deferred_auth
    return any(res.requires_deferred_auth for res in self)
  File "/usr/lib/python2.6/site-packages/heat/engine/parser.py", line 243, in __iter__
    return iter(self.dependencies)
  File "/usr/lib/python2.6/site-packages/heat/engine/parser.py", line 122, in dependencies
    self.resources.itervalues())
  File "/usr/lib/python2.6/site-packages/heat/engine/parser.py", line 167, in _get_dependencies
    resource.add_dependencies(deps)
  File "/usr/lib/python2.6/site-packages/heat/engine/resource.py", line 300, in add_dependencies
    self._add_dependencies(deps, self.name, self.t)
  File "/usr/lib/python2.6/site-packages/heat/engine/resource.py", line 294, in _add_dependencies
    self._add_dependencies(deps, '%s.%s' % (path, key), value)
  File "/usr/lib/python2.6/site-packages/heat/engine/resource.py", line 294, in _add_dependencies
    self._add_dependencies(deps, '%s.%s' % (path, key), value)
  File "/usr/lib/python2.6/site-packages/heat/engine/resource.py", line 294, in _add_dependencies
    self._add_dependencies(deps, '%s.%s' % (path, key), value)
  File "/usr/lib/python2.6/site-packages/heat/engine/resource.py", line 294, in _add_dependencies
    self._add_dependencies(deps, '%s.%s' % (path, key), value)
  File "/usr/lib/python2 ...