YAML template with empty sections

[Sergey Kraynev]

When I try to create stack using yaml template:

heat_template_version: 2013-05-23
description: >
  A very simple template
parameters:
resources:
  compute_instance:
    type: OS::Nova::Server
    properties:
        name: Hello1
        key_name : heat_key
        image : fedora-20.x86_64
        flavor: m1.small
outputs:
  compute_instance_details:
    value: { get_attr: [compute_instance, networks]}

I get error: "ERROR: 'NoneType' object has no attribute 'iteritems' "
Same behavior you could get, when use template with empty resources or outputs sections (such as parameters in current example).

In other side JSON gives a ability to create such stack (it works without any error):

{
  "AWSTemplateFormatVersion" : "2010-09-09",
  "Parameters" : {
  },
  "Resources" : {
  },
  "Outputs": {
  }
}

The cause of problem is:
yaml create dictionary with key "parameters" ("resources", "outputs") and value None.
Existing code catches situation only when section is absent and does not handle example above.

[Openstack Gerrit (openstack-gerrit)]

Fix proposed to branch: master
Review: https://review.openstack.org/90058

[Openstack Gerrit (openstack-gerrit)]

Reviewed: https://review.openstack.org/90058
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=de2ecff5fd6228f89583955c7e5c42f6a65e9eca
Submitter: Jenkins
Branch: master

commit de2ecff5fd6228f89583955c7e5c42f6a65e9eca
Author: Sergey Kraynev <email address hidden>
Date: Thu Apr 24 06:11:40 2014 -0400

    Allow empty sections in the yaml templates

    Existing check for absent sections in template is not enough for
    handling situation with empty content.
    Current patch improves using default value for parameters, resources and
    outputs sections in yaml templates.

    Change-Id: I94b572bf5f5b1593276616d9d0a84386dd12b8fe
    Closes-Bug: #1312114

[Thiago Martins (martinx)]

I have a stack yaml template that works in Juno, but not on IceHouse.

It triggers this error.

[Steve Baker (steve-stevebaker)]

does it help if you specify the following?

parameters:{}