Unable to add DNS record alone to Rackspace Cloud DNS resource

[Jason Dunsmore]

Submitting a template with a Rackspace::Cloud::DNS resource and then updating that template with a new record, but no changes to the domain properties, results in the following traceback:

Traceback (most recent call last):
  File "/opt/stack/heat/heat/engine/resource.py", line 455, in _action_recorder
    yield
  File "/opt/stack/heat/heat/engine/resource.py", line 710, in update
    args=[after, tmpl_diff, prop_diff])
  File "/opt/stack/heat/heat/engine/scheduler.py", line 294, in wrapper
    step = next(subtask)
  File "/opt/stack/heat/heat/engine/resource.py", line 496, in action_handler_task
    handler_data = handler(*args)
  File "/usr/local/lib/heat/rackspace/cloud_dns.py", line 181, in handle_update
    dom.update(**prop_diff)
  File "/usr/local/lib/python2.7/dist-packages/pyrax/clouddns.py", line 161, in update
    ttl=ttl, comment=comment)
  File "/usr/local/lib/python2.7/dist-packages/pyrax/clouddns.py", line 695, in update_domain
    "No settings provided to update_domain().")
MissingDNSSettings: No settings provided to update_domain().

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/131571

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/131571
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=b1a697e74f6464d78a9071bbd0c5517eac706a00
Submitter: Jenkins
Branch: master

commit b1a697e74f6464d78a9071bbd0c5517eac706a00
Author: Jason Dunsmore <email address hidden>
Date: Tue Oct 28 16:06:26 2014 -0500

    Check prop_diff contents after modifying it

    It is not possible to add a DNS record alone to the Rackspace Cloud DNS
    resource because the domain.update() method will be called with no
    arguments. Re-check the contents of prop_diff after modifying it to see
    if calling domain.update() is necessary.

    Change-Id: I04e313eab7f2d8971e9f12bfb402259b48757919
    Closes-Bug: #1386886