Open Stack

Hi team,

I would like to start my question by using a sample template:

heat_template_version: 2014-10-16
parameters:
  count:
    type: number
    default: 5
  removal_list:
    type: comma_delimited_list
    default: []
resources:
  sample_group:
    type: OS::Heat::ResourceGroup
    properties:
      count: {get_param: count}
      removal_policies: [{resource_list: {get_param: removal_list}}]
      resource_def:
        type: testnested.yaml
outputs:
  resource_list:
value: # How to output a list of resources of sample_group? Like "resource_list: ['0', '1', '2', '3', '4']"?

As showed above, this template has a resource group that contains resources defined in a nested template. First, I am going to use this template to create a stack. Then, I am going to update the stack to scale down the resource group by specifying (through parameters) a subset of resources that I want to remove. For example,

$  heat stack-create -f test.yaml test

$ heat stack-show test

$ heat stack-update -f test.yaml -P "count=3;removal_list=1,3" test

I want to know if it is possible to output a "resource_list" that lists all the removal candidate, so that I can programmatically process the list to compile another list (that is "removal_list") which will be passed back to the template as a parameter. Any help will be appreciated.

Thanks,
Honbgin
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