How to skip local_action if file exists?

[Stuart Reynolds]

I'm trying to write a set of tasks to create an ec2 key_pair (if one doesn't exist) and save it to svn.

Sadly, ec2_key is quite slow for me, even if the key already exists (maybe my network?). How can I prevent this task step from being run if I already have a key file locally? 

... other modules include things like "creates:". It would be nice if this logic was available the task level.

- Stu

PS: is there a complete documentation of a the keys in a task object?  (name:, local_action:, ... what else?)

PPS. does anyone how to use variable in the text for a name?

- name: "Create a key for {{ cluster_name }}"  # Output includes the braces :(
  hosts: localhost
  tags:
    - provision
  gather_facts: false # Prevents immediately logging into hosts
  vars:
    # Allow override of key name
    key_name: "{{instance_key_name | default(cluster_name)}}"
  tasks:

  - name: Ensure key file exists on AWS
    local_action:
      module: ec2_key
      name: "{{key_name}}"
      region: "{{instance_region}}"
    register: result
   ###
   ## How to prevent running if {{cluster_name}}/{{key_name}}.pem exists
   ###

  - name: Ensure key file exists locally
    local_action: copy content="{{result.key.private_key}}" dest="{{cluster_name}}/{{key_name}}.pem"
    when: "result.changed"

  - name: Ensure key file is added to SVN
    local_action: command "svn add {{cluster_name}}/{{key_name}}.pem"
    when: "result.changed"

[Michael DeHaan]

Start by trying something like this:

- local_action: stat path=foo

  register: stat_result

- debug: var=stat_result

Then use the stat_result in the conditional

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[Stuart Reynolds]

Nifty. Thx.