shell output

node# cat myuuid.fact
"e48aeb68-ebb7-4e53-971d-0b4b59d242c4"

--- 

master# ansible cloudini-hosts -m setup -a "filter=ansible_local"

bu-x40092.appnor.net | SUCCESS => {
    "ansible_facts": {
        "ansible_local": {
            "myuuid": "e48aeb68-ebb7-4e53-971d-0b4b59d242c4"
        }
    },
    "changed": false
}

uuid.yml

---
- name: uuidgen for libvirtd config
  hosts: cloudini-hosts
  gather_facts: True
  # facts.d will automatically be read, so that myuuidgen will be populated if it is defined
  tasks:
    - name: create directory for ansible custom facts
      file: state=directory recurse=yes path=/etc/ansible/facts.d

    - name: run uuidgen if necessary
      shell: uuidgen
      register: uuidgen
      when: myuuid is not defined

    - name: save to facts
      set_fact:
        myuuid: "{{ uuidgen.stdout }}"
      when: myuuid is not defined

    - name: save to facts.d
      template:
        src: templates/uuid_template.j2
        dest: /etc/ansible/facts.d/myuuid.fact
        force: False

    - name: re-read facts
      setup: filter=ansible_local

    - name: configure libvirtd.conf with myuuid
      template:
        src: templates/libvirtd.conf.j2
        dest: /etc/libvirt/libvirtd.conf
        force: True

uuid_template.j2

{{ myuuid | to_nice_json }}