gistfile1.txt

- name: "Create temporary public keys directory"
  become_user: jenkins
  become: yes
  tempfile:
     state: directory
     suffix: keys
  register: output

- name: "Capture all slaves host keys into known_hosts"
  become: yes
  become_user: jenkins
  shell: |
      exists=$(grep {{ item }} ~/.ssh/known_hosts) || true
      if [ -z "$exists" ]; then
        ssh-keyscan {{ item }} -t rsa >> ~/.ssh/known_hosts
      fi
  with_items:
     - gtx1
     - gtx3
     - gtx4
     - gtx6
     - gtx7

- name: "Gather all slave machines public keys"
  become: yes
  become_user: jenkins
  shell: |
     scp jenkins@{{ item }}:/home/jenkins/.ssh/id_rsa.pub {{ output.path }}/{{ item }}_id_rsa.pub
  with_items:
     - gtx1
     - gtx3
     - gtx4
     - gtx6
     - gtx7

- name: "Combine all slave machines public keys"
  become: yes
  become_user: jenkins
  shell: |
    cd  {{ output.path }}
    for k in $(ls *id_rsa.pub); do
        cat $k >> combined.pub
        echo "" >> combined.pub
    done

- name: "Slurp all slave machines public keys"
  become: yes
  slurp:
      src: "{{ output.path }}/combined.pub"
  register: keys

- name: "Inject all slave machines public keys into authorized keys"
  become: yes
  authorized_key:
      user: jenkins
      key: "{{ keys['content'] | b64decode }}"
      state: present

- name: "Removing temporary public keys directory"
  become: yes
  file:
    path: "{{ output.path }}"
    state: absent