Getting pointers on updating a deploy role for ansible

bad.yml

- name: add deploy key for deploy user, if there is one
  copy: >
    src={{ deploy_user_ssh_priv_key_path }}
    dest=/home/{{ deploy_user_name }}/.ssh/deploy
    mode=600
    owner={{ deploy_user_name}}
    group={{ deploy_user_name }}
  sudo: yes
  when: deploy_user_ssh_priv_key_path

good.yml

- name: check that a deploy_key exists
  stat: >
    path=deploy_user_ssh_priv_key_path
  run_once: true
  delegate_to: localhost
  register: deploy_key_exists
  

- name: add deploy key for deploy user, if there is one
  copy:
    src: {{ deploy_user_ssh_priv_key_path }}
    dest: /home/{{ deploy_user_name }}/.ssh/deploy
    mode: 600
    owner: {{ deploy_user_name}}
    group: {{ deploy_user_name }}
  sudo: yes
  when: deploy_key.exists