Playing Guess Who with Ansible

.ssh_config

Host rpi1
    HostName raspberrypi1.local
    User pi

Host rpi2
    HostName raspberrypi2.local
    User pi

inventory.yml

all:
  hosts:
    rpi1:
    rpi2:
      ansible_user: pi
  vars:
    ansible_become_method: sudo
    ansible_python_interpreter: python3

results

$ ANSIBLE_STDOUT_CALLBACK=yaml ansible-playbook -i inventory.yml playbook.yml 

PLAY [whoami, play level become=false] ****************************************************************************************************************************************************************************************************

TASK [Gathering Facts] ********************************************************************************************************************************************************************************************************************
ok: [rpi2]
ok: [rpi1]

TASK [become=false,ansible_user] **********************************************************************************************************************************************************************************************************
ok: [rpi1] => 
  ansible_user: VARIABLE IS NOT DEFINED!
ok: [rpi2] => 
  ansible_user: pi

TASK [become=false,ansible_facts.user_id] *************************************************************************************************************************************************************************************************
ok: [rpi1] => 
  ansible_facts.user_id: pi
ok: [rpi2] => 
  ansible_facts.user_id: pi

TASK [become=false,ansible_facts.env.USER] ************************************************************************************************************************************************************************************************
ok: [rpi1] => 
  ansible_facts.env.USER: pi
ok: [rpi2] => 
  ansible_facts.env.USER: pi

TASK [become=false,lookuo(whoami)] ********************************************************************************************************************************************************************************************************
ok: [rpi1] => 
  msg: alex
ok: [rpi2] => 
  msg: alex

TASK [become=true,ansible_user] ***********************************************************************************************************************************************************************************************************
ok: [rpi1] => 
  ansible_user: VARIABLE IS NOT DEFINED!
ok: [rpi2] => 
  ansible_user: pi

TASK [become=true,ansible_facts.user_id] **************************************************************************************************************************************************************************************************
ok: [rpi1] => 
  ansible_facts.user_id: pi
ok: [rpi2] => 
  ansible_facts.user_id: pi

TASK [become=true,ansible_facts.env.USER] *************************************************************************************************************************************************************************************************
ok: [rpi1] => 
  ansible_facts.env.USER: pi
ok: [rpi2] => 
  ansible_facts.env.USER: pi

TASK [become=true,lookuo(whoami)] *********************************************************************************************************************************************************************************************************
ok: [rpi1] => 
  msg: alex
ok: [rpi2] => 
  msg: alex

PLAY [whoami, play level become=true] *****************************************************************************************************************************************************************************************************

TASK [Gathering Facts] ********************************************************************************************************************************************************************************************************************
ok: [rpi2]
ok: [rpi1]

TASK [become=false,ansible_user] **********************************************************************************************************************************************************************************************************
ok: [rpi1] => 
  ansible_user: VARIABLE IS NOT DEFINED!
ok: [rpi2] => 
  ansible_user: pi

TASK [become=false,ansible_facts.user_id] *************************************************************************************************************************************************************************************************
ok: [rpi1] => 
  ansible_facts.user_id: root
ok: [rpi2] => 
  ansible_facts.user_id: root

TASK [become=false,ansible_facts.env.USER] ************************************************************************************************************************************************************************************************
ok: [rpi1] => 
  ansible_facts.env.USER: root
ok: [rpi2] => 
  ansible_facts.env.USER: root

TASK [become=false,lookuo(whoami)] ********************************************************************************************************************************************************************************************************
ok: [rpi1] => 
  msg: alex
ok: [rpi2] => 
  msg: alex

TASK [become=true,ansible_user] ***********************************************************************************************************************************************************************************************************
ok: [rpi1] => 
  ansible_user: VARIABLE IS NOT DEFINED!
ok: [rpi2] => 
  ansible_user: pi

TASK [become=true,ansible_facts.user_id] **************************************************************************************************************************************************************************************************
ok: [rpi1] => 
  ansible_facts.user_id: root
ok: [rpi2] => 
  ansible_facts.user_id: root

TASK [become=true,ansible_facts.env.USER] *************************************************************************************************************************************************************************************************
ok: [rpi1] => 
  ansible_facts.env.USER: root
ok: [rpi2] => 
  ansible_facts.env.USER: root

TASK [become=true,lookuo(whoami)] *********************************************************************************************************************************************************************************************************
ok: [rpi1] => 
  msg: alex
ok: [rpi2] => 
  msg: alex

PLAY RECAP ********************************************************************************************************************************************************************************************************************************
rpi1                       : ok=18   changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
rpi2                       : ok=18   changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

$ ansible-playbook --version
ansible-playbook 2.9.11
  config file = /home/alex/.ansible.cfg
  configured module search path = ['/home/alex/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/alex/venv/lib/python3.8/site-packages/ansible
  executable location = /home/alex/venv/bin/ansible-playbook
  python version = 3.8.2 (default, Jul 16 2020, 14:00:26) [GCC 9.3.0]

whoami.yml

- name: whoami, play level become=false
  hosts: rpi1,rpi2
  become: false
  tasks:
    - {name: "become=false,ansible_user",           become: false, debug: {var: ansible_user}}
    - {name: "become=false,ansible_facts.user_id",  become: false, debug: {var: ansible_facts.user_id}}
    - {name: "become=false,ansible_facts.env.USER", become: false, debug: {var: ansible_facts.env.USER}}
    - {name: "become=false,lookuo(whoami)",         become: false, debug: {msg: "{{ lookup('lines', 'whoami') }}"}}

    - {name: "become=true,ansible_user",            become: true,  debug: {var: ansible_user}}
    - {name: "become=true,ansible_facts.user_id",   become: true,  debug: {var: ansible_facts.user_id}}
    - {name: "become=true,ansible_facts.env.USER",  become: true,  debug: {var: ansible_facts.env.USER}}
    - {name: "become=true,lookuo(whoami)",          become: true,  debug: {msg: "{{ lookup('lines', 'whoami') }}"}}


- name: whoami, play level become=true
  hosts: rpi1,rpi2
  become: true
  tasks:
    - {name: "become=false,ansible_user",           become: false, debug: {var: ansible_user}}
    - {name: "become=false,ansible_facts.user_id",  become: false, debug: {var: ansible_facts.user_id}}
    - {name: "become=false,ansible_facts.env.USER", become: false, debug: {var: ansible_facts.env.USER}}
    - {name: "become=false,lookuo(whoami)",         become: false, debug: {msg: "{{ lookup('lines', 'whoami') }}"}}

    - {name: "become=true,ansible_user",            become: true,  debug: {var: ansible_user}}
    - {name: "become=true,ansible_facts.user_id",   become: true,  debug: {var: ansible_facts.user_id}}
    - {name: "become=true,ansible_facts.env.USER",  become: true,  debug: {var: ansible_facts.env.USER}}
    - {name: "become=true,lookuo(whoami)",          become: true,  debug: {msg: "{{ lookup('lines', 'whoami') }}"}}