playbook from Apr 1 demo. (not intentionally an April fool's gag)

playbook.yml

---
- hosts: localhost
  connection: local  # also run as: ansible-playbook -vv --connection=local  playbook.yml
  become: yes

  vars:
    plain_old_username: username
    repos_install_dir: /opt/repositories/

  tasks:

    - name: "Update apt cache"
      apt:
        update_cache: yes
        cache_valid_time: 3600


    - name: "get disk availability"
      register: main_disk_kb
      become: false   # to make extra sure we didn't change anything
      changed_when: false # logically this shell cmd never changes anything
      shell: df -P /usr/lib | tail -1 | tr -s ' ' | cut -d ' ' -f4
      args:
        executable: /bin/bash

    - name: "Print some debug info"
      debug:
        msg: "main_disk_kb available is {{ main_disk_kb.stdout }}"

    - name: "Fail if insufficient disk space"
      fail: msg="You probably want more disk space. Either get some or comment out this fail."
      when: "(main_disk_kb.stdout | int) < 15000000"

    # - name: "apt ubuntu-desktop"
    #   async: 1800
    #   poll: 15  # this way we can at least see action with '-vvv'
    #   apt: # we assume update_cache was done earlier in book!
    #     name: "{{ item.name }}"
    #     state: "{{ item.state }}"
    #   with_items:
    #     - { state: "latest", name: "ubuntu-desktop" }

    - name: "our build chain deps"
      apt: # we assume update_cache was done earlier in book!
        name: "{{ item.name }}"
        state: "{{ item.state }}"
      with_items:
        - { state: "latest", name: "clang-format" }
        - { state: "latest", name: "clang-tidy" }

    - name: "nice-to-have apt stuff"
      apt: # we assume update_cache was done earlier in book!
        name: "{{ item.name }}"
        state: "{{ item.state }}"
      with_items:
        - { state: "latest", name: "caffeine" }
        - { state: "latest", name: "graphviz" }
        - { state: "latest", name: "gtk-recordmydesktop" }
        - { state: "latest", name: "htop" }
        - { state: "latest", name: "imagemagick" }
        - { state: "latest", name: "jq" }
        - { state: "latest", name: "mediainfo" }
        - { state: "latest", name: "source-highlight" }
        - { state: "latest", name: "splitpatch" }
        - { state: "latest", name: "sqlite" }
        - { state: "latest", name: "stress" }
        - { state: "latest", name: "tree" }
        - { state: "latest", name: "wmctrl" }
        - { state: "latest", name: "xclip" }


    # (among others?) this is part of endless hist
    - name: "Ensure installation directory exists"
      file:
        path: "{{ repos_install_dir }}"
        state: directory
        owner: "{{ plain_old_username }}"
        group: "{{ plain_old_username }}"
        mode: '0755'