Ansible environment directive

- hosts: localhost
  gather_facts: no
  vars:
    site: example.com
    user: bob
    scheme: https
    env_path: "{{ playbook_dir }}/tmp/environment"
    ansible_connection: local
  tasks:
    - name: Create /etc/environment
      copy:
        dest: "{{ env_path }}"
        content: |
          SITE={{ site }}
          USER={{ user }}
          SCHEME={{ scheme }}

    - name: |
        Print site variable using environment
        According to the documentation: https://docs.ansible.com/ansible/devel/collections/ansible/builtin/env_lookup.html#synopsis the env lookup ONLY works for variables that exist when you called the playbook.
        So this will fail unless you call it like this:
        SITE=example.edu ansible-playbook t.yml
        Remember too, using lookup ONLY works on the controller
      debug:
        msg: "{{ lookup('env', 'SITE') }}"
      environment:
        SITE: "{{ site }}"

    - name: Print site variable using jinja
      debug:
        msg: "{{ site }}"

    - name: Use variable in shell using environment
      shell: "echo $SCHEME://$SITE"
      environment:
        SCHEME: "{{ scheme }}"
        SITE: "{{ site }}"

    - name: Use variable in shell using jinja
      shell: "echo {{ scheme }}://{{ site }}"

    - name: Display set HOME variable (just to know it's working)
      debug:
        msg: "{{ lookup('env', 'HOME') }}"

    - name: Display unset SITE variable
      debug:
        msg: "{{ lookup('env', 'SITE') }}"

    - block:
        - name: Parse and display /etc/environment variables as a dictionary
          debug:
            msg: "{{ parsed_environment }}"

        - name: |
            Parse the /etc/environment variables and display only the SITE variable (but ONLY if you're running this on localhost because lookups ALWAYS run on localhost and not the remote machine)
            According to the documentation: https://docs.ansible.com/ansible/devel/collections/ansible/builtin/env_lookup.html#synopsis the env lookup ONLY works for variables that exist when you called the playbook.
            So this will fail unless you call it like this:
            SITE=example.edu ansible-playbook t.yml
        Remember too, using lookup ONLY works on the controller
          debug:
            msg: "{{ lookup('env', 'SITE') }}"
          environment: |
            {{ parsed_environment }}

        - name: Parse the /etc/environment variables and use the SITE variable in a shell call using environment
          shell: "echo $SITE"
          environment: |
            {{ parsed_environment }}

        - name: use the site variable in a shell call using jinja
          shell: "echo {{ site }}"
          environment: |
            {{ parsed_environment }}
      vars:
        parsed_environment: "{{ lookup('file', env_path).split('\n') | map('split', '=') | list | community.general.dict }}"