---
# Ensure Swarming has been bootstrapped.
- hosts: all
  vars:
    swarming_path: /b/s
    bootstrap_script_path: "{{ home }}/bootstrap-swarming.py"
  tasks:
  - name: Check if host has already been bootstrapped
    stat:
      path: "{{ swarming_path }}"
    register: results
  - debug:
      msg: Did we find an existing Swarming installation? {{ results.stat.exists }}
  - when: not results.stat.exists
    block:
      - name: Retrieve authorization token
        run_once: true
        delegate_to: localhost
        uri:
          url: http://metadata/computeMetadata/v1/instance/service-accounts/default/token
          headers:
            Metadata-Flavor: "Google"
          return_content: yes
        register: auth_token
      - name: Download Swarming bootstrap script {{ bootstrap_script_path }}
        get_url:
          url: "{{ swarming_server }}/bootstrap"
          headers:
            Authorization: Bearer {{ auth_token.json.access_token }}
          dest: "{{ bootstrap_script_path }}"
      - name: Bootstrap Swarming (triggers reboot, so expected to fail)
        command: python -u {{ bootstrap_script_path }}
        ignore_errors: True
      - name: Wait for reboot after bootstrapping Swarming
        wait_for_connection:
          # Don't start checking before the Swarming bootstrap script initiates a reboot.
          delay: 30
          # Only wait for 3 minutes before failing. (Default is 10 min.)
          timeout: 180
      - name: Check if bootstrap was successful
        stat:
          path: "{{ swarming_path }}"
        register: results2
      - when: not results2.stat.exists
        fail:
          msg: "{{ swarming_path }} does not exist after bootstrapping."