ansible - set fact for all hosts in play, when only one host has a met condition

Question

Using Ansible v2.9.12

Question: How do I set a variable for all hosts in the play, when at least one host has a certain condition which is met.

Example:

- hosts:
    - host1
    - host2
    - host3
    - host4
  tasks:
    - stat:
        path: /tmp/file
      register: something

    - set_fact
        something: true
      when: something <at least one of the hosts has /tmp/file>
 

Now, only host4 has /tmp/file present in it's filesystem. How would I set the fact for all hosts in this case?

Answer 1

With help from Vladimir Botka:

---
- hosts:
    - test-multi-03
    - test-multi-02
    - test-multi-01
  tasks:
    - name: stat file
      stat:
        path: /tmp/file
      register: status

    - block:

        - name: create dictionary
          set_fact:
            status: "{{ dict(keys|zip(values)) }}"
          vars:
            keys: "{{ ansible_play_hosts }}"
            values: "{{ ansible_play_hosts|
                        map('extract', hostvars, ['status','stat','exists'])
                        | list }}"

        - name: set fact when file is present on at least one host, for all hosts
          set_fact:
            something: yeah
          when: status.values() | list is any

      run_once: true

    - debug:
        msg: "{{ something }}"
      when: something is defined