Use of register variable in following play(s)

[Dimitri Yioulos]

Good day.

I need to make changes in the know_hosts files of users on various hosts. I'll use a script to do the actual changes in known_hosts. I have the following simple playbook, so far. It identifies users with known_host files:

---

- hosts: all
  gather_facts: false
  become: yes

  tasks:

    - name: find known hosts
      shell: find /root /home -type f -name known_hosts
      register: known

    - debug: msg="{{ known.stdout }}"

It produces the following output:

ok: [host1] =>
  msg: |-
    /root/.ssh/known_hosts
    /home/user1/.ssh/known_hosts
    /home/user2/.ssh/known_hosts
    /home/user3/.ssh/known_hosts
ok: [host2] =>
  msg: |-
    /root/.ssh/known_hosts
    /home/user1/.ssh/known_hosts
    /home/user2/.ssh/known_hosts
    /home/user3/.ssh/known_hosts
    /home/user4/.ssh/known_hosts
    /home/user5/.ssh/known_hosts
ok: [host3] =>
  msg: /root/.ssh/known_hosts
ok: [host4] =>
  msg: |-
    /root/.ssh/known_hosts
    /home/user1/.ssh/known_hosts
    /home/user2/.ssh/known_hosts
    /home/user3/.ssh/known_hosts
~

I want to apply the script against the known_hosts file for each of the identified users. How do I do that?

[Dick Visser]

I would use the dedicated find task. Apply a depth filter just in case.

Something like this should do the trick:

- name: known hosts script play
  hosts: all
  become: true
  gather_facts: false

  tasks:
    - name: Find known hosts
      ansible.builtin.find:
        paths:
          - /root
          - /home
        patterns: known_hosts
        recurse: true
        depth: 3
      register: found

    - name: Change known_host file
      ansible.builtin.script:
        cmd: foo.sh "{{ item }}"
      loop: "{{ found.files|map(attribute='path') }}"

foo.sh is a script on your controller, adjacent to your playbook.

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[Dimitri Yioulos]

Thank you, Dick!