mount.yml

---
- hosts: localhost

  vars:
    - alternate_id: 10100
    - host_os: 'darwin'
    - host_gid: 20
    - host_uid: 500
    - web_group: 'www-data'

  tasks:

    - name: Find user matching host UID
      shell: "getent passwd {{ host_uid }} | cut -d: -f1"
      register: matching_user

    - name: Move matching user out of the way
      user:
        name: "{{ matching_user.stdout }}"
        uid: "{{ alternate_id }}"
      when: matching_user.stdout != ''

    - name: Find group matching host GID
      shell: "getent group {{ host_gid }} | cut -d: -f1"
      register: matching_group

    - name: Move the matching group out of the way
      group:
        name: "{{ matching_group.stdout }}"
        gid: "{{ alternate_id }}"
      when: matching_group.stdout != ''

    - name: Re-map group ownership of any files owned by matching group
      command: "/usr/bin/find / -group {{ host_gid }} -not -path \"/proc/*\" -exec chgrp -h {{ alternate_id }} {} ';'"
      when: matching_group.stdout != ''

    - name: Find web-group GID
      shell: "getent passwd {{ web_group }} | cut -d: -f3"
      register: web_group_gid

    - name: Map web group to host GID
      group:
        name: "{{ web_group }}"
        gid: "{{ host_gid }}"
      when: web_group_gid.stdout != ''

    - name: Re-map group ownership of any files owned by web group
      command: "/usr/bin/find / -group {{ web_group_gid.stdout }} -not -path \"/proc/*\" -exec chgrp -h {{ host_gid }} {} ';'"
      when: web_group_gid.stdout != ''