ansible-roles/remount-usr/tasks/main.yml

---
# findmnt returns 0 on hit, 1 on miss
# If the return code is higher than 1, it's a blocking failure

- name: "check if /usr is a read-only partition"
  ansible.builtin.command:
    cmd: 'findmnt /usr --noheadings --options ro'
  changed_when: False
  failed_when: usr_partition.rc > 1
  register: usr_partition
  check_mode: False

- name: "mount /usr in rw"
  ansible.builtin.command:
    cmd: 'mount --options remount,rw /usr'
  when: usr_partition.rc == 0
  notify: remount usr
  changed_when: False