---
- name: Something
  hosts: bigboot
  become: false
  gather_facts: true

  vars:
    shrink_lv_devices:
      - device: "/dev/mapper/system-root"
        size: 81229615104

  tasks:
    - name: Get the mount point info
      ansible.builtin.set_fact:
        shrink_lv_mount_info: "{{ ansible_facts.mounts | selectattr('device', 'equalto', shrink_lv_devices[0].device) }}"

    - name: Debug shrink_lv_mount_info
      ansible.builtin.debug:
        var: shrink_lv_mount_info

    # - name: Assert that the mount point exists
    #   ansible.builtin.assert:
    #     that: (shrink_lv_mount_info | length) >= 1
    #     fail_msg: "Mount point {{ shrink_lv_devices[0].device }} does not exist"

    # - name: Assert that the filesystem is supported
    #   ansible.builtin.assert:
    #     that: shrink_lv_mount_info[0].fstype in ['ext4']
    #     fail_msg: "Unsupported filesystem '{{ shrink_lv_mount_info[0].fstype }}' on '{{ shrink_lv_devices[0].device }}'"