- name: Set a constant defining number of Bytes in 1 GB
  set_fact:
    const_bytes_in_gb: 1073741824

- name: Stat volume directories
  stat:
    path: "{{ item.mount }}"
  with_items: "{{ volumes }}"
  register: volumes_stat

- name: Initialize existing_volumes to an empty array
  set_fact:
    existing_volumes="{{ [] }}"

- name: Filter out non-existing volumes
  set_fact:
    existing_volumes: "{{ existing_volumes +[item.item] }}"
  with_items: "{{ volumes_stat.results }}"
  when: item.stat.exists
  loop_control:
    label: "{{ item.item.mount }}"

- name: Loop on volumes and gather available space
  shell: df -B1 {{ item.mount }} --output=avail | sed 1d
  register: volume_size
  with_items: "{{ existing_volumes }}"
  changed_when: False

- name: Fail if any of the volumes are too small
  fail:
     msg: >
       Minimum free space required for {{ item.item.mount }}: {{ item.item.min_size }}G
       - current free space: {{ (item.stdout|int / const_bytes_in_gb|int) |round(1) }}G
  when: >
    item.stdout|int / const_bytes_in_gb|int < item.item.min_size|int
  with_items: "{{ volume_size.results }}"
  loop_control:
    label: "{{ item.item.mount }}"