---
- name: Check btrfs installation
  ansible.builtin.shell: |
    command -v btrfs
  become: true # btrfs is located in /usr/sbin, which means root permission is needed.
  changed_when: false
  failed_when: false
  register: "is_btrfs_installed"
  ignore_errors: true

- name: Install btrfs
  ansible.builtin.apt:
    name: "btrfs-progs"
    state: "present"
  become: true
  when: is_btrfs_installed.rc != 0

- name: Set hard disk path
  ansible.builtin.shell: |
    set -o pipefail
    ls -1 /dev/disk/by-id/ata-* | \
    grep -F -e "{{ hardware['hdd']['data'].values() | join('" -e "') }}" | \
    grep -vE -- '-part[0-9]+$' | \
    sort
  changed_when: false
  register: "hdd_path_list"

- name: Check vmm_hdd filesystem already exists
  ansible.builtin.command: |
    blkid -L {{ hardware['btrfs']['label'] }}
  register: is_vmm_data
  changed_when: false
  failed_when: false
  become: true

- name: Check disk number
  ansible.builtin.fail:
    msg: "Below 4 disks for RAID10, found {{ hdd_path_list.stdout_lines | length }}"
  when: (hdd_path_list.stdout_lines | length) < 4

- name: Set btrfs raid10 volume
  ansible.builtin.shell: |
    mkfs.btrfs -f \
    -L {{ hardware['btrfs']['label'] }} \
    -d {{ hardware['btrfs']['level'] }} \
    -m {{ hardware['btrfs']['level'] }} \
    {{ hdd_path_list.stdout_lines | join(' ') }}
  become: true
  when:
    - is_vmm_data.rc != 0
    - (hdd_path_list.stdout_lines | length) >= 4
  changed_when: is_mkfs.rc == 0
  register: "is_mkfs"

- name: Create mount volume
  ansible.builtin.file:
    path: "{{ hardware['btrfs']['mount_point'] }}"
    state: "directory"
    owner: "root"
    group: "root"
    mode: "0711"
  become: true

- name: Mount btrfs raid10 volume
  ansible.posix.mount:
    path: "{{ hardware['btrfs']['mount_point'] }}"
    src: "LABEL={{ hardware['btrfs']['label'] }}"
    state: "mounted"
    fstype: "btrfs"
    opts: "defaults,noatime,nodatacow,degraded,nofail"
  become: true

- name: Set mounted btrfs volume permissions
  ansible.builtin.file:
    path: "{{ hardware['btrfs']['mount_point'] }}"
    state: "directory"
    owner: "root"
    group: "root"
    mode: "0711"
  become: true

- name: Deploy btrfs scrub service and timer
  ansible.builtin.template:
    src: "{{ hostvars['console']['node']['config_path'] }}/services/systemd/vmm/btrfs/{{ item }}.j2"
    dest: "/etc/systemd/system/{{ item }}"
    owner: "root"
    group: "root"
    mode: "0644"
  loop:
    - "btrfs-scrub.service"
    - "btrfs-scrub.timer"
  become: true

- name: Enable auto btrfs scrub
  ansible.builtin.systemd:
    name: "btrfs-scrub.timer"
    state: "started"
    enabled: true
    daemon_reload: true
  become: true