archlinux-ansible/roles/disk/egb/postpartitioning/tasks/main.yml

---
- name: Generate fstab.
  include_role:
    name: genfstab
  vars:
    chroot: "{{ root_mount }}"

- name: Check if btrfs-progs is installed.
  command: arch-chroot {{ root_mount }}
    pacman -Qk btrfs-progs
  register: result
  failed_when: false
  changed_when: false

- name: Install btrfs-progs.
  command: arch-chroot {{ root_mount }}
    pacman -Sy btrfs-progs --noconfirm
  when: result.rc != 0

- name: Configure mkinitcpio.
  mkinitcpio:
    state: present
    path: "{{ root_mount }}/etc/mkinitcpio.conf"
    binaries: /usr/bin/btrfs
    hooks:
      - btrfs

- name: Run mkinitcpio.
  command: arch-chroot {{ root_mount }} mkinitcpio -P
  changed_when: true