create-backup-drive.yaml

- name: Create backup drive
  hosts: myhosts
  vars:
    zfs_pool: backup
    zfs_dataset: default
    zfs_mount_point: /backup
  tasks:
  - name: Confirm high-risk operation
    pause:
      prompt: Are you SURE you want to format the backup drive? Enter "this will destroy my data" if so
    register: confirm_drive_format
  - name: Check for confirmation
    fail:
      msg: Process aborted.
  - name: Install zfsutils-linux package
    apt:
      name: zfsutils-linux
    when: confirm_drive_format.user_input != "this will destroy my data"
  - name: Delete any extant pool
    command: zpool destroy {{ zfs_pool }}
    ignore_errors: true
  - name: Format drive
    command: echo -e "g\nw\n" | /sbin/fdisk /dev/disk/by-id/{{ backup_drive_id }}
  - file:
      path: "{{ zfs_mount_point }}"
      state: absent
  - name: Create pool
    command: zpool create -m none -o ashift=14 -O atime=off -O compression=lz4 -O dedup=on -O canmount=off {{ zfs_pool }} /dev/disk/by-id/{{ backup_drive_id }}
  - name: Create dataset
    command: zfs create -o mountpoint={{ zfs_mount_point }} {{ zfs_pool }}/{{ zfs_dataset }}
  - name: Change backup mount owner
    file:
      path: "{{ zfs_mount_point }}"
      owner: danielrothfus
      group: danielrothfus
      recurse: true
  - name: Create backup subdirectories
    become: yes
    become_user: danielrothfus
    file:
      path: "/{{ zfs_mount_point }}/{{ item }}"
      state: directory
    with_items:
      - Archive
      - Computer
      - ComputerPhone
  # The autobackup:main property tells zfs-autobackup (1) to backup that dataset (not the root dataset) and (2) to name that backup group "main".
  - name: Annotate backup dataset
    command: zfs set autobackup:main=true {{ zfs_pool }}/{{ zfs_dataset }}