Per btrfs device scrub job.

#!/bin/sh

set -eu

for mp in $(lsblk --list --noheadings --output fstype,mountpoint | \

            awk '$1 == "btrfs" {print $2}' | \

            sort -u)

do

    # In case there are no btrfs volumes, the for loop will execute once with an

    # empty string for mp. Validate that indeed we're passed a mountpoint.

    [ -d "$mp" ] || continue

    status="$(btrfs scrub status "$mp" | awk '$1 == "Status:" {print $2}')"

    if [ "$status" = 'running' ]

    then

        echo "Scrub already running on $mp, skipping." >&2

        continue

    fi

    btrfs scrub start "$mp" >&2

done

    name: update.timer

    state: started

- name: Copy the btrfs scrub script

  ansible.builtin.copy:

    dest: /usr/local/sbin/btrfs-scrub

    mode: 0o0755

    src: btrfs-scrub

- name: Create btrfs scrub services

  # yamllint disable rule:line-length

  loop: &btrfs_devices |-

    {{ ansible_mounts|selectattr("fstype", "equalto", "btrfs")|map(attribute="device")|unique }}

  # yamllint enable rule:line-length

  ansible.builtin.template:

    dest: /etc/systemd/system/scrub{{ name }}.service

    mode: 0o0644

    src: scrub.service.j2

  vars: &btrfs_vars

    device: '{{ item }}'

    name: '{{ item|replace("/", "_") }}'

  tags: [scrub]

- name: Copy btrfs scrub service and timer

  loop:

    - scrub.service

    - scrub.timer

  ansible.builtin.copy:

    dest: /etc/systemd/system

- name: Create btrfs scrub timers

  loop: *btrfs_devices

  ansible.builtin.template:

    dest: /etc/systemd/system/scrub{{ name }}.timer

    mode: 0o0644

    src: '{{ item }}'

    src: scrub.timer.j2

  vars: *btrfs_vars

  tags: [scrub]

- name: Enable the btrfs scrub timer

- name: Enable the btrfs scrub timers

  loop: *btrfs_devices

  ansible.builtin.systemd:

    enabled: true

    name: scrub.timer

    name: scrub{{ name }}.timer

    state: started

  vars: *btrfs_vars

  tags: [scrub]

# vim: filetype=systemd

[Unit]

Description=Scrub btrfs volumes

Description=Scrub btrfs device {{ device }}

ConditionACPower=true

After=local-fs.target

[Service]

Type=oneshot

ExecStart=btrfs-scrub

Type=exec

ExecStart=btrfs scrub start -B {{ device }}

# vim: filetype=systemd

[Unit]

Description=Scrub btrfs volumes

Description=Scrub btrfs device {{ device }}

[Timer]

OnCalendar=weekly