Periodic scrubbing of btrfs volumes.

#!/bin/sh

set -eu

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

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

            sort -u)

do

    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"

    echo "Started scrub on $mp." >&2

done

[Unit]

Description=Scrub btrfs volumes

ConditionACPower=true

After=local-fs.target

[Service]

Type=oneshot

ExecStart=btrfs-scrub

[Unit]

Description=Scrub btrfs volumes

[Timer]

OnCalendar=weekly

[Install]

WantedBy=multi-user.target

    enabled: true

    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: Copy btrfs scrub service and timer

  loop:

    - scrub.service

    - scrub.timer

  ansible.builtin.copy:

    dest: /etc/systemd/system

    mode: 0o0644

    src: '{{ item }}'

- name: Enable the btrfs scrub timer

  ansible.builtin.systemd:

    enabled: true

    name: scrub.timer

    state: started