#!/bin/bash

set -euo pipefail

run-parts --exit-on-error -- /etc/zfs-snapshot-backup-pre.d


% for dataset in sorted(node.metadata.get('zfs/filesystems_with_backup_snapshots')):
mountpoint="/mnt/backup-snapshot${node.metadata['zfs']['datasets'][dataset]['mountpoint']}"

if findmnt "$mountpoint" >/dev/null
then
    umount "$mountpoint"
fi

if zfs get type "${dataset}@snapshot-backup" >/dev/null 2>&1
then
    zfs destroy "${dataset}@snapshot-backup"
fi

zfs snapshot "${dataset}@snapshot-backup"

mkdir -p "$mountpoint"
mount -t zfs "${dataset}@snapshot-backup" "$mountpoint"


% endfor
run-parts --exit-on-error -- /etc/zfs-snapshot-backup-post.d