#!/bin/bash
set -euo pipefail


BASEDIR="$(dirname ${0} | sed "s|^.|${PWD}|")"
source "${BASEDIR}/backup.conf"
TIMESTAMP="$(date +%Y_%m_%d-%H_%M_%S)"
SNAPSHOT="${SOURCE}@${TIMESTAMP}"


sudo zfs snapshot ${SNAPSHOT}

if [[ -f "${BASEDIR}/backup-last" ]]; then
	BACKUP_LAST="$(cat ${BASEDIR}/backup-last)"

	sudo \
		zfs \
			send \
			-i ${BACKUP_LAST} \
			${SNAPSHOT} \
	| \
	sudo \
		zfs \
			receive \
			${DEST}
else
	sudo \
		zfs \
			send \
			${SNAPSHOT} \
	| \
	sudo \
		zfs \
			receive \
			${DEST}
fi

printf "@${TIMESTAMP}" | tee "${BASEDIR}/backup-last" &> /dev/null