#!/usr/bin/bash
#
#set -Eeuo pipefail
#
MQTT='mosquitto_pub -h mqtt.chaos -t switch_backup/switch'
BASEDIR="/backup"


#${MQTT}/debug -m "ARGS: \"$@\""

#check for an unmount event
if [[ "$@" == "CHECK-MOUNTS-AND-SHUTDOWN" ]]; then
	OPEN_FILES=$(lsof ${BASEDIR}/* |grep -c ${BASEDIR})
	[[ ${OPEN_FILES} -eq 0 ]] && umount ${BASEDIR}/*
	MOUNTS=$(grep -e ${BASEDIR} /proc/self/mounts | grep -v autofs -c)
	[[ ${MOUNTS} -gt 0 ]] &&  exit 0 #We still have mounts
	#No mounts left, shutdown disk
	vgchange -an backup >/dev/null
	sync
	sleep 5
	${MQTT}/switch_backup_power/command -m OFF
	exit 0
fi
#default case, echo mount string for autofs
${MQTT}/switch_backup_power/command -m ON
sleep 15 
vgchange -ay backup >/dev/null

echo "-fstype=btrfs,defaults,compress=lzo :/dev/backup/${1}"