#!/bin/sh
set -e

swapfile="/mnt/data/swapfile"
# Swap space in 4k blocks
swapsize="$(awk '/MemTotal/{ print int($2 * 0.33 / 4) }' /proc/meminfo)"


if [ ! -s "${swapfile}" ] || [ "$(stat "${swapfile}" -c '%s')" -lt $((swapsize * 4096)) ]; then
	# Check free space (in 4k blocks)
	if [ "$(stat -f /mnt/data -c '%f')" -lt "${swapsize}" ]; then
		echo "[WARNING] Not enough space to allocate swapfile"
		exit 1
	fi

	echo "[INFO] Creating swapfile of size $((swapsize *4))k"
	dd if=/dev/zero of="${swapfile}" bs=4k count="${swapsize}"
fi

if ! swaplabel "${swapfile}" > /dev/null 2>&1; then
	/usr/lib/systemd/systemd-makefs swap "${swapfile}"
fi