#!/bin/sh
set -e

swapfile="/mnt/data/swapfile"
swapsize="$(awk '/MemTotal/{ print $2 * 0.33 }' /proc/meminfo)"


if [ ! -s "${swapfile}" ] || [ "$(stat "${swapfile}" -c '%s')" -lt $((swapsize * 1024)) ]; then
	# Check free space (in 4k blocks)
	if [ "$(stat -f /mnt/data -c '%f')" -lt $((swapsize / 4)) ]; then
		echo "[WARNING] Not enough space to allocate swapfile"
		exit 1
	fi

	dd if=/dev/zero of="${swapfile}" bs=1k count="${swapsize}"
fi

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