#!/usr/bin/env bash
#
# Script to create stage4's fstab entry for swap devices
#
# Will use swap partitions of MBR's type '82' or
# GPT UUID '0657fd6d-a4ab-43c4-84e5-0933c84b4f4f'
#
. /etc/openslx

for swap_dev in \
	$(slx-tools dev_find_partitions "82" "0657fd6d-a4ab-43c4-84e5-0933c84b4f4f"); do

	[ -z "$swap_dev" ] && continue

	# Generate swap fstab entry for NEWROOT. Use priority 10 to prefer zram
	echo -e "$swap_dev\tswap\t\tswap\t\tx-systemd.makefs,pri=10\t0\t0" \
		>> "$NEWROOT/etc/fstab"
	
	# check if configured not to wipe any existing filesystem
	[ "$SLX_WIPE_SWAP_DEVICE" = "yes" ] || continue

	# create a drop-in to wipe the device's filesystem
	swap_dev_systemd_escaped="$(tr '/' '-' <<< ${swap_dev:1})"
	base_dir="$NEWROOT/etc/systemd/system"
	dropin_dir="$base_dir/systemd-mkswap@${swap_dev_systemd_escaped}.service.d"
	mkdir -p "$dropin_dir"
	cat <<- EOF > "$dropin_dir/wipefs.conf"
		[Service]
		ExecStartPre=/sbin/wipefs -a %f
	EOF
done

true