#!/bin/sh

DAEMON=swap
CONF_NAME=mod
. /etc/init.d/modlibrc

has_swap() {
	sed '1d' /proc/swaps | grep -v /dev/ramzswap0 | grep -q ''
}

start() {
	echo -n "Starting $DAEMON ... "

	if has_swap; then
		echo 'already running.'
		exit 1
	fi

	swapon "$MOD_SWAP_FILE" 2>/dev/null
	exitval=$?

	if [ "$exitval" -eq 0 ]; then
		echo $MOD_SWAP_SWAPPINESS >/proc/sys/vm/swappiness
		echo 'done.'
	else
		echo 'failed.'
		exit $exitval
	fi
}

stop() {
	echo -n "Stopping $DAEMON ... "

	if ! has_swap; then
		echo 'not running.'
		exit 1
	fi

	sed '1d' /proc/swaps | grep -v /dev/ramzswap0 | while read swap _; do
		swapoff $swap
	done

	if has_swap; then
		echo 'failed.'
		exit 1
	else
		echo 'done.'
	fi
}

autohelper() {
	if [ $# -ne 2 ]; then
		echo "Usage: $0 [autostart|autostop] [file or partition]" 1>&2
		return 1
	fi
	echo "$MOD_SWAP_FILE" | grep -q $2 || exit 2 # not the defined swap-partition, abort
	[ "$MOD_SWAP" != yes ] && exit 3 # auto-mode is disabled, abort
	$1 >> /var/log/mod_swap.log
}

case $1 in
	""|load)
		modreg daemon -p mod swap
		if [ "$MOD_SWAP" != yes ]; then
			echo "$DAEMON is disabled." 1>&2
			exit 1
		fi
		echo "$DAEMON is enabled." 1>&2
		;;
	unload)
		stop
		modunreg daemon mod swap
		;;
	start)
		start
		;;
	stop)
		stop
		;;
	restart)
		stop
		sleep 1
		start
		;;
	autostart)
		autohelper start $2
		;;
	autostop)
		autohelper stop $2
		;;
	status)
		if has_swap; then
			echo 'running'
		else
			echo 'stopped'
		fi
		;;
	*)
		echo "Usage: $0 [load|unload|start|stop|restart|autostart|autostop|status]" 1>&2
		exit 1
		;;
esac

exit 0