#!/bin/sh

DAEMON="ifplugd"

# Each ifplugd instance handles only one interface, so this script is
# designed to be symlinked per interface. For each interface create a
# symlink with .IFACE appended to the name. E.g. to launch ifplugd for
# eth1 create a symlink from /etc/init.d/S41ifplugd.eth1 to this
# script. DEFAULT_IFACE sets the interface the non-symlink script will
# use, set it to empty in /etc/default/ifplugd to disable the default
# instance and use symlinked instances only.
DEFAULT_IFACE="eth0"
# If your action script is not in the default location
# /etc/ifplugd/ifplugd.action, use the "-r" option to set the
# location.
IFPLUGD_ARGS="-M"

# shellcheck source=/dev/null
[ -r "/etc/default/$DAEMON" ] && . "/etc/default/$DAEMON"

NAME_IFACE="$(basename "$0" | cut -s -d. -f2)"
if [ -n "$NAME_IFACE" ]; then
	IFACE="${NAME_IFACE}"
elif [ -n "$DEFAULT_IFACE" ]; then
	IFACE="${DEFAULT_IFACE}"
else
	# no interface configured
	exit 0
fi

# check-package disable Variables
PIDFILE="/var/run/${DAEMON}.${IFACE}.pid"
IFPLUGD_ARGS="${IFPLUGD_ARGS} -i ${IFACE}"

# BusyBox' ifplugd does not create a pidfile, so pass "-n" in the
# command line and use "--make-pidfile" to instruct start-stop-daemon
# to create one.
start() {
	printf 'Starting %s for %s: ' "$DAEMON" "$IFACE"
	# shellcheck disable=SC2086 # we need the word splitting
	start-stop-daemon --start --background --make-pidfile \
		--pidfile "$PIDFILE" --exec "/usr/sbin/$DAEMON" \
		-- -n $IFPLUGD_ARGS
	status=$?
	if [ "$status" -eq 0 ]; then
		echo "OK"
	else
		echo "FAIL"
	fi
	return "$status"
}

stop() {
	printf 'Stopping %s for %s: ' "$DAEMON" "$IFACE"
	start-stop-daemon --stop --pidfile "$PIDFILE" --exec "/usr/sbin/$DAEMON"
	status=$?
	if [ "$status" -eq 0 ]; then
		echo "OK"
	else
		echo "FAIL"
		return "$status"
	fi
	while start-stop-daemon --stop --test --quiet --pidfile "$PIDFILE" \
		--exec "/sbin/$DAEMON"; do
		sleep 0.1
	done
	rm -f "$PIDFILE"
	return "$status"
}

restart() {
	stop
	start
}

case "$1" in
	start|stop|restart)
		"$1";;
	reload)
		# Restart, since there is no true "reload" feature.
		restart;;
	*)
		echo "Usage: $0 {start|stop|restart|reload}"
		exit 1
esac