#!/bin/sh

prog=$0
usage() {
	echo "usage: rc-update [--quiet] add|del|delete SVC RUNLEVEL"
	exit $1
}

msg() {
	if ! [ -n "$quiet" ]; then
		echo "$@"
	fi
}

OPTS=$(getopt -l quiet,help -o "qh" -n $prog -- "$@") || usage "1" >&2

quiet=
eval set -- "$OPTS"
for opt; do
	case "$opt" in
		-h|--help)
			usage 0
			;;
		--quiet)
			quiet=1
			;;
		--)
			shift
			break
			;;
		*) usage "1" >&2
			;;
	esac
	shift
done

cmd="$1"
svc="$2"
runlevel="${3:-default}"

if [ -z "$cmd" ] || [ -z "$svc" ]; then
	usage "1" >&2
fi

case "$cmd" in
	add)
		if [ -L "$ROOT"/etc/runlevels/$runlevel/$svc ]; then
			msg " * rc-update: $svc already installed in runlevel \`$runlevel'; skipping"
			exit 0
		fi
		mkdir -p "$ROOT"/etc/runlevels/$runlevel
		ln -sf ../../init.d/$svc "$ROOT"/etc/runlevels/$runlevel/$svc
		msg " * service $svc added to runlevel $runlevel"
		;;
	del|delete)
		if ! [ -L "$ROOT"/etc/runlevels/$runlevel/$svc ]; then
			msg " * rc-update: service \`$svc' is not in the runlevel \`$runlevel'" >&2
			exit 1
		fi
		rm "$ROOT"/etc/runlevels/$runlevel/$svc
		msg " * service foo removed from runlevel $runlevel"
		;;
	*) usage "1" >&2
		;;
esac