#!/bin/sh

DAEMON=/usr/bin/tera-hwd
PIDFILE=/run/tera-hwd/tera-hwd.pid
ENVFILE=/etc/tera/tera-hwd.env
RUN_AS=root:tera

ensure_group() {
	if ! grep -q '^tera:' /etc/group; then
		addgroup -S tera || return 1
	fi
}

prepare_runtime() {
	ensure_group || return 1
	mkdir -p /run/tera-hwd || return 1
	chown root:tera /run/tera-hwd || return 1
	chmod 0750 /run/tera-hwd || return 1
}

load_environment() {
	if [ -r "$ENVFILE" ]; then
		set -a
		. "$ENVFILE"
		set +a
	fi
}

is_running() {
	[ -r "$PIDFILE" ] || return 1
	pid="$(cat "$PIDFILE" 2>/dev/null)"
	[ -n "$pid" ] && kill -0 "$pid" 2>/dev/null
}

start_service() {
	if is_running; then
		echo "tera-hwd is already running"
		return 0
	fi
	rm -f "$PIDFILE"
	[ -x "$DAEMON" ] || { echo "missing $DAEMON" >&2; return 1; }
	prepare_runtime || return 1
	load_environment
	umask 0007
	start-stop-daemon -S -q -b -m -p "$PIDFILE" -c "$RUN_AS" -x "$DAEMON"
}

stop_service() {
	if ! is_running; then
		rm -f "$PIDFILE"
		return 0
	fi
	start-stop-daemon -K -q -p "$PIDFILE" -x "$DAEMON"
	rm -f "$PIDFILE"
}

case "$1" in
	start) start_service ;;
	stop) stop_service ;;
	restart) stop_service && start_service ;;
	status) is_running ;;
	*) echo "Usage: $0 {start|stop|restart|status}" >&2; exit 1 ;;
esac