Make the default start, stop and status functions overridable

This will make it possible to add support for supervision suites such as
runit and s6.

sh/openrc-run.sh.in

@@ -125,72 +125,6 @@ _status()
 	fi
 }
 
-# Template start / stop / status functions
-start()
-{
-	[ -n "$command" ] || return 0
-	local _background=
-	ebegin "Starting ${name:-$RC_SVCNAME}"
-	if yesno "${command_background}"; then
-		if [ -z "${pidfile}" ]; then
-			eend 1 "command_background option used but no pidfile specified"
-			return 1
-		fi
-		_background="--background --make-pidfile"
-	fi
-	if yesno "$start_inactive"; then
-		local _inactive=false
-		service_inactive && _inactive=true
-		mark_service_inactive
-	fi
-	eval start-stop-daemon --start \
-		--exec $command \
-		${chroot:+--chroot} $chroot \
-		${procname:+--name} $procname \
-		${pidfile:+--pidfile} $pidfile \
-		$_background $start_stop_daemon_args \
-		-- $command_args
-	if eend $? "Failed to start $RC_SVCNAME"; then
-		service_set_value "command" "${command}"
-		[ -n "${chroot}" ] && service_set_value "chroot" "${chroot}"
-		[ -n "${pidfile}" ] && service_set_value "pidfile" "${pidfile}"
-		[ -n "${procname}" ] && service_set_value "procname" "${procname}"
-		return 0
-	fi
-	if yesno "$start_inactive"; then
-		if ! $_inactive; then
-			mark_service_stopped
-		fi
-	fi
-	return 1
-}
-
-stop()
-{
-	local startcommand="$(service_get_value "command")"
-	local startchroot="$(service_get_value "chroot")"
-	local startpidfile="$(service_get_value "pidfile")"
-	local startprocname="$(service_get_value "procname")"
-	command="${startcommand:-$command}"
-	chroot="${startchroot:-$chroot}"
-	pidfile="${startpidfile:-$pidfile}"
-	procname="${startprocname:-$procname}"
-	[ -n "$command" -o -n "$procname" -o -n "$pidfile" ] || return 0
-	ebegin "Stopping ${name:-$RC_SVCNAME}"
-	start-stop-daemon --stop \
-		${retry:+--retry} $retry \
-		${command:+--exec} $command \
-		${procname:+--name} $procname \
-		${pidfile:+--pidfile} $chroot$pidfile \
-		${stopsig:+--signal} $stopsig
-	eend $? "Failed to stop $RC_SVCNAME"
-}
-
-status()
-{
-	_status
-}
-
 yesno $RC_DEBUG && set -x
 
 _conf_d=${RC_SERVICE%/*}/../conf.d
@@ -212,6 +146,15 @@ unset _conf_d
 # Load any system overrides
 sourcex -e "@SYSCONFDIR@/rc.conf"
 
+# load a service supervisor
+sourcex "@LIBEXECDIR@/sh/start-stop-daemon.sh"
+if [ -n "$rc_supervisor" ]; then
+	if ! sourcex -e "@LIBEXECDIR@/sh/${rc_supervisor}.sh"; then
+		ewarn "$rc_supervisor is an invalid value for rc_supervisor"
+		ewarn "Using the default."
+	fi
+fi
+
 # Set verbose mode
 if yesno "${rc_verbose:-$RC_VERBOSE}"; then
 	EINFO_VERBOSE=yes