nut: Fix upsmon init actions

1) For upsmon start and stop were at wrong position in rc.d
2) Stop needs more than just killing the procd instead but rather
needs a  stop command to be issued.
3) Interface up/down was causing not to enter a crashloop (we fix this
with procd trigger on interface changes).

Signed-off-by: Daniel F. Dickinson <cshored@thecshore.com>

net/nut/files/nut-monitor.init

@@ -1,6 +1,7 @@
 #!/bin/sh /etc/rc.common
 
-START=51
+START=82
+STOP=28
 USE_PROCD=1
 UPSMON_C=/var/etc/nut/upsmon.conf
 
@@ -162,6 +163,32 @@ build_config() {
 	[ -s "$UPSMON_C" ] && chgrp $(id -gn ${runas:-root}) "$UPSMON_C"
 }
 
+interface_triggers() {
+	local action="$1"
+	local triggerlist trigger
+
+	config_get triggerlist "upsmon" triggerlist
+
+	. "${IPKG_INSTROOT}"/lib/functions/network.sh
+
+	if [ -n "$triggerlist" ]; then
+		for trigger in $triggerlist; do
+			if [ "$action" = "add_trigger" ]; then
+				procd_add_interface_trigger "interface.*" "$trigger" /etc/init.d/nut-monitor restart
+			else
+				network_is_up "$trigger" && return 0
+			fi
+		done
+	else
+		if [ "$action" = "add_trigger" ]; then
+			procd_add_raw_trigger "interface.*.up" 2000 /etc/init.d/nut-monitor restart
+		else
+			ubus call network.device status | grep -q '"up": true' && return 0
+		fi
+	fi
+	[ "$action" = "add_trigger" ] || return 1
+}
+
 start_service() {
 	local runas
 	local havemon havems
@@ -169,11 +196,12 @@ start_service() {
 
 	[ "$havemon" != 1 ] && return
 	[ "$havems" != 1 ] && return
+	interface_triggers "check_interface_up" || return 0
 
 	procd_open_instance "upsmon"
-	procd_set_param respawn
+	procd_set_param respawn 10 20 6
-	procd_set_param stderr 0
+	procd_set_param stderr 1
-	procd_set_param stdout 1
+	procd_set_param stdout 0
 	procd_set_param command /usr/sbin/upsmon -D
 	procd_close_instance
 }
@@ -184,12 +212,16 @@ reload_service() {
 		build_config
 		/usr/sbin/upsmon -c reload
 	else
-		stop
+		restart
-		sleep 2
-		start_service
 	fi
 }
 
+stop_service() {
+	upsmon -c stop
+}
+
 service_triggers() {
+	config_load nut_monitor
+	interface_triggers "add_trigger"
 	procd_add_reload_trigger "nut_monitor"
 }