alfred: Fix procd process handling for disable state

Alfred can be stopped during a (re)start or reload when:

* disabled = 1
* batman-adv interface is missing
* MAC based EUI64 IPv6 link-local address not set

It is assumed that procd detects that the procd instance definition
disappeared and the currently running instance must be stopped. But all
these checks were triggering an "exit" which then stopped the alfred init
script and the wrapper from /lib/functions/procd.sh. And thus procd was
never informed about the instances which should be changed.

The correct handling is to return the result of the function instead of
directly killing the init scripts.

Fixes: 45db0e60d2 ("alfred: use procd")
Signed-off-by: Sven Eckelmann <sven@narfation.org>

alfred/Makefile

@@ -4,7 +4,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=alfred
 PKG_VERSION:=2021.0
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://downloads.open-mesh.org/batman/releases/batman-adv-$(PKG_VERSION)

alfred/files/alfred.init

@@ -24,10 +24,12 @@ wait_for_dir() {
 			[ -d "$dir" ] && break
 			if [ $i = $timeout ] ; then
 				echo "$ifce not detected, alfred not starting."
-				exit 1
+				return 1
 			fi
 		done
 	fi
+
+	return 0
 }
 
 wait_for_ll_address() {
@@ -45,13 +47,13 @@ wait_for_ll_address() {
 			$1 ~ /^fe80/ && $5 ~ /^[012389ab]/ && $6 == "'"$iface"'" { RET=0 }
 			END { exit RET }
 		' /proc/net/if_inet6; then
-			return
+			return 0
 		fi
 		sleep 1
 	done
 
 	echo "$iface address not detected, alfred not starting."
-	exit 1
+	return 1
 }
 
 append_interface()
@@ -86,7 +88,7 @@ alfred_start() {
 	append args "-b $batmanif"
 
 	if [ "$batmanif" != "none" ]; then
-		wait_for_dir "$batmanif" "/sys/devices/virtual/net/$batmanif"
+		wait_for_dir "$batmanif" "/sys/devices/virtual/net/$batmanif" || return 1
 	fi
 
 	append alfred_args "$args"
@@ -107,7 +109,7 @@ start_service() {
 	config_load "alfred"
 	config_foreach alfred_start alfred
 
-	[ "$enable" = "0" ] && exit 0
+	[ "$enable" = "0" ] && return 0
 
 	procd_open_instance "alfred"
 	procd_set_param command /usr/sbin/alfred