6in4: fix update timeout

The recent rework of the 6in4 endpoint update broke the retry mechanism.
Rework the timeout handling and make the update status more verbose.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

SVN-Revision: 44327

package/network/ipv6/6in4/Makefile

@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=6in4
-PKG_VERSION:=19
+PKG_VERSION:=20
 PKG_RELEASE:=1
 PKG_LICENSE:=GPL-2.0
 

package/network/ipv6/6in4/files/6in4.sh

@@ -9,6 +9,19 @@
 	init_proto "$@"
 }
 
+proto_6in4_update() {
+	sh -c '
+		local timeout=5
+
+		(while [ $((timeout--)) -gt 0 ]; do
+			sleep 1
+			kill -0 $$ || exit 0
+		done; kill -9 $$) 2>/dev/null &
+
+		exec "$@"
+	' "$1" "$@"
+}
+
 proto_6in4_setup() {
 	local cfg="$1"
 	local iface="$2"
@@ -97,13 +110,20 @@ proto_6in4_setup() {
 		local try=0
 		local max=3
 
-		while [ $((++try)) -le $max ]; do
-			( exec $urlget $urlget_opts "$url" | logger -t "$link" ) &
-			local pid=$!
-			( sleep 20; kill $pid 2>/dev/null ) &
-			wait $pid && break
-			sleep 20;
-		done
+		(
+			set -o pipefail
+			while [ $((++try)) -le $max ]; do
+				if proto_6in4_update $urlget $urlget_opts "$url" 2>&1 | \
+					sed -e 's,^Killed$,timeout,' -e "s,^,update $try/$max: ," | \
+					logger -t "$link";
+				then
+					logger -t "$link" "updated"
+					return 0
+				fi
+				sleep 5
+			done
+			logger -t "$link" "update failed"
+		)
 	}
 }