# copy commit message from OE as the patch comment:
#    commit ec4da6df3ad5b8b03446d0dda9c50a2439ae325a
#    Author: Denys Dmytriyenko <denis@denix.org>
#    Date:   Wed Feb 4 11:43:18 2009 -0500
#
#    busybox: fix nfsroot issues with resetting IP and deleting routes
#
# above comment added by Kevin Tian <kevin.tian@intel.com>, 2010-07-06
Index: busybox-1.15.3/examples/udhcp/simple.script
===================================================================
--- busybox-1.15.3.orig/examples/udhcp/simple.script	2010-06-27 12:17:14.116876946 +0200
+++ busybox-1.15.3/examples/udhcp/simple.script	2010-06-27 12:18:38.607868533 +0200
@@ -10,10 +10,17 @@
 BROADCAST="broadcast +"
 [ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
 
+# return 0 if root is mounted on a network filesystem
+root_is_nfs() {
+	grep -qe '^/dev/root.*\(nfs\|smbfs\|ncp\|coda\) .*' /proc/mounts
+}
+
 case "$1" in
 	deconfig)
+		if ! root_is_nfs ; then
 		echo "Setting IP address 0.0.0.0 on $interface"
-		ifconfig $interface 0.0.0.0
+			ifconfig $interface 0.0.0.0
+		fi
 		;;
 
 	renew|bound)
@@ -21,15 +28,17 @@
 		ifconfig $interface $ip $NETMASK $BROADCAST
 
 		if [ -n "$router" ] ; then
-			echo "Deleting routers"
-			while route del default gw 0.0.0.0 dev $interface 2>/dev/null ; do
-				:
-			done
+			if ! root_is_nfs ; then
+				echo "Deleting routers"
+				while route del default gw 0.0.0.0 dev $interface 2>/dev/null ; do
+					:
+				done
+			fi
 
 			metric=0
 			for i in $router ; do
 				echo "Adding router $i"
-				route add default gw $i dev $interface metric $((metric++))
+				route add default gw $i dev $interface metric $((metric++)) 2>/dev/null
 			done
 		fi
 
