udhcpc/default.script: recognize $search dhcp parameter too, in addition to...

udhcpc/default.script: recognize $search dhcp parameter too, in addition to $domain (and simplify these parts a bit)

debian/tree/busybox-udeb/etc/udhcpc/default.script

@@ -8,17 +8,14 @@ comma_separate() {
 }
 
 do_resolv_conf() {
-	local cfg=/etc/resolv.conf
-
-	if [ -n "$domain" ] || [ -n "$dns" ]; then
-		echo -n > $cfg
-		if [ -n "$domain" ]; then
-			echo search $domain >> $cfg
-		fi
-
+	if [ -n "$domain$search$dns" ]; then
+	    {
+		[ ! "$domain" ] || echo domain $domain
+		[ ! "$search" ] || echo search $search
 		for i in $dns ; do
-			echo nameserver $i >> $cfg
+			echo nameserver $i
 		done
+	    } > /etc/resolv.conf
 	fi
 }
 

debian/tree/udhcpc/etc/udhcpc/default.script

@@ -37,12 +37,13 @@ case $1 in
 	fi
 
 	# Update resolver configuration file
-	[ -n "$domain" ] && R="domain $domain" || R=""
-	for i in $dns; do
-	    R="$R
-nameserver $i"
-	done
-
+	R="$(
+	    [ ! "$domain" ] || echo domain $domain
+	    [ ! "$search" ] || echo search $search
+	    for i in $dns; do
+		echo nameserver $i
+	    done
+	)"
 	if [ -x /sbin/resolvconf ]; then
 	    echo "$R" | resolvconf -a "$interface.udhcpc"
 	else