From 1b4380b8edfc66ee57f7d016308fd9d92eea8874 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Thu, 12 Jul 2007 21:59:38 +0000
Subject: [PATCH] avoid a race condition that might lead to dnsmasq reading an
 empty resolv.conf (#2007)

SVN-Revision: 7952
---
 package/base-files/files/usr/share/udhcpc/default.script | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/package/base-files/files/usr/share/udhcpc/default.script b/package/base-files/files/usr/share/udhcpc/default.script
index a3a696be70..7ce3d2aa89 100755
--- a/package/base-files/files/usr/share/udhcpc/default.script
+++ b/package/base-files/files/usr/share/udhcpc/default.script
@@ -47,12 +47,13 @@ case "$1" in
 		}
 		
 		[ -n "$dns" ] && {
-			echo -n > $RESOLV_CONF
-			${domain:+echo search $domain} >> $RESOLV_CONF
+			echo -n > "${RESOLV_CONF}.tmp"
+			${domain:+echo search $domain} >> "${RESOLV_CONF}.tmp"
 			for i in $dns ; do
 				echo "adding dns $i"
-				echo "nameserver $i" >> $RESOLV_CONF
+				echo "nameserver $i" >> "${RESOLV_CONF}.tmp"
 			done
+			mv "${RESOLV_CONF}.tmp" "$RESOLV_CONF"
 		}
 		
 		hotplug_event ifup
-- 
2.30.2