Fix misc/netbug script.

See the following debian bugs:
http://bugs.debian.org/289541
http://bugs.debian.org/313540
http://bugs.debian.org/313541
http://bugs.debian.org/313544
http://bugs.debian.org/347699

Changes from Debian iproute package rediffed to apply against current
iproute2 git tree.

--- iproute2/misc/netbug	2007-09-09 17:36:19.000000000 +0200
+++ iproute-20070313/misc/netbug	2007-09-09 20:42:01.000000000 +0200
@@ -1,23 +1,16 @@
 #! /bin/bash
 
+set -e
+
 echo -n "Send network configuration summary to [ENTER means kuznet@ms2.inr.ac.ru] "
 IFS="" read mail || exit 1
 [ -z "$mail" ] && mail=kuznet@ms2.inr.ac.ru
 
+netbug=`mktemp -d -t netbug.XXXXXX` || (echo "$0: Cannot create temporary directory" >&2; exit 1; )
+netbugtar=`tempfile -d $netbug --suffix=tar.gz` || (echo "$0: Cannot create temporary file" >&2; exit 1; )
+tmppath=$netbug
+trap "/bin/rm -rf $netbug $netbugtar" 0 1 2 3 13 15
 
-netbug=""
-while [ "$netbug" = "" ]; do
-	netbug=`echo netbug.$$.$RANDOM`
-	if [ -e /tmp/$netbug ]; then
-		netbug=""
-	fi
-done
-
-tmppath=/tmp/$netbug
-
-trap "rm -rf $tmppath $tmppath.tar.gz" 0 SIGINT
-
-mkdir $tmppath
 mkdir $tmppath/net
 
 cat /proc/slabinfo > $tmppath/slabinfo
@@ -44,9 +37,8 @@
 fi
 
 cd /tmp
-tar c $netbug | gzip -9c > $netbug.tar.gz
-
-uuencode $netbug.tar.gz $netbug.tar.gz | mail -s $netbug "$mail"
+tar c $tmppath | gzip -9c > $netbugtar
+uuencode $netbugtar $netbugtar | mail -s $netbug "$mail"
 
 echo "Sending to <$mail>; subject is $netbug"