From 25c046abb3898aca38ea7ec8890942eb1516988b Mon Sep 17 00:00:00 2001
From: Petter Reinholdtsen <pere@hungry.com>
Date: Wed, 5 Dec 2012 19:41:52 +0100
Subject: Download new ISO only when it is changed at the source.

---
 bin/cd_tester.sh | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/bin/cd_tester.sh b/bin/cd_tester.sh
index 52f41f32..fc1ab1bc 100755
--- a/bin/cd_tester.sh
+++ b/bin/cd_tester.sh
@@ -170,10 +170,14 @@ trap cleanup_all INT TERM EXIT
 # if there is a CD image...
 #
 if [ ! -z $IMAGE ] ; then
-	# only download if $IMAGE is older than a week (60*24*7=10080) (+9500 is a bit less than a week)
-	if test $(find $IMAGE -mmin +9500) || ! test -f $IMAGE ; then
-		curl $URL > $IMAGE
+
+	# Only download if newer image is avaiable
+	CURLOPTS=""
+	if [ -f $IMAGE ] ; then
+	    CURLOPTS="-z $IMAGE"
 	fi
+	curl $CURLOPTS -o $IMAGE $URL
+
 	sudo mkdir -p $IMAGE_MNT
 	mount | grep -v grep | grep $IMAGE_MNT && sudo umount -l $IMAGE_MNT
 	sleep 1
-- 
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