From 413d20267af41c2500337bcf82ce125c7cfcdd8b Mon Sep 17 00:00:00 2001
From: Weezer Su <weezer.su@gmail.com>
Date: Fri, 27 Jan 2017 15:26:25 -0600
Subject: [PATCH] Add the md5 check on image

Add the md5 image hash check, if the image exists, check the md5
hash, if the hash is not the same, remove the old image and download
new one.

Change-Id: I2232129a814e89aaac9bf54ee16ede983fff5b48
---
 multi-node-aio/setup-cobbler.sh | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/multi-node-aio/setup-cobbler.sh b/multi-node-aio/setup-cobbler.sh
index 429c99bf..e60d5af6 100755
--- a/multi-node-aio/setup-cobbler.sh
+++ b/multi-node-aio/setup-cobbler.sh
@@ -94,13 +94,22 @@ update-rc.d cobblerd defaults
 # Update Cobbler Signatures
 cobbler signature update
 
-# Get ubuntu server image
+# Get ubuntu server image md5 hash file
+wget -O /tmp/MD5SUM5 /tmp/MD5SUM5 http://releases.ubuntu.com/"${DEFAULT_IMAGE:0:5}"/MD5SUMS
+
+# Get ubuntu server image, if the server image exists, compare the md5, rm and download new image if the hash is not
+# the same.
 mkdir_check "/var/cache/iso"
 pushd /var/cache/iso
   if [ -f "/var/cache/iso/ubuntu-"${DEFAULT_IMAGE}"-server-amd64.iso" ]; then
-    rm /var/cache/iso/ubuntu-"${DEFAULT_IMAGE}"-server-amd64.iso
+    md5=`md5sum ubuntu-"${DEFAULT_IMAGE}"-server-amd64.iso | awk '{ print $1 }'`
+    if ! grep ${md5} /tmp/MD5SUMS &>/dev/null ; then
+      rm /var/cache/iso/ubuntu-"${DEFAULT_IMAGE}"-server-amd64.iso
+      wget http://releases.ubuntu.com/"${DEFAULT_IMAGE:0:5}"/ubuntu-"${DEFAULT_IMAGE}"-server-amd64.iso
+    fi
+  else
+    wget http://releases.ubuntu.com/"${DEFAULT_IMAGE:0:5}"/ubuntu-"${DEFAULT_IMAGE}"-server-amd64.iso
   fi
-  wget http://releases.ubuntu.com/"${DEFAULT_IMAGE:0:5}"/ubuntu-"${DEFAULT_IMAGE}"-server-amd64.iso
 popd
 
 # import cobbler image