To enable PE checkpoint/restart function, PE postinstall script shippted by xCAT should write the checkpoint key to rootimage and so ckpt.sh can read it after boot

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/branches/2.7@12524 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

xCAT-IBMhpc/share/xcat/IBMhpc/pe/ckpt.sh

@@ -26,3 +26,10 @@ for fs in ext3 ext4 nfs gpfs tmpfs; do
     fi
 done
 
+
+# Read checkpoint key from rootfs which generated by xCAT postinstall script
+if [ -f /root/.ckpt.key ]; then
+    cat /root/.ckpt.key > /sys/kernel/checkpoint/checksum_key
+else
+    echo 'ERROR:  no checkpoint key found' 
+fi