Clear GPT and MBR data structures on disk before imaging

stendulker · stendulker · commit 8f5ed3e2f16c · 2016-02-09T09:13:07.000-08:00
This patch clears all GPT and MBR data structures on the disk.
GPT maintains its data structures at start and at end of the
disk.

Change-Id: I8d0b367755b568cb44f02f62b873659b4bea0f14
Closes-Bug: #1543339
diff --git a/ironic_python_agent/shell/write_image.sh b/ironic_python_agent/shell/write_image.sh
@@ -35,8 +35,8 @@ DEVICE="$2"
 
 # In production this will be replaced with secure erasing the drives
 # For now we need to ensure there aren't any old (GPT) partitions on the drive
-log "Erasing existing mbr from ${DEVICE}"
-dd if=/dev/zero of=$DEVICE bs=512 count=10
+log "Erasing existing GPT and MBR data structures from ${DEVICE}"
+sgdisk -Z $DEVICE
 
 log "Imaging $IMAGEFILE to $DEVICE"
 qemu-img convert -t directsync -O host_device $IMAGEFILE $DEVICE
