Implement VM configuration and deploy the images.

roles/lmn_vm/files/rebase-vm.sh

@@ -0,0 +1,44 @@
+#!/usr/bin/bash
+
+# Rebase one level down
+
+set -eu
+
+# if less than one arguments supplied, display usage
+if [  $# -ne 1 ]
+then
+    echo "This script takes as input the name of the VM to rebase one level down"
+    echo "Usage: $0 vm_name"
+    exit 1
+fi
+
+VM_NAME=$1
+
+if [ ! -f $VM_NAME.qcow2 ]
+then
+    echo "File not found $VM_NAME.qcow2"
+    exit 1
+fi
+
+shopt -s lastpipe
+qemu-img info --backing-chain $VM_NAME.qcow2 | grep image | wc -l | read NUMBASES
+qemu-img info --backing-chain $VM_NAME.qcow2 | grep image | head  -n 3 | tail -n 1 | cut -d' ' -f2 | read NEWBASE
+qemu-img info --backing-chain $VM_NAME.qcow2 | grep image | head  -n 2 | tail -n 1 | cut -d' ' -f2 | read CURRENTBASE
+
+if [ ! $NUMBASES -ge 3 ]
+then
+    echo "Image must have at least 2 backing-files"
+    exit 1
+fi
+
+if [ ! -f $NEWBASE -a -f $CURRENTBASE ]
+then
+    echo "Backingfiles not found $CURRENTBASE, $NEWBASE"
+    exit 1
+fi
+
+qemu-img rebase -f qcow2 -b $NEWBASE -F qcow2 $VM_NAME.qcow2
+rm $CURRENTBASE
+mv $VM_NAME.qcow2 $CURRENTBASE
+chmod a-w $CURRENTBASE
+qemu-img create -f qcow2 -F qcow2 -b $CURRENTBASE $VM_NAME.qcow2