diskimage-builder/diskimage_builder/elements/rax-nova-agent/source-repository-xen-tools

xen-tools file /tmp/xs-tools.iso https://f97f271e9fde8f434e2a-fa73b8821af96cee574a861a54d04230.ssl.cf3.rackcdn.com/files/xentools/xs-tools-6.2.0.iso