bootdisk = None

for disk_attachment in disk_attachments:

    disk = connection.follow_link(disk_attachment.disk)

    if disk_attachment.bootable == True:

        bootdisk = connection.follow_link(disk_attachment.disk)

        break

What if I would like to emit an event if for any reason the creation of the snapshot doesn't complete in a predefined elapsed time and manage it?

I think I have also to manage the case when for any reason no disk is marked as bootable inside the VM I'm backing up...

Gianluca