fails when libvirt guest exists

[Magne Rasmussen]

vmbuilder fails when using libvirt and a guest with the same name already exists.

2010-03-22 11:08:52,797 DEBUG : Calling preflight_check method in VMBuilder.plugins.libvirt plugin.
Traceback (most recent call last):
  File "/home/magne/vmbuilder/vmbuilder", line 24, in <module>
    cli.main()
  File "/home/magne/vmbuilder/VMBuilder/contrib/cli.py", line 112, in main
    hypervisor.install_os()
  File "/home/magne/vmbuilder/VMBuilder/hypervisor.py", line 49, in install_os
    self.call_hooks('preflight_check')
  File "/home/magne/vmbuilder/VMBuilder/distro.py", line 66, in call_hooks
    call_hooks(self, *args, **kwargs)
  File "/home/magne/vmbuilder/VMBuilder/util.py", line 158, in call_hooks
    getattr(plugin, func, log_no_such_method)(*args, **kwargs)
  File "/home/magne/vmbuilder/VMBuilder/plugins/libvirt/__init__.py", line 54, in preflight_check
    if hostname in self.all_domains() and not self.vm.overwrite:
AttributeError: 'Libvirt' object has no attribute 'vm'

I'm using revision 426 of branch http://bazaar.launchpad.net/~ubuntu-virt/vmbuilder/0.12

[Loïc Minier (lool)]

I get this too with lucid final; creating a vm in the current dir with --libvirt=qemu:///system and then repeating that after wiping it with rm -rf causes the above exception.