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Hi Mark,

thanks for the exhaustive reply! I was asking because I believe that nova-manage shouldn't be loading the entire libvirt module, just for retrieving a simply flag. In principle, the tool should be agnostic to underlying implementation details (e.g. hypervisors, networking etc), but I can see why you need it in this case.

Besides, if I don't have libvirt installed on my box (e.g. because I use xenserver/xpc or vmware) and I see these all sorts of logging traces about libvirt:

No handlers could be found for logger "nova.virt.libvirt.firewall" WARNING Libvirt module could not be loaded. NWFilterFirewall will not work correctly. ...

I wonder if this should be avoided.