I'd like a convenient way to add dhcp info for libvirt guests (to libvirt's internal dhcp server).

I'm thinking something along the lines of

      Libvirt.dhcp  "default" (MAC "52:54:00:00:00:01") (IPv4 "")

where I guess the MAC (or a better name?) has to be defined. "default" is the libvirt network name. That property (and the undo) would translate into some call to "virsh net-update".

This presumably needs a way to assign a matching MAC to the guest. We could maybe provide a convenience API that did both to avoid mismatches.

I don't so far see a nice way to update the mac address on the guest. There is a --network mac= for virt-install, so maybe an optional parameter for defined? I guess it needs to be different function, called by defined to avoid breaking API?