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I don't think there's much I disagree with here.

Libguestfs is useful for injecting "firstboot" scripts (scripts that
run the first time a guest boots and then disable themselves).  That
seems simpler than the DHCP-based method you outlined, at least for
guests that libguestfs can recognize.  But probably it's a good idea
to support many different methods.

As an aside, I hope to add Cirros detection to libguestfs soon.

Rich.

-- 
Richard Jones
Red Hat