Initial stab at libvirt to ganeti

libvirt2ganeti.py

import libvirt
from lxml import etree

sort_disks = lambda d: next(d.iter("target")).get("dev")

def main(host, opts):
    #Connect to some hypervisor.
    conn=libvirt.open("qemu:///system")

    #Iterate through all available domains.
    for id in conn.listDomainsID():
        #Initialize the domain object.
        dom=conn.lookupByID(id)

        tree=etree.fromstring(dom.XMLDesc(0))

        # Set up basic command
        print "gnt-instance add -n", host, opts,

        # Add a sorted list of mac addresses
        macs = set(s.get("address") for s in tree.xpath("devices/interface/mac"))
        for i, mac in enumerate(filter(None, macs)):
            print "--net=%d:mac=%s" % (i, mac),

        # Add a sorted list of disks
        disks = tree.xpath('//devices/disk[@device="disk"]')
        for i, dev in enumerate(sorted(disks, key=sort_disks)):
            print "--disk %d:adopt=%s" % (i, next(dev.iter("source")).get("dev")),

        # Hostname (with domain fix)
        print "%s.xentower.nl" % dom.name()

if __name__=="__main__":
    main("green.xentower.nl", "-t plain -o debootstrap+default")