Go from a dom_id to an IP address for a libvirt domain

gistfile1.py

import libvirt
from xml.dom import minidom

DNSMASQ_LEASES = "/var/lib/libvirt/dnsmasq/default.leases"

def dom_id_to_ip(dom_id):
    conn = libvirt.openReadOnly('qemu:///system')
    dom = conn.lookupByID(dom_id)

    output = dom.XMLDesc(0)
    xmldoc = minidom.parseString(output)

    mac = xmldoc.getElementsByTagName('mac')[0].attributes['address'].value
    with open(DNSMASQ_LEASES) as lease_file:
        # example line: 1388705961 52:54:00:45:e1:c7 192.168.122.155 * *
        for line in lease_file:
            line_split = line.split()
            if mac == line_split[1]:
                return line_split[2]
    # Didn't find it
    return None