Get ip address of libvirt guest via virsh console

domipaddr.py

#!/usr/bin/python
# USAGE: python domipaddr.py qemu:///system HOSTNAME DISTRO INTERFACE USERNAME PASSWORD

import sys, pexpect
import pprint

SUPPORTED_DISTROS = [
    'ubuntu1404',
    'centos6',
    'centos7']

class DomIPAddr():


    def __init__(self, uri, domain, distro, interface, username, password):
        if distro not in SUPPORTED_DISTROS:
            print "Unsupported distro"
            sys.exit(2)

        self.uri = uri
        self.domain = domain
        self.distro = distro
        self.interface = interface
        self.username = username
        self.password = password
        self.ip_addr = None
        self.child = None

    def connect(self):
        self.child = pexpect.spawn("virsh -c %s console %s" % (self.uri, self.domain))
        self.child.expect('.*]')
        self.child.sendline('\r')
        self.child.expect('.*login: ')
        self.child.sendline(self.username)
        self.child.expect('.*assword:.*')
        self.child.sendline(self.password)
        self.child.sendline('\r')

    def get_ip(self):
        self.connect()
        self.child.expect('.*~.*')
        self.child.sendline("ip addr | grep -A3 '%s:' | grep 'inet ' | awk '{print $2}'\r" % self.interface)
        self.child.expect('.*/\d\d')
        self.child.sendline('exit')

    def parse_ip(self):
        output_parts = []
        if self.distro == 'centos6':
            split_chars = '\n'
        else:
            split_chars = '\r\n'

        # Janky hack.  Sometimes the output isn't captured correctly
        # so we fetch it again
        while len(output_parts) < 4:
            self.get_ip()
            output_parts = self.child.after.split(split_chars)
        self.ip_addr = output_parts[3].split('/')[0]


if __name__ == '__main__':
    get_ip = DomIPAddr(sys.argv[1], sys.argv[2], sys.argv[3], sys.argv[4], sys.argv[5], sys.argv[6])
    get_ip.get_ip()
    get_ip.parse_ip()

    print get_ip.ip_addr