#!/usr/bin/env python3
"""
Check that the domain described by DOMAIN.XML is running.
If the domain is not running, create it.
"""

import libvirt
import libxml2
from argparse import ArgumentParser


# Parse the XML description of domU from FNAME
# and return a tuple (name, xmldesc) where NAME
# is the name of the domain, and xmldesc is the contetn of FNAME
def read_domain(fname: str) -> tuple[str, str]:
    fp = open(fname, "r")
    xmldesc = fp.read()
    fp.close()

    doc = libxml2.parseDoc(xmldesc)
    name = doc.xpathNewContext().xpathEval("/domain/name")[0].content
    return (name, xmldesc)


parser = ArgumentParser(description=__doc__)
parser.add_argument("file", metavar="DOMAIN.XML", help="XML configuration of the domain in libvirt's XML format")
args = parser.parse_args()

name, xmldesc = read_domain(args.file)

try:
    conn = libvirt.open(None)
except libvirt.libvirtError:
    print('Failed to open connection to the hypervisor')
    exit(1)

try:
    dom = conn.lookupByName(name)
except libvirt.libvirtError:
    print("Starting domain %s ... " % name)
    dom = conn.createLinux(xmldesc, 0)
    if dom is None:
        print("failed")
        exit(1)
    else:
        print("done")
