text: #!/usr/bin/env python
  # dominfo - print some information about a domain
  
  import libvirt
  import sys
  import os
  import libxml2
  import pdb
  
  def usage():
     print('Usage: %s DOMAIN' % sys.argv[0])
     print('       Print information about the domain DOMAIN')
  
  def print_section(title):
      print("\n%s" % title)
      print("=" * 60)
  
  def print_entry(key, value):
      print("%-10s %-10s" % (key, value))
  
  def print_xml(key, ctx, path):
      res = ctx.xpathEval(path)
      if res is None or len(res) == 0:
          value="Unknown"
      else:
          value = res[0].content
      print_entry(key, value)
      return value
  
  if len(sys.argv) != 2:
      usage()
      sys.exit(2)
  
  name = sys.argv[1]
  
  # Connect to libvirt
  conn = libvirt.openReadOnly("qemu:///system")
  if conn is None:
      print('Failed to open connection to the hypervisor')
      sys.exit(1)
  
  try:
      dom = conn.lookupByName(name)
      # Annoyiingly, libvirt prints its own error message here
  except libvirt.libvirtError:
      print("Domain %s is not running" % name)
      sys.exit(0)
  
  info = dom.info()
  print_section("Domain info")
  print_entry("State:", info[0])
  print_entry("MaxMem:", info[1])
  print_entry("UsedMem:", info[2])
  print_entry("VCPUs:", info[3])
  
  # Read some info from the XML desc
  xmldesc = dom.XMLDesc(0)
  doc = libxml2.parseDoc(xmldesc)
  ctx = doc.xpathNewContext()
  print_section("Kernel")
  print_xml("Type:", ctx, "/domain/os/type")
  print_xml("Kernel:", ctx, "/domain/os/kernel")
  print_xml("initrd:", ctx, "/domain/os/initrd")
  print_xml("cmdline:", ctx, "/domain/os/cmdline")
  
  print_section("Devices")
  devs = ctx.xpathEval("/domain/devices/*")
  for d in devs:
      ctx.setContextNode(d)
      #pdb.set_trace()
      type = print_xml("Type:", ctx, "@type")
      if type == "file":
          print_xml("Source:", ctx, "source/@file")
          print_xml("Target:", ctx, "target/@dev")
      elif type == "block":
          print_xml("Source:", ctx, "source/@dev")
          print_xml("Target:", ctx, "target/@dev")
      elif type == "bridge":
          print_xml("Source:", ctx, "source/@bridge")
          print_xml("MAC Addr:", ctx, "mac/@address")
  