examples/dominfo.py

   1 #!/usr/bin/env python
   2 # dominfo - print some information about a domain
   3
   4 import libvirt
   5 import sys
   6 import os
   7 import libxml2
   8 import pdb
   9
  10 def usage():
  11    print('Usage: %s DOMAIN' % sys.argv[0])
  12    print('       Print information about the domain DOMAIN')
  13
  14 def print_section(title):
  15     print("\n%s" % title)
  16     print("=" * 60)
  17
  18 def print_entry(key, value):
  19     print("%-10s %-10s" % (key, value))
  20
  21 def print_xml(key, ctx, path):
  22     res = ctx.xpathEval(path)
  23     if res is None or len(res) == 0:
  24         value="Unknown"
  25     else:
  26         value = res[0].content
  27     print_entry(key, value)
  28     return value
  29
  30 if len(sys.argv) != 2:
  31     usage()
  32     sys.exit(2)
  33
  34 name = sys.argv[1]
  35
  36 # Connect to libvirt
  37 conn = libvirt.openReadOnly(None)
  38 if conn is None:
  39     print('Failed to open connection to the hypervisor')
  40     sys.exit(1)
  41
  42 try:
  43     dom = conn.lookupByName(name)
  44     # Annoyiingly, libvirt prints its own error message here
  45 except libvirt.libvirtError:
  46     print("Domain %s is not running" % name)
  47     sys.exit(0)
  48
  49 info = dom.info()
  50 print_section("Domain info")
  51 print_entry("State:", info[0])
  52 print_entry("MaxMem:", info[1])
  53 print_entry("UsedMem:", info[2])
  54 print_entry("VCPUs:", info[3])
  55
  56 # Read some info from the XML desc
  57 xmldesc = dom.XMLDesc(0)
  58 doc = libxml2.parseDoc(xmldesc)
  59 ctx = doc.xpathNewContext()
  60 print_section("Kernel")
  61 print_xml("Type:", ctx, "/domain/os/type")
  62 print_xml("Kernel:", ctx, "/domain/os/kernel")
  63 print_xml("initrd:", ctx, "/domain/os/initrd")
  64 print_xml("cmdline:", ctx, "/domain/os/cmdline")
  65
  66 print_section("Devices")
  67 devs = ctx.xpathEval("/domain/devices/*")
  68 for d in devs:
  69     ctx.setContextNode(d)
  70     #pdb.set_trace()
  71     type = print_xml("Type:", ctx, "@type")
  72     if type == "file":
  73         print_xml("Source:", ctx, "source/@file")
  74         print_xml("Target:", ctx, "target/@dev")
  75     elif type == "block":
  76         print_xml("Source:", ctx, "source/@dev")
  77         print_xml("Target:", ctx, "target/@dev")
  78     elif type == "bridge":
  79         print_xml("Source:", ctx, "source/@bridge")
  80         print_xml("MAC Addr:", ctx, "mac/@address")