Celoteh Harian + *nix

This is python and libvirt related post, beware!! Ok now I want to check from my script, let's say : bash> xencheck.py nameofvps So I want the script to check if the vps name is available and active. This is what I done : #!/usr/bin/python -u import libvirt import sys import os def Startup():  if not os.access("/proc/xen", os.R_OK):     print "System is not running Xen kernel!"     sys.exit(1) #connect to hypervisor conn = libvirt.open("xen:///default") if conn == None:     print 'Failed to connect to hypervisor'     sys.exit(1) dom0 = conn.listDomainsID() for id in dom0:  dom1 = conn.lookupByID(id)  if dom1.name() == sys.argv[1]:   print dom1.name() #main function to execute def main():  Startup() if __name__ == "__main__":  main()