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fence_virsh.py

#!/usr/bin/python

# The Following Agent Has Been Tested On:
#
# Virsh 0.3.3 on RHEL 5.2 with xen-3.0.3-51
#

import sys, re, pexpect, exceptions
sys.path.append("@FENCEAGENTSLIBDIR@")
from fencing import *

#BEGIN_VERSION_GENERATION
RELEASE_VERSION="Virsh fence agent"
REDHAT_COPYRIGHT=""
BUILD_DATE=""
#END_VERSION_GENERATION

def get_outlets_status(conn, options):
      try:
            conn.sendline("virsh list --all")
            conn.log_expect(options, options["-c"], int(options["-Y"]))
      except pexpect.EOF:
            fail(EC_CONNECTION_LOST)
      except pexpect.TIMEOUT:
            fail(EC_TIMED_OUT)

      result={}

        #This is status of mini finite automata. 0 = we didn't found Id and Name, 1 = we did
        fa_status=0

        for line in conn.before.splitlines():
              domain=re.search("^\s*(\S+)\s+(\S+)\s+(\S+).*$",line)

                if (domain!=None):
                  if ((fa_status==0) and (domain.group(1).lower()=="id") and (domain.group(2).lower()=="name")):
                        fa_status=1
                  elif (fa_status==1):
                        result[domain.group(2)]=("",(domain.group(3).lower() in ["running","blocked","idle","no state","paused"] and "on" or "off"))
      return result

def get_power_status(conn, options):
      outlets=get_outlets_status(conn,options)

        if (not (options["-n"] in outlets)):
                fail_usage("Failed: You have to enter existing name of virtual machine!")
        else:
                return outlets[options["-n"]][1]

def set_power_status(conn, options):
      try:
            conn.sendline("virsh %s "%(options["-o"] == "on" and "start" or "destroy")+options["-n"])

            conn.log_expect(options, options["-c"], int(options["-g"]))
                time.sleep(1)

      except pexpect.EOF:
            fail(EC_CONNECTION_LOST)
      except pexpect.TIMEOUT:
            fail(EC_TIMED_OUT)

def main():
      device_opt = [  "help", "version", "agent", "quiet", "verbose", "debug",
                  "action", "ipaddr", "login", "passwd", "passwd_script",
                  "secure", "identity_file", "test", "port", "separator",
                  "inet4_only", "inet6_only", "ipport",
                  "power_timeout", "shell_timeout", "login_timeout", "power_wait" ]

      atexit.register(atexit_handler)

      pinput = process_input(device_opt)
      pinput["-x"] = 1
      options = check_input(device_opt, pinput)

      ## Defaults for fence agent
      if 0 == options.has_key("-c"):
            options["-c"] = "\[EXPECT\]#\ "

      options["ssh_options"]="-t '/bin/bash -c \"PS1=\[EXPECT\]#\  /bin/bash --noprofile --norc\"'"

      docs = { }
      docs["shortdesc"] = "Fence agent for virsh"
      docs["longdesc"] = "fence_virsh is an I/O Fencing agent \
which can be used with the virtual machines managed by libvirt. \
It logs via ssh to a dom0 and there run virsh command, which does \
all work. \
\n.P\n\
By default, virsh needs root account to do properly work. So you \
must allow ssh login in your sshd_config."
      show_docs(options, docs)

      ## Operate the fencing device
      conn = fence_login(options)
      result = fence_action(conn, options, set_power_status, get_power_status, get_outlets_status)

      ## Logout from system
      try:
            conn.sendline("quit")
            conn.close()
      except exceptions.OSError:
            pass
      except pexpect.ExceptionPexpect:
            pass

      sys.exit(result)
if __name__ == "__main__":
      main()

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