ovf-environment-properties-reader.py

#! /usr/bin/python
# Script to set network parameters from 'vmtoolsd --cmd "info-get guestinfo.ovfenv"'. It is designed for SLES 11 SP3
# Author: Willian Antunes
# Date of creation: September 03, 2014

import os, sys, time, subprocess, re
from xml.dom.minidom import parseString

def findXmlSection(dom, sectionName):
   sections = dom.getElementsByTagName(sectionName)
   return sections[0]

def getPropertyMap(ovfEnv):
   dom = parseString(ovfEnv)
   section = findXmlSection(dom, "PropertySection")
   propertyMap = {}
   for property in section.getElementsByTagName("Property"):
      key   = property.getAttribute("oe:key")
      value = property.getAttribute("oe:value")
      propertyMap[key] = value
   dom.unlink()
   return propertyMap

print "Issuing the command echo `vmtoolsd --cmd \"info-get guestinfo.ovfenv\"` to get the vApp configuration..."
ovfEnv = subprocess.Popen("echo `vmtoolsd --cmd \"info-get guestinfo.ovfenv\"`", shell=True, stdout=subprocess.PIPE).stdout.read()

propertyMap = getPropertyMap(ovfEnv)

ip      = propertyMap["ip"]
netmask = propertyMap["netmask"]
gateway = propertyMap["gateway"]
dns1    = propertyMap["dns1"]
dns2    = propertyMap["dns2"]
hostname    = propertyMap["hostname"]
domain    = propertyMap["domain"]
ntp    = propertyMap["ntp"]

print "The following properties will be used to set network parameters: "
print "--- IP: ", ip
print "--- Netmask: ", netmask
print "--- Gateway: ", gateway
print "--- Preferred DNS server: ", dns1
print "--- Alternate DNS server: ", dns2
print "--- Hostname: ", hostname
print "--- domain: ", domain
print "--- ntp: ", ntp

print "Cleaning up the device list..."
# It will prevent the case when the VM has two NICs. Generally it occurs when a new deploy is made
print subprocess.Popen("yast2 lan delete id=0 verbose", shell=True, stdout=subprocess.PIPE).stdout.read()
print subprocess.Popen("yast2 lan delete id=1 verbose", shell=True, stdout=subprocess.PIPE).stdout.read()
print "Obtaining device name..."
p = subprocess.Popen('yast2 lan list', shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
returnCode = p.wait() 
stdout = p.stdout.read()
deviceName = re.search(r'\s.*,', stdout).group().strip()[:-1]
print "Device name: ", deviceName

print "Configuring NTP parameters..."
print subprocess.Popen("yast2 ntp-client add server=%s" % (ntp), shell=True, stdout=subprocess.PIPE).stdout.read()
print subprocess.Popen("yast2 ntp-client enable", shell=True, stdout=subprocess.PIPE).stdout.read()
print "Configuring IP parameters..."
print subprocess.Popen("echo \"default %s - -\" > /etc/sysconfig/network/routes" % (gateway), shell=True, stdout=subprocess.PIPE).stdout.read()
print "Creating the file ifcfg-eth0..."
print subprocess.Popen("echo \"BOOTPROTO='static'\" > /etc/sysconfig/network/ifcfg-eth0", shell=True, stdout=subprocess.PIPE).stdout.read()
print subprocess.Popen("echo \"BROADCAST=''\" >> /etc/sysconfig/network/ifcfg-eth0", shell=True, stdout=subprocess.PIPE).stdout.read()
print subprocess.Popen("echo \"ETHTOOL_OPTIONS=''\" >> /etc/sysconfig/network/ifcfg-eth0", shell=True, stdout=subprocess.PIPE).stdout.read()
print subprocess.Popen("echo \"IPADDR='%s/%s'\" >> /etc/sysconfig/network/ifcfg-eth0" % (ip, netmask), shell=True, stdout=subprocess.PIPE).stdout.read()
print subprocess.Popen("echo \"MTU=''\" >> /etc/sysconfig/network/ifcfg-eth0", shell=True, stdout=subprocess.PIPE).stdout.read()
print subprocess.Popen("echo \"NAME='%s'\" >> /etc/sysconfig/network/ifcfg-eth0" % (deviceName), shell=True, stdout=subprocess.PIPE).stdout.read()
print subprocess.Popen("echo \"NETWORK=''\" >> /etc/sysconfig/network/ifcfg-eth0", shell=True, stdout=subprocess.PIPE).stdout.read()
print subprocess.Popen("echo \"REMOTE_IPADDR=''\" >> /etc/sysconfig/network/ifcfg-eth0", shell=True, stdout=subprocess.PIPE).stdout.read()
print subprocess.Popen("echo \"STARTMODE='auto'\" >> /etc/sysconfig/network/ifcfg-eth0", shell=True, stdout=subprocess.PIPE).stdout.read()
print subprocess.Popen("echo \"USERCONTROL='no'\" >> /etc/sysconfig/network/ifcfg-eth0", shell=True, stdout=subprocess.PIPE).stdout.read()
print "File created!"
print "Setting the current NIC to use 'eth0' as its name..."
print subprocess.Popen("head -n -1 /etc/udev/rules.d/70-persistent-net.rules | cat > /tmp/70-persistent-net.rules", shell=True, stdout=subprocess.PIPE).stdout.read()
netRules = subprocess.Popen("tail -n 1 /etc/udev/rules.d/70-persistent-net.rules", shell=True, stdout=subprocess.PIPE).stdout.read()
newNameValue = ", NAME=\"eth0\""
netRulesNew = netRules[:-(len(netRules)-netRules.rindex(','))] + newNameValue
# The command bellow will allow python to pass double quotes to the shell
netRulesNew = netRulesNew.replace("\"", "\\\"")
print subprocess.Popen("echo \"{0}\" >> /tmp/70-persistent-net.rules".format(netRulesNew), shell=True, stdout=subprocess.PIPE).stdout.read()
print subprocess.Popen("mv /tmp/70-persistent-net.rules /etc/udev/rules.d/70-persistent-net.rules", shell=True, stdout=subprocess.PIPE).stdout.read()
print "Configuring DNS parameters..."
print subprocess.Popen("sed -i \"s/NETCONFIG_DNS_STATIC_SERVERS=.*/NETCONFIG_DNS_STATIC_SERVERS=\\\"%s %s\\\"/g\" /etc/sysconfig/network/config" % (dns1, dns2), shell=True, stdout=subprocess.PIPE).stdout.read()
print subprocess.Popen("head -n -1 /etc/hosts | cat > /tmp/hosts", shell=True, stdout=subprocess.PIPE).stdout.read()
print subprocess.Popen("echo \"%s    %s.%s %s\" >> /tmp/hosts" % (ip, hostname, domain, hostname), shell=True, stdout=subprocess.PIPE).stdout.read()
print subprocess.Popen("mv /tmp/hosts /etc/hosts", shell=True, stdout=subprocess.PIPE).stdout.read()
print subprocess.Popen("echo \"{0}.{1}\" > /etc/HOSTNAME".format(hostname, domain), shell=True, stdout=subprocess.PIPE).stdout.read()
print subprocess.Popen("echo \"nameserver {0}\" >> /etc/resolv.conf".format(dns1), shell=True, stdout=subprocess.PIPE).stdout.read()
print subprocess.Popen("echo \"nameserver {0}\" >> /etc/resolv.conf".format(dns2), shell=True, stdout=subprocess.PIPE).stdout.read()
print "Restarting the network service..."
print subprocess.Popen("/etc/init.d/network restart", shell=True, stdout=subprocess.PIPE).stdout.read()
print "The configuration has been applied"