#!/bin/bash
echo "#####################################################"
echo "# Xen Clone (v1.0) - Glen Davis                     #"
echo "# Clone a SLES10 VM, change mac, hostname and ip    #"
echo "#####################################################"

# Creates a new SLES10 DomU (VM) from an existing SLES10 DomU (VM), the new VM will be cloned from the old VM, but given a new host name, mac address and ipaddress.  Thus you can create several "unique" servers from one installed SLES10 VM.
#Once finished the new DomU (VM) should boot without any additional configuration. 


#Disclaimer -- Currently works with a single NIC, and basic bridge setup.  
# Tested with cloning a SLES10 VM, where the VM was created from the SLES10 YaST Virtual Machine Management module. This script is known to work where the source VM has a static ipaddress and using traditional networking (IE not Network Manager). When finished the new DomU (VM) should appear in the YaST Xen Management screen with the other existing VMs.

#Config file and Image file locations (respectively)
conf_loc=/etc/xen/vm/
image_loc=/var/lib/xen/images/
#image_loc=/data1/
args=$@



id_check() {

        if [ `id -u` -ne 0 ]
        then
                echo "You must be root to run this script!"
		echo ID_check succeeded!
                exit 65
        fi
}

id_check

usage()
{
echo Usage: xenclone SourceVM NewVM new_ip
echo Example - xenclone vm1 vm2 10.0.0.2
echo
exit 1
}



if test -e "$conf_loc""$1" 
then
echo 
else
echo "$conf_loc""$1" does not exist, in that path. If needed edit xenclone conf_loc and/or image_loc paths
usage
fi


if test -e "$image_loc""$1""/hda" 
then
echo 
else
echo "$image_loc""$1""/hda" does not exist, in that path. If needed edit xenclone image_loc path.
usage
fi




# test if vm is running

vmtest=`xm list | grep $1 | awk '{ print $1 }'`
if test "$vmtest" = "$1"
then
echo DomU $1 is currently running on Xen, please shutdown before cloning.
echo Exiting...
exit 1
else
echo 
fi




# Make sure the user specifies arguments
error_check() 
{
total=`echo $args | awk 'END { print NF }'`
     
     if [ $total -lt 3 ];  then
        
	usage
     fi

}

error_check

random_num()
{
	# Get random numbers to specify Mac address
	SPOTS=10   # Modulo 6 gives range 0 - 9.
# 	num1=0
# 	num2=0
# 	num3=0
# 	num4=0
# 	num5=0
# 	num6=0
# 	num7=0
# 	num8=0
	
    let "num1 = $RANDOM % $SPOTS" 
    let "num2 = $RANDOM % $SPOTS" 
    let "num3 = $RANDOM % $SPOTS" 
    let "num4 = $RANDOM % $SPOTS" 
    let "num5 = $RANDOM % $SPOTS" 
    let "num6 = $RANDOM % $SPOTS"     
    let "num7 = $RANDOM % $SPOTS" 
    let "num8 = $RANDOM % $SPOTS"        

}

random_num


echo -n Copying config
cp -v "$conf_loc""$1" "$conf_loc""$2" 
echo
# create directory if it does not exist
mkdir -p "$image_loc""$2"
echo -n Copying image 
#cp -v "$image_loc""$1""/hda" "$image_loc""$2"
cp -v $image_loc""$1""/* "$image_loc""$2"
echo Copy Finished!
echo

echo "Editing config file, assigning random Mac address, and editing DomU name."

# set some variables, if "type" is found consider it FV
fvtrue=`cat "$conf_loc"tmp.txt | grep type`
pvmac=`cat "$conf_loc"tmp.txt | grep mac`

sed "s/$1/$2/g" "$conf_loc""$2" > "$conf_loc"tmp.txt
sleep 1

if cat "$conf_loc"tmp.txt | grep type
then
mac1=`echo $fvtrue | awk -F "," '{ print $2 }'`
sleep 1
sed s/$mac1/"mac=00:16:3E:$num3$num4:$num5$num6:$num7$num8"/ "$conf_loc"tmp.txt > "$conf_loc""$2"
echo
echo "Your new HWaddr 00:16:3E:$num3$num4:$num5$num6:$num7$num8"
fi

if ! cat "$conf_loc"tmp.txt | grep type
then
mac1=`echo $pvmac | awk -F "'" '{ print $2 }'`
sleep 1
echo "Your new assigned HWaddr 00:16:3E:$num3$num4:$num5$num6:$num7$num8"
sed s/$mac1/"mac=00:16:3E:$num3$num4:$num5$num6:$num7$num8"/ "$conf_loc"tmp.txt > "$conf_loc""$2"
fi






# old code - didn't work for FV guests
#sed "s/$1/$2/g" "$conf_loc""$2" > "$conf_loc"/tmp.txt
#sed /vif/d "$conf_loc"/tmp.txt > "$conf_loc""$2"
#echo vif = [ "'"mac=00:16:$num1$num2:$num3$num4:$num5$num6:$num7$num8"'" ] >> "$conf_loc""$2"
#rm "$conf_loc"/tmp.txt


# mount image loop back and change ipaddress, host and networking config
mkdir -p /xentmp
lomount -diskimage "$image_loc""$2"/hda -partition 2 /xentmp


echo Changing Network settings.

# new code

sleep 1
cd /xentmp/etc/sysconfig/network/
sleep 1
oldethid=`ls | grep ifcfg-eth-id`

#if -n $oldethid 
if ls | grep ifcfg-eth-id
then
  cp $oldethid ifcfg-eth0
  mkdir -p oldether
  mv ifcfg-eth-id* ./oldether/ 
fi

sed /IPADDR/d ./ifcfg-eth0 > ./ifcfg-tmp
sleep 1

echo IPADDR="'"$3"'" >> ./ifcfg-tmp
mv ifcfg-tmp ifcfg-eth0
# rm ./ifcfg-tmp


cd /xentmp/etc/udev/rules.d/
cp 30-net_persistent_names.rules 30-net_persistent_names.old
sed /SUBSYSTEM/d 30-net_persistent_names.rules > 30.new
mv 30.new 30-net_persistent_names.rules

# end new code


#  This is the original - redoing this
# sleep 1
# cd /xentmp/etc/sysconfig/network/
# sleep 1
# oldeth=`ls | grep ifcfg-eth | tail -1`
# oldethid=`ls | grep ifcfg-eth-id`
# #echo oldnum is $oldethid
# sleep 1
# cd /xentmp/etc/sysconfig/network/
# cp ./$oldeth ./ifcfg-tmp
# sleep 1
# 
# if [ -f $oldethid ]
# then
#   mkdir -p oldether
#   mv ifcfg-eth-id* ./oldether/ 
# fi
#ethnumm=ls | grep ifcfg-eth | tail -1 | awk -F"ifcfg-eth" '{ print $2 }'
#ethnumm=$(($ethnumm+1))
# sed /IPADDR/d ./ifcfg-tmp > ./ifcfg-eth$ethnumm
# 
# sleep 1
# rm ./ifcfg-tmp
# echo IPADDR="'"$3"'" >> ./ifcfg-eth$ethnumm



echo Changing HOSTNAME file.
cd /xentmp/etc
oldhost=`cat /xentmp/etc/HOSTNAME | awk -F"." '{ print $1 }'`
sleep 1
sed "s/$oldhost/$2/g" ./HOSTNAME > ./Hnew
sleep 1
mv ./Hnew ./HOSTNAME
sleep 1

echo Changing hosts file.
sed "s/$oldhost/$2/g" ./hosts > ./Hnew1
sleep 1
oldip=`tail -1 /xentmp/etc/Hnew1 | awk '{ print $1 }'`
sleep 1
sed "s/$oldip/$3/g" ./Hnew1 > ./hosts
sleep 1
rm ./Hnew1
sleep 1
cd /
sleep 1
umount /xentmp
sleep 1
echo Clone is complete. New VM "$conf_loc""$2" is ready to start!

exit