lvm backup of vbox

#!/bin/bash
set -x
if [ $# -ne 2 ]; then
  echo "need to provide two paramaters"
  echo "example backup.sh /mnt/backup vm1"
  echo "where /mnt/backup is the location to store the backup file"
  echo "vm1 is the machine or volume to backup"
  echo "vm1 is used to backup the vm; all other paramaters backup a volume"
  exit 1
fi

BACKUP=$1
VOL=$2
DATE=`date +%Y-%m-%d`
LOG=$BACKUP/log/$VOL.$DATE.log
NOTIFY="[email protected]"

mkdir  $BACKUP/$VOL

function pause(){
   read -p "$*"
}

createsnap () {
VOLUME=$1
LOG=$2
echo "in createsnap: " $VOLUME $LOG
if ! /sbin/lvcreate -L10GB -s -n $VOLUME-snap /dev/vol/$VOLUME > $LOG 2>&1
then
   echo "error creating snapshot $VOLUME " >> $LOG
   /usr/bin/mail -s "backup error" $NOTIFY <  $LOG
   exit 1
 else
    echo "created snapshot $VOLUME" >> $LOG
 fi
}

deletesnap () {
VOLUME=$1
LOG=$2
if ! /sbin/lvremove -f /dev/vol/$VOLUME-snap   >> $LOG 2>&1
then
   echo "error removing snapshot $VOLUME" >> $LOG
   /usr/bin/mail -s "backup error" $NOTIFY <  $LOG
   exit 1
else
   echo "$VOLUME snapshot removed" >> $LOG
fi
}

backupsnap () {
VOLUME=$1
LOG=$2
BACKUP=$3

if ! /bin/dd if=/dev/vol/$VOLUME-snap of=/dev/stdout bs=1M | gzip > $BACKUP/$VOLUME/$VOLUME.$DATE.img.gz
then
   echo "error taking $VOLUME image" >> $LOG
   /usr/bin/mail -s "backup error" $NOTIFY <  $LOG
   exit 1
else
   echo "copied image $VOLUME"  >> $LOG
fi
}


case "$VOL" in
   vm1)
      echo "backup vm1"
      echo "pause vm"
      VOLLIST='vm1 vm1-data1 vm1-data2'
      /usr/bin/virsh suspend vm1
      echo "create snapshots for each data volume"
      for VOL in $VOLLIST
      do
         echo "create snapshot for: "  $VOL
         createsnap $VOL $LOG
      done
      echo "resume vm1"
      /usr/bin/virsh resume vm1
      echo "backup each data volue"
      for VOL in $VOLLIST
      do
         echo "make sure there is a folder to backup into "
         mkdir $BACKUP/$VOL
         echo "backup the data volume: "  $VOL
         backupsnap $VOL $LOG $BACKUP
      done
      for VOL in $VOLLIST
      do
         echo "delete the snapshot for:  "  $VOL
         deletesnap $VOL $LOG
      done
      echo "backup successful"
      ;;
   *)
      echo "not backing up vm1"
      echo "backing up the volumes"
      if ! /sbin/lvcreate -L10GB -s -n $VOL-snap /dev/vol/$VOL > $LOG 2>&1
      then
         echo "error creating snapshot $VOL " >> $LOG
         /usr/bin/mail -s "backup error" $NOTIFY <  $LOG
         exit 1
      else
         echo "created snapshot $VOL" >> $LOG
      fi

      if ! /bin/dd if=/dev/vol/$VOL-snap of=/dev/stdout bs=1M | gzip > $BACKUP/$VOL/$VOL.$DATE.img.gz
      then
         echo "error taking $VOL image" >> $LOG
         /usr/bin/mail -s "backup error" $NOTIFY <  $LOG
         exit 1
      else
         echo "copied image $VOL"  >> $LOG
      fi

      if ! /sbin/lvremove -f /dev/vol/$VOL-snap   >> $LOG 2>&1
      then
         echo "error removing snapshot $VOL" >> $LOG
         /usr/bin/mail -s "backup error" $NOTIFY <  $LOG
         exit 1
      else
         echo "$VOL snapshot removed" >> $LOG
      fi
      ;;
esac
sync
/usr/bin/mail -s "Backup of $VOL successful" $NOTIFY < $LOG