nbolte

#!/bin/sh
VG_NAME="vg_virtualbox"
LV_NAME="lv_vms"
LV_BACKUP_NAME="${LV_NAME}_backup"

MOUNT_LOCATION="/mnt/${LV_BACKUP_NAME}"

LVCREATE=$(which lvcreate)
if [[ $? != 0 ]]; then
  echo "lvcreate not found!"
  exit 1
fi
LVREMOVE=$(which lvremove)
if [[ $? != 0 ]]; then
  echo "lvremove not found!"
  exit 1
fi

function pre_backup()
  {
  if [[ -L /dev/$VG_NAME/$LV_BACKUP_NAME ]]; then
    echo "Logical Volume: ${LV_BACKUP_NAME} already exists"
    exit 1
  fi

  $LVCREATE -l100%FREE -s -n $LV_BACKUP_NAME /dev/$VG_NAME/$LV_NAME
  if [[ $? != 0 ]]; then
    echo "lvcreate failed."
    exit 1
  fi

  if [[ ! -d $MOUNT_LOCATION ]]; then
    mkdir -p $MOUNT_LOCATION
    if [[ $? != 0 ]]; then
      echo "Could not create mountpoint: ${MOUNT_LOCATION}"
      exit 1
    fi
  fi
  mount -o ro /dev/$VG_NAME/$LV_BACKUP_NAME $MOUNT_LOCATION
  }

function post_backup()
  {
  # Do not care about the exit state from umount.
  umount $MOUNT_LOCATION
  if [[ -L /dev/$VG_NAME/$LV_BACKUP_NAME ]]; then
    lvremove -f /dev/$VG_NAME/$LV_BACKUP_NAME
  else
    echo "Logical Volume: ${LV_BACKUP_NAME} not found"
    exit 1
  fi
  }



if [[ "$1" == "pre" ]]; then
 pre_backup
elif [[ "$1" == "post" ]]; then
 post_backup
else
  echo "Usage: $0 <command>"
  echo "Commands available:"
  echo "    pre             Runs pre backup tasks (create LVM snapshot)"
  echo "    post            Runs post backup tasks (Delete LVM snapshot)"
  exit -1
fi

exit 0