#!/bin/bash
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
# 
#   http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

#set -x
 
usage() {
  printf "Usage: %s [vhd file in secondary storage] [template directory in secondary storage] [template local dir] \n" $(basename $0) 
}
options='tcp,soft,timeo=133,retrans=1'
cleanup()
{
  if [ ! -z $snapshotdir ]; then 
    umount $snapshotdir
    if [ $? -eq 0 ];  then
      rmdir $snapshotdir
    fi
  fi
  if [ ! -z $templatedir ]; then 
    umount $templatedir
    if [ $? -eq 0 ];  then
      rmdir $templatedir
    fi
  fi
}

if [ -z $1 ]; then
  usage
  echo "2#no vhd file path"
  exit 0
else
  snapshoturl=${1%/*}
  vhdfilename=${1##*/}
fi

if [ -z $2 ]; then
  usage
  echo "3#no template path"
  exit 0
else
  templateurl=$2
fi

if [ -z $3 ]; then
  usage
  echo "3#no template local dir"
  exit 0
else
  tmpltLocalDir=$3
fi


snapshotdir=/var/run/cloud_mount/$(uuidgen -r)
mkdir -p $snapshotdir
if [ $? -ne 0 ]; then
  echo "4#can't make dir $snapshotdir"
  exit 0
fi

mount -o $options $snapshoturl $snapshotdir
if [ $? -ne 0 ]; then
  rmdir $snapshotdir
  echo "5#can not mount $snapshoturl to $snapshotdir"
  exit 0
fi

templatedir=/var/run/cloud_mount/$tmpltLocalDir
mkdir -p $templatedir
if [ $? -ne 0 ]; then
  templatedir=""
  cleanup
  echo "6#can't make dir $templatedir"
  exit 0
fi

mount -o $options $templateurl $templatedir
if [ $? -ne 0 ]; then
  rmdir $templatedir
  templatedir=""
  cleanup
  echo "7#can not mount $templateurl to $templatedir"
  exit 0
fi

VHDUTIL="/opt/cloud/bin/vhd-util"

copyvhd()
{
  local desvhd=$1
  local srcvhd=$2
  local parent=
  parent=`$VHDUTIL query -p -n $srcvhd`
  if [ $? -ne 0 ]; then
    echo "30#failed to query $srcvhd"
    cleanup
    exit 0
  fi
  if [[ "${parent}"  =~ " no parent" ]]; then
    dd if=$srcvhd of=$desvhd bs=2M     
    if [ $? -ne 0 ]; then
      echo "31#failed to dd $srcvhd to $desvhd"
      cleanup
      exit 0
    fi
  else
    copyvhd $desvhd $parent
    $VHDUTIL coalesce -p $desvhd -n $srcvhd
    if [ $? -ne 0 ]; then
      echo "32#failed to coalesce  $desvhd to $srcvhd"
      cleanup
      exit 0
    fi
  fi
}

templateuuid=$(uuidgen -r)
desvhd=$templatedir/$templateuuid.vhd
srcvhd=$snapshotdir/$vhdfilename
copyvhd $desvhd $srcvhd
virtualSize=`$VHDUTIL query -v -n $desvhd`
physicalSize=`ls -l $desvhd | awk '{print $5}'`
cleanup
echo "0#$templateuuid#$physicalSize#$virtualSize"
exit 0
