#!/bin/bash

# -------------------------------------------------------------------------- #
# Copyright 2002-2012, OpenNebula Project Leads (OpenNebula.org)             #
#                                                                            #
# Licensed 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.                                             #
#--------------------------------------------------------------------------- #

###############################################################################
# This script is used to create a VM image (SRC) of size (SIZE) and formatted
# as (FS)
###############################################################################

# -------- Set up the environment to source common tools & conf ------------

if [ -z "${ONE_LOCATION}" ]; then
    LIB_LOCATION=/usr/lib/one
else
    LIB_LOCATION=$ONE_LOCATION/lib
fi

. $LIB_LOCATION/sh/scripts_common.sh

DRIVER_PATH=$(dirname $0)
source ${DRIVER_PATH}/../libfs.sh

# -------- Get mkfs and datastore arguments from OpenNebula core ------------

DRV_ACTION=$1
ID=$2

XPATH="${DRIVER_PATH}/../xpath.rb -b $DRV_ACTION"

unset i XPATH_ELEMENTS

while IFS= read -r -d '' element; do
    XPATH_ELEMENTS[i++]="$element"
done < <($XPATH     /DS_DRIVER_ACTION_DATA/DATASTORE/BASE_PATH \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/RESTRICTED_DIRS \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/SAFE_DIRS \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/UMASK \
                    /DS_DRIVER_ACTION_DATA/IMAGE/FSTYPE \
                    /DS_DRIVER_ACTION_DATA/IMAGE/SIZE)

BASE_PATH="${XPATH_ELEMENTS[0]}"
RESTRICTED_DIRS="${XPATH_ELEMENTS[1]}"
SAFE_DIRS="${XPATH_ELEMENTS[2]}"
UMASK="${XPATH_ELEMENTS[3]}"
FSTYPE="${XPATH_ELEMENTS[4]}"
SIZE="${XPATH_ELEMENTS[5]}"

mkdir -p "$BASE_PATH"
set_up_datastore "$BASE_PATH" "$RESTRICTED_DIRS" "$SAFE_DIRS" "$UMASK"

DST=`generate_image_path`

# ------------ Image to save_as disk, no need to create a FS ------------

if [ "$FSTYPE" = "save_as" ]; then
    echo "$DST $SIZE"
    exit 0
fi

# ------------ Create the image to the repository ------------

DISK=$DST/disk.vmdk
DISK_TMP=$DISK.tmp

IMAGE_FORMAT=vmdk

MKFS_CMD=`mkfs_command $DISK_TMP $FSTYPE`

exec_and_log "mkdir -p $DST" \
    "Could not create disk directory $DST"
exec_and_log "$DD if=/dev/zero of=$DISK_TMP bs=1 count=1 seek=${SIZE}M" \
    "Could not create temporary image $DISK_TMP"
exec_and_log "$MKFS_CMD" \
    "Unable to create filesystem $FSTYPE in $DISK_TMP"
exec_and_log "$QEMU_IMG convert -O $IMAGE_FORMAT $DISK_TMP $DISK" \
    "Unable to convert to $IMAGE_FORMAT in $DISK_TMP"
exec_and_log "rm -f $DISK_TMP" \
    "Unable to remove temporary disk $DISK_TMP"

# ---------------- Get the size of the image ------------

SIZE=`qemu_size $DISK`

echo "$DST $SIZE"
