#!/bin/bash

# -------------------------------------------------------------------------- #
# Copyright 2002-2015, OpenNebula Project (OpenNebula.org), C12G Labs        #
#                                                                            #
# 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/BRIDGE_LIST \
                    /DS_DRIVER_ACTION_DATA/IMAGE/FSTYPE \
                    /DS_DRIVER_ACTION_DATA/IMAGE/SIZE)

unset i

BASE_PATH="${XPATH_ELEMENTS[i++]}"
RESTRICTED_DIRS="${XPATH_ELEMENTS[i++]}"
SAFE_DIRS="${XPATH_ELEMENTS[i++]}"
BRIDGE_LIST="${XPATH_ELEMENTS[i++]}"
FSTYPE="${XPATH_ELEMENTS[i++]}"
SIZE="${XPATH_ELEMENTS[i++]}"

set_up_datastore "$BASE_PATH" "$RESTRICTED_DIRS" "$SAFE_DIRS"

DST=`generate_image_path`

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

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

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

MKFS_CMD=`mkfs_command $DST $FSTYPE $SIZE`

REMOTE_REGISTER_CMD=$(cat <<EOF
    set -e
    export PATH=/usr/sbin:/sbin:\$PATH

    mkdir -p $BASE_PATH
    $DD if=/dev/zero of=$DST bs=1 count=1 seek=${SIZE}M
    $MKFS_CMD
EOF
)

if [ -n "$BRIDGE_LIST" ]; then
    DST_HOST=`get_destination_host $ID`

    ssh_exec_and_log "$DST_HOST" "$REMOTE_REGISTER_CMD" \
        "Error registering $RBD_SOURCE in $DST_HOST"

else
    mkdir -p "$BASE_PATH"

    exec_and_log "$DD if=/dev/zero of=$DST bs=1 count=1 seek=${SIZE}M" \
        "Could not create image $DST"
    exec_and_log "$MKFS_CMD" \
        "Unable to create filesystem $FSTYPE in $DST"
fi

echo "$DST"
