#!/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
source ${DRIVER_PATH}/iscsi.conf

# -------- 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/DATASTORE/TEMPLATE/HOST \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/VG_NAME \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/BASE_IQN \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/BASE_TID \
                    /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]}"
DST_HOST="${XPATH_ELEMENTS[4]:-$HOST}"
VG_NAME="${XPATH_ELEMENTS[5]:-$VG_NAME}"
BASE_IQN="${XPATH_ELEMENTS[6]:-$BASE_IQN}"
BASE_TID="${XPATH_ELEMENTS[7]:-$BASE_TID}"
FSTYPE="${XPATH_ELEMENTS[8]}"
SIZE="${XPATH_ELEMENTS[9]:-0}"

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

LV_NAME="lv-one-${ID}"
IQN="$BASE_IQN:$DST_HOST.$VG_NAME.$LV_NAME"
DEV="/dev/$VG_NAME/$LV_NAME"

let TID=ID+BASE_TID

REGISTER_CMD=$(cat <<EOF
    set -e
    $SUDO $LVCREATE -L${SIZE}M ${VG_NAME} -n ${LV_NAME}
    $SUDO $(tgtadm_target_new "$TID" "$IQN")
    $SUDO $(tgtadm_target_bind_all "$TID")
    $SUDO $(tgtadm_logicalunit_new "$TID" "$DEV")
    $SUDO $(mkfs_command "$DEV" "$FSTYPE")
EOF
)

# ------------ 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 ------------

ssh_exec_and_log "$DST_HOST" "$REGISTER_CMD" \
    "Error registering $DST_HOST:$DEV"

echo "$IQN $SIZE"
