#!/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 remove a VM image (SRC) from the image repository
###############################################################################

# ------------ Set up the environment to source common tools ------------
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 rm 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/IMAGE/SOURCE \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/HOST \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/BASE_TID)

SRC="${XPATH_ELEMENTS[0]}"
DST_HOST="${XPATH_ELEMENTS[1]:-$HOST}"
BASE_TID="${XPATH_ELEMENTS[2]:-$BASE_TID}"

BASE_IQN=`echo $SRC|$CUT -d: -f1`
TARGET=`echo $SRC|$CUT -d: -f2`
LV_NAME=`echo $TARGET|$AWK -F. '{print $(NF)}'`
VG_NAME=`echo $TARGET|$AWK -F. '{print $(NF-1)}'`
DEV="/dev/$VG_NAME/$LV_NAME"

let TID=ID+BASE_TID

RM_COMMAND=$(cat <<EOF
    $SUDO $(tgtadm_target_delete "$TID")
    $SUDO $LVREMOVE -f $VG_NAME/$LV_NAME
EOF
)

log "Removing $DST_HOST:$DEV from the image repository"

ssh_exec_and_log "$DST_HOST" "$RM_COMMAND" \
    "Error removing $DST_HOST:$DEV"

exit 0
