#!/bin/bash

# -------------------------------------------------------------------------- #
# Copyright 2002-2026, OpenNebula Project, OpenNebula Systems                #
#                                                                            #
# 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.                                             #
#--------------------------------------------------------------------------- #

# ------------------------------------------------------------------------------
#  Set up Environment and transfer arguments
# ------------------------------------------------------------------------------
#
#  libfs.sh & scripts_common.sh: includes tools and lib calls
# ------------------------------------------------------------------------------

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 stat and datastore arguments from OpenNebula core ------------

DRV_ACTION=`cat -`
ID=$1

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/PATH \
                /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/BRIDGE_LIST)

unset i

SRC="${XPATH_ELEMENTS[i++]}"
BRIDGE_LIST="${XPATH_ELEMENTS[i++]}"

# ------------------------------------------------------------------------------
#  Compute the size
# ------------------------------------------------------------------------------

SIZE=""

# Try local frontend
if [ -d "${SRC}" ]; then
    SIZE=$(du -sm "${SRC}" | cut -f1)
fi

# Try a bridge host if local failed
if [ -z "$SIZE" ] && [ -n "$BRIDGE_LIST" ]; then
    DST_HOST=$(get_destination_host "$ID")

    if [ -n "$DST_HOST" ]; then
        SIZE=$(ssh_exec_and_log "$DST_HOST" "if [ -d '$SRC' ]; then du -sm '$SRC' | cut -f1; fi" 2>/dev/null)
    fi
fi

echo "${SIZE:-0}"
