#!/bin/bash

# -------------------------------------------------------------------------- #
# Copyright 2002-2017, 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.                                             #
#--------------------------------------------------------------------------- #
# mvds host:remote_system_ds/disk.i fe:SOURCE
#   - fe is the front-end hostname
#   - SOURCE is the path of the disk image in the form DS_BASE_PATH/disk
#   - host is the target host to deploy the VM
#   - remote_system_ds is the path for the system datastore in the host

SRC=$1
DST=$2
VM_ID=$3
DS_ID=$4

if [ -z "${ONE_LOCATION}" ]; then
    TMCOMMON=/var/lib/one/remotes/tm/tm_common.sh
else
    TMCOMMON=$ONE_LOCATION/var/remotes/tm/tm_common.sh
fi

source $TMCOMMON

DRIVER_PATH=$(dirname $0)

#-------------------------------------------------------------------------------
# Set dst path and dir
#-------------------------------------------------------------------------------
SRC_PATH=`arg_path $SRC`
SRC_HOST=`arg_host $SRC`

DST_PATH=`arg_path $DST`
DST_HOST=`arg_host $DST`

DISK_ID=$(echo $SRC_PATH|$AWK -F. '{print $NF}')
DS_SYS_ID=$(echo $SRC_PATH|$AWK -F/ '{print $(NF-2)}')

LV_NAME="lv-one-vm-$VM_ID-$DISK_ID"
VG_NAME="vg-one-$DS_SYS_ID"
DEV="/dev/${VG_NAME}/${LV_NAME}"

XPATH="${DRIVER_PATH}/../../datastore/xpath.rb --stdin"

unset i j XPATH_ELEMENTS

while IFS= read -r -d '' element; do
    XPATH_ELEMENTS[i++]="$element"
done < <(onevm show -x $VM_ID | $XPATH  \
                        /VM/LCM_STATE )

LCM_STATE="${XPATH_ELEMENTS[j++]}"

if [[ "$LCM_STATE" =~ ^(11|34|17)$ ]]; then

    XPATH="${DRIVER_PATH}/../../datastore/xpath.rb --stdin"
    IFS= read -r -d '' BRIDGE_LIST < <(onedatastore show -x "$DS_SYS_ID" \
        | $XPATH /DATASTORE/TEMPLATE/BRIDGE_LIST )

    if [ -n "$BRIDGE_LIST" ]; then
        SRC_HOST=$(get_destination_host)
    fi

    DUMP_CMD=$(cat <<EOF
        set -e -o pipefail
	$SUDO $LVCHANGE -ay $DST
        $SUDO ${DD} if=$DEV of=$DST bs=1M
        $SUDO $LVCHANGE -an $DEV > /dev/null 2>&1
	$SUDO $LVREMOVE -f $DEV > /dev/null 2>&1
EOF
)
else

    XPATH="${DRIVER_PATH}/../../datastore/xpath.rb --stdin"
    IFS= read -r -d '' BRIDGE_LIST < <(onedatastore show -x "$DS_SYS_ID" \
        | $XPATH /DATASTORE/TEMPLATE/BRIDGE_LIST )

    if [ -n "$BRIDGE_LIST" ]; then
        SRC_HOST=$(get_destination_host)
    fi

    DUMP_CMD=$(cat <<EOF
	set -e -o pipefail
	$SUDO $LVCHANGE -ay $DST

	# rbt: BREST-1720
	SIZES=\$(${SUDO} ${LVS} --nosuffix --noheadings --units B -o lv_path,lv_size $DST $DEV)
	SIZE_DEV=\$(echo "\${SIZES}" | ${AWK} '{if(\$1 == "${DEV}") {gsub(/ /,"", \$2); print \$2;}}')
	SIZE_DST=\$(echo "\${SIZES}" | ${AWK} '{if(\$1 == "${DST}") {gsub(/ /,"", \$2); print \$2;}}')
	[ -z "\${SIZE_DEV}" ] || [ -z "\${SIZE_DST}" ] || [ "x\${SIZE_DEV}" == "x\${SIZE_DST}" ] || {
    	    $SUDO $LVEXTEND -L\${SIZE_DEV}B ${DST}
	}

	$SUDO ${DD} if=$DEV of=$DST bs=1M
EOF
)
fi
#-------------------------------------------------------------------------------
# Move the image back to the datastore
#-------------------------------------------------------------------------------
log "Dumping $SRC to $DST"

ssh_exec_and_log "$SRC_HOST" "$DUMP_CMD" \
    "Error dumping $SRC to $DST"

exit 0
