#!/bin/bash

# -------------------------------------------------------------------------- #
# Copyright 2002-2019, 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 vmid dsid
#   - 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
#   - vmid is the id of the VM
#   - dsid is the target datastore (0 is the system datastore)
# Nothing to do
SRC=$1
DST=$2
VM_ID=$3
DS_ID=$4


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

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

DRIVER_PATH=$(dirname $0)

source $TMCOMMON
source ${DRIVER_PATH}/../../datastore/libfs.sh
source ${DRIVER_PATH}/../../efs_utils

efs_log_var "SRC"
efs_log_var "DST"
efs_log_var "VM_ID"
efs_log_var "DS_ID"

#error_message "TM:MV stub"
#exit 0

# Get Image ID
IMG_ID=`arg_path $DST`
#-------------------------------------------------------------------------------
# Get SRC Datastore information
#-------------------------------------------------------------------------------
XPATH="${DRIVER_PATH}/../../datastore/xpath.rb --stdin"
unset i j XPATH_ELEMENTS

while IFS= read -r -d '' element; do
        XPATH_ELEMENTS[i++]="$element"
done < <(onedatastore show -x $DS_ID | $XPATH \
                    /DATASTORE/TEMPLATE/BRIDGE_LIST\
                    /DATASTORE/TEMPLATE/POOL_NAME)

BRIDGE_LIST="${XPATH_ELEMENTS[j++]}"
POOL_NAME="${XPATH_ELEMENTS[j++]}"

#-----------
efs_log_var "BRIDGE_LIST"
efs_log_var "POOL_NAME"

# get_destination_host returns a host out of the BRIDGE_LIST
# So we need to change BRIDGE_LIST global variable for source and destination
DST_HOST=`get_destination_host $DS_ID`

SNAPTS=`date +"%Y-%m-%d_%H%M%S"`
MVDS_CMD=$(cat <<EOF
    sudo zfs snapshot ${POOL_NAME}/one/${IMG_ID}@${SNAPTS}
    sudo zfs set one:current=${SNAPTS} ${POOL_NAME}/one/${IMG_ID}
EOF
)

efs_log_var "MVDS_CMD"

ssh_exec_and_log $DST_HOST "${MVDS_CMD}" \
                 "Error save latest state ${SNAPDS} on $DST_HOST:${POOL_NAME}/one/${IMG_ID}"

exit 0

# zfs snapshot POOL_NAME/one/IMG_ID
# zfs set one:current=snapshot
