ln

#!/bin/bash

# -------------------------------------------------------------------------- #
# Copyright 2002-2021, 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.                                             #
#--------------------------------------------------------------------------- #

# ln fe:SOURCE host:remote_system_ds/disk.i 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)

SRC=$1
DST=$2

VMID=$3
DSID=$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

. $TMCOMMON

#-------------------------------------------------------------------------------
# Set dst path and dir
#-------------------------------------------------------------------------------
DST_PATH=`arg_path $DST`
DST_HOST=`arg_host $DST`
DST_DIR=`dirname $DST_PATH`

SRC_ARG_PATH=`arg_path $SRC`

DST_DS_PATH="$(dirname $(dirname $(dirname $DST_PATH)))"
SRC_DS_PATH="$(dirname $(dirname $SRC_ARG_PATH))"

SRC_PATH="${DST_DS_PATH}${SRC_ARG_PATH##$SRC_DS_PATH}"

#-------------------------------------------------------------------------------
# Create DST path
#-------------------------------------------------------------------------------

ssh_make_path $DST_HOST $DST_DIR

#-------------------------------------------------------------------------------
# Link (ln) SRC into DST
#-------------------------------------------------------------------------------
log "Linking $SRC_PATH in $DST"

LN_CMD=$(cat <<EOF
    set -ex -o pipefail

    cd ${DST_DIR}
    rm -f ${DST_PATH}

    ln -s "${SRC_PATH}" "${DST_PATH}"
EOF
)

ssh_exec_and_log "${DST_HOST}" \
    "${LN_CMD}" \
    "Error linking ${SRC} to ${DST}"

exit 0