#!/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.                                             #
#--------------------------------------------------------------------------- #

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

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
#-------------------------------------------------------------------------------
SRC_PATH=`arg_path $SRC`
SRC_PATH="../../${SRC_PATH##"$DS_DIR/"}"

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

#-------------------------------------------------------------------------------
# Link (ln) SRC into DST
#-------------------------------------------------------------------------------

# Is it a file or a folder (VMware)?
if [ -d `arg_path $SRC`  ]; then
	ssh_make_path $DST_HOST $DST_PATH

	# It's a folder, make links for all elements
    SRC_FOLDER_NAME=`basename $SRC_PATH`
    SRC_WITH_NO_FOLDER=`dirname $SRC_PATH`
    SRC_DS_NAME=`basename $SRC_WITH_NO_FOLDER`
	REL_SRC_PATH="../../../$SRC_DS_NAME/$SRC_FOLDER_NAME"

	log "Link all files in $SRC_PATH to $DST_PATH"

LINK_SCRIPT=$(cat <<EOF
for file in \$(cd $DST_DIR  ; find $SRC_PATH -type f); do
	FNAME=\$(basename \$file)
	(cd $DST_PATH ;  ln -sf $REL_SRC_PATH/\$FNAME $DST_PATH/$FNAME)
done
EOF
)
	ssh_exec_and_log $DST_HOST "$LINK_SCRIPT" "Could not link dir files from source DS to system DS"
else
	ssh_make_path $DST_HOST $DST_DIR

	# Just link a file
	log "Linking $SRC_PATH in $DST"

	ssh_exec_and_log $DST_HOST \
				     "cd $DST_DIR; ln -s $SRC_PATH $DST_PATH" \
	             	 "Error linking $SRC to $DST"
fi


exit 0

