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

# clone fe:SOURCE host:remote_system_ds/disk.i size 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

DRIVER_PATH=$(dirname $0)

 . $TMCOMMON

source ${DRIVER_PATH}/../../datastore/iscsi/iscsi.conf

#-------------------------------------------------------------------------------
# Set src, dst path and dir
#-------------------------------------------------------------------------------

TARGET=`arg_path $SRC`

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

#-------------------------------------------------------------------------------
# IQN and TARGETs
#-------------------------------------------------------------------------------

IQN=$SRC
NEW_IQN=$IQN-$VMID

VG_NAME=`echo $TARGET|$AWK -F. '{print $(NF-1)}'`
LV_NAME=`echo $TARGET|$AWK -F. '{print $(NF)}'`
SOURCE_DEV="/dev/$VG_NAME/$LV_NAME"

TARGET_LV_NAME=`echo $LV_NAME-$VMID`
TARGET_DEV="/dev/${VG_NAME}/${TARGET_LV_NAME}"
TARGET_HOST="${TARGET%.$VG_NAME.$LV_NAME}"

#-------------------------------------------------------------------------------
# Clone script
#-------------------------------------------------------------------------------

CLONE_CMD=$(cat <<EOF
    set -e

    # get size
    SIZE=\$($SUDO $LVS --noheadings -o lv_size "$SOURCE_DEV")

    # create lv
    $SUDO $LVCREATE -L\${SIZE} ${VG_NAME} -n ${TARGET_LV_NAME}

    # clone lv with dd
    $SUDO $DD if=$SOURCE_DEV of=$TARGET_DEV bs=64k

    # new iscsi target
    TID=\$($SUDO $(tgtadm_next_tid))

    $SUDO $(tgtadm_target_new "\$TID" "$NEW_IQN")
    $SUDO $(tgtadm_target_bind_all "\$TID")
    $SUDO $(tgtadm_logicalunit_new "\$TID" "$TARGET_DEV")
    $SUDO $(tgt_admin_dump_config "$TARGET_CONF")
EOF
)

ssh_exec_and_log "$TARGET_HOST" "$CLONE_CMD" \
        "Error cloning $DST_HOST:$TARGET_DEV"

DISCOVERY_CMD=$(cat <<EOF
    set -e
    mkdir -p $DST_DIR
    $SUDO $(iscsiadm_discovery "$TARGET_HOST")
    $SUDO $(iscsiadm_login "$NEW_IQN" "$TARGET_HOST")
    sleep 2
    DISK_BY_PATH=\$(ls /dev/disk/by-path/*$NEW_IQN-lun-1)
    ln -s "\$DISK_BY_PATH" "$DST_PATH"
EOF
)

ssh_exec_and_log "$DST_HOST" "$DISCOVERY_CMD" \
        "Error discovering $NEW_IQN in $DST_HOST"

exit 0
