#!/bin/bash

# -------------------------------------------------------------------------- #
# Copyright 2002-2015, OpenNebula Project (OpenNebula.org), C12G Labs        #
#                                                                            #
# 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.                                             #
#--------------------------------------------------------------------------- #

###############################################################################
# This script is used to create a VM image (SRC) of size (SIZE) and formatted
# as (FS)
###############################################################################

# -------- Set up the environment to source common tools & conf ------------

if [ -z "${ONE_LOCATION}" ]; then
    LIB_LOCATION=/usr/lib/one
else
    LIB_LOCATION=$ONE_LOCATION/lib
fi

. $LIB_LOCATION/sh/scripts_common.sh

DRIVER_PATH=$(dirname $0)
source ${DRIVER_PATH}/../libfs.sh
source ${DRIVER_PATH}/ceph.conf

# -------- Get mkfs and datastore arguments from OpenNebula core ------------

DRV_ACTION=$1
ID=$2

XPATH="${DRIVER_PATH}/../xpath.rb -b $DRV_ACTION"

unset i XPATH_ELEMENTS

while IFS= read -r -d '' element; do
    XPATH_ELEMENTS[i++]="$element"
done < <($XPATH     /DS_DRIVER_ACTION_DATA/DATASTORE/BASE_PATH \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/RESTRICTED_DIRS \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/SAFE_DIRS \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/BRIDGE_LIST \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/POOL_NAME \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/STAGING_DIR \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/RBD_FORMAT \
                    /DS_DRIVER_ACTION_DATA/IMAGE/FSTYPE \
                    /DS_DRIVER_ACTION_DATA/IMAGE/SIZE \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/CEPH_USER)

unset i

BASE_PATH="${XPATH_ELEMENTS[i++]}"
RESTRICTED_DIRS="${XPATH_ELEMENTS[i++]}"
SAFE_DIRS="${XPATH_ELEMENTS[i++]}"
BRIDGE_LIST="${XPATH_ELEMENTS[i++]}"
POOL_NAME="${XPATH_ELEMENTS[i++]:-$POOL_NAME}"
STAGING_DIR="${XPATH_ELEMENTS[i++]:-$STAGING_DIR}"
RBD_FORMAT="${XPATH_ELEMENTS[i++]:-$RBD_FORMAT}"
FSTYPE="${XPATH_ELEMENTS[i++]}"
SIZE="${XPATH_ELEMENTS[i++]}"
CEPH_USER="${XPATH_ELEMENTS[i++]}"

DST_HOST=`get_destination_host $ID`

if [ -z "$DST_HOST" ]; then
    error_message "Datastore template missing 'BRIDGE_LIST' attribute."
    exit -1
fi

if [ -n "$CEPH_USER" ]; then
    RBD="$RBD --id ${CEPH_USER}"
fi

set_up_datastore "$BASE_PATH" "$RESTRICTED_DIRS" "$SAFE_DIRS"

IMAGE_HASH=`generate_image_hash`
TMP_DST="$STAGING_DIR/$IMAGE_HASH"

IMAGE_NAME="one-${ID}"
RBD_SOURCE="${POOL_NAME}/${IMAGE_NAME}"

# ------------ Image to save_as disk, no need to create a FS ------------

if [ "$FSTYPE" = "save_as" ]; then
    echo "$RBD_SOURCE"
    exit 0
fi

# ------------ Create the image in the repository ------------

MKFS_CMD=`mkfs_command $TMP_DST $FSTYPE $SIZE`

if [ "$RBD_FORMAT" = "2" ]; then
    FORMAT_OPT="--image-format 2"
fi

REGISTER_CMD=$(cat <<EOF
    set -e
    export PATH=/usr/sbin:/sbin:\$PATH

    if [ "$FSTYPE" = "raw" ]; then
        $RBD create $FORMAT_OPT $RBD_SOURCE --size ${SIZE}
    else
        # create and format
        $DD if=/dev/zero of=$TMP_DST bs=1 count=1 seek=${SIZE}M
        $MKFS_CMD

        # create rbd
        $RBD import $FORMAT_OPT $TMP_DST $RBD_SOURCE

        # remove original
        $RM -f $TMP_DST
    fi
EOF
)

ssh_exec_and_log "$DST_HOST" "$REGISTER_CMD" \
    "Error registering $RBD_SOURCE in $DST_HOST"

echo "$RBD_SOURCE"
