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

###############################################################################
# This script is used to create a VM image (DST) 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 $0)
UTILS_PATH="${DRIVER_PATH}/.."

source ${DRIVER_PATH}/../libfs.sh
if [ -f ${DRIVER_PATH}/../../etc/datastore/datastore.conf ]; then
    source ${DRIVER_PATH}/../../etc/datastore/datastore.conf
fi
source ${DRIVER_PATH}/../../etc/datastore/linstor_un/linstor_un.conf
source ${DRIVER_PATH}/linstor_utils.sh

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

if [ -n "$2" ]; then
    DRV_ACTION=$1
    ID=$2
else
    DRV_ACTION=$(cat -)
    ID=$1
fi

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

unset i j 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/STAGING_DIR \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/LS_CONTROLLERS \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/LS_CERTFILE \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/LS_KEYFILE \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/LS_CAFILE \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/RESOURCE_GROUP \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/NODE_LIST \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/LAYER_LIST \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/REPLICAS_ON_SAME \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/REPLICAS_ON_DIFFERENT \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/AUTO_PLACE \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/REPLICA_COUNT \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/DO_NOT_PLACE_WITH \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/DO_NOT_PLACE_WITH_REGEX \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/STORAGE_POOL \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/DISKLESS_POOL \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/ENCRYPTION \
                    /DS_DRIVER_ACTION_DATA/IMAGE/FSTYPE \
                    /DS_DRIVER_ACTION_DATA/IMAGE/FORMAT \
                    /DS_DRIVER_ACTION_DATA/IMAGE/FS \
                    /DS_DRIVER_ACTION_DATA/IMAGE/SIZE)

BASE_PATH="${XPATH_ELEMENTS[j++]}"
RESTRICTED_DIRS="${XPATH_ELEMENTS[j++]}"
SAFE_DIRS="${XPATH_ELEMENTS[j++]}"
BRIDGE_LIST="${XPATH_ELEMENTS[j++]}"
STAGING_DIR="${XPATH_ELEMENTS[j++]:-$STAGING_DIR}"
LS_CONTROLLERS="${XPATH_ELEMENTS[j++]}"
LS_CERTFILE="${XPATH_ELEMENTS[j++]}"
LS_KEYFILE="${XPATH_ELEMENTS[j++]}"
LS_CAFILE="${XPATH_ELEMENTS[j++]}"
RESOURCE_GROUP="${XPATH_ELEMENTS[j++]}"
NODE_LIST="${XPATH_ELEMENTS[j++]}"
LAYER_LIST="${XPATH_ELEMENTS[j++]}"
REPLICAS_ON_SAME="${XPATH_ELEMENTS[j++]}"
REPLICAS_ON_DIFFERENT="${XPATH_ELEMENTS[j++]}"
AUTO_PLACE="${XPATH_ELEMENTS[j++]}"
REPLICA_COUNT="${XPATH_ELEMENTS[j++]:-$AUTO_PLACE}"
DO_NOT_PLACE_WITH="${XPATH_ELEMENTS[j++]}"
DO_NOT_PLACE_WITH_REGEX="${XPATH_ELEMENTS[j++]}"
STORAGE_POOL="${XPATH_ELEMENTS[j++]}"
DISKLESS_POOL="${XPATH_ELEMENTS[j++]:-DfltDisklessStorPool}"
ENCRYPTION="${XPATH_ELEMENTS[j++]}"
FSTYPE="${XPATH_ELEMENTS[j++]}"
FORMAT="${XPATH_ELEMENTS[j++]:-$FSTYPE}"
FS="${XPATH_ELEMENTS[j++]}"
SIZE="${XPATH_ELEMENTS[j++]}"

DST_HOST=`linstor_get_bridge_host "" "" $ID`

if [ -z "$DST_HOST" ]; then
    exit -1
fi
if [ -z "$RESOURCE_GROUP" ]; then
    if [ -z "$NODE_LIST" ] && [ -z "$REPLICA_COUNT" ]; then
        error_message "Datastore template missing 'RESOURCE_GROUP', 'NODE_LIST' or 'REPLICA_COUNT' attribute."
        exit -1
    fi
    if [ -z "$STORAGE_POOL" ]; then
        error_message "Datastore template missing 'STORAGE_POOL' attribute."
        exit -1
    fi
fi

linstor_load_keys

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

DST_RES="one-image-${ID}"
DST_DEV="/dev/drbd/by-res/${DST_RES}/0"
DST="$DST_DEV"

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

if [ "$FORMAT" = "save_as" ]; then
    echo "$DST"
    exit 0
fi

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

# Deploy new volume
linstor_exec_and_log \
    "resource-definition create $DST_RES $RD_CREATE_ARGS"
LINSTOR_CLEANUP_RD+=" $DST_RES"
linstor_exec_and_log \
    "volume-definition create $DST_RES ${SIZE}M $VOL_CREATE_ARGS"
if [ -n "$RESOURCE_GROUP" ]; then
    linstor_exec_and_log \
        "resource-definition auto-place $DST_RES $RD_AUTO_PLACE_ARGS"
else
    linstor_exec_and_log \
        "resource create $NODE_LIST $DST_RES $RES_CREATE_ARGS"
fi

if [ "$FORMAT" != "raw" ]; then

    # Attach diskless resource for DST_RES on DST_HOST
    if linstor_attach_diskless "$DST_HOST" "$DST_RES" "$DISKLESS_POOL"; then
        LINSTOR_CLEANUP_RES+=" $DST_HOST:$DST_RES"
    fi

    # Make new filesystem
    FS_OPTS=$(eval $(echo "echo \$FS_OPTS_$FS"))
    MKFS_CMD=`mkfs_command $DST_DEV $FORMAT $SIZE "$SUPPORTED_FS" "$FS" "$FS_OPTS"`
    ssh_exec_and_log "$DST_HOST" "$MKFS_CMD" \
        "Unable to create image with format $FORMAT in $DST_HOST:$DST_DEV"

fi
    
LINSTOR_CLEANUP_RD=
echo "$DST"
