#!/bin/bash

# Vitastor OpenNebula driver
# Copyright (c) Vitaliy Filippov, 2024+
# License: Apache-2.0 http://www.apache.org/licenses/LICENSE-2.0

# mkimage size format host:remote_system_ds/disk.i vmid dsid
#   - size in MB of the image
#   - format for the image
#   - 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)

SIZE=$1
FORMAT=$2
DST=$3

VMID=$4
DSID=$5

#-------------------------------------------------------------------------------

if [ -z "${ONE_LOCATION}" ]; then
    TMCOMMON=/var/lib/one/remotes/tm/tm_common.sh
    LIB_LOCATION=/usr/lib/one
else
    TMCOMMON=$ONE_LOCATION/var/remotes/tm/tm_common.sh
    LIB_LOCATION=$ONE_LOCATION/lib
fi

DRIVER_PATH=$(dirname $0)

source $TMCOMMON

source ${DRIVER_PATH}/../../etc/datastore/datastore.conf
source ${DRIVER_PATH}/../../datastore/libfs.sh

#-------------------------------------------------------------------------------
# Set dst path and dir
#-------------------------------------------------------------------------------

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

DISK_ID=$(echo $DST|awk -F. '{print $NF}')

#-------------------------------------------------------------------------------
# Get Image information
#-------------------------------------------------------------------------------

XPATH="${DRIVER_PATH}/../../datastore/xpath.rb --stdin"

unset i j XPATH_ELEMENTS

while IFS= read -r -d '' element; do
    XPATH_ELEMENTS[i++]="$element"
done < <(onevm show -x $VMID | $XPATH \
    /VM/TEMPLATE/DISK[DISK_ID=$DISK_ID]/VITASTOR_CONF \
    /VM/TEMPLATE/DISK[DISK_ID=$DISK_ID]/POOL_NAME \
    /VM/TEMPLATE/DISK[DISK_ID=$DISK_ID]/IMAGE_PREFIX \
    /VM/TEMPLATE/DISK[DISK_ID=$DISK_ID]/FS)

VITASTOR_CONF="${XPATH_ELEMENTS[j++]}"
POOL_NAME="${XPATH_ELEMENTS[j++]}"
IMAGE_PREFIX="${XPATH_ELEMENTS[j++]:-one}"
FS="${XPATH_ELEMENTS[j++]}"

CLI=
QEMU_ARG=""
if [ -n "$VITASTOR_CONF" ]; then
    CLI="$CLI --config_path ${VITASTOR_CONF}"
    QEMU_ARG=":config_path=${VITASTOR_CONF}"
fi

IMAGE_NAME="${IMAGE_PREFIX}-sys-${VMID}-${DISK_ID}"

ssh_make_path $DST_HOST $DST_DIR

set -e -o pipefail

# if user requested a swap or specifies a FS, we need to create a local
# formatted image and upload into existing Vitastor image
FS_OPTS=$(eval $(echo "echo \$FS_OPTS_$FS"))

MKIMAGE_CMD=$(cat <<EOF
    set -e -o pipefail
    export PATH=/usr/sbin:/sbin:\$PATH
    vitastor-cli $CLI create --pool "${POOL_NAME}" "$IMAGE_NAME" --size "${SIZE}M"
EOF
)

if [ -n "$FS" -o "$FORMAT" = "swap" ]; then
    MKFS_CMD=`mkfs_command '$NBD' raw "$SIZE" "$SUPPORTED_FS" "$FS" "$FS_OPTS" | grep -v $QEMU_IMG`
    MKIMAGE_CMD=$(cat <<EOF
    $MKIMAGE_CMD
    NBD=\$(sudo vitastor-nbd $CLI map --image "$IMAGE_NAME")
    trap "sudo vitastor-nbd $CLI unmap \$NBD" EXIT
    $MKFS_CMD
EOF
)
fi

DELIMAGE_CMD=$(cat <<EOF
    vitastor-cli $CLI rm "$IMAGE_NAME"
EOF
)

log "Making volatile disk of ${SIZE}M at $DST"

ssh_exec_and_log_no_error "$DST_HOST" "$MKIMAGE_CMD" "Error creating volatile disk.$DISK_ID ($IMAGE_NAME) in $DST_HOST in pool $POOL_NAME."

rc=$?

if [ $rc != 0 ]; then
    ssh_exec_and_log_no_error "$DST_HOST" "$DELIMAGE_CMD" "Error removing image"
fi

exit $rc