#!/bin/bash

#rbt

# mkimage size format host:remote_system_ds/disk.i vmid dsid
#   - size in MB of the image
#   - format for the image
#   - 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
VM_ID=$4

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 $LIB_LOCATION/sh/scripts_common.sh
source ${DRIVER_PATH}/../../datastore/libfs.sh
source ${DRIVER_PATH}/../../etc/tm/fs_lvm/fs_lvm.conf
source ${DRIVER_PATH}/../../etc/datastore/datastore.conf

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

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

DS_SYS_ID=$(basename $(dirname $DST_DIR))
DST_DS_PATH="$(dirname $(dirname $(dirname $DST_PATH)))"
DISK_ID=$(basename ${DST_PATH} | cut -d. -f2)

#-------------------------------------------------------------------------------
#  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 $VM_ID | $XPATH  \
                            /VM/TEMPLATE/DISK[DISK_ID=$DISK_ID]/FS)

FS="${XPATH_ELEMENTS[j++]}"

#-------------------------------------------------------------------------------
# Create the logical volume and link it
#-------------------------------------------------------------------------------

LV_NAME="lv-one-vm-$VM_ID-$DISK_ID"
VG_NAME="vg-one-$DS_SYS_ID"
DEV="/dev/${VG_NAME}/${LV_NAME}"

# QEMU format
if [ "$FORMAT" = "qcow2" ]; then
    $SUDO $LVCREATE --wipesignatures n -L 1G -n $LV_NAME ${VG_NAME}
    ${QEMU_IMG} create -f qcow2 ${DEV} ${SIZE}M
    $SUDO lvchange -an $DEV
else
    log_error "QCOW2 format only"
    error_message "QCOW2 format only"
    exit -1
fi

MKIMAGE_CMD=$(cat <<EOF
    set -e -o pipefail
    export PATH=/usr/sbin:/sbin:\$PATH
    mkdir -p $DST_DIR
    [ "$FORMAT" = "swap" ] && mkswap ${DEV}
    rm -f "$DST_PATH"
    ln -s "$DEV" "$DST_PATH"

EOF
)

ssh_exec_and_log "$DST_HOST" "$MKIMAGE_CMD" \
        "Could not create image $DST_PATH"
exit 0
