ova-to-qcow2

#!/bin/bash

# SPDX-FileCopyrightText: 2024 sudorook <daemon@nullcodon.com>
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <https://www.gnu.org/licenses/>.

set -Eeuo pipefail

ROOT="$(dirname "${0}")"

source "${ROOT}"/globals

! check_command tar qemu-img && exit 3

function print_usage() {
  show_header "Usage: ova-to-qcow2"
  cat << EOF
  -h|--help   print (this) help message
EOF
}

OPTIONS=h
LONGOPTIONS=help
PARSED=$(getopt -o "${OPTIONS}" --long "${LONGOPTIONS}" -n "${0}" -- "${@}")
eval set -- "${PARSED}"

while [ ${#} -ge 1 ]; do
  case "${1}" in
    -h | --help)
      print_usage
      exit
      ;;
    --)
      shift
      break
      ;;
    *)
      show_error "ERROR"
      exit 3
      ;;
  esac
done

TMP="$(mktemp -d)"
trap 'rm -rf "${TMP}"' INT TERM EXIT ERR

if ! [ $# -eq 1 ]; then
  show_error "ERROR: Incorrect # of inputs. Exiting."
  exit 3
fi
if ! [ -f "${1}" ]; then
  show_error "ERROR: Input ${1@Q} does not exist. Exiting."
  exit 3
fi

IN="${1}"
NAME="${IN%.*}"
EXT="${IN##*.}"

if ! [[ "${EXT,,}" = ova ]]; then
  show_error "ERROR: Not an OVA file. Exiting."
  exit 3
fi

tar -xvf "${IN}" -C "${TMP}"
pushd "${TMP}" > /dev/null
if [ -f "${NAME}.vmdk" ]; then
  qemu-img convert -f vmdk -O qcow2 "${NAME}.vmdk" "${NAME}.qcow2"
elif [ -f "${NAME}.vdi" ]; then
  qemu-img convert -f vdi -O qcow2 "${NAME}.vdi" "${NAME}.qcow2"
else
  show_error "ERROR: No compatible image extracted. Exiting."
fi
popd > /dev/null

if [ -f "${TMP}/${NAME}.qcow2" ]; then
  mv -v "${TMP}/${NAME}.qcow2" .
fi