#!/bin/sh

# SPDX-FileCopyrightText: 2023 - 2024 Benjamin Grande M. S. <ben.grande.b@gmail.com>
#
# SPDX-License-Identifier: AGPL-3.0-or-later

set -eu

list_backups(){
  ## Hide stderr to hide remote login connection messages (banners etc).
  # shellcheck disable=SC2086
  ${qrun_cmd} "${qube}" -- "${cmd} ${find_cmd} 2>/dev/null"
}

list_last_backup(){
  list_backups | tail -1
}

usage(){
  printf '%s\n' "Usage: ${0##*/} QUBE DIR [CMD]
example: ${0##*/} usb-qube /local/dir/backups
example: ${0##*/} ssh-qube /remote/dir/backups 'ssh user@server'
note: when using a remote login command (ssh), DIR is the remote directory
note: the directory specified must be the parent of the saved backups"
  exit 1
}

if test -z "${2-}"; then
  usage
fi

qube="${1}"
path="${2}"
cmd="${3-}"

find_pattern="qubes-backup-*"
find_cmd="find \"${path}\" -maxdepth 1 -type f -name \"${find_pattern}\""
qrun_cmd="qvm-run --filter-escape-chars --no-color-output --no-color-stderr --pass-io"

last_backup="$(list_last_backup)"
if test -z "${last_backup}"; then
  exit 1
fi

echo "${last_backup}"