#!/usr/bin/env bash
# Nc-update performs automated NextCloud update
# Copyright (C) 2018  Aaron Ball <nullspoon@oper.io>
# 
# 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/>.

NC_DL_BASE=https://download.nextcloud.com/server/releases

cp_custom_apps() {
  local old=${1}
  local new=${2}

  local oldabs # Absolute path to the old instance
  local newabs # Absolute path to the new instance

  newabs="$(cd ${new} && pwd)"
  oldabs="$(cd ${old} && pwd)"

  for app in $(ls -1 ${old}/apps); do
    # Sanitize the app path
    app="$(basename ${app})"

    if [ ! -e "${new}/apps/${app}" ]; then
      printf "Copying custom app %s\n" "${app}"
      cp -r "${old}/apps/${app}" "${new}/apps/"
    fi
  done
}

main() {
  local path="${1}"
  local version="${2}"

  if [ -z "${path:-}" ]; then
    printf "Path to nextcloud instant to upgrade is required.\n"
    return 1
  fi
  if [ -z "${version:-}" ]; then
    printf "Nextcloud version to upgrade to is required.\n"
    return 1
  fi

  tmp=$(mktemp -d /tmp/nc-update.XXXXXXX)

  printf "Downloading update package version %s\n" "${version}"
  curl -L -# \
    -o ${tmp}/nc-${version}.tar.bz2 \
    ${NC_DL_BASE}/nextcloud-${version}.tar.bz2

  printf "Extracting update package for version %s\n" "${version}"
  tar -x -C "${tmp}" -f "${tmp}/nc-${version}.tar.bz2"

  local oldinst="$(dirname ${path})/$(basename ${path}).$(date '+%F')"
  mv "${path}" "${oldinst}"

  mv "${tmp}/nextcloud" "${path}"

  printf "Copying configs from the old instance\n"
  cp ${oldinst}/config/config.php ${path}/config/config.php

  printf "Copying custom apps from the old instance\n"
  cp_custom_apps "${oldinst}" "${path}"

  printf "Upgrading instance\n"
  php ${path}/occ upgrade

  printf "Compressing old version for backup purposes\n"
  cd "$(dirname ${oldinst})"
  tar -c $(basename ${oldinst}) | xz -cv > $(basename ${oldinst}).tar.xz
  rm -rf "$(basename ${oldinst})"

  printf "Cleaning up upgrade resource\n"
  rm -rf "${tmp}"

  printf "\nYour owncloud instance at %s is upgraded to %s\n" \
    "${path}" "${version}"
  printf "The old version is archived at %s\n" "${oldinst}.tar.xz"
}

main ${@}