/useful/trunk-1

#!/usr/bin/env bash

####

# FILE NAME do-offline-updates.sh

#

####

__UPDATES_AVAILABLE=false

__DO_REBOOT=true

__DO_DOWNLOAD=true

__REBOOT_COMMAND="systemctl reboot"

__SANITY=true

__SCRIPT_ROOT=$(dirname $(readlink -f $0))

source $__SCRIPT_ROOT/useful.inc.sh

function __usage () {

  echo "    do-offline-updates.sh"

  echo "Perform offline updates, if available."

  echo ""

  echo "--help           -h"

  echo "    Show this help message."

  echo ""

  echo "--no-reboot"

  echo "    Do not perform an reboot."

  echo ""

  echo "--no-download    --check-updates"

  echo "    Do not download updates."

  echo "    Will show if updates are available."

  echo "    Implies --no-reboot."

  echo ""

}

function __sanity_check () {

  # Check that we have the tools needed.

  __find_tool systemctl

  __find_tool pkcon

  if [[ $__SANITY == false ]]; then

    echo ""

    echo "Please install the missing tools."

    echo ""

    exit 1

  fi

} 

function __check_for_updates () {

  __silentpkcon get-updates

  if [[ $? == 0 ]]; then

    echo "Updates are available!"

    echo ""

    __UPDATES_AVAILABLE=true

  else

    __UPDATES_AVAILABLE=false

  fi

}

function __download_updates () {

  pkgcon update --download-only

  if [[ $? == 0 ]];then

    __UPDATES_AVAILABLE=true

  else

    ## huh?

    __UPDATES_AVAILABLE=false

  fi

}

function __reboot () {

  eval __REBOOT_COMMAND

}

function __parse_args () {

  if [[ -z "$1" ]]

  then

    echo "Try --help or -h."

    exit 1

  fi

  while [[ $# -gt 0 ]]

  do

    case $1 in

      -h|--help)

         __usage

         exit

         shift

      ;;

      --no-reboot)

        __DO_REBOOT=false

        shift

        ;;

      --no-download|--check-updates)

        __DO_REBOOT=false

        __DO_DOWNLOAD=false

        shift

        ;;

      *)

        echo "Unkown argument \"${1}\"."

        exit 1

        shift

      ;;

      --)

        shift

        break

      ;;

    esac

  done

}

function __main () {

  __satity_check

  __parse_args $@

  if [[ ( __DO_DOWNLOAD == true ) && ( __UPDATE_AVAILABLE == true ) ]]; then

    __do_download

  fi

  if [[ ( __DO_REBOOT == true ) && ( __UPDATE_AVAILABLE == true ) ]]; then

    __do_reboot

  fi

}

__main $@