#!/bin/bash

DIR=/usr/share/virtualbox/extensions
TMP_DIR=/tmp/Oracle_VM_VirtualBox_Extension_Pack

virtualbox-ext-oracle-installer() {
  [ -d $TMP_DIR ] && rm -rf $TMP_DIR
  mkdir $TMP_DIR
  cd $TMP_DIR
  wget "https://www.virtualbox.org/download/hashes/$1/SHA256SUMS" -O SHA256SUMS
  EXTPACK_FILE="Oracle_VM_VirtualBox_Extension_Pack-${1}.vbox-extpack"

  if sha256sum -c SHA256SUMS > /dev/null 2>&1
  then
          echo "nothing to do, you are already using the latest VirtualBox Extension provided by Oracle"
  else
          SRC_URL="http://download.virtualbox.org/virtualbox/${1}/${EXTPACK_FILE}"
          wget "$SRC_URL" -O "${EXTPACK_FILE}"
          cp -f "${EXTPACK_FILE}" $DIR/
  fi
}

# arg 1:  the new package version
post_install() {
  virtualbox-ext-oracle-installer "${1%%-*}"
  VBoxManage extpack install "${DIR}/Oracle_VM_VirtualBox_Extension_Pack-${1%%-*}.vbox-extpack" >/dev/null
}

# arg 1:  the new package version
# arg 2:  the old package version
pre_upgrade() {
  pre_remove "$2"
}

# arg 1:  the new package version
# arg 2:  the old package version
post_upgrade() {
  post_install "$1"
}

# arg 1:  the old package version
pre_remove() {
  VBoxManage extpack uninstall "Oracle VM VirtualBox Extension Pack" >/dev/null
  rm -rf ${DIR}/Oracle_VM_VirtualBox_Extension_Pack-${1%%-*}.vbox-extpack >/dev/null
}

# vim:set ts=2 sw=2 ft=sh et: