#!/bin/sh
# preinst script for grub-loopback-iso

set -e

remove_old_grubd() {
  # Old grml-rescueboot 42_grml is saved upon upgrade as a conffile.
  # Remove it if it matches known default hashes; otherwise warn.
  [ -e /etc/grub.d/42_grml ] || return

  default_grubd=""
  case "$(md5sum /etc/grub.d/42_grml | cut -d' ' -f1)" in
    1db35de0d6dddb149bd609689ef98b30) # 0.4.2
      default_grubd=yes
      ;;
    c1afca4d42c494a7421c27ad9fb731fd) # 0.4.4
      default_grubd=yes
      ;;
    ecc549965cc4b4d0d762a3ba6dfe7cb5) # 0.4.5
      default_grubd=yes
      ;;
  esac

  if [ -n "$default_grubd" ]; then
    rm -f /etc/grub.d/42_grml
    return
  else
    echo >&2
    echo "WARNING: /etc/grub.d/42_grml appears to have been modified." >&2
    echo "Please remove it and/or purge the transitional grml-rescueboot package." >&2
    echo >&2
  fi
}

case "$1" in
  install|upgrade)
    remove_old_grubd
    ;;
esac

#DEBHELPER#

exit 0