#! /bin/sh
set -e

# grub-mkconfig helper script.
# Copyright (C) 2011  Michal Ambroz <rebus@seznam.cz>
#
# 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.
#
# 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 the script.  If not, see <http://www.gnu.org/licenses/>.

prefix=/usr
exec_prefix=/usr
bindir=/usr/bin
grublibdir=/usr/share/grub
. ${grublibdir}/grub-mkconfig_lib

export TEXTDOMAIN=grub
export TEXTDOMAINDIR=${prefix}/share/locale

CLASS=""

if [ "x${GRUB_DISTRIBUTOR}" = "x" ] ; then
  OS=Memtest
else
  OS="${GRUB_DISTRIBUTOR} Memtest"
fi

CONF_FILE="/etc/memtest86+.conf"
CONF_ELF_VAR="INSTALL_ELF"

MEMTEST86_ELF=`[ -r "$CONF_FILE" ] && sed -n "/^\s*${CONF_ELF_VAR}\s*=/ {s/^\s*${CONF_ELF_VAR}\s*=\s*\(.*\)$/\1/; T end; s/\s*\(\S\)*\s*/\1/; p; :end}" "$CONF_FILE" 2>/dev/null`
if [ "x${MEMTEST86_ELF}" = "x" ] || [ "x${MEMTEST86_ELF}" = "x1" ] || [ "x${MEMTEST86_ELF}" = "xtrue" ]; then
  MEMTEST86_ELF=1
  BANNER_SUFFIX=
  IMAGE="elf-memtest"
else
  MEMTEST86_ELF=0
  IMAGE="memtest"
  BANNER_SUFFIX=" (non-ELF)"
fi

# loop-AES arranges things so that /dev/loop/X can be our root device, but
# the initrds that Linux uses don't like that.
case ${GRUB_DEVICE} in
  /dev/loop/*|/dev/loop[0-9])
    GRUB_DEVICE=`losetup ${GRUB_DEVICE} | sed -e "s/^[^(]*(\([^)]\+\)).*/\1/"`
  ;;
esac

if [ "x${GRUB_DEVICE_UUID}" = "x" ] || [ "x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ] \
    || ! test -e "/dev/disk/by-uuid/${GRUB_DEVICE_UUID}" \
    || uses_abstraction "${GRUB_DEVICE}" lvm; then
  LINUX_ROOT_DEVICE=${GRUB_DEVICE}
else
  LINUX_ROOT_DEVICE=UUID=${GRUB_DEVICE_UUID}
fi

if [ "x`${grub_probe} --device ${GRUB_DEVICE} --target=fs 2>/dev/null || true`" = xbtrfs ]; then
  rootsubvol="`make_system_path_relative_to_its_root /`"
  rootsubvol="${rootsubvol#/}"
  if [ "x${rootsubvol}" != x ]; then
    GRUB_CMDLINE_LINUX="rootflags=subvol=${rootsubvol} ${GRUB_CMDLINE_LINUX}"
  fi
fi

memtest_entry ()
{
  os="$1"
  version="$2"
  recovery="$3"
  args="$4"
  title="$(gettext_quoted "%s %s")"
  printf "menuentry '${title}${BANNER_SUFFIX}' {\n" "${os}" "${version}"


  if [ x$dirname = x/ ]; then
    if [ -z "${prepare_root_cache}" ]; then
      prepare_root_cache="$(prepare_grub_to_access_device ${GRUB_DEVICE} | sed -e "s/^/\t/")"
    fi
    printf '%s\n' "${prepare_root_cache}"
  else
    if [ -z "${prepare_boot_cache}" ]; then
      prepare_boot_cache="$(prepare_grub_to_access_device ${GRUB_DEVICE_BOOT} | sed -e "s/^/\t/")"
    fi
    printf '%s\n' "${prepare_boot_cache}"
  fi
  message="$(gettext_printf "Loading %s %s ..." "${os}" "${version}")"
  if [ "x${MEMTEST86_ELF}" = "x1" ]; then
    cat << EOF
	insmod bsd
	echo	'$message'
	knetbsd	${rel_dirname}/${basename}
}
EOF
  else
    cat << EOF
	echo	'$message'
	linux16	${rel_dirname}/${basename}
}
EOF
  fi
}

case x`uname -m` in
    xi?86 | xx86_64)
	list=`for i in /boot/${IMAGE}* ; do
                  if grub_file_is_not_garbage "$i" ; then echo -n "$i " ; fi
              done` ;;
    *) 
	list=`for i in /boot/${IMAGE}* ; do
                  if grub_file_is_not_garbage "$i" ; then echo -n "$i " ; fi
	     done` ;;
esac

prepare_boot_cache=
prepare_root_cache=

while [ "x$list" != "x" ] ; do
  linux=`version_find_latest $list`
  echo "Found memtest image: $linux" >&2
  basename=`basename $linux`
  dirname=`dirname $linux`
  rel_dirname=`make_system_path_relative_to_its_root $dirname`
  version=`echo $basename | sed -e "s,^[^0-9]*-,,g"`
  alt_version=`echo $version | sed -e "s,\.old$,,g"`
  linux_root_device_thisversion="${LINUX_ROOT_DEVICE}"


  memtest_entry "${OS}" "${version}" false \
      "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}"

  list=`echo $list | tr ' ' '\n' | grep -vx $linux | tr '\n' ' '`
done