#!/bin/sh
set -e

if [ -f /usr/lib/grub/grub-mkconfig_lib ]; then
  . /usr/lib/grub/grub-mkconfig_lib
  LX=linux16
elif [ -f /usr/lib/grub/update-grub_lib ]; then
  . /usr/lib/grub/update-grub_lib
  LX=linux
else
  # no grub file, so we notify and exit gracefully
  echo "Cannot find grub config file, exiting." >&2
  exit 0
fi

# We need 16-bit boot, which isn't available on EFI.
if [ -d /sys/firmware/efi ]; then
  echo "Memtest86+ needs a 16-bit boot, that is not available on EFI, exiting" >&2
  exit 0
fi

if [ -f /etc/default/grub ]; then
  GRUB_DISABLE_MEMTEST=`sed -n 's/^GRUB_DISABLE_MEMTEST=\(.*\)/\1/p' < /etc/default/grub`
  GRUB_MEMTEST_DISABLE_SERIAL=`sed -n 's/^GRUB_MEMTEST_DISABLE_SERIAL=\(.*\)/\1/p' < /etc/default/grub`
  GRUB_MEMTEST_ENABLE_MULTIBOOT=`sed -n 's/^GRUB_MEMTEST_ENABLE_MULTIBOOT=\(.*\)/\1/p' < /etc/default/grub`
  GRUB_MEMTEST_SERIAL_PARAMS=`sed -n 's/^GRUB_MEMTEST_SERIAL_PARAMS=\(.*\)/\1/p' < /etc/default/grub`
fi

if [ "x${GRUB_MEMTEST_SERIAL_PARAMS}" = "x" ] ; then
  GRUB_MEMTEST_SERIAL_PARAMS="ttyS0,115200n8"
fi

# With GRUB_DISABLE_MEMTEST=true don't add memtest entries
if [ "x${GRUB_DISABLE_MEMTEST}" = "xtrue" ] ; then
  exit 0
fi

# We can't cope with loop-mounted devices here.
case ${GRUB_DEVICE_BOOT} in
  /dev/loop/*|/dev/loop[0-9]) exit 0 ;;
esac

export TEXTDOMAIN=memtest86+

prepare_boot_cache="$(prepare_grub_to_access_device ${GRUB_DEVICE_BOOT} | sed -e "s/^/\t/")"

if test -e /boot/memtest86+.elf ; then
  MEMTESTPATH=$( make_system_path_relative_to_its_root "/boot/memtest86+.elf" )
  echo "Found memtest86+ image: $MEMTESTPATH" >&2
  cat << EOF
menuentry '$(gettext_printf "Memory test (memtest86+.elf)")' {
EOF
  printf '%s\n' "${prepare_boot_cache}"
  cat << EOF
	knetbsd	$MEMTESTPATH
}
EOF
fi

if [ "x${GRUB_MEMTEST_DISABLE_SERIAL}" != "xtrue" -a -e /boot/memtest86+.bin ]; then
  MEMTESTPATH=$( make_system_path_relative_to_its_root "/boot/memtest86+.bin" )
  echo "Found memtest86+ image: $MEMTESTPATH" >&2
  cat << EOF
menuentry '$(gettext_printf "Memory test (memtest86+.bin, serial console)")' {
EOF
  printf '%s\n' "${prepare_boot_cache}"
  cat << EOF
	$LX	$MEMTESTPATH console=${GRUB_MEMTEST_SERIAL_PARAMS}
}
EOF
fi

if [ "x${GRUB_MEMTEST_ENABLE_MULTIBOOT}" = "xtrue" -a -e /boot/memtest86+_multiboot.bin ]; then
  MEMTESTPATH=$( make_system_path_relative_to_its_root "/boot/memtest86+_multiboot.bin" )
  echo "Found memtest86+ multiboot image: $MEMTESTPATH" >&2
  cat << EOF
menuentry '$(gettext_printf "Memory test (memtest86+, experimental multiboot)")' {
EOF
  printf '%s\n' "${prepare_boot_cache}"
  cat << EOF
	multiboot	$MEMTESTPATH
}
EOF
  if [ "x${GRUB_MEMTEST_DISABLE_SERIAL}" != "xtrue" ]; then
  cat << EOF
menuentry '$(gettext_printf "Memory test (memtest86+, serial console, experimental multiboot)")' {
EOF
  printf '%s\n' "${prepare_boot_cache}"
  cat << EOF
	multiboot	$MEMTESTPATH console=${GRUB_MEMTEST_SERIAL_PARAMS}
}
EOF
  fi
fi