#! /bin/sh -e

# Make GRUB rescue floppy
# Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2006,2007,2008  Free Software Foundation, Inc.
#
# GRUB is free software: 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.
#
# GRUB is 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.

# Initialize some variables.
transform="@program_transform_name@"

prefix=@prefix@
exec_prefix=@exec_prefix@
bindir=@bindir@
libdir=@libdir@
PACKAGE_NAME=@PACKAGE_NAME@
PACKAGE_TARNAME=@PACKAGE_TARNAME@
PACKAGE_VERSION=@PACKAGE_VERSION@
target_cpu=@target_cpu@
platform=@platform@
pkglibdir=${libdir}/`echo ${PACKAGE_TARNAME}/${target_cpu}-${platform} | sed ${transform}`

# Usage: usage
# Print the usage.
usage () {
    cat <<EOF
Usage: $0 [OPTION] output_image
Make GRUB rescue floppy.

  -h, --help              print this message and exit
  -v, --version           print the version information and exit
  --modules=MODULES       pre-load specified modules MODULES
  --output=FILE           save output in FILE

$0 generates a bootable rescue floppy.

Report bugs to <bug-grub@gnu.org>.
EOF
}

input_dir=${pkglibdir}

# Check the arguments.
for option in "$@"; do
    case "$option" in
    -h | --help)
	usage
	exit 0 ;;
    -v | --version)
	echo "$0 (GNU GRUB ${PACKAGE_VERSION})"
	exit 0 ;;
    --modules=*)
	modules=`echo "$option" | sed 's/--modules=//'` ;;
    --output=*)
	output_image=`echo "$option" | sed 's/--output=//'` ;;
    -*)
	echo "Unrecognized option \`$option'" 1>&2
	usage
	exit 1
	;;
    *)
	if test "x$output_image" != x; then
	    echo "Unrecognized option \`$option'" 1>&2
	    usage
	    exit 1
	fi
	output_image="${option}" ;;
    esac
done

if test "x$output_image" = x; then
  usage
  exit 1
fi

aux_dir=`mktemp -d`
mkdir -p ${aux_dir}/boot/grub

for file in ${input_dir}/*.mod ${input_dir}/efiemu??.o \
  ${input_dir}/command.lst ${input_dir}/moddep.lst ${input_dir}/fs.lst \
  ${input_dir}/handler.lst ${input_dir}/parttool.lst; do
  if test -f "$file"; then
    cp -f "$file" ${aux_dir}/boot/grub/
  fi
done

modules="$(cat ${input_dir}/partmap.lst) ${modules}"
for i in ${modules} ; do
  echo "insmod $i"
done > ${aux_dir}/boot/grub/grub.cfg

# build memdisk
memdisk_img=`mktemp`
tar -C ${aux_dir} -cf ${memdisk_img} boot
rm -rf ${aux_dir}

# build core.img
core_img=`mktemp`
grub-mkimage -d ${input_dir}/ -m ${memdisk_img} -o ${core_img} memdisk tar biosdisk
rm -f ${memdisk_img}

# build floppy image
cat ${input_dir}/boot.img ${core_img} /dev/zero | dd bs=1024 count=1440 > ${output_image}
rm -f ${core_img}

exit 0