#! /bin/sh
set -e

# Make GRUB rescue image
# Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009  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@
native_platform=@platform@
pkglib_DATA="@pkglib_DATA@"

self=`basename $0`

multiboot_dir=${libdir}/$(echo ${PACKAGE_TARNAME} | sed ${transform})/i386-multiboot
coreboot_dir=${libdir}/$(echo ${PACKAGE_TARNAME} | sed ${transform})/i386-coreboot
qemu_dir=${libdir}/$(echo ${PACKAGE_TARNAME} | sed ${transform})/i386-qemu
pc_dir=${libdir}/$(echo ${PACKAGE_TARNAME} | sed ${transform})/i386-pc
efi32_dir=${libdir}/$(echo ${PACKAGE_TARNAME} | sed ${transform})/i386-efi
efi64_dir=${libdir}/$(echo ${PACKAGE_TARNAME} | sed ${transform})/x86_64-efi
rom_directory=
override_dir=
grub_mkimage=${bindir}/`echo grub-mkimage | sed ${transform}`

xorriso=xorriso

# Usage: usage
# Print the usage.
usage () {
    cat <<EOF
Usage: $self [OPTION] SOURCE...
Make GRUB rescue image.

  -h, --help              print this message and exit
  -v, --version           print the version information and exit
  -o, --output=FILE       save output in FILE [required]
  --modules=MODULES       pre-load specified modules MODULES
  --rom-directory=DIR     save rom images in DIR [optional]
  --xorriso=FILE          use FILE as xorriso [optional]
  --grub-mkimage=FILE     use FILE as grub-mkimage

$self generates a bootable rescue image with specified source files, source
directories, or mkisofs options listed by: xorriso -as mkisofs -help
Option -- switches to native xorriso command mode. or directories.

Report bugs to <bug-grub@gnu.org>.
Mail xorriso support requests to <bug-xorriso@gnu.org>.
EOF
}

argument () {
  opt=$1
  shift

  if test $# -eq 0; then
      echo "$0: option requires an argument -- '$opt'" 1>&2
      exit 1
  fi
  echo $1
}

# Check the arguments.
while test $# -gt 0
do
    option=$1
    shift

    case "$option" in
    -h | --help)
	usage
	exit 0 ;;
    -v | --version)
	echo "$self (${PACKAGE_NAME}) ${PACKAGE_VERSION}"
	exit 0 ;;

    --modules)
        modules=`argument $option "$@"`; shift ;;
    --modules=*)
	modules=`echo "$option" | sed 's/--modules=//'` ;;

    -o | --output)
	output_image=`argument $option "$@"`; shift ;;
    --output=*)
	output_image=`echo "$option" | sed 's/--output=//'` ;;

    --rom-directory)
        rom_directory=`argument $option "$@"`; shift ;;
    --rom-directory=*)
	rom_directory=`echo "$option" | sed 's/--rom-directory=//'` ;;

    # Intentionally undocumented
    --override-directory)
        override_dir=`argument $option "$@"`
	shift
	PATH=${override_dir}:$PATH
	export PATH
	;;
    --override-directory=*)
	override_dir=`echo "${option}/" | sed 's/--override-directory=//'`
	PATH=${override_dir}:$PATH
	export PATH
	;;

    --grub-mkimage)
	grub_mkimage=`argument $option "$@"`; shift ;;
    --grub-mkimage=*)
	grub_mkimage=`echo "$option" | sed 's/--grub-mkimage=//'` ;;

    --xorriso)
	xorriso=`argument $option "$@"`; shift ;;
    --xorriso=*)
        xorriso=`echo "${option}/" | sed 's/--xorriso=//'` ;;

    *)
	source="${source} ${option} $@"; break ;;
    esac
done

if [ "x${output_image}" = x ] ; then
  echo "output file must be given" >&2
  usage
  exit 1
fi

set $grub_mkimage dummy
if test -f "$1"; then
    :
else
    echo "$1: Not found." 1>&2
    exit 1
fi

if test "x$TMP" != x; then
  MKTEMP_TEMPLATE="$TMP/grub-mkrescue.XXXXXXXXXX"
elif test "x$TEMP" != x; then
  MKTEMP_TEMPLATE="$TEMP/grub-mkrescue.XXXXXXXXXX"
else
  MKTEMP_TEMPLATE="/tmp/grub-mkrescue.XXXXXXXXXX"
fi

iso9660_dir=`mktemp -d "$MKTEMP_TEMPLATE"`
mkdir -p ${iso9660_dir}/boot/grub

process_input_dir ()
{
    input_dir="$1"
    platform="$2"
    mkdir -p ${iso9660_dir}/boot/grub/${platform}
    for file in ${input_dir}/*.mod; do
        if test -f "$file"; then
            cp -f "$file" ${iso9660_dir}/boot/grub/${platform}/
        fi
    done
    for file in ${pkglib_DATA}; do
	if test -f "${input_dir}/${file}"; then
            cp -f "${input_dir}/${file}" ${iso9660_dir}/boot/grub/${platform}/
	fi
    done

    mkdir -p ${iso9660_dir}/boot/grub/locale
    for file in ${input_dir}/po/*.mo; do
        if test -f "$file"; then
	    cp -f "$file" ${iso9660_dir}/boot/grub/locale/
	fi
    done
}

make_image ()
{
    source_directory="$1"
    platform=$2
    if ! test -e "${source_directory}"; then
	return;
    fi

    echo "Enabling $2 support ..."

    memdisk_img=`mktemp "$MKTEMP_TEMPLATE"`
    memdisk_dir=`mktemp -d "$MKTEMP_TEMPLATE"`
    mkdir -p ${memdisk_dir}/boot/grub

    cat << EOF > ${memdisk_dir}/boot/grub/grub.cfg
search --fs-uuid --set ${iso_uuid}
set prefix=(\${root})/boot/grub/${platform}
source \$prefix/grub.cfg
EOF
    (for i in $(cat ${source_directory}/partmap.lst) ${modules} ; do
        echo "insmod $i"
    done ; \
    echo "source /boot/grub/grub.cfg") \
    > ${iso9660_dir}/boot/grub/${platform}/grub.cfg

    tar -C ${memdisk_dir} -cf ${memdisk_img} boot
    rm -rf ${memdisk_dir}
    $grub_mkimage -O ${platform} -d "${source_directory}" -m "${memdisk_img}" -o "$3" --prefix='(memdisk)/boot/grub' \
        search iso9660 configfile normal memdisk tar $4
    rm -rf ${memdisk_img}
}

if [ "${override_dir}" = "" ] ; then
    if test -e "${multiboot_dir}" ; then
        process_input_dir ${multiboot_dir} i386-multiboot
    fi
    if test -e "${coreboot_dir}" ; then
        process_input_dir ${coreboot_dir} i386-coreboot
    fi
    if test -e "${qemu_dir}" ; then
        process_input_dir ${qemu_dir} i386-qemu
    fi
    if test -e "${pc_dir}" ; then
        process_input_dir ${pc_dir} i386-pc
    fi
    if test -e "${efi32_dir}" ; then
        process_input_dir ${efi32_dir} i386-efi
    fi
    if test -e "${efi64_dir}" ; then
        process_input_dir ${efi64_dir} x86_64-efi
    fi
else
    process_input_dir ${override_dir} ${target_cpu}-${native_platform}
    multiboot_dir=
    pc_dir=
    efi32_dir=
    efi64_dir=
    coreboot_dir=
    qemu_dir=
    case "${target_cpu}-${native_platform}" in
        i386-multiboot) multiboot_dir=${override_dir} ;;
        i386-coreboot) coreboot_dir=${override_dir} ;;
        i386-qemu) qemu_dir=${override_dir} ;;
        i386-pc) pc_dir=${override_dir} ;;
	i386-efi) efi32_dir=${override_dir} ;;
	x86_64-efi) efi64_dir=${override_dir} ;;
    esac
fi

# obtain date-based UUID
iso_uuid=$(date -u +%Y-%m-%d-%H-%M-%S-00)
grub_mkisofs_arguments="${grub_mkisofs_arguments} --modification-date=$(echo ${iso_uuid} | sed -e s/-//g)"

# build BIOS core.img
if test -e "${pc_dir}" ; then
    echo "Enabling BIOS support ..."
    core_img=`mktemp "$MKTEMP_TEMPLATE"`
    $grub_mkimage -O i386-pc -d ${pc_dir}/ -o ${core_img} --prefix=/boot/grub/i386-pc \
        iso9660 biosdisk
    cat ${pc_dir}/cdboot.img ${core_img} > ${iso9660_dir}/boot/grub/i386-pc/eltorito.img

    embed_img=`mktemp "$MKTEMP_TEMPLATE"`
    cat ${pc_dir}/boot.img ${core_img} > ${embed_img}

    rm -f ${core_img}

    (for i in $(cat ${pc_dir}/partmap.lst) ${modules} ; do
        echo "insmod $i"
    done ; \
    echo "source /boot/grub/grub.cfg") \
    > ${iso9660_dir}/boot/grub/i386-pc/grub.cfg

    grub_mkisofs_arguments="${grub_mkisofs_arguments} -b boot/grub/i386-pc/eltorito.img -no-emul-boot -boot-info-table \
		--embedded-boot ${embed_img}"
fi

# build multiboot core.img
make_image "${multiboot_dir}" i386-multiboot "${iso9660_dir}/boot/multiboot.img" "ata at_keyboard"

if test -e "${efi64_dir}" || test -e "${efi32_dir}"; then
    efi_dir=`mktemp -d "$MKTEMP_TEMPLATE"`
    mkdir -p "${efi_dir}/efi/boot"

    # build bootx64.efi
    make_image "${efi64_dir}" x86_64-efi "${efi_dir}"/efi/boot/bootx64.efi ""
    # build bootia32.efi
    make_image "${efi32_dir}" i386-efi "${efi_dir}"/efi/boot/bootia32.efi ""

    mformat -C -f 2880 -L 16 -i "${iso9660_dir}"/efi.img ::
    mcopy -s -i "${iso9660_dir}"/efi.img ${efi_dir}/efi ::/
    grub_mkisofs_arguments="${grub_mkisofs_arguments} --efi-boot efi.img"
fi

make_image "${qemu_dir}" i386-qemu "${iso9660_dir}/boot/qemu.img" "ata at_keyboard"
if [ -e "${iso9660_dir}/boot/qemu.img" ] && [ -d "${rom_directory}" ]; then
    cp "${iso9660_dir}/boot/qemu.img" "${rom_directory}/qemu.img"
fi
make_image "${coreboot_dir}" i386-coreboot "${iso9660_dir}/boot/coreboot.elf" "ata at_keyboard"
if [ -e "${iso9660_dir}/boot/coreboot.elf" ] && [ -d "${rom_directory}" ]; then
    cp "${iso9660_dir}/boot/coreboot.elf" "${rom_directory}/coreboot.elf"
fi

# build iso image
"${xorriso}" -as mkisofs -graft-points ${grub_mkisofs_arguments} --protective-msdos-label -o ${output_image} -r ${iso9660_dir} --sort-weight 0 / --sort-weight 1 /boot ${source}
rm -rf ${iso9660_dir}

rm -f ${embed_img}

exit 0