#! /bin/sh -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@

coreboot_dir=${libdir}/$(echo ${PACKAGE_TARNAME} | sed ${transform})/${target_cpu}-coreboot
pc_dir=${libdir}/$(echo ${PACKAGE_TARNAME} | sed ${transform})/${target_cpu}-pc

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

  -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 [required]

$0 generates a bootable rescue image with specified source files or directories.

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

# 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 "$option" | sed 's/--output=//'` ;;
    # Intentionally undocumented
    --override-directory=*)
	override_dir=`echo "${option}/" | sed 's/--override-directory=//'`
	PATH=${override_dir}:$PATH
	export PATH
	;;
    -*)
	echo "Unrecognized option \`$option'" 1>&2
	usage
	exit 1
	;;
    *)
	source="${source} ${option}" ;;
    esac
done

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

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

process_input_dir ()
{
    input_dir="$1"
    platform="$2"
    mkdir -p ${iso9660_dir}/boot/grub/${target_cpu}-${platform}
    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" ${iso9660_dir}/boot/grub/${target_cpu}-${platform}/
        fi
    done
}

if [ "${override_dir}" = "" ] ; then
    if test -e "${coreboot_dir}" ; then
        process_input_dir ${coreboot_dir} coreboot
    fi
    if test -e "${pc_dir}" ; then
        process_input_dir ${pc_dir} pc
    fi
else
    process_input_dir ${override_dir} ${native_platform}
    coreboot_dir=
    pc_dir=
    case "${native_platform}" in
        coreboot) coreboot_dir=${override_dir} ;;
        pc) pc_dir=${override_dir} ;;
    esac
fi

# build coreboot core.img
if test -e "${coreboot_dir}" ; then
    echo "Generates coreboot"
    memdisk_img=`mktemp`
    memdisk_dir=`mktemp -d`
    mkdir -p ${memdisk_dir}/boot/grub
    # obtain date-based UUID
    iso_uuid=$(date +%Y-%m-%d-%H-%M-%S-00)

    modules="$(cat ${coreboot_dir}/partmap.lst) ${modules}"
    cat << EOF > ${memdisk_dir}/boot/grub/grub.cfg
search --fs-uuid --set ${iso_uuid}
set prefix=(\${root})/boot/grub/${target_cpu}-coreboot
EOF
    (for i in ${modules} ; do
        echo "insmod $i"
    done ; \
    echo "source /boot/grub/grub.cfg") \
    > ${iso9660_dir}/boot/grub/i386-pc/grub.cfg

    tar -C ${memdisk_dir} -cf ${memdisk_img} boot
    rm -rf ${memdisk_dir}
    grub-mkelfimage -d ${coreboot_dir}/ -m ${memdisk_img} -o ${iso9660_dir}/boot/multiboot.img \
        memdisk tar search iso9660 configfile sh \
        ata at_keyboard
    rm -f ${memdisk_img}
    grub_mkisofs_arguments="${grub_mkisofs_arguments} --modification-date=$(echo ${iso_uuid} | sed -e s/-//g)"
fi

# build eltorito core.img
if test -e "${pc_dir}" ; then
    echo "Generates eltorito"
    core_img=`mktemp`
    grub-mkimage -d ${pc_dir}/ -o ${core_img} --prefix=/boot/grub/i386-pc \
        memdisk tar search iso9660 configfile sh \
        biosdisk
    cat ${pc_dir}/cdboot.img ${core_img} > ${iso9660_dir}/boot/grub/i386-pc/eltorito.img
    rm -f ${core_img}

    modules="$(cat ${pc_dir}/partmap.lst) ${modules}"
    (for i in ${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 -boot-info-table"
fi

# build iso image
grub-mkisofs ${grub_mkisofs_arguments} -o ${output_image} -r ${iso9660_dir} ${source}
rm -rf ${iso9660_dir}

exit 0