#! /bin/sh

# Install GRUB on your drive.
# 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@
sbindir=@sbindir@
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}`

grub_setup=${sbindir}/`echo grub-setup | sed ${transform}`
grub_mkimage=${bindir}/`echo grub-mkimage | sed ${transform}`
grub_mkdevicemap=${sbindir}/`echo grub-mkdevicemap | sed ${transform}`
grub_probe=${sbindir}/`echo grub-probe | sed ${transform}`
rootdir=
grub_prefix=`echo /boot/grub | sed ${transform}`
modules=

install_device=
no_floppy=
force_lba=
recheck=no
debug=no

# Usage: usage
# Print the usage.
usage () {
    cat <<EOF
Usage: grub-install [OPTION] install_device
Install GRUB on your drive.

  -h, --help              print this message and exit
  -v, --version           print the version information and exit
  --modules=MODULES       pre-load specified modules MODULES
  --root-directory=DIR    install GRUB images under the directory DIR
                          instead of the root directory
  --grub-setup=FILE       use FILE as grub-setup
  --grub-mkimage=FILE     use FILE as grub-mkimage
  --grub-mkdevicemap=FILE use FILE as grub-mkdevicemap
  --grub-probe=FILE       use FILE as grub-probe
  --no-floppy             do not probe any floppy drive
  --recheck               probe a device map even if it already exists

INSTALL_DEVICE can be a GRUB device name or a system device filename.

grub-install copies GRUB images into the DIR/boot directory specified by
--root-directory, and uses grub-setup to install grub into the boot
sector.

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 "grub-install (GNU GRUB ${PACKAGE_VERSION})"
	exit 0 ;;
    --modules=*)
	modules=`echo "$option" | sed 's/--modules=//'` ;;
    --root-directory=*)
	rootdir=`echo "$option" | sed 's/--root-directory=//'` ;;
    --grub-setup=*)
	grub_setup=`echo "$option" | sed 's/--grub-setup=//'` ;;
    --grub-mkimage=*)
	grub_mkimage=`echo "$option" | sed 's/--grub-mkimage=//'` ;;
    --grub-mkdevicemap=*)
	grub_mkdevicemap=`echo "$option" | sed 's/--grub-mkdevicemap=//'` ;;
    --grub-probe=*)
	grub_probe=`echo "$option" | sed 's/--grub-probe=//'` ;;
    --no-floppy)
	no_floppy="--no-floppy" ;;
    --recheck)
	recheck=yes ;;
    # This is an undocumented feature...
    --debug)
	debug=yes ;;
    -*)
	echo "Unrecognized option \`$option'" 1>&2
	usage
	exit 1
	;;
    *)
	if test "x$install_device" != x; then
	    echo "More than one install_devices?" 1>&2
	    usage
	    exit 1
	fi
	install_device="${option}" ;;
    esac
done

# for make_system_path_relative_to_its_root()
. ${libdir}/grub/update-grub_lib

if test "x$install_device" = x; then
    echo "install_device not specified." 1>&2
    usage
    exit 1
fi

# If the debugging feature is enabled, print commands.
if test $debug = yes; then
    set -x
fi

# Initialize these directories here, since ROOTDIR was initialized.
case "$host_os" in
netbsd* | openbsd*)
    # Because /boot is used for the boot block in NetBSD and OpenBSD, use /grub
    # instead of /boot/grub.
    grub_prefix=`echo /grub | sed ${transform}`
    bootdir=${rootdir}
    ;;
*)
    # Use /boot/grub by default.
    bootdir=${rootdir}/boot
    ;;
esac

grubdir=${bootdir}/`echo grub | sed ${transform}`
device_map=${grubdir}/device.map

grub_probe="${grub_probe} --device-map=${device_map}"

# Check if GRUB is installed.
set $grub_setup dummy
if test -f "$1"; then
    :
else
    echo "$1: Not found." 1>&2
    exit 1
fi

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

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

# Create the GRUB directory if it is not present.
test -d "$bootdir" || mkdir "$bootdir" || exit 1
test -d "$grubdir" || mkdir "$grubdir" || exit 1

# If --recheck is specified, remove the device map, if present.
if test $recheck = yes; then
    rm -f $device_map
fi

# Create the device map file if it is not present.
if test -f "$device_map"; then
    :
else
    # Create a safe temporary file.
    test -n "$mklog" && log_file=`$mklog`

    $grub_mkdevicemap --device-map=$device_map $no_floppy || exit 1
fi

# Make sure that there is no duplicated entry.
tmp=`sed -n '/^([fh]d[0-9]*)/s/\(^(.*)\).*/\1/p' $device_map \
    | sort | uniq -d | sed -n 1p`
if test -n "$tmp"; then
    echo "The drive $tmp is defined multiple times in the device map $device_map" 1>&2
    exit 1
fi

# Copy the GRUB images to the GRUB directory.
for file in ${grubdir}/*.mod ${grubdir}/*.lst ${grubdir}/*.img; do
    if test -f $file && [ "`basename $file`" != menu.lst ]; then
	rm -f $file || exit 1
    fi
done
for file in ${pkglibdir}/*.mod ${pkglibdir}/*.lst ${pkglibdir}/*.img; do
    cp -f $file ${grubdir} || exit 1
done

# Write device to a variable so we don't have to traverse /dev every time.
grub_device=`$grub_probe --target=device ${grubdir}`

# Create the core image. First, auto-detect the filesystem module.
fs_module=`$grub_probe --target=fs --device ${grub_device}`
if test "x$fs_module" = x -a "x$modules" = x; then
    echo "Auto-detection of a filesystem module failed." 1>&2
    echo "Please specify the module with the option \`--modules' explicitly." 1>&2
    exit 1
fi

# Then the partition map module.  In order to support partition-less media,
# this command is allowed to fail (--target=fs already grants us that the
# filesystem will be accessible).
partmap_module=`$grub_probe --target=partmap --device ${grub_device} 2> /dev/null`

# Device abstraction module, if any (lvm, raid).
devabstraction_module=`$grub_probe --target=abstraction --device ${grub_device}`

# _chain is often useful
modules="$modules $fs_module $partmap_module biosdisk $devabstraction_module _chain"

$grub_mkimage --output=${grubdir}/core.img --prefix=`make_system_path_relative_to_its_root ${grubdir}`/ $modules || exit 1

# Now perform the installation.
$grub_setup --directory=${grubdir} --device-map=${device_map} \
    ${install_device} || exit 1

# Prompt the user to check if the device map is correct.
echo "Installation finished. No error reported."
echo "This is the contents of the device map $device_map."
echo "Check if this is correct or not. If any of the lines is incorrect,"
echo "fix it and re-run the script \`grub-install'."
echo

cat $device_map

# Bye.
exit 0