#! /bin/sh

# Install GRUB on your drive.
# Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2006 Free Software Foundation, Inc.
#
# This file 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 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St - Suite 330, Boston, MA 02110, USA.

# Initialize some variables.
prefix=@prefix@
exec_prefix=@exec_prefix@
sbindir=@sbindir@
libdir=@libdir@
PACKAGE_NAME=@PACKAGE_NAME@
PACKAGE_TARNAME=@PACKAGE_TARNAME@
PACKAGE_VERSION=@PACKAGE_VERSION@
host_cpu=@host_cpu@
platform=@platform@
pkglibdir=${libdir}/${PACKAGE_TARNAME}/${host_cpu}-${platform}

grub_setup=${sbindir}/grub-setup
grub_mkimage=${sbindir}/grub-mkimage
grub_mkdevicemap=${sbindir}/grub-mkdevicemap
grub_probefs=${sbindir}/grub-probefs
rootdir=
grub_prefix=/boot/grub
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-probefs=FILE     use FILE as grub-probefs
  --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 specfied 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-probefs=*)
	grub_probefs=`echo "$option" | sed 's/--grub-probefs=//'` ;;
    --no-floppy)
	no_floppy="--no-floppy" ;;
    --recheck)
	recheck=yes ;;
    # This is an undocumented feature...
    --debug)
	debug=yes ;;
    -*)
	echo "Unrecognized option \`$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

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 "$host_os" in
netbsd* | openbsd*)
    # Because /boot is used for the boot block in NetBSD and OpenBSD, use /grub
    # instead of /boot/grub.
    grub_prefix=/grub
    bootdir=${rootdir}
    ;;
*)
    # Use /boot/grub by default.
    bootdir=${rootdir}/boot
    ;;
esac

grubdir=${bootdir}/grub
device_map=${grubdir}/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; 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

# Create the core image. First, auto-detect the filesystme module.
fs_module=`$grub_probefs --device-map=${device_map} ${grubdir}`
if test "x$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

# Typically, _chain and pc are required.
modules="$modules $fs_module _chain pc"

$grub_mkimage --output=${grubdir}/core.img $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