#! /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/>.

# This script uses `ofpathname', which is downloadable from
# http://ppc64-utils.ozlabs.org .

# 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}`

self=`basename $0`

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

install_device=
debug=no
update_nvram=yes

ofpathname=`which ofpathname`
nvsetenv=`which nvsetenv`

# Usage: usage
# Print the usage.
usage () {
    cat <<EOF
Usage: $self [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-mkdevicemap=FILE use FILE as grub-mkdevicemap
  --grub-mkimage=FILE     use FILE as grub-mkimage
  --grub-probe=FILE       use FILE as grub-probe
  --no-nvram              don't update the boot-device NVRAM variable

$self copies GRUB images into the DIR/boot directory specified by
--root-directory, and uses nvsetenv to set the Open Firmware boot-device
variable.

Report bugs to <bug-grub@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=//'` ;;

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

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

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

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

    --no-nvram)
	update_nvram=no ;;
    # 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 the debugging feature is enabled, print commands.
if test $debug = yes; then
    set -x
fi

# Initialize these directories here, since ROOTDIR was initialized.
bootdir=${rootdir}/boot
grubdir=${bootdir}/`echo grub | sed ${transform}`
device_map=${grubdir}/device.map

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

# Find the partition at the right mount point.
install_device=`$grub_mkdevicemap --device-map=/dev/stdout | $grub_probe --target=device --device-map=/dev/stdin ${grubdir}`

if test "x$install_device" = "x`$grub_mkdevicemap --device-map=/dev/stdout | $grub_probe --target=device --device-map=/dev/stdin ${bootdir}`"; then
    echo "$grubdir must be a mount point."
    exit 1
fi
# XXX warn on firmware-unreadable filesystems?

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

# 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

# Copy the GRUB images to the GRUB directory.
for file in ${grubdir}/*.mod ${grubdir}/*.lst ; do
    if test -f $file; then
	rm -f $file || exit 1
    fi
done
for file in ${pkglibdir}/*.mod ${pkglibdir}/*.lst ; do
    cp -f $file ${grubdir} || exit 1
done

if ! test -f ${grubdir}/grubenv; then
    $grub_editenv ${grubdir}/grubenv create
fi

# Create the core image. First, auto-detect the filesystem module.
fs_module=`$grub_probe --target=fs --device-map=${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

# 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=
for x in `$grub_probe --target=partmap --device ${grub_device} 2> /dev/null`; do
   partmap_module="$partmap_module part_$x";
done

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

modules="$modules $fs_module $partmap_module $devabstraction_module"

# Now perform the installation.
"$grub_mkimage" -O ${target_cpu}-ieee1275 --directory=${pkglibdir} --output=${grubdir}/grub $modules || exit 1

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

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

    # Get the Open Firmware device tree path translation.
    dev=`echo $install_device | sed -e 's/\/dev\///' -e 's/[0-9]\+//'`
    partno=`echo $install_device | sed -e 's/.*[^0-9]\([0-9]\+\)$/\1/'`
    ofpath=`$ofpathname $dev` || {
	echo "Couldn't find Open Firmware device tree path for $dev."
	echo "You will have to set boot-device manually."
	exit 1
    }

    # Point boot-device at the new grub install
    boot_device="$ofpath:$partno,\\grub"
    "$nvsetenv" boot-device "$boot_device" || {
	echo "$nvsetenv failed."
	echo "You will have to set boot-device manually.  At the Open Firmware prompt, type:"
	echo "  setenv boot-device $boot_device"
	exit 1
    }
fi

# 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 $device_map."
echo "Check if this is correct or not. If any of the lines is incorrect,"
echo "fix it and re-run the script \`$self'."
echo

cat $device_map

# Bye.
exit 0