grub-mkrescue.in

有助于了解操作系统如何启动之过程

#! /bin/sh -e

# Make GRUB rescue image
# 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@
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_mkimage=${bindir}/`echo grub-mkimage | sed ${transform}`

# Usage: usage
# Print the usage.
usage () {
    cat <<EOF
Usage: grub-mkrescue [OPTION] output_image
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
  --pkglibdir=DIR         use images from directory DIR
                          default: ${pkglibdir}
  --grub-mkimage=FILE     use FILE as grub-mkimage

grub-mkimage generates a bootable rescue CD image for PowerMac and CHRP.

Report bugs to <[e-mail]>.
EOF
}

input_dir=${pkglibdir}
grub_mkimage=grub-mkimage

# 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=//'` ;;
    --pkglibdir=*)
	input_dir=`echo "$option" | sed 's/--pkglibdir=//'` ;;
    --grub-mkimage=*)
	grub_mkimage=`echo "$option" | sed 's/--grub-mkimage=//'` ;;
    -*)
	echo "Unrecognized option \`$option'" 1>&2
	usage
	exit 1
	;;
    *)
	if test "x$output_image" != x; then
	    echo "Unrecognized option \`$option'" 1>&2
	    usage
	    exit 1
	fi
	output_image="${option}" ;;
    esac
done

if test "x$output_image" = x; then
  usage
  exit 1
fi

if [ "x${modules}" = "x" ] ; then
  modules=`cd ${input_dir}/ && ls *.mod`
fi

map_file=`mktemp`
cat >${map_file} <<EOF
# EXTN          XLate   CREATOR   TYPE     Comment
grub.img        Raw     'UNIX'    'tbxi'   "bootstrap"
EOF

iso_dir=`mktemp -d`
boot_dir=${iso_dir}/boot/grub
mkdir ${iso_dir}/boot
mkdir ${boot_dir}
core_img=${boot_dir}/grub.img
${grub_mkimage} -n -d ${input_dir}/ -o ${core_img} ${modules}
genisoimage -hfs -part -no-desktop -r -J -o ${output_image} \
 -map ${map_file} -hfs-bless ${boot_dir} -chrp-boot -sysid PPC \
 ${iso_dir}

rm -rf ${iso_dir}
rm -f ${map_file}

exit 0