grubレスキュー

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grubレスキューディスクを作成

Ubuntuにはgrubレスキューisoイメージを作成するシェルスクリプトが入っている
$ cat `which grub-mkrescue`
#! /bin/sh
set -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 .

# Initialize some variables.
transform="s,x,x,"

prefix=/usr
exec_prefix=${prefix}
bindir=${exec_prefix}/bin
libdir=${exec_prefix}/lib
PACKAGE_NAME=GRUB
PACKAGE_TARNAME=grub
PACKAGE_VERSION=1.98+20100804-5ubuntu3
target_cpu=i386
native_platform=pc
pkglib_DATA="efiemu32.o efiemu64.o moddep.lst command.lst fs.lst partmap.lst parttool.lst handler.lst video.lst crypto.lst terminal.lst"

self=`basename $0`

multiboot_dir=${libdir}/$(echo ${PACKAGE_TARNAME} | sed ${transform})/i386-multiboot
coreboot_dir=${libdir}/$(echo ${PACKAGE_TARNAME} | sed ${transform})/i386-coreboot
qemu_dir=${libdir}/$(echo ${PACKAGE_TARNAME} | sed ${transform})/i386-qemu
pc_dir=${libdir}/$(echo ${PACKAGE_TARNAME} | sed ${transform})/i386-pc
efi32_dir=${libdir}/$(echo ${PACKAGE_TARNAME} | sed ${transform})/i386-efi
efi64_dir=${libdir}/$(echo ${PACKAGE_TARNAME} | sed ${transform})/x86_64-efi
rom_directory=
override_dir=
grub_mkimage=${bindir}/`echo grub-mkimage | sed ${transform}`

xorriso=xorriso
diet=no

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

-h, --help print this message and exit
-v, --version print the version information and exit
-o, --output=FILE save output in FILE [required]
--modules=MODULES pre-load specified modules MODULES
--rom-directory=DIR save rom images in DIR [optional]
--xorriso=FILE use FILE as xorriso [optional]
--grub-mkimage=FILE use FILE as grub-mkimage
--diet apply size reducing measures [optional]

$self generates a bootable rescue image with specified source files, source
directories, or mkisofs options listed by: xorriso -as mkisofs -help
Option -- switches to native xorriso command mode. or directories.

Report bugs to .
Mail xorriso support requests to .
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=//'` ;;

-o | --output)
output_image=`argument $option "$@"`; shift ;;
--output=*)
output_image=`echo "$option" | sed 's/--output=//'` ;;

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

# Intentionally undocumented
--override-directory)
override_dir=`argument $option "$@"`
shift
PATH=${override_dir}:$PATH
export PATH
;;
--override-directory=*)
override_dir=`echo "${option}/" | sed 's/--override-directory=//'`
PATH=${override_dir}:$PATH
export PATH
;;

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

--xorriso)
xorriso=`argument $option "$@"`; shift ;;
--xorriso=*)
xorriso=`echo "${option}/" | sed 's/--xorriso=//'` ;;

--diet)
diet=yes ;;

*)
source="${source} ${option} $@"; break ;;
esac
done

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

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

if test "x$TMP" != x; then
MKTEMP_TEMPLATE="$TMP/grub-mkrescue.XXXXXXXXXX"
elif test "x$TEMP" != x; then
MKTEMP_TEMPLATE="$TEMP/grub-mkrescue.XXXXXXXXXX"
else
MKTEMP_TEMPLATE="/tmp/grub-mkrescue.XXXXXXXXXX"
fi

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

process_input_dir ()
{
input_dir="$1"
platform="$2"
mkdir -p ${iso9660_dir}/boot/grub/${platform}
for file in ${input_dir}/*.mod; do
if test -f "$file"; then
cp -f "$file" ${iso9660_dir}/boot/grub/${platform}/
fi
done
for file in ${pkglib_DATA}; do
if test -f "${input_dir}/${file}"; then
cp -f "${input_dir}/${file}" ${iso9660_dir}/boot/grub/${platform}/
fi
done

mkdir -p ${iso9660_dir}/boot/grub/locale
for file in ${input_dir}/po/*.mo; do
if test -f "$file"; then
cp -f "$file" ${iso9660_dir}/boot/grub/locale/
fi
done
}

make_image ()
{
source_directory="$1"
platform=$2
if ! test -e "${source_directory}"; then
return;
fi

echo "Enabling $2 support ..."

memdisk_img=`mktemp "$MKTEMP_TEMPLATE"`
memdisk_dir=`mktemp -d "$MKTEMP_TEMPLATE"`
mkdir -p ${memdisk_dir}/boot/grub

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

(cd "${memdisk_dir}"; tar -cf - boot) > "${memdisk_img}"
rm -rf ${memdisk_dir}
$grub_mkimage -O ${platform} -d "${source_directory}" -m "${memdisk_img}" -o "$3" --prefix='(memdisk)/boot/grub' \
search iso9660 configfile normal memdisk tar $4
rm -rf ${memdisk_img}
}

if [ "${override_dir}" = "" ] ; then
if test -e "${multiboot_dir}" ; then
process_input_dir ${multiboot_dir} i386-multiboot
fi
if test -e "${coreboot_dir}" ; then
process_input_dir ${coreboot_dir} i386-coreboot
fi
if test -e "${qemu_dir}" ; then
process_input_dir ${qemu_dir} i386-qemu
fi
if test -e "${pc_dir}" ; then
process_input_dir ${pc_dir} i386-pc
fi
if test -e "${efi32_dir}" ; then
process_input_dir ${efi32_dir} i386-efi
fi
if test -e "${efi64_dir}" ; then
process_input_dir ${efi64_dir} x86_64-efi
fi
else
process_input_dir ${override_dir} ${target_cpu}-${native_platform}
multiboot_dir=
pc_dir=
efi32_dir=
efi64_dir=
coreboot_dir=
qemu_dir=
case "${target_cpu}-${native_platform}" in
i386-multiboot) multiboot_dir=${override_dir} ;;
i386-coreboot) coreboot_dir=${override_dir} ;;
i386-qemu) qemu_dir=${override_dir} ;;
i386-pc) pc_dir=${override_dir} ;;
i386-efi) efi32_dir=${override_dir} ;;
x86_64-efi) efi64_dir=${override_dir} ;;
esac
fi

# obtain date-based UUID
iso_uuid=$(date -u +%Y-%m-%d-%H-%M-%S-00)
grub_mkisofs_arguments="${grub_mkisofs_arguments} --modification-date=$(echo ${iso_uuid} | sed -e s/-//g)"

# build BIOS core.img
if test -e "${pc_dir}" ; then
echo "Enabling BIOS support ..."
core_img=`mktemp "$MKTEMP_TEMPLATE"`
$grub_mkimage -O i386-pc -d ${pc_dir}/ -o ${core_img} --prefix=/boot/grub/i386-pc \
iso9660 biosdisk
cat ${pc_dir}/cdboot.img ${core_img} > ${iso9660_dir}/boot/grub/i386-pc/eltorito.img

embed_img=`mktemp "$MKTEMP_TEMPLATE"`
cat ${pc_dir}/boot.img ${core_img} > ${embed_img}

rm -f ${core_img}

(for i in $(cat ${pc_dir}/partmap.lst) ${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 -no-emul-boot -boot-info-table \
--embedded-boot ${embed_img}"
fi

# build multiboot core.img
make_image "${multiboot_dir}" i386-multiboot "${iso9660_dir}/boot/multiboot.img" "ata at_keyboard"

if test -e "${efi64_dir}" || test -e "${efi32_dir}"; then
efi_dir=`mktemp -d "$MKTEMP_TEMPLATE"`
mkdir -p "${efi_dir}/efi/boot"

# build bootx64.efi
make_image "${efi64_dir}" x86_64-efi "${efi_dir}"/efi/boot/bootx64.efi ""
# build bootia32.efi
make_image "${efi32_dir}" i386-efi "${efi_dir}"/efi/boot/bootia32.efi ""

mformat -C -f 2880 -L 16 -i "${iso9660_dir}"/efi.img ::
mcopy -s -i "${iso9660_dir}"/efi.img ${efi_dir}/efi ::/
rm -rf ${efi_dir}
grub_mkisofs_arguments="${grub_mkisofs_arguments} --efi-boot efi.img"
fi

make_image "${qemu_dir}" i386-qemu "${iso9660_dir}/boot/qemu.img" "ata at_keyboard"
if [ -e "${iso9660_dir}/boot/qemu.img" ] && [ -d "${rom_directory}" ]; then
cp "${iso9660_dir}/boot/qemu.img" "${rom_directory}/qemu.img"
fi
make_image "${coreboot_dir}" i386-coreboot "${iso9660_dir}/boot/coreboot.elf" "ata at_keyboard"
if [ -e "${iso9660_dir}/boot/coreboot.elf" ] && [ -d "${rom_directory}" ]; then
cp "${iso9660_dir}/boot/coreboot.elf" "${rom_directory}/coreboot.elf"
fi

# build iso image
if [ "${diet}" = yes ]; then
if [ -e "${output_image}" ]; then
rm "${output_image}" || exit 1
fi
"${xorriso}" -report_about HINT -as mkisofs -graft-points -no-pad ${grub_mkisofs_arguments} --protective-msdos-label -r ${iso9660_dir} --sort-weight 0 / --sort-weight 1 /boot ${source} | cat >"${output_image}"
else
"${xorriso}" -report_about HINT -as mkisofs -graft-points ${grub_mkisofs_arguments} --protective-msdos-label -o ${output_image} -r ${iso9660_dir} --sort-weight 0 / --sort-weight 1 /boot ${source}
fi
rm -rf ${iso9660_dir}

rm -f ${embed_img}

exit 0

こいつを使ってレスキューディスクを作ろう
何かのミスでMBRやgrubブートローダーが消されたり、USBブート非対応のマシンでUSBブートをしたりするときに役立つかも

grubレスキューディスクイメージを作成
$ grub-mkrescue -o grub.iso
ディスクに書き込み
$ cdrecord dev=0,0,0 grub.iso

grubレスキューディスクを優先起動するように設定すれば、grubプロンプトが表示されるようになる

Linuxを起動する場合
grub> insmod ext2
grub> ls
(hd0,0) (hd0,1) (hd0,5)  ←hd0,0=sda1 hd0,1=sda2 hd0,5=sda5に対応する
grub> linux /boot/vmlinuz ro root=/dev/sda5  ←バージョンを省いたリンクが貼ってない場合はTAB補完を使うと楽
grub> initrd /boot/initrd.img
grub> boot

Winを起動する場合
grub> insmod ntfs
grub> set root=(hd0,1)
grub> drivemap -s (hd0) ${root}
grub> chainloader +1
grub> boot
chainloaderに指定している+1は0+1の省で最初の1ブロックを示す。つまりパーティションの最初のセクタをロードするオプション。

grubをsdaにインストール
grub> set root=(hd0,0)
grub> setup (hd0)
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