grub-image.in

i386的bootloader源码grub

#! /bin/sh
# grub-image - Create a GRUB boot filesystem image and tarball
# Gordon Matzigkeit <[e-mail]>, 2000-07-25
#
#   Copyright (C) 2000, 2002 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

prefix=@prefix@
exec_prefix=@exec_prefix@
sbindir=@sbindir@
datadir=@datadir@
PACKAGE=@PACKAGE@
host_cpu=@host_cpu@
host_os=@host_os@
host_vendor=@host_vendor@
context=${host_cpu}-${host_vendor}
pkgdatadir=${datadir}/${PACKAGE}/${context}

mke2fs=/sbin/mke2fs

progname=`echo "$0" | sed 's%^.*/%%'`
thisdir=`echo "$0" | sed 's%/[^/]*$%%'`
test "X$thisdir" = "X$0" && thisdir=.

# See if we were invoked from within the build directory, and if so,
# use the built files rather than the installed ones.
if test -f $thisdir/../stage2/stage2; then
  grub_shell="$thisdir/../grub/grub"
  stage1dir="$thisdir/../stage1"
  stage2dir="$thisdir/../stage2"
else
  grub_shell=${sbindir}/grub
  stage1dir="$pkgdatadir"
  stage2dir="$pkgdatadir"
fi

# Exit on any error.
set -e

# Get GRUB's version from the Grub shell, since we use the
# installed files.
VERSION=`$grub_shell --version | sed -e 's/^.* \([0-9.]*\).*$/\1/'`
test "X$VERSION" != X

bootdir=${PACKAGE}-${VERSION}-${context}
image=$bootdir.ext2fs

# Create the tarball.
if test ! -f $bootdir.tar.gz; then
  echo "# Creating \`$bootdir.tar.gz'"
  mkdir -p $bootdir/boot/grub
  cp -p $stage1dir/stage1 $stage2dir/*_stage1_5 $stage2dir/stage2 \
    $bootdir/boot/grub
  test ! -f menu.lst || cp -p menu.lst $bootdir/boot/grub
  trap "rm -f $bootdir.tar.gz" 0
  GZIP=-9 tar -zcf $bootdir.tar.gz $bootdir
  trap '' 0
  rm -rf $bootdir
fi

# Create a new filesystem image of the specified size.
if test ! -f $image; then
  tarsize=`zcat $bootdir.tar.gz | wc -c`

  # Add about 30% (20% overhead plus 10% breathing room), and convert
  # to kilobytes.  This factor was determined empirically.
  SIZE=`expr $tarsize \* 130 / 100 / 1024`k
  echo "# Creating $SIZE disk image \`$image'"
  trap "rm -f $image" 0
  dd if=/dev/zero of=$image bs=$SIZE count=1 >/dev/null
  $mke2fs -F $image
  trap '' 0
fi


# Attempt to mount the image.
echo "# Mounting \`$image'"
test -d $bootdir || mkdir $bootdir
case "$host_os" in
gnu*)
  settrans -a $bootdir /hurd/ext2fs $image
  umount="settrans -a $bootdir"
  ;;

linux*)
  # This requires running as root, and using the loop device.
  i=0
  while test -e /dev/loop$i; do
    if /sbin/losetup /dev/loop$i $image; then
      break
    fi
    i=`expr $i + 1`
  done

  # Silly losetup doesn't report an error!
  mount /dev/loop$i $bootdir
  umount="umount $bootdir && /sbin/losetup -d /dev/loop$i && trap '' 0"
  ;;

*)
  echo "$progname: Mounting \`$image' under \`$host_os' is not supported" 1>&2
  exit 1
  ;;
esac
trap "$umount" 0

# Extract our tarball into the image, then unmount it.
echo "# Copying files into \`$image':"
tar -zxvf $bootdir.tar.gz

echo "# \`$image' usage:"
df $bootdir
eval $umount
rmdir $bootdir || :

# Use the GRUB shell to properly set up GRUB on the image.
echo "# Installing GRUB in \`$image'"
cat <<EOF | $grub_shell --batch --device-map=/dev/null
device (fd0) $image
root (fd0)
install /boot/grub/stage1 (fd0) /boot/grub/stage2
quit
EOF

exit 0