[CentOS] Reinstall Windows but preserve CentOS
Phil Schaffner
Philip.R.Schaffner at nasa.gov
Fri Jul 29 15:02:08 UTC 2005
On Fri, 2005-07-29 at 22:49 +0900, Dave Gutteridge wrote:
> How can I reinstall Windows with a clean partition, and preserve my
> dual booting?
Can make a Grub boot floppy with a copy of the current grub.conf - see
script at bottom, [a simpler approach is to use "grub-install /dev/fd0"
to create a GRUB floppy, but I like having the config on the floppy -
allows modifications for different boot defaults, as well as providing a
backup] and/or make a boot CD:
# mkbootdisk --iso --device boot`uname -r`.iso `uname -r`
On my system this results in file boot2.6.9-11.106.unsupportedsmp.iso
which can then be written to CD with
# cdrecord -v -dao -eject -data driveropts=burnfree dev=/dev/hda boot2.6.9-11.106.unsupportedsmp.iso
(all one line - watch for wraps)
Either method will let you boot back to the installed system without
going though the rescue gyrations. Can then rewrite grub with
# grub-install /dev/hda [ or whatever boot device ]
Phil
------------------------ Cut Here ---------------------------------
#!/bin/bash
# mkgrubdisk
#
# Written by Phil Schaffner <p.r.schaffner at ieee.org>
# based on mkbootdisk by Erik Troan <ewt at redhat.com>
pause=yes
format=yes
device=/dev/fd0
unset verbose
GRUBDIR=/boot/grub
MOUNTDIR=/tmp/mkgrubmenu
PATH=/sbin:$PATH
export PATH
VERSION=0.1
usage () {
cat >&2 <<EOF
usage: `basename $0` [--version] [--noprompt] [--noformat]
[--device <devicefile>] [--grubdir <dir>] [--verbose -v]
(ex: `basename $0` --device /dev/fd1)
EOF
exit $1
}
while [ $# -gt 0 ]; do
case $1 in
--device)
shift
device=$1
;;
--grubdir)
shift
GRUBDIR=$1
;;
--help)
usage 0
;;
--noprompt)
unset pause
;;
--noformat)
unset format
;;
-v)
verbose=true
;;
--verbose)
verbose=true
;;
--version)
echo "mkgrubdisk: version $VERSION"
exit 0
;;
*)
usage
;;
esac
shift
done
[ -d $GRUBDIR ] || {
echo "$GRUBDIR is not a directory!" >&2
exit 1
}
if [ -e "$device" ]; then {
[ -n "$pause" ] && {
echo -n "Insert a"
[ -n "$format" ] || echo -n " vfat formatted"
echo " disk in $device."
echo "Any information on the disk will be lost."
echo -n "Press <Enter> to continue or ^C to abort: "
read aline
}
[ -n "$format" ] && {
[ -n "$verbose" ] && echo "Formatting $device... "
fdformat $device || exit 0
mkfs.msdos $device > /dev/null 2>/dev/null || exit 0
[ -n "$verbose" ] && echo "done."
}
rm -rf $MOUNTDIR
mkdir $MOUNTDIR || {
echo "Failed to create $MOUNTDIR" >&2
exit 1
}
[ -d $MOUNTDIR ] || {
echo "$MOUNTDIR is not a directory!" >&2
exit 1
}
mount -wt vfat $device $MOUNTDIR || {
rmdir $MOUNTDIR
exit 1
}
mkdir $MOUNTDIR/grub
[ -n "$verbose" ] && echo -n "Copying $GRUBDIR files... "
cd $GRUBDIR
cp -a stage1 stage2 grub.conf device.map splash.xpm.gz
$MOUNTDIR/grub
[ -n "$verbose" ] && echo "done."
[ -n "$verbose" ] && echo -n "Setting up GRUB... "
grub --device-map=$GRUBDIR/device.map --batch <<EOF
root (fd0)
setup (fd0)
quit
EOF
[ -n "$verbose" ] && echo "done."
umount $MOUNTDIR
rmdir $MOUNTDIR
[ -n "$verbose" ] && echo "done setting up GRUB."
echo "Edit (fd0)/grub/grub.conf to customize."
echo "May want to use splashimage=(fd0)/grub/splash.xpm.gz"
}
else
echo "$device does not exist"
fi
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