Re: [CentOS] Reinstall Windows but preserve CentOS

29 Jul 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@ieee.org
#  based on mkbootdisk by Erik Troan ewt@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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Re: [CentOS] Reinstall Windows but preserve CentOS