source: MondoRescue/branches/2.2.2/mondo/src/restore-scripts/mondo/stabgrub-me

#!/bin/sh
#
# $Id: stabgrub-me 1315 2007-04-16 14:13:59Z bruno $
#
#####################################################################


QuitIfNotFound() {
    if [ ! -f "$1" ] ; then
    LogIt "(stabgrub-me) Where's $1? I cannot continue." 1
    exit 1
    fi
}





LocateOldFstab() {
    old_fstab=""
    old_grubconf=""
    if [ -f "/mnt/RESTORING/etc/fstab" ] ; then
        LogIt "No need for fstab search." 2
#        fstab_list=/mnt/RESTORING/etc/fstab
        old_fstab=/mnt/RESTORING/etc/fstab
        old_grubconf=/mnt/RESTORING/etc/grub.conf
        # For some distros, e.g. Debian, /etc/grub.conf is a symbolic link
        # which we need to resolve and prepend with /mnt/RESTORING because
        # we run this outside the chroot.
        if [ -L "$old_grubconf" ] ; then
            old_grubconf=/mnt/RESTORING/etc/`readlink "$old_grubconf"`
        fi  
        return 0
    elif [ -f "/mnt/cdrom/archives/CUCKOO" ] ; then
        LogIt "Because I'm cuckoo, I'll stop searching." 2
        return 1
    else
        LogIt "Looking for fstab. Please wait." 2
        fstab_list=`find /mnt/RESTORING -name fstab 2> /dev/null`
    fi
    where_they_live=""
    for curr_fstab in $fstab_list ; do
    curr_dir=`echo $curr_fstab | gawk '{i=index($0,"/fstab");print substr($0,0,i-1);}'`
    resA=$?
    curr_inetd=`find $curr_dir -name inetd.conf | grep -v "linuxconf"`
    resB=$?
    if [ "$resA" -eq "0" ] ; then
        if [ "$where_they_live" != "" ] ; then
        LogIt "Two directories found! One is $where_they_live, the other $curr_dir" 1
        LogIt "I don't know which to choose. I'll abort the search." 1
        return 1
        fi
        where_they_live=$curr_dir
    fi
    done
    if [ "$where_they_live" = "" ] ; then
    LogIt "Cannot find any folder which holds fstab _and_ inetd.conf" 1
    return 1
    fi
    old_grubconf=$where_they_live/grub.conf
    old_fstab=$where_they_live/fstab
    LogIt "GRUB and fstab found." 2
    return 0
}


BEFORE=stabgrub-me.PRE

MakeBackups() {
    local i
    LogIt "Backing up original files before modifying them..." 2
    for i in $old_grubconf $old_fstab ; do
    LogIt "Backing up $i"
        [ -e "$i" ] && [ ! -e "$i.$BEFORE" ] && cp -f $i $i.$BEFORE
    done
}


RestoreBackups() {
    LogIt "Restoring original versions of modified files..." 2
    cp -f $old_grubconf /tmp/grub.conf.ugly
    cp -f $old_fstab /tmp/fstab.ugly
    for i in $old_grubconf $old_fstab ; do
    LogIt "Restoring $i"
    [ -f "$i.$BEFORE" ] && cp -f $i.$BEFORE $i
    done
}


# --------------------------------- main -------------------------------

if [ "$#" -ne "1" ] ; then
    LogIt "stabgrub-me </dev/bootdrive>"
    exit 1
fi

bootdrive=$1

LogIt "stabgrub-me '$1' --- starting"
LocateOldFstab
old_mountlist=/tmp/mountlist.original
new_mountlist=/tmp/mountlist.txt
QuitIfNotFound $old_mountlist
QuitIfNotFound $new_mountlist
QuitIfNotFound $old_fstab
QuitIfNotFound $old_grubconf
LogIt "OK so far: I've found all the files I need." 2
new_fstab=/mnt/RESTORING/etc/fstab.NEW
new_grubconf=/mnt/RESTORING/etc/grub.conf.NEW
# change back to /tmp if /mnt/RESTORING/etc be problematic

MakeBackups

LogIt "old_mountlist = $old_mountlist"
LogIt "new_mountlist = $new_mountlist"
LogIt "old_fstab = $old_fstab"
LogIt "new_fstab = $new_fstab"
LogIt "where_they_live = $where_they_live"

LogIt "Calling hack-fstab $old_mountlist $old_fstab $new_mountlist $new_fstab"

outval=0
hack-fstab $old_mountlist $old_fstab $new_mountlist $new_fstab
res=$?
if [ "$res" -ne "0" ] ; then
    LogIt "Warning - hack-fstab failed"
    outval=$(($outval+$res))
else
    LogIt "Back from hack-fstab OK" 1
fi

if [ "$outval" -ne "0" ] ; then
    LogIt "Fstab and/or grub modifications failed" 3
    RestoreBackups
else
    LogIt "Modifications succeeded." 2
    LogIt "Copying $new_fstab over $old_fstab" 2
    cp -f $new_fstab $old_fstab
    cp -f $new_fstab /tmp/fstab
    outval=$(($outval+$?))
    LogIt "Copying over $old_grubconf" 2
    if [ -f "$new_grubconf" ] ; then
        cp -f $new_grubconf $old_grubconf
        outval=$(($outval+$?))
    fi
    if [ "$outval" -ne "0" ] ; then
    LogIt "Modifications (copying) failed. Restoring from backups." 3
    RestoreBackups
    else
    LogIt "Fstab modified ok." 2
    fi
    cd /mnt/RESTORING
#    cd $where_they_live
#    cd ..
    LogIt "Running grub..." 2
    LogIt "grub-MR $bootdrive $new_mountlist"
    grub-MR $bootdrive $new_mountlist >> $LOGFILE 2>> $LOGFILE
    grub_res=$?
    if [ "$grub_res" -ne "0" ] ; then
        LogIt "grub-install failed. Running grub-MR..."
    chroot /mnt/RESTORING grub-install '(hd0)' >> $LOGFILE 2>> $LOGFILE
        grub_res=$?
    fi
    if [ "$grub_res" -ne "0" ] ; then
    LogIt "GRUB failed." 3
    else
        LogIt "GRUB ran ok." 2
    fi
fi

if [ "$outval" -ne "0" ] ; then
    LogIt "Error(s) occurred during grub/fstab processing.              "
    LogIt "Restoring originals.                                         "
    RestoreBackups
elif [ "$grub_res" -ne "0" ] ; then
    LogIt "Fstab was modified OK but grub failed to run.                 "
    outval=$(($outval+1))
else
    LogIt "/etc/fstab was modified ok. GRUB ran ok.                      "
fi
LogIt "stabgrub-me --- leaving"
echo -en "\n\n\n"
exit $outval