source: MondoRescue/branches/stable/mondo/src/restore-scripts/mondo/make-me-bootable

#!/bin/sh


if [ "$#" -ne "1" ] && [ "$#" -ne "2" ] ; then
    echo "make-me-bootable <fname> (dummy)"
    exit 1
fi

dummy=$2
boot_drv=""
boot_part=""
root_drv=""
root_part=""

HAVE_ACTIVE="false"
for i in `cat $1 | tr -s '\t' ' ' | cut -d' ' -f1 | grep -vE "/dev/fd|none|#"` ; do
    mountpt=`grep "$i " $1 | tr -s '\t' ' ' | cut -d' ' -f2`
    format=`grep "$i " $1 | tr -s '\t' ' ' | cut -d' ' -f3`
    drive=`echo $i | sed -e 's/[0-9]*$//' -e 's/\([0-9]\)p$/\1/'`
    partno=`echo $i | sed -e 's/^.*[^0-9]\([0-9]*\)$/\1/'`

    if [ "$HAVE_ACTIVE" = "false" ] && [ "`parted2fdisk -l $drive | tr -s '\t' ' ' | grep "$i " | grep -v "*"`" ] ; then
        if [ "$mountpt" = "/" ] ; then
            root_drv=$drive
        root_part=$partno
        elif [ "$mountpt" = "/boot" ] ; then
            boot_drv=$drive
            boot_part=$partno
        fi
    fi
done

if [ "$boot_drv" ] ; then
    drive=$boot_drv
    partno=$boot_part
elif [ "$root_drv" ] ; then
    drive=$root_drv
    partno=$root_part
else
    driveline=`grep -E '[   ]/boot[     ]' $1`
    [ ! "$driveline" ] && driveline=`grep -E '[     ]/[     ]' $1`
    partno=`echo "$driveline" | cut -d' ' -f1 | awk -F "[a-z]" '{print $NF;}'`
#    echo "driveline=$driveline --> partno=$partno"
fi

if [ "$drive" ] ; then
    if [ "$dummy" != "" ] ; then
        if [ "$partno" = "0" ] || [ ! "$partno" ] ; then
        partno="1"
    fi
        echo "$partno"
    else
        echo -en "a\n$partno\nw\n" | parted2fdisk $drive >> $LOGFILE 2>> $LOGFILE
    fi
fi
exit 0