source: bootcd/isolinux/syslinux-6.03/gpxe/src/util/gensdsk

#!/bin/bash
#
# Generate a syslinux floppy that loads a gPXE image
#
# gensdsk foo.sdsk foo.lkrn
#
# the floppy image is the first argument
#   followed by list of .lkrn images
#

case $# in
0|1)
        echo Usage: $0 foo.sdsk foo.lkrn ...
        exit 1
        ;;
esac
case "`mtools -V`" in
Mtools\ version\ 3.9.9*|Mtools\ version\ 3.9.1[0-9]*|[mM]tools\ *\ [4-9].*)
        ;;
*)
        echo Mtools version 3.9.9 or later is required
        exit 1
        ;;
esac
img=$1
shift
dir=`mktemp -d bin/sdsk.dir.XXXXXX`

mformat -f 1440 -C -i $img ::
cfg=$dir/syslinux.cfg
cat > $cfg <<EOF

# These default options can be changed in the gensdsk script
TIMEOUT 30
EOF
first=
for f
do
        if [ ! -r $f ]
        then
                echo $f does not exist, skipping 1>&2
                continue
        fi
        # shorten name for 8.3 filesystem
        b=$(basename $f)
        g=${b%.lkrn}
        g=${g//[^a-z0-9]}
        g=${g:0:8}.krn
        case "$first" in
        "")
                echo DEFAULT $g
                ;;
        esac
        first=$g
        echo LABEL $b
        echo "" KERNEL $g
        mcopy -m -i $img $f ::$g
done >> $cfg
mcopy -i $img $cfg ::syslinux.cfg
if ! syslinux $img
then
        exit 1
fi

rm -fr $dir