buildfloppies.sh -- build floppy images from the given files.
It can write multiple disks (up to a maximum number), and optionally install a bootstrap or pad the last disk to the image size.
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lukem
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#!/bin/sh
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#
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# $NetBSD: buildfloppies.sh,v 1.1 2002/04/16 04:28:23 lukem Exp $
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#
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# Copyright (c) 2002 The NetBSD Foundation, Inc.
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# All rights reserved.
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#
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# This code is derived from software contributed to The NetBSD Foundation
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# by Luke Mewburn of Wasabi Systems.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. All advertising materials mentioning features or use of this software
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# must display the following acknowledgement:
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# This product includes software developed by the NetBSD
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# Foundation, Inc. and its contributors.
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# 4. Neither the name of The NetBSD Foundation nor the names of its
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# contributors may be used to endorse or promote products derived
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# from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# set defaults
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#
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: ${PAX=pax}
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prog=${0##*/}
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usage()
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{
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cat 1>&2 << _USAGE_
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Usage: ${prog} [-i instboot] [-m max] [-p] base size file [...]
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-i instboot run instboot to install a bootstrap on @IMAGE@
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-m max maximum number of floppies to build
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-p pad last floppy to floppy size
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base basename of generated floppies
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size size of a floppy in 512 byte blocks
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file [...] file(s) to build
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_USAGE_
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exit 1
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}
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plural()
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{
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[ $1 -ne 1 ] && echo "s"
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}
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# parse and check arguments
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#
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while getopts i:m:p opt; do
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case ${opt} in
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i)
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instboot=${OPTARG} ;;
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m)
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maxdisks=${OPTARG} ;;
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p)
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pad=1 ;;
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\?|*)
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usage
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;;
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esac
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done
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shift $(( ${OPTIND} - 1 ))
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[ $# -lt 3 ] && usage
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floppybase=$1
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floppysize=$2
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shift 2
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files=$*
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# setup temp file, remove existing images
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#
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floppy=floppy.$$.tar
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trap "rm -f ${floppy}" 0 1 2 3 # EXIT HUP INT QUIT
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rm -f ${floppybase}?.fs
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# create tar file
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#
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dd if=/dev/zero of=${floppy} bs=8k count=1 2>/dev/null
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${PAX} -w ${files} >> ${floppy} || exit 1
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# XXX: use pax metafile and set perms?
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if [ -n "$instboot" ]; then
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instboot=$( echo $instboot | sed -e s/@IMAGE@/${floppy}/ )
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echo "Running instboot: ${instboot}"
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eval ${instboot}
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fi
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# check size against available number of disks
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#
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set -- `ls -l ${floppy}`
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bytes=$5
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blocks=$(( ${bytes} / 512 ))
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numdisks=$(( (${blocks} - 1) / ${floppysize} + 1 ))
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if [ -z "${maxdisks}" ]; then
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maxdisks=${numdisks}
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fi
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if [ ${numdisks} -gt ${maxdisks} ]; then
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excess=$(( ( ${blocks} - ${floppysize} * ${maxdisks} ) * 512 ))
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echo 1>&2 \
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"$prog: Image is ${excess} bytes ($(( ${excess} / 1024 )) KB)"\
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"too big to fit on ${maxdisks} disk"$(plural ${maxdisks})
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exit 1
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fi
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if [ -n "${pad}" ]; then
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padsize=$(( ${floppysize} * ${maxdisks} ))
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padcount=$(( ${padsize} - ${blocks} ))
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echo \
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"Writing $(( ${padsize} * 512 )) bytes ($(( ${padsize} / 2 )) KB)" \
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"on ${numdisks} disk"$(plural ${numdisks})"," \
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"padded by $(( ${padcount} * 512 )) bytes" \
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"($(( ${padcount} / 2 )) KB)"
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else
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echo "Writing ${bytes} bytes ($(( ${blocks} / 2 )) KB)"\
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"on ${numdisks} disk"$(plural ${numdisks})
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fi
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# write disks
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#
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curdisk=1
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image=
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floppysize8k=$(( ${floppysize} / 16 ))
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while [ ${curdisk} -le ${numdisks} ]; do
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image="${floppybase}${curdisk}.fs"
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echo "Creating disk ${curdisk} to ${image}"
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if [ ${curdisk} -eq 1 ]; then
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seek=0
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skip=0
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: > ${image}
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else
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seek=1
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skip=$(( (${curdisk} - 1) * (${floppysize8k} - 1) + 1 ))
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echo USTARFS ${curdisk} > ${image}
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fi
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count=$(( ${floppysize8k} - ${seek} ))
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# echo 1>&2 " DEBUG: disk ${curdisk} seek=${seek} skip=${skip} count=${count}"
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dd bs=8k conv=sync seek=${seek} skip=${skip} count=${count} \
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if=${floppy} of=${image} 2>/dev/null
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curdisk=$(( ${curdisk} + 1 ))
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done
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#
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# XXX: the old bootfloppy generation code used to zero the last 0.5k of the
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# end of the image in single disk configs; that possibly trashed real
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# data???
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# is that functionality still required?
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#
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# pad last disk if necessary
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#
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if [ -n "${pad}" ]; then
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padseek=$(( ${floppysize} - ${padcount} ))
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# echo 1>&2 " DEBUG: padding ${image} with $(( ${padcount} * 512 )) at offset $(( ${padseek} * 512 ))"
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dd seek=${padseek} count=${padcount} \
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if=/dev/zero of=${image} 2>/dev/null
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fi
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# final status
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#
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echo "Final result:"
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ls -l ${floppybase}?.fs
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exit 0
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