NetBSD/distrib/common/buildfloppies.sh

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#!/bin/sh
#
# $NetBSD: buildfloppies.sh,v 1.6 2003/03/07 09:33:53 lukem Exp $
#
# Copyright (c) 2002-2003 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Luke Mewburn of Wasabi Systems.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
# must display the following acknowledgement:
# This product includes software developed by the NetBSD
# Foundation, Inc. and its contributors.
# 4. Neither the name of The NetBSD Foundation nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# set defaults
#
: ${PAX=pax}
prog=${0##*/}
usage()
{
cat 1>&2 << _USAGE_
Usage: ${prog} [-i instboot] [-m max] [-p] [-s suffix] base size file [...]
-i instboot run instboot to install a bootstrap on @IMAGE@
-m max maximum number of floppies to build
-p pad last floppy to floppy size
-s suffix suffix for floppies
base basename of generated floppies
size size of a floppy in 512 byte blocks
file [...] file(s) to build
_USAGE_
exit 1
}
plural()
{
[ $1 -ne 1 ] && echo "s"
}
# parse and check arguments
#
while getopts i:m:ps: opt; do
case ${opt} in
i)
instboot=${OPTARG} ;;
m)
maxdisks=${OPTARG} ;;
p)
pad=1 ;;
s)
suffix=${OPTARG} ;;
\?|*)
usage
;;
esac
done
shift $(( ${OPTIND} - 1 ))
[ $# -lt 3 ] && usage
floppybase=$1
floppysize=$2
shift 2
files=$*
# setup temp file, remove existing images
#
floppy=floppy.$$.tar
trap "rm -f ${floppy}" 0 1 2 3 # EXIT HUP INT QUIT
rm -f ${floppybase}?${suffix}
# create tar file
#
dd if=/dev/zero of=${floppy} bs=8k count=1 2>/dev/null
${PAX} -O -w ${files} >> ${floppy} || exit 1
# XXX: use pax metafile and set perms?
if [ -n "$instboot" ]; then
instboot=$( echo $instboot | sed -e s/@IMAGE@/${floppy}/ )
echo "Running instboot: ${instboot}"
eval ${instboot} || exit 1
fi
# check size against available number of disks
#
bytes=$( ls -l "${floppy}" | awk '{print $5}' )
blocks=$(( ${bytes} / 512 ))
numdisks=$(( ( ${blocks} + ${floppysize} - 1 ) / ${floppysize} ))
if [ -z "${maxdisks}" ]; then
maxdisks=${numdisks}
fi
if [ ${numdisks} -gt ${maxdisks} ]; then
excess=$(( ( ${blocks} - ${floppysize} * ${maxdisks} ) * 512 ))
echo 1>&2 \
"$prog: Image is ${excess} bytes ($(( ${excess} / 1024 )) KB)"\
"too big to fit on ${maxdisks} disk"$(plural ${maxdisks})
exit 1
fi
padsize=$(( ${floppysize} * ${maxdisks} ))
padcount=$(( ${padsize} - ${blocks} ))
if [ -n "${pad}" ]; then
echo \
"Writing $(( ${padsize} * 512 )) bytes ($(( ${padsize} / 2 )) KB)" \
"on ${numdisks} disk"$(plural ${numdisks})"," \
"padded by $(( ${padcount} * 512 )) bytes" \
"($(( ${padcount} / 2 )) KB)"
else
echo "Writing ${bytes} bytes ($(( ${blocks} / 2 )) KB)"\
"on ${numdisks} disk"$(plural ${numdisks})"," \
"free space $(( ${padcount} * 512 )) bytes" \
"($(( ${padcount} / 2 )) KB)"
fi
# write disks
#
curdisk=1
image=
floppysize8k=$(( ${floppysize} / 16 ))
while [ ${curdisk} -le ${numdisks} ]; do
image="${floppybase}${curdisk}${suffix}"
echo "Creating disk ${curdisk} to ${image}"
if [ ${curdisk} -eq 1 ]; then
seek=0
skip=0
: > ${image}
else
seek=1
skip=$(( (${curdisk} - 1) * (${floppysize8k} - 1) + 1 ))
echo USTARFS ${curdisk} > ${image}
fi
count=$(( ${floppysize8k} - ${seek} ))
# echo 1>&2 " DEBUG: disk ${curdisk} seek=${seek} skip=${skip} count=${count}"
dd bs=8k conv=sync seek=${seek} skip=${skip} count=${count} \
if=${floppy} of=${image} 2>/dev/null
curdisk=$(( ${curdisk} + 1 ))
done
#
# XXX: the old bootfloppy generation code used to zero the last 0.5k of the
# end of the image in single disk configs; that possibly trashed real
# data???
# is that functionality still required?
#
# pad last disk if necessary
#
if [ -n "${pad}" ]; then
padseek=$(( ${floppysize} - ${padcount} ))
# echo 1>&2 " DEBUG: padding ${image} with $(( ${padcount} * 512 )) at offset $(( ${padseek} * 512 ))"
dd seek=${padseek} count=${padcount} \
if=/dev/zero of=${image} 2>/dev/null
fi
# final status
#
echo "Final result:"
ls -l ${floppybase}?${suffix}
exit 0