0437903aaf
per floppy for a while. (The rest of the sums are ok). Change the 'padded' size to include all the space in the last 8k block of the tar file. Similarly if the image doesn't fit, report the exact amount of overflow.
206 lines
5.8 KiB
Bash
206 lines
5.8 KiB
Bash
#!/bin/sh
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#
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# $NetBSD: buildfloppies.sh,v 1.12 2005/09/10 18:05:51 dsl Exp $
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#
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# Copyright (c) 2002-2003 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] [-s suffix] 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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-s suffix suffix for floppies
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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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roundup()
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{
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echo $(( ( $1 + $2 - 1 ) / ( $2 ) ))
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}
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# parse and check arguments
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#
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while getopts i:m:ps: 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=${OPTARG} ;;
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p)
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pad=1 ;;
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s)
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suffix=${OPTARG} ;;
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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 ${floppybase}?${suffix}
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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} -O -w -b8k ${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} || exit 1
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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 -ln $floppy)
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bytes=$5
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blocks=$(roundup ${bytes} 512)
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# when calculating numdisks, take into account:
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# a) the image already has an 8K tar header prepended
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# b) each floppy needs an 8K tar volume header
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numdisks=$(roundup ${blocks}-16 ${floppysize}-16)
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if [ -z "${maxdisks}" ]; then
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maxdisks=${numdisks}
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fi
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# Try to accurately summarise free space
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#
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msg=
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# First floppy has 8k boot code, the rest an 8k 'multivolume header'
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# Each file has a 512 byte header and is rounded to a multiple of 512
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# The archive ends with two 512 byte blocks of zeros
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# The output file is then rounded up to a multiple of 8k
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free_space=$(($maxdisks * ($floppysize - 16) * 512 - 512 * 2))
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for file in $files; do
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set -- $(ls -ln $file)
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file_bytes=$5
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pad_bytes=$(($(roundup $file_bytes 512) * 512 - $file_bytes))
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[ "$file_bytes" != 0 -o "$file" = "${file#USTAR.volsize.}" ] &&
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msg="$msg $file $pad_bytes,"
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free_space=$(($free_space - 512 - $file_bytes - $pad_bytes))
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done
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echo "Free space in last tar block:$msg"
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if [ ${numdisks} -gt ${maxdisks} ]; then
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# Add in the size of the last item (we really want the kernel) ...
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excess=$(( 0 - $free_space + $pad_bytes))
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echo 1>&2 \
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"$prog: Image is ${excess} bytes ($(( ${excess} / 1024 )) KB)"\
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"too big to fit on ${maxdisks} disk"$(plural ${maxdisks})
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exit 1
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fi
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padto=$(( ${floppysize} * ${maxdisks} ))
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if [ -n "${pad}" ]; then
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echo \
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"Writing $(( ${padto} * 512 )) bytes ($(( ${padto} / 2 )) KB)" \
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"on ${numdisks} disk"$(plural ${numdisks})"," \
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"padded by ${free_space} bytes" \
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"($(( ${free_space} / 1024 )) 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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"free space ${free_space} bytes" \
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"($(( ${free_space} / 1024 )) KB)"
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fi
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# write disks
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#
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curdisk=1
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image=
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seek=0
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skip=0
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floppysize8k=$(( ${floppysize} / 16 ))
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while [ ${curdisk} -le ${numdisks} ]; do
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image="${floppybase}${curdisk}${suffix}"
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echo "Creating disk ${curdisk} to ${image}"
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if [ ${curdisk} -eq 1 ]; then
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: > ${image}
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else
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echo USTARFS ${curdisk} > ${image}
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fi
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count=$(( ${floppysize8k} - ${seek} ))
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dd bs=8k conv=sync seek=${seek} skip=${skip} count=${count} \
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if=${floppy} of=${image} 2>/dev/null
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curdisk=$(( ${curdisk} + 1 ))
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skip=$(( $skip + $count ))
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seek=1
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done
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# pad last disk if necessary
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#
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if [ -n "${pad}" ]; then
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dd if=$image of=$image conv=notrunc conv=sync bs=${floppysize}b count=1
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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 ${floppybase}?${suffix}
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exit 0
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