219 lines
5.9 KiB
Bash
219 lines
5.9 KiB
Bash
#!/bin/sh
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#
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# $NetBSD: buildfloppies.sh,v 1.19 2018/09/16 21:49:18 kre 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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#
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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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etcdir=/etc
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usage()
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{
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cat 1>&2 << _USAGE_
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Usage: ${prog} [options] base size file [...]
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-i instboot eval instboot as a shell command to install a
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bootstrap. @IMAGE@ is replaced with with the
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file name of the floppy image.
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-m max maximum number of floppies to build
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-N etcdir directory in which to find passwd and group files.
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-p pad last floppy to floppy size
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-s suffix suffix for floppies
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-t timestamp set timestamp for reproducible builds
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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 store in the floppies
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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:N:ps:t: 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=${OPTARG} ;;
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N)
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etcdir=${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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t)
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timestamp="--timestamp ${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} # XXX breaks if maxdisks > 9
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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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(
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echo ". type=dir optional"
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for f in ${files}; do
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echo "./$f type=file uname=root gname=wheel mode=0444"
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done
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) | \
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${PAX} ${timestamp} -O -w -b8k -M -N "${etcdir}" -s,^./,, >> ${floppy} || exit 1
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# install bootstrap before the image is split into multiple disks
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#
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if [ -n "$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=${numdisks}
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fi
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# Try to accurately summarise free space
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#
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msg=
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# First floppy has 8k boot code, the rest an 8k 'multivolume header'.
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# Each file has a 512 byte header and is rounded to a multiple of 512.
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# The archive ends with two 512 byte blocks of zeros.
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# The output file is then rounded up to a multiple of 8k.
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# floppysize is in units of 512-byte blocks; free_space is in bytes.
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free_space=$(($maxdisks * ($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 - $file_bytes))
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if [ "$file_bytes" != 0 ] || [ "$file" = "${file#USTAR.volsize.}" ]
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then
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msg="$msg $file $pad_bytes,"
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fi
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free_space=$(($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} # XXX breaks if maxdisks > 9
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exit 0
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