distrib/common/buildfloppies.sh

   1 #!/bin/sh
   2 #
   3 # $NetBSD: buildfloppies.sh,v 1.17 2008/11/12 14:22:16 apb Exp $
   4 #
   5 # Copyright (c) 2002-2003 The NetBSD Foundation, Inc.
   6 # All rights reserved.
   7 #
   8 # This code is derived from software contributed to The NetBSD Foundation
   9 # by Luke Mewburn of Wasabi Systems.
  10 #
  11 # Redistribution and use in source and binary forms, with or without
  12 # modification, are permitted provided that the following conditions
  13 # are met:
  14 # 1. Redistributions of source code must retain the above copyright
  15 #    notice, this list of conditions and the following disclaimer.
  16 # 2. Redistributions in binary form must reproduce the above copyright
  17 #    notice, this list of conditions and the following disclaimer in the
  18 #    documentation and/or other materials provided with the distribution.
  19 #
  20 # THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  21 # ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  22 # TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23 # PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  24 # BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25 # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26 # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27 # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28 # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29 # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30 # POSSIBILITY OF SUCH DAMAGE.
  31 #
  32
  33 # set defaults
  34 #
  35 : ${PAX=pax}
  36 prog=${0##*/}
  37 etcdir=/etc
  38
  39
  40 usage()
  41 {
  42         cat 1>&2 << _USAGE_
  43 Usage: ${prog} [options] base size file [...]
  44         -i instboot     eval instboot as a shell command to install a
  45                         bootstrap.  @IMAGE@ is replaced with with the
  46                         file name of the floppy image.
  47         -m max          maximum number of floppies to build
  48         -N etcdir       directory in which to find passwd and group files.
  49         -p              pad last floppy to floppy size
  50         -s suffix       suffix for floppies
  51         base            basename of generated floppies
  52         size            size of a floppy in 512 byte blocks
  53         file [...]      file(s) to store in the floppies
  54 _USAGE_
  55         exit 1
  56 }
  57
  58 plural()
  59 {
  60         [ $1 -ne 1 ] && echo "s"
  61 }
  62
  63 roundup()
  64 {
  65         echo $(( ( $1 + $2 - 1 ) / ( $2 ) ))
  66 }
  67
  68
  69 #       parse and check arguments
  70 #
  71
  72 while getopts i:m:N:ps: opt; do
  73         case ${opt} in
  74         i)
  75                 instboot=${OPTARG} ;;
  76         m)
  77                 maxdisks=${OPTARG} ;;
  78         N)
  79                 etcdir=${OPTARG} ;;
  80         p)
  81                 pad=1 ;;
  82         s)
  83                 suffix=${OPTARG} ;;
  84         \?|*)
  85                 usage
  86                 ;;
  87         esac
  88 done
  89
  90 shift $(( ${OPTIND} - 1 ))
  91 [ $# -lt 3 ] && usage
  92 floppybase=$1
  93 floppysize=$2
  94 shift 2
  95 files=$*
  96
  97 #       setup temp file, remove existing images
  98 #
  99 floppy=floppy.$$.tar
 100 trap "rm -f ${floppy}" 0 1 2 3                  # EXIT HUP INT QUIT
 101 rm -f ${floppybase}?${suffix}                   # XXX breaks if maxdisks > 9
 102
 103 #       create tar file
 104 #
 105 dd if=/dev/zero of=${floppy} bs=8k count=1 2>/dev/null
 106 (
 107         echo ". type=dir optional"
 108         for f in ${files}; do
 109                 echo "./$f type=file uname=root gname=wheel mode=0444"
 110         done
 111 ) | \
 112 ${PAX} -O -w -b8k -M -N "${etcdir}" -s,^./,, >> ${floppy} || exit 1
 113
 114 #       install bootstrap before the image is split into multiple disks
 115 #
 116 if [ -n "$instboot" ]; then
 117         instboot=$( echo $instboot | sed -e s/@IMAGE@/${floppy}/ )
 118         echo "Running instboot: ${instboot}"
 119         eval ${instboot} || exit 1
 120 fi
 121
 122 #       check size against available number of disks
 123 #
 124 set -- $(ls -ln $floppy)
 125 bytes=$5
 126 blocks=$(roundup ${bytes} 512)
 127         # when calculating numdisks, take into account:
 128         #       a) the image already has an 8K tar header prepended
 129         #       b) each floppy needs an 8K tar volume header
 130 numdisks=$(roundup ${blocks}-16 ${floppysize}-16)
 131 if [ -z "${maxdisks}" ]; then
 132         maxdisks=${numdisks}
 133 fi
 134
 135 #       Try to accurately summarise free space
 136 #
 137 msg=
 138 # First floppy has 8k boot code, the rest an 8k 'multivolume header'.
 139 # Each file has a 512 byte header and is rounded to a multiple of 512.
 140 # The archive ends with two 512 byte blocks of zeros.
 141 # The output file is then rounded up to a multiple of 8k.
 142 # floppysize is in units of 512-byte blocks; free_space is in bytes.
 143 free_space=$(($maxdisks * ($floppysize - 16) * 512 - 512 * 2))
 144 for file in $files; do
 145         set -- $(ls -ln $file)
 146         file_bytes=$5
 147         pad_bytes=$(($(roundup $file_bytes 512) * 512 - $file_bytes))
 148         [ "$file_bytes" != 0 -o "$file" = "${file#USTAR.volsize.}" ] &&
 149                 msg="$msg $file $pad_bytes,"
 150         free_space=$(($free_space - 512 - $file_bytes - $pad_bytes))
 151 done
 152 echo "Free space in last tar block:$msg"
 153
 154 if [ ${numdisks} -gt ${maxdisks} ]; then
 155         # Add in the size of the last item (we really want the kernel) ...
 156         excess=$(( 0 - $free_space + $pad_bytes))
 157         echo 1>&2 \
 158             "$prog: Image is ${excess} bytes ($(( ${excess} / 1024 )) KB)"\
 159             "too big to fit on ${maxdisks} disk"$(plural ${maxdisks})
 160         exit 1
 161 fi
 162
 163 padto=$(( ${floppysize} * ${maxdisks} ))
 164 if [ -n "${pad}" ]; then
 165         echo \
 166             "Writing $(( ${padto} * 512 )) bytes ($(( ${padto} / 2 )) KB)" \
 167             "on ${numdisks} disk"$(plural ${numdisks})"," \
 168             "padded by ${free_space} bytes" \
 169             "($(( ${free_space} / 1024 )) KB)"
 170 else
 171         echo "Writing ${bytes} bytes ($(( ${blocks} / 2 )) KB)"\
 172             "on ${numdisks} disk"$(plural ${numdisks})"," \
 173             "free space ${free_space} bytes" \
 174             "($(( ${free_space} / 1024 )) KB)"
 175 fi
 176
 177 #       write disks
 178 #
 179 curdisk=1
 180 image=
 181 seek=0
 182 skip=0
 183 floppysize8k=$(( ${floppysize} / 16 ))
 184 while [ ${curdisk} -le ${numdisks} ]; do
 185         image="${floppybase}${curdisk}${suffix}"
 186         echo "Creating disk ${curdisk} to ${image}"
 187         if [ ${curdisk} -eq 1 ]; then
 188                 : > ${image}
 189         else
 190                 echo USTARFS ${curdisk} > ${image}
 191         fi
 192         count=$(( ${floppysize8k} - ${seek} ))
 193         dd bs=8k conv=sync seek=${seek} skip=${skip} count=${count} \
 194             if=${floppy} of=${image} 2>/dev/null
 195
 196         curdisk=$(( ${curdisk} + 1 ))
 197         skip=$(( $skip + $count ))
 198         seek=1
 199 done
 200
 201 #       pad last disk if necessary
 202 #
 203 if [ -n "${pad}" ]; then
 204         dd if=$image of=$image conv=notrunc conv=sync bs=${floppysize}b count=1
 205 fi
 206
 207
 208 #       final status
 209 #
 210 echo "Final result:"
 211 ls -l ${floppybase}?${suffix}                   # XXX breaks if maxdisks > 9
 212
 213 exit 0