examples/dump_on_cd_3/dump_disk

   1 #!/bin/sh
   2
   3 # This script dumps the specified Filesystem via dump on a CD/DVD
   4 # DISK_CAPACITY defines the capacity in MB per disk.
   5 # The script's own name $0 is passed via the -F option of dump
   6 # When using cdrecord/dvdrecord and at least for my DVD-Recorder (a PHILIPS
   7 # DVR-A03) it is necessary to define the tracksize for the next track before
   8 # the DVD is written. This is done via the -tsize option of cdrecord. Since
   9 # tsize takes its arguments in Bytes, the shell cannot compute the value
  10 # correctly anymore (value too high), so I use bc.
  11
  12 # Set this to 4300 for DVD and 650 or 700 for CD
  13 #DISK_CAPACITY=10       # testing
  14 #DISK_CAPACITY=650
  15 DISK_CAPACITY=4300
  16
  17 BSIZE="$(echo "$DISK_CAPACITY*1024" | bc -l )"
  18 TSIZE="$(echo "$DISK_CAPACITY*1024*1024" | bc -l )"
  19
  20 # This is used for testing
  21 #RECORD_BIN="dd of=/dev/null bs=1k if="
  22
  23 # This is for writing to CD with cdrtools, this uses track-at-once mode
  24 # in case cdrtools does not support disk-at-once with your burner
  25 #RECORD_BIN="/usr/bin/cdrecord dev=0,0,0 fs=64M speed=2 -eject -tao -pad -tsize=$TSIZE -data "
  26
  27 # This is for writing to DVD with cdrtools with DVD support, this has to
  28 # use disk-at-once mode.
  29 #RECORD_BIN="/usr/bin/cdrecord dev=0,0,0 fs=64M speed=2 -eject -dao -pad -tsize=$TSIZE -data "
  30
  31 # This is for writing to DVD with growisofs
  32 RECORD_BIN="/usr/bin/growisofs -Z /dev/dvd="
  33
  34 FIFO="/tmp/dump.$$.fifo"
  35 DUMP="/sbin/dump"
  36
  37 cleanup() {
  38         rm -f $FIFO
  39 }
  40
  41 error_exit() {
  42         retcode=$?
  43         echo >&2 "Error $retcode: exiting"
  44         exit $retcode
  45 }
  46
  47 trap error_exit ERR
  48
  49 write_output() {
  50         # supplied info from "dump -F":
  51         # $1 = filename
  52         # $2 = sequence number
  53         echo "Please insert disk No. $(($2+1))"
  54         ANSWER=""
  55         while [ "$ANSWER" != "y" ] ; do
  56                 echo -n "Is the disk ready? (y/n) "
  57                 read  </dev/tty ANSWER
  58                 if [ "$ANSWER" == "y" ] ; then
  59                         (${RECORD_BIN}${1}) &
  60                         return 0
  61                 elif [ "$ANSWER" == "n" ] ; then
  62                         EXIT=""
  63                         echo -n "Do you really want to exit? (y/n) "
  64                         read </dev/tty EXIT
  65                         if [ "$EXIT" == "y" ] ; then
  66                                 return 1
  67                         fi
  68                 fi
  69         done
  70 }
  71
  72 if [ "$#" = "0" ] || [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
  73         echo >&2 "Usage: $0 <dump options>"
  74         echo >&2 "See 'man dump' for dump options"
  75         echo >&2 "the dump options -F -f -B are not required and are overridden"
  76         exit 1
  77 fi
  78
  79 set -m  # We need proper job control
  80
  81 if [ "$#" = "2" ] && [ -p "$1" ]; then
  82         write_output "$@" || (kill $$ >/dev/null 2>&1; exit 1)
  83         exit 0
  84 else
  85         mkfifo $FIFO
  86         trap cleanup EXIT
  87         if write_output "$FIFO" "0"; then
  88                 if $DUMP "$@" -F "$0" -f "$FIFO" -B$BSIZE; then
  89                         echo "Waiting for background writing process to complete"
  90                         wait %                  # Wait for the background writing process
  91                 else
  92                         kill % >/dev/null 2>&1  # or kill it
  93                         exit 1
  94                 fi
  95                 exit 0
  96         else
  97                 kill % >/dev/null 2>&1  # Kill the background writing process
  98                 exit 1
  99         fi
 100 fi