#!/bin/sh
#
# Bacula interface to mtx autoloader
#
#  $Id$
#
#  If you set in your Device resource
#
#  Changer Command = "path-to-this-script/mtx-changer" %c %o %S %a
#    you will have the following input to this script:
#
#  mtx-changer "changer-device" "command" "slot" "archive-device"
#
#  for example:
#
#  mtx-changer /dev/sg0 load 1 /dev/nst0 (on a Linux system)
#
#  If you need to to an offline, refer to the drive as $4
#    e.g.   mt -f $f offline
#
#  Many changers need an offline after the unload. Also many
#   changers need a sleep 60 after the mtx load.
#
#  N.B. If you change the script, take care to return either 
#   the mtx exit code or a 0. If the script exits with a non-zero
#   exit code, Bacula will assume the request failed.
#

MTX=@MTX@

case "$2" in 
   unload)
#     echo "Doing mtx -f $1 unload"
#
# enable the following line if you need to eject the cartridge
#     mt -f $4 offline
      ${MTX} -f $1 unload
      ;;

   load)
#     echo "Doing mtx -f $1 load $3"
      ${MTX} -f $1 load $3
      rtn=$?
#
# Increase the sleep time if you have a slow device
      sleep 15
      exit $rtn
      ;;

   list) 
#     echo "Requested list"
      ${MTX} -f $1 status | grep " *Storage Element [0-9]*:.*Full" | awk "{print \$3 \$4}" | sed "s/Full *\(:VolumeTag=\)*//"
      ;;

   loaded)
#     echo "Request loaded"
      ${MTX} -f $1 status >/tmp/mtx.$$
      rtn=$?
      cat /tmp/mtx.$$ | grep "^Data Transfer Element 0:Full" | awk "{print \$7}"
      cat /tmp/mtx.$$ | grep "^Data Transfer Element 0:Empty" | awk "{print 0}"
      rm -f /tmp/mtx.$$
      exit $rtn
      ;;

   slots)
#     echo "Request slots"
      ${MTX} -f $1 status | grep " *Storage Changer" | awk "{print \$5}"
      ;;
esac