bacula-autochanger-onetapedrive.sh

#!/bin/sh
#
# Bacula interface to mtx autoloader
#
# Created  OCT/31/03 by Alexander Kuehn, derived from Ludwig Jaffe's script
#
# *Heavily* hacked between 31/10/07 & 02/11/07 by Sean Cardus to make it work
# with the current Bacula version & our LTO tape drive.  This works for me,
# it might work for you too - But, don't blame me if it blows up :)
#
# John Murray added storagename feature on 6th Nov 2007 to cater for situation
# where more than one Storage resource exists - we need to supply the correct
# qualifier after 'status Storage'
#
# * Check that the bacula-sd process has permission to run this script, 
#   run bconsole and to write to the logfile specified below! *
#
#set -x
# these are the labels of the tapes in each virtual slot, not the slots!
labels="DC01 DC02 DC03 DC04 DC05 DC06 DC07 DC08 DC09 DC10"

# If more than one Storage resource exists, specify which to check status
# of (name is case-sensitive)
# e.g.
#   storagename="Tape"
storagename=""

# who to send a mail to?
recipient=operator@my.domain.name
logfile=/var/log/mtx.log

# Delay in seconds how often to check whether a new tape has been inserted
TAPEDELAY=10    # the default is every 10 seconds
echo `date` ":" $@ >>$logfile

# change this if mt is not in the path (use different quotes!)
mt=`which mt`
grep=`which grep`
#
# how to run the console application?
console="/usr/sbin/bconsole -c /etc/bacula/bconsole.conf"

command="$1"

#TAPEDRIVE0 holds the device/name of your 1st and only drive (Bacula supports only 1 drive currently)
#Read TAPEDRIVE from command line parameters
if [ -z "$2" ] ; then
  TAPEDRIVE0=/dev/nst0
else
  TAPEDRIVE0=$2
fi

#Read slot from command line parameters
if [ -z "$3" ] ; then
  slot=`expr 1`
else
  slot=`expr $3`
fi

if [ -z "$command" ] ; then
  echo ""
  echo "The mtx-changer script for Bacula"
  echo "---------------------------------"
  echo ""
  echo "usage: mtx-changer <command> <devicename of tapedrive> [slot]"
  echo "       mtx-changer"
  echo ""
  echo "Valid commands:"
  echo ""
  echo "unload          Unloads a tape into the slot"
  echo "                from where it was loaded."
  echo "load <slot>     Loads a tape from the slot <slot>"
  echo "list            Lists full storage slots"
  echo "loaded          Gives slot from where the tape was loaded."
  echo "                0 means the tape drive is empty."
  echo "slots           Gives Number of avialable slots." 
  echo "volumes         List avialable slots and the label of the." 
  echo "                tape in it (slot:volume)"
  echo "Example:"
  echo "  mtx-changer load /dev/nst0 1   loads a tape from slot1"
  echo "  mtx-changer %a %o %S   "
  echo ""
  exit 0
fi

case "$command" in
  unload)
    echo "mtx-changer: Unload request on $TAPEDRIVE0" >>$logfile

    DRIVESTATUS=`$mt -f $TAPEDRIVE0 status | grep ONLINE`
    echo "DriveStatus: $DRIVESTATUS" >>$logfile
    if [ -z $DRIVESTATUS ] ; then
      echo "Drive is OFFLINE" >>$logfile
    else
      echo "Drive is ONLINE" >>$logfile
      echo "Taking drive offline and ejecting..." >>$logfile
      mt -f $TAPEDRIVE0 rewoffl 2>/dev/null
    fi

    exit 0
    ;;

  load)
    echo "mtx-changer: load request on $TAPEDRIVE0" >>$logfile

    #Let's check if drive is loaded before we load it
    MOUNTED=`echo "status Storage=$storagename" | $console | $grep $TAPEDRIVE0 | $grep "is mounted with"`
    if [ -z "$MOUNTED" ] ; then
      echo "Drive is UNMOUNTED: $MOUNTED" >>$logfile
    else
      echo "Drive is MOUNTED: $MOUNTED" >>$logfile
      VOLUME=`echo "status Storage=$storagename" | $console | $grep -A2 $TAPEDRIVE0 | $grep "Volume:" | awk {'print $2'}`
      echo "Mounted Volume: $VOLUME" >>$logfile
      if [ $MOUNTED = $3 ] ; then
        echo "$3 is already mounted in $TAPEDRIVE0 as $VOLUME" >>$logfile
        exit
      else
        echo "$VOLUME is currently mounted in $TAPEDRIVE0, unmounting..." >>$logfile
        echo "unmount" | $console >/dev/null 2>/dev/null
      fi
    fi

    echo "Taking drive offline and ejecting..." >>$logfile
    mt -f $TAPEDRIVE0 rewoffl 2>/dev/null

    # extract label for the mail
    count=`expr 1`
    for label in $labels ; do
      if [ $slot -eq $count ] ; then volume=$label ; fi
      count=`expr $count + 1`
    done

    mail -s "Bacula needs volume $volume." $recipient <<END_OF_DATA
Please insert tape labelled $volume from slot $slot into $TAPEDRIVE0.
Kind regards,
Bacula.
END_OF_DATA

    sleep $TAPEDELAY

    # Wait for the tape to be inserted
    STATUS=`$mt -f $TAPEDRIVE0 status | $grep ONLINE`
    while [ -z "$STATUS" ] ; do
      sleep $TAPEDELAY
      STATUS=`$mt -f $TAPEDRIVE0 status | $grep ONLINE`
    done

    mail -s "Bacula says thank you." $recipient <<END_OF_DATA
Thank you for inserting the new tape! (I requested volume $volume from slot $slot.)
Kind regards,
Bacula.
END_OF_DATA

    echo "Successfully loaded a tape into drive $TAPEDRIVE0 (requested $volume from slot $slot)." >>$logfile
    echo "Loading finished." ; >>$logfile
    echo "$slot"
    exit 0
    ;;

  list)
    echo "mtx-changer: Requested list" >>$logfile
    count=`expr 1`
    for label in $labels ; do
      echo $count:$label 
      count=`expr $count + 1`
    done
    printf "\n"
    ;;

  loaded)
    echo "mtx-changer: tape loaded request on $TAPEDRIVE0" >>$logfile

    DRIVESTATUS=`mt -f $TAPEDRIVE0 status 2>/dev/null`
    MTRTN=$?
    if [ $MTRTN = "0" ] ; then
      echo "MT ran ok.  Return Code: $MTRTN" >>$logfile
      DRIVESTATUS=`mt -f $TAPEDRIVE0 status | grep "DR_OPEN"`
      if [ -z "$DRIVESTATUS"] ; then
        echo "MT says the drive has a tape" >>$logfile
        echo "0"
      else
        echo "MT says the drive is empty" >>$logfile
        echo "0"
      fi
    else
      echo "MT error, bacula might be using it! Return code: $MTRTN" >>$logfile

      MOUNTED=`echo "status Storage=$storagename" | $console | $grep $TAPEDRIVE0 | $grep "is mounted with"`
      if [ -z "$MOUNTED" ] ; then
        echo "Drive is UNMOUNTED: $MOUNTED">>$logfile
        echo "0"
      else
        echo "Drive is MOUNTED: $MOUNTED">>$logfile
        VOLUME=`echo "status Storage=$storagename" | $console | $grep -A2 $TAPEDRIVE0 | $grep "Volume:" | awk {'print $2'}`
        echo "Mounted Volume: $VOLUME" >>$logfile
        count=`expr 1`
        for label in $labels ; do
          if [ $VOLUME = $label ] ; then
            echo "$VOLUME = $label in slot $count" >>$logfile
            echo "$count"
          fi
          count=`expr $count + 1`
        done
      fi
    fi
    exit 0
    ;;

  slots)
    echo "mtx-changer: Request slots" >>$logfile
    count=`expr 0`
    for label in $labels ; do
      count=`expr $count + 1`
    done
    echo $count
    ;;

  volumes)
    echo "mtx-changer: Request volumes" >>$logfile
    count=`expr 1`
    for label in $labels ; do
      printf "$count:$label"
      count=`expr $count + 1`
    done
    printf "\n"
    ;;
esac