Script to Erase all tapes loaded in a tape loader.

WipeTapes.sh

#!/bin/bash
#
# Description:
#       Erase all tapes loaded in a tape loader.
#       If FULL is given as parameter a full erase is done otherwise it just do a quick one.
# BUGS:
#   It should count how many drives and do that part automagically 
#      but it's hard to pair up drives with loaders when other tape drives exists also.
#   Haven't tested FULL
#
# Copyright: Peter Sjöberg <peters-src at techwiz dot ca>
# License: GPL
#
# History:
#       2004/06/15; PS - Added handling of CLN labled cleaning tapes 
#

# have to hardcode the values because of possible more then one autoloader and 1 tapes drives
# Put in full scsi target id to not get effected by changes in scsi devices.
CHANGER=/dev/scsi/sgh4-0c0i0l0
TAPE0=/dev/scsi/nsth4-0c0i4l0
TAPE1=/dev/scsi/nsth4-0c0i5l0

TYPE=${1:-Quick}

MTX=mtx
MT=mtst

[ "$TYPE" = "FULL" ] && SLEEP=60 || SLEEP=1

if [ -z "$2" ]
    then
  #wait for changer to be ready
    retry=120
    until $MTX -f $CHANGER status &>/dev/null 
      do
      let stillwaiting=$retry%10
      [ $stillwaiting -eq 0 ] && echo Waiting $retry seconds for changer to be ready
      let retry=$retry-1
      if [ $retry -gt 0 ] 
          then
          sleep 1
      else
          echo "Problem reading changer status, aborting"
          exit 1
      fi
    done
    mtxinfo=$($MTX -f $CHANGER status 2>&1 |grep -v '=CLN'|grep VolumeTag|wc -l)
    if [ "$TYPE" = "FoRCE" ]
        then
        TYPE="Quick"
        mtxinfo=0
    fi
    if [ $mtxinfo -gt 0 ]
        then
        echo "Tape barcode labels found, aborting"
        exit 2
    fi
  # Empty the drives (need to know where I'm at and to much work trying to reuse current state)
    maxtry=4   # emergency break, don't loop forever if something goes wrong
    while [ -n "$($MTX -f $CHANGER status|tr -s ' '|grep -i 'Data Transfer'|grep -iv Empty|head -1|cut -f1 -d:|cut -f4 '-d ')" -a $maxtry -gt 0 ]
      do
      drive=$($MTX -f $CHANGER status|tr -s ' '|grep -i 'Data Transfer'|grep -iv Empty|head -1|cut -f1 -d:|cut -f4 "-d ")
      slot=$($MTX -f $CHANGER status|tr -s ' '|grep -v '=CLN'|grep -i 'Storage Element'|grep -i Empty|head -1|cut -f1 -d:|cut -f4 "-d ")
#      $MT -f $TAPEDEV offline
#      sleep $STAB
      $MTX -f $CHANGER unload $slot $drive
      let maxtry=$maxtry-1
    done
  #
  # Should have some break in the while statements
  # but with several hours possible wait it's hard
  #
    tapes=$($MTX -f $CHANGER status|grep 'Storage Element'|grep -v '=CLN'|grep ':Full'|wc -l)
    echo $(date +"%Y/%m/%d-%H:%M:%S") Starting to ${TYPE}ly erase $tapes tapes in slot $($MTX -f $CHANGER status|grep 'Storage Element'|grep -v '=CLN'|grep ':Full'|tr ':' ' '|awk '{print $3}')
    [ $tapes -lt 1 -o $tapes -gt 99 ] && tapes=1
    for slot in $($MTX -f $CHANGER status|grep 'Storage Element'|grep -v '=CLN'|grep ':Full'|tr ':' ' '|awk '{print $3}')
      do
    # Find an empty drive
      drive=$($MTX -f $CHANGER status|tr -s ' '|grep -i 'Data Transfer'|grep -i Empty|head -1|cut -f1 -d:|cut -f4 "-d ")
      while [ -z "$drive" ]
        do
        sleep $SLEEP #
        drive=$($MTX -f $CHANGER status|tr -s ' '|grep -i 'Data Transfer'|grep -i Empty|head -1|cut -f1 -d:|cut -f4 "-d ")
      done
      TAPEDEV=$(eval echo \$TAPE$drive)
      echo $(date +"%Y/%m/%d-%H:%M:%S") Loading slot $slot to drive $drive
      $MTX -f $CHANGER load $slot $drive
      echo $(date +"%Y/%m/%d-%H:%M:%S") $TYPE erase drive $drive
      $0 $TYPE $TAPEDEV $CHANGER $slot $drive &
    done

# Wait for all to finish
    NoDrives=$($MTX -f $CHANGER status|tr -s ' '|grep -i 'Data Transfer'|wc -l)
    while [ $($MTX -f $CHANGER status|tr -s ' '|grep -i 'Data Transfer'|grep -i Empty|wc -l) -ne $NoDrives ]
      do
      sleep 1
    done
    echo $(date +"%Y/%m/%d-%H:%M:%S") All tapes ${TYPE}ly erased
else
    TYPE=$1
    TAPEDEV=$2
    CHANGER=$3
    slot=$4
    drive=$5
    STAB=2      # How many seconds to wait after commands, needed to get proper state.
    while ! $MT -f $TAPEDEV status|grep -q ONLINE
      do
      sleep $SLEEP
    done
  # Always write weof so if a tape previous used at lower capacity is readjusted to max
    $MT -f $TAPEDEV weof
    sleep $STAB
    if [ "$TYPE" = "FULL" ]
        then
        $MT -f $TAPEDEV rewind
        sleep $STAB
        $MT -f $TAPEDEV erase
        sleep $STAB
        $MT -f $TAPEDEV rewind
        sleep $STAB
        $MT -f $TAPEDEV weof
        sleep $STAB
        $MT -f $TAPEDEV rewind
        sleep $STAB
    fi
#    $MT -f $TAPEDEV offline
#    sleep $STAB
    $MTX -f $CHANGER unload $slot $drive
    sleep $STAB
fi