#!/bin/bsh
#
# Written by:
#   Brent L. Bates
#   ViGYAN, Inc.
#   30 Research Drive
#   Hampton, VA 23666-2315
#   blbates@vigyan.com
#
#set -x
#set -v
if [ ${#} -ne 2 ]; then
   echo "Useage: $0 hostname tape_number"
   exit
fi

TAPELABEL='Backups:ViGYAN:'$1':Tape_'$2':Level_0'

TAPEHOST_OS=`uname -s`
if [ ${TAPEHOST_OS} = 'IRIX' -o ${TAPEHOST_OS} = 'IRIX64' ]; then
   #
   # SGI
   #
   TAPE=/dev/nrtapec
   TAPE_STATUS='mt -f ${TAPE} status 2>&1 | grep Media |sed -e "s/^.*Media.*:[ 	]*//" |sed -e "s/[ 	][ 	]*.*//'
   UNLOAD='mt -f ${TAPE} rewind ; mt -f ${TAPE} offline ; if [ `eval ${TAPE_STATUS}` != 'Not' ]; then  mt -f ${TAPE} unload; fi'
   if [ x`eval ${TAPE_STATUS}` != 'xNot' ]; then
      #
      #    Partition Tape
      #
      mt -f ${TAPE} rewind
      mt -f ${TAPE} mkpart 1
      #
      # Move to header partition
      #
      mt -f ${TAPE} sppart 1
      mt -f ${TAPE} rewind
      TAPE_UNLOADED="No"
   else
      echo "No tape loaded."
      TAPE_UNLOADED="Yes"
   fi
elif [ ${TAPEHOST_OS} = 'Linux' ]; then
   #
   # Linux
   #
   TAPE=/dev/nst0
   TAPE_STATUS='mt -f ${TAPE} status 2>&1 | grep DR_OPEN |tr "[\ ]" "[\n]" |grep DR_OPEN'
   UNLOAD='echo "Rewinding Tape." ; mt -f ${TAPE} rewind ; echo "Offlining Tape." ; mt -f ${TAPE} offline ; if [ 'x'`eval ${TAPE_STATUS}` != 'xDR_OPEN' ]; then mt -f ${TAPE} offline; fi'
   if [ x`eval ${TAPE_STATUS}` != 'xDR_OPEN' ]; then
      #
      #    Make sure tape drive is in proper mode.
      #
      echo "Rewinding Tape."
      mt -f ${TAPE} rewind
      echo "Setting tape parameters: stsetoptions scsi2logical can-partitions"
      mt -f ${TAPE} stsetoptions scsi2logical can-partitions
      echo "Clearing tape parameters: stclearoptions async-writes"
      mt -f ${TAPE} stclearoptions async-writes
      echo "Setting: setblk 0 (Variable block size)"
      mt -f ${TAPE} setblk 0
      echo "Setting: defcompression 1"
      mt -f ${TAPE} defcompression 1
      if [ `uname -r` = '2.2.14-12' ]; then
         echo "Setting: datcompression 1"
         mt -f ${TAPE} datcompression 1
      fi
      echo "Setting: compression 1"
      mt -f ${TAPE} compression
      #
      #    Partition Tape
      #
      echo "Making partition."
      mt -f ${TAPE} mkpartition 1
      #
      #    Move to header partition
      #
      echo "Moving to partition 1."
      mt -f ${TAPE} setpartition 1
      echo "Rewinding Tape."
      mt -f ${TAPE} rewind
      TAPE_UNLOADED="No"
   else
      echo "No tape loaded."
      TAPE_UNLOADED="Yes"
   fi
else
   #
   # SunOS
   #
   TAPE=/dev/exabyte
   UNLOAD="mt -f ${TAPE} rewind; mt -f ${TAPE} offline"
   mt -f ${TAPE} rewind
fi

if [ ${TAPE_UNLOADED} != 'Yes' ]; then
   #
   # Lable Tape
   #
   echo $TAPELABEL | dd of=${TAPE} bs=1k cbs=1k conv=block
   
   mt -f $TAPE rewind
   
   #
   # Check Lable
   #
   dd if=${TAPE} bs=1k cbs=1k conv=unblock

   eval ${UNLOAD}
fi