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#!/bin/sh
#
# Bacula interface to mtx autoloader
# (By Lars Köller, lars+bacula@koellers.net)
#
# If you set in your Device resource
#
# Changer Command = "path-to-this-script/chio-bacula" %c %o %S %a
# you will have the following input to this script:
#
# chio-bacula "changer-device" "command" "slot" "archive-device"
#
# for example:
#
# chio-bacula /dev/sg0 load 1 /dev/nst0 (on a FreeBSD system)
#
# If you need to to an offline, refer to the drive as $4
# e.g. mt -f $f offline
#
# Many changers need an offline after the unload. Also many
# changers need a sleep 60 after the mtx load.
#
# N.B. If you change the script, take care to return either
# the mtx exit code or a 0. If the script exits with a non-zero
# exit code, Bacula will assume the request failed.
#
# This simulates a barcode reader in the changer.
# The labes of the virtual barcode reader are located in the BARCODE_FILE
SIMULATE_BARCODE=true
BARCODE_FILE=/usr/local/etc/bacula-barcodes
me=$(basename $0)
# Debug
logger -p user.err "$me $@"
if [ -z "$1" ] ; then
usage;
fi
if [ -z "$2" ] ; then
usage;
fi
MTX=/bin/chio
CHANGER=$1
COMMAND=$2
if [ ! -z "$3" ]; then
SLOT=$3
fi
if [ ! -z "$4" ]; then
TAPE=$4
else
TAPE=/dev/nrsa2
fi
# Time to wait for loading
SLEEP=20
# What drive of the autochanger should be used primary
# At the moment bacula (1.31a) could not deal with more than one drive
DRIVE=1
usage()
{
echo ""
echo "The $me script for bacula"
echo "--------------------------------------"
echo ""
echo "usage: $me <changer-device> <command> [slot] [devicename of tapedrive]"
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 " (slot-base is calculated to 1 as first 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 aviable slots."
echo ""
echo "Example:"
echo " mtx-changer /dev/changer load 1 loads a tape from slot 1"
echo ""
exit 2
}
case ${COMMAND} in
unload)
# enable the following line if you need to eject the cartridge
mt -f ${TAPE} off
sleep 2
${MTX} -f ${CHANGER} return drive ${DRIVE}
# If the changer is power cycled with a tape loaded in a drive
if [ "$?" != "0" ]; then
free_slot=`${MTX} -f ${CHANGER} stat | grep "^slot " | grep -v "FULL" | awk '{print $2}'`
free_slot=${free_slot%:}
${MTX} -f ${CHANGER} move drive ${DRIVE} slot $free_slot
fi
;;
load)
${MTX} -f ${CHANGER} move slot $((${SLOT}-1)) drive ${DRIVE}
rtn=$?
# Increase the sleep time if you have a slow device
sleep $SLEEP
exit $rtn
;;
list)
if [ "${SIMULATE_BARCODE}" = "true" ]; then
if [ -f "$BARCODE_FILE" ]; then
cat $BARCODE_FILE | grep -v "^#"
exit 0
else
echo "Barcode file $BARCODE_FILE missing ... exiting!"
exit 1
fi
else
${MTX} -f ${CHANGER} status | grep "^slot .*: .*FULL>" | awk '{print $2}' | awk -F: '{print $1+1" "}' | tr -d "[\r\n]"
fi
;;
loaded)
# echo "Request loaded"
${MTX} -f ${CHANGER} status -S > /tmp/mtx.$$
rtn=$?
cat /tmp/mtx.$$ | grep "^drive ${DRIVE}: <FULL> .*slot" | awk '{print $6+1}' | tr -d ">"
cat /tmp/mtx.$$ | grep "^drive ${DRIVE}: .* source: <>" | awk "{print 0}"
rm -f /tmp/mtx.$$
exit $rtn
;;
slots)
# echo "Request slots"
${MTX} -f ${CHANGER} status | grep "^slot " | tail -1 | awk '{print $2+1}' | tr -d ":"
;;
*)
usage
;;
esac
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