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Diffstat (limited to 'contrib/mtx-changer')
| -rwxr-xr-x | contrib/mtx-changer | 431 |
1 files changed, 431 insertions, 0 deletions
diff --git a/contrib/mtx-changer b/contrib/mtx-changer new file mode 100755 index 0000000..cf68ddd --- /dev/null +++ b/contrib/mtx-changer @@ -0,0 +1,431 @@ +#! /bin/sh +############################################################################### +# AMANDA Tape Changer script for use with the MTX tape changer program +# Version 1.0 - Tue Feb 20 13:59:39 CST 2001 +# +# Based on 'stc-changer' by Eric Berggren (eric@ee.pdx.edu) +# Updated by Tim Skirvin (tskirvin@ks.uiuc.edu) +# +# Given that there's no license...let's make this the Perl Artistic License. +# Just make sure you give me and Eric credit if you modify this. +############################################################################### + +### USER CONFIGURATION +# Name of the tape drive (takes place of "tapedev" option in amanda.conf) +# and default driver number in library (usu 0) that DRIVE_NAME points to +DRIVE_NAME="/dev/rmt/0n" +DRIVE_NUM=0 + +# Location of "STC" command and control device +MTX_CMD="/usr/local/sbin/mtx"; +MTX_CONTROL="/dev/scsi/changer/c4t1d0"; + +# Whether tape drive must eject tape before changer retrieves +# (ie, EXB-2x0). Usually okay if set while not necessary, bad if +# required but not set. +DRIVE_MUST_EJECT=1 + +# How long to check drive readiness (in seconds) after mounting (or +# ejecting) a volume (on some libraries, the motion or eject command may +# complete before the drive has the volume fully mounted and online, +# or ready for retrieval, resulting in "Drive not ready"/"Media not +# ready" errors). Do an "mt status" command every 5 seconds upto this +# time. +DRIVE_READY_TIME_MAX=120 + +# tape "mt" command location... +MT_CMD="/usr/bin/mt" # called via "MT_CMD -f DRIVE_NAME rewind" & + # "MT_CMD -f DRIVE_NAME offline" to eject + # and "MT_CMD -f DRIVE_NAME status" to get ready info + +############################################################################## +# +NumDrives=-1 +NumSlots=-1 +LastSlot=-1 +LoadedTape=-1 + +# +# Usage information +# +usage() +{ + echo + echo "Usage: $Progname <command> [arg...]" + echo " -info reports capability and loaded tape" + echo " -slot <slot> loads specified tape into drive" + echo " current reports current mounted tape" + echo " next loads logically next tape (loops to top)" + echo " prev loads logically previous tape (loops to bot)" + echo " first loads first tape" + echo " last loads last tape" + echo " 0..99 loads tape from specified slot#" + echo " -eject uloads current mounted tape" + echo " -reset resets changer (and drive); loads first tape" + echo + exit 5 +} + +# +# Perform "stc" changer command (& handle the "fatal" errors) +# else, set 'CommandResStr' and 'CommandRawResStr' to the result string +# and 'CommandResCode' to the exit code +# +dotapecmd() +{ + cmd=$1 + arg=$2 + + CommandResStr=`$MTX_CMD $MTX_CONTROL $cmd $arg 2>&1` + CommandRawResStr=$CommandResStr + CommandResCode=$? + + CommandResStr=`echo $CommandResStr | head -1 | sed 's/^[^:]*: //'` + if [ $CommandResCode -gt 1 ]; then + echo "0 $Progname: returned $CommandResStr" + exit 2 + fi +} + +# +# Unload tape from drive (a drive command; "ejecttape" is a changer command +# to actually retrieve the tape). Needed by some changers (controlled by +# setting "DRIVE_MUST_EJECT") +# +ejectdrive() +{ + # Tell drive to eject tape before changer retrieves; req'd by some + # drives (ie, EXB-2x0). Not needed by QDLT-4x00. Do a "rewind" + # command first, then "offline" to eject (instead of "rewoffl") + # + if [ "$DRIVE_MUST_EJECT" -ne 0 ]; then + mtresstr=`$MT_CMD -f $DRIVE_NAME rewind 2>&1` + mtrescode=$? + + if [ $mtrescode -ne 0 ]; then + if echo "$mtresstr" | egrep -s 'no tape'; then + :; # no tape mounted; assume okay... + else + # can't eject tape, bad; output: <tape#> reason + echo "0 $mtresstr" + exit 1 + fi + else + mtresstr=`$MT_CMD -f $DRIVE_NAME offline 2>&1` + mtrescode=$? + + checkdrive 1 + fi + fi +} + +# +# Check drive readiness after (un)mounting a volume (which may take a while +# after the volume change command completes) +# +checkdrive() +{ + unmounting=$1 + + if [ "$DRIVE_READY_TIME_MAX" -gt 0 ]; then + + # sleep time between checks + pausetime=5 + + # number of interations to check + numchecks=`expr $DRIVE_READY_TIME_MAX / $pausetime` + if [ "$numchecks" -eq 0 ]; then + numchecks=1 + fi + + # check until success, or out of attempts... + while [ "$numchecks" -gt 0 ]; do + mtresstr=`$MT_CMD -f $DRIVE_NAME status 2>&1` + mtrescode=$? + + if [ $mtrescode -eq 0 ]; then + # Success ? + return 0 + else + # pause, before trying again.... + if [ "$numchecks" -gt 1 ]; then + sleep $pausetime + + # if unmounting a volume, check for 'mt' command + # failure; (sleep first for additional comfort) + if [ "$unmounting" -ne 0 ]; then + return 0 + fi + fi + fi + numchecks=`expr $numchecks - 1` + done + + # failed; output: -1 reason + echo "-1 drive won't report ready" + exit 1 + fi +} + +# +# Get changer parameters +# +getchangerparms() +{ + dotapecmd status + if [ $CommandResCode -eq 0 ] && \ + echo "$CommandResStr" | egrep -s '^Storage Changer'; then + + NumDrives=`echo $dspec | wc -l` + NumDrives=`echo "$CommandRawResStr" | \ + grep 'Data Transfer Element' | wc -l` + if [ "$NumDrives" -le "$DRIVE_NUM" ]; then + echo "$Program: Invalid drive # specified ($DRIVE_NUM > $NumDrives)" + exit 3 + fi + # grep 'Data Transfer Element $DRIVE_NUM' | \ + LoadedTape=`echo "$CommandRawResStr" | \ + grep 'Data Transfer Element' | \ + grep 'Storage Element [0-9]' | \ + awk '{ print $7 }' ` + if [ -z "$LoadedTape" -o "$LoadedTape" = "e" ]; then + LoadedTape=-1 + fi + NumSlots=`echo "$CommandRawResStr" | \ + grep 'Storage Element [0-9]\{1,\}:' | \ + grep -v 'Data Element' | \ + wc -l | sed -e 's/ //g' ` + LastSlot=`expr $NumSlots - 1` + else + echo \ + "$Progname: Can't get changer parameters; Result was $CommandResStr" + exit 3 + fi +} + +# +# Display changer info +# +changerinfo() +{ + getchangerparms + + # output status string: currenttape numslots randomaccess? + echo "$LoadedTape $NumSlots 1" + exit 0 +} + +# +# Eject current mounted tape +# +ejecttape() +{ + getchangerparms + ct=$LoadedTape + + # If no tape reported mounted, assume success (could be bad if changer + # lost track of tape) + # + if [ $ct -lt 0 ]; then + CommandResCode=0 + else + ejectdrive + dotapecmd unload + fi + + if [ $CommandResCode -ne 0 ]; then + # failed; output: <tape#> reason + echo "$ct $CommandResStr" + exit 1 + else + # success; output: <tape#> drive + echo "$ct $DRIVE_NAME" + exit 0 + fi +} + +# +# Move specified tape into drive (operation level) +# +doloadtape() +{ + slot=$1 + if [ "$slot" -eq "$LoadedTape" ]; then + return 0 + fi + ejectdrive + dotapecmd load $slot + return $CommandResCode +} + +# +# Load next available tape into drive +# +loadnexttape() +{ + curslot=$1 + direction=$2 + + startslot=$curslot + while true; do + if doloadtape $curslot; then + return 0 + else + if echo $CommandResStr | egrep -s 'Slot.*reported empty'; then + + if [ "$direction" -lt 0 ]; then + curslot=`expr $curslot - 1` + if [ "$curslot" -lt 0 ]; then + curslot=$LastSlot + fi + else + curslot=`expr $curslot + 1` + if [ "$curslot" -gt "$LastSlot" ]; then + curslot=0 + fi + fi + + # Check if we're back to where we started... + if [ "$curslot" = "$startslot" ]; then + if [ "$direction" -lt 0 ]; then + CommandResStr="No previous volume available" + else + CommandResStr="No subsequent volume available" + fi + return 1 + fi + else + return 1 + fi + fi + done +} + +# +# Report loadtape() status +# +reportstatus() +{ + if [ $CommandResCode -eq 0 ]; then + # success; output currenttape drivename + echo "$LoadedTape $DRIVE_NAME" + exit 0 + else + # failed (empty slot?); output currenttape reason + echo "$LoadedTape $CommandResStr" + exit 1 + fi +} + + +# +# Move specified tape into drive (command level) +# +loadtape() +{ + slot=$1 + + getchangerparms + + case "$slot" in + current) + if [ $LoadedTape -lt 0 ]; then + CommandResStr="Can't determine current tape; drive empty ?" + CommandResCode=1 + fi + ;; + prev) + if [ $LoadedTape -le 0 ]; then + loadnexttape $LastSlot -1 + else + loadnexttape `expr $LoadedTape - 1` -1 + fi + ;; + next) + if [ $LoadedTape -ge $LastSlot -o $LoadedTape -lt 0 ]; then + loadnexttape 0 1 + else + loadnexttape `expr $LoadedTape + 1` 1 + fi + ;; + first) + loadnexttape 0 1 + ;; + last) + loadnexttape $LastSlot -1 + ;; + [0-9]*) + doloadtape $slot + ;; + *) + # error; no valid slot specified + echo "$Progname: No valid slot specified" + exit 1 + ;; + esac + + if [ $CommandResCode -eq 0 ]; then + getchangerparms + checkdrive + fi + reportstatus +} + +# +# Reset changer to known state +# +resetchanger() +{ + ejectdrive + dotapecmd reset + if [ $CommandResCode -ne 0 ]; then + # failed; output: failed? reason + echo "-1 $CommandResStr" + exit 2; + else + loadtape first + fi +} + +############################################################################# +# +# MAIN +# +Progname=`basename $0` + +if [ ! -x "$MTX_CMD" ]; then + echo "-1 $Progname: cannot run STC command ($MTX_CMD)" + exit 2 +fi +if [ -n "$MTX_CONTROL" ]; then + if echo "$MTX_CONTROL" | egrep -s '^-f'; then + :; + else + MTX_CONTROL="-f $MTX_CONTROL" + fi +fi +if [ -n "$DRIVE_NUM" ]; then + DRIVE_NUM=0 +fi + +if [ $# -ge 1 ]; then command=$1; else command="-usage"; fi + +case "$command" in + -info) + changerinfo + ;; + -slot) + loadtape $2 + ;; + -eject) + ejecttape + ;; + -reset) + resetchanger + ;; + *) + usage + ;; +esac + +exit 0 |