/usr/lib/amanda/chg-multi is in amanda-server 1:3.3.3-2ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#
# Amanda, The Advanced Maryland Automatic Network Disk Archiver
# Copyright (c) 1991-1999 University of Maryland at College Park
# Copyright (c) 2007-2012 Zmanda, Inc. All Rights Reserved.
# All Rights Reserved.
#
# Permission to use, copy, modify, distribute, and sell this software and its
# documentation for any purpose is hereby granted without fee, provided that
# the above copyright notice appear in all copies and that both that
# copyright notice and this permission notice appear in supporting
# documentation, and that the name of U.M. not be used in advertising or
# publicity pertaining to distribution of the software without specific,
# written prior permission. U.M. makes no representations about the
# suitability of this software for any purpose. It is provided "as is"
# without express or implied warranty.
#
# U.M. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL U.M.
# BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
# OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
# Author: James da Silva, Systems Design and Analysis Group
# Computer Science Department
# University of Maryland at College Park
#
#
# chg-multi.sh - generic tape changer script
#
# source utility functions and values from configure
prefix=/usr
exec_prefix=${prefix}
amlibexecdir=/usr/lib/amanda
. ${amlibexecdir}/chg-lib.sh
pname="chg-multi"
if [ -d "/var/log/amanda" ]; then
logfile=/var/log/amanda/changer.debug
else
logfile=/dev/null
fi
echo `_ "arguments ->"` "$@" >> $logfile
ourconf=`amgetconf changerfile`
if ! error=try_find_mt; then
echo <none> $error
exit 2
fi
EXPR=expr
# EXPR=/usr/local/bin/expr # in case you need a more powerful expr...
# read in some config parameters
if [ ! -f "$ourconf" ]; then
answer=`_ '<none> %s: %s does not exist' "$pname" "$ourconf"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 2
fi
firstslot=`awk '$1 == "firstslot" {print $2}' $ourconf 2>/dev/null`
if [ -z "$firstslot" ]; then
answer=`_ '<none> %s: firstslot not specified in %s' "$pname" "$ourconf"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 2
fi
lastslot=`awk '$1 == "lastslot" {print $2}' $ourconf 2>/dev/null`
if [ -z "$lastslot" ]; then
answer=`_ '<none> %s: lastslot not specified in %s' "$pname" "$ourconf"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 2
fi
nslots=`$EXPR $lastslot - $firstslot + 1`
gravity=`awk '$1 == "gravity" {print $2}' $ourconf 2>/dev/null`
if [ -z "$gravity" ]; then
answer=`_ '<none> %s: gravity not specified in %s' "$pname" "$ourconf"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 2
fi
needeject=`awk '$1 == "needeject" {print $2}' $ourconf 2>/dev/null`
if [ -z "$needeject" ]; then
answer=`_ '<none> %s: needeject not specified in %s' "$pname" "$ourconf"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 2
fi
multieject=`awk '$1 == "multieject" {print $2}' $ourconf 2>/dev/null`
if [ -z "$multieject" ]; then
echo `_ 'Note: setting multieject to a default of zero'` >> $logfile
multieject=0
fi
ejectdelay=`awk '$1 == "ejectdelay" {print $2}' $ourconf 2>/dev/null`
if [ -z "$ejectdelay" ]; then
echo `_ 'Note: setting ejectdelay to a default of zero'` >> $logfile
ejectdelay=0
fi
posteject=`awk '$1 == "posteject" {print $2}' $ourconf 2>/dev/null`
if [ -z "$posteject" ]; then
echo `_ 'Note: setting posteject to a default of "true"'` >> $logfile
posteject=true
fi
ourstate=`awk '$1 == "statefile" {print $2}' $ourconf 2>/dev/null`
if [ -z "$ourstate" ]; then
answer=`_ '<none> %s: statefile not specified in %s' "$pname" "$ourconf"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 2
fi
if [ -f "$ourstate" -a ! -r "$ourstate" ]; then
answer=`_ "<none> %s: Can't read the statefile %s" "$pname" "$ourstate"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 2
fi
if [ -f "$ourstate" -a ! -w "$ourstate" ]; then
answer=`_ "<none> %s: Can't write the statefile %s" "$pname" "$ourstate"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 2
fi
dirstate=`dirname $ourstate`
if [ ! -e "$dirstate" ]; then
answer=`_ "<none> %s: Directory %s doesn't exist" "$pname" "$dirstate"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 2
fi
if [ ! -d "$dirstate" ]; then
answer=`_ '<none> %s: %s must be a directory' "$pname" "$dirstate"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 2
fi
if [ ! -w "$dirstate" ]; then
answer=`_ "<none> %s: Can't write to %s directory" "$pname" "$dirstate"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 2
fi
# needeject and multieject are incompatible
if [ $needeject -eq 1 ] && [ $multieject -eq 1 ] ; then
answer=`_ '<none> %s: needeject and multieject cannot be both enabled in %s' "$pname" "$ourconf"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 2
fi
# read in state: only curslot and curloaded at the present time
curslot=`awk '$1 == "curslot" {print $2}' $ourstate 2>/dev/null`
if [ -z "$curslot" ]; then
curslot=$firstslot
fi
curloaded=`awk '$1 == "curloaded" {print $2}' $ourstate 2>/dev/null`
if [ -z "$curloaded" ]; then
curloaded=0
fi
# process the command-line
# control vars to avoid code duplication: not all shells have functions!
usage=0
checkgravity=0
ejectslot=0
loadslot=0
slotempty=0
ejectonly=0
if [ $# -ge 1 ]; then command=$1; else command="-usage"; fi
case "$command" in
-info) # return basic information about changer
backwards=`$EXPR 1 - $gravity`
answer="$curslot $nslots $backwards"
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 0
;;
-reset) # reset changer. Actually, we only reset changer state. We
# trust that the operator has reloaded a stack and reset the
# hardware. In most cases, we do not want to actually do
# anything: if the operator has done something with the
# hardware, we have no way to know what the actual current
# slot is. If the hardware state has not changed, and what is
# really wanted is to load the first slot, use "slot first"
# instead
checkgravity=0
loadslot=1
newslot=$firstslot
curslot=$firstslot
# XXX put changer-specific reset here, if applicable
;;
-eject) # eject tape if loaded. Note that if multieject is set, this
# only can make sense if the position is last and gravity 1
checkgravity=0
loadslot=0
newslot=$curslot
ejectslot=1
ejectonly=1
if [ $multieject -eq 1 ] && \
([ $gravity -eq 0 ] || [ $curslot -ne $lastslot ]) ; then
# Can't do this: if we eject, the stacker is going to
# load the next tape, and our state will be botched
answer=`_ '%s %s: Cannot use -eject with multieject/nogravity/notlastslot' "$curslot" "$pname"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 1
fi
if [ $curloaded -eq 0 ]; then
answer=`_ '%s %s: slot already empty' "$curslot" "$pname"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 1
fi
;;
-slot) # change to slot
checkgravity=1
loadslot=1
slotparm=$2
case "$slotparm" in
[0-9]*)
newslot=$slotparm
if [ $newslot -gt $lastslot ] || \
[ $newslot -lt $firstslot ] ; then
answer=`_ '%s %s: no slot %s: legal range is %s ... %s' "$newslot" "$pname" "$newslot" "$firstslot" "$lastslot"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 1
fi
;;
current)
newslot=$curslot
;;
first)
newslot=$firstslot
;;
last)
newslot=$lastslot
;;
next|advance)
newslot=`$EXPR $curslot + 1`
if [ $newslot -gt $lastslot ]; then
newslot=$firstslot
fi
if [ $slotparm = advance ]; then
loadslot=0
fi
;;
prev)
newslot=`$EXPR $curslot - 1`
if [ $newslot -lt $firstslot ]; then
newslot=$lastslot
fi
;;
*)
answer=`_ '<none> %s: bad slot name "%s"' "$pname" "$slotparm"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 1
;;
esac
;;
*)
usage=1
;;
esac
if [ $usage -eq 1 ]; then
answer=`_ '<none> usage: %s {-reset | -slot [<slot-number>|current|next|prev|advance] | -info | -eject}' "$pname"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 2
fi
# check for legal move
if [ $checkgravity -eq 1 ] && [ $gravity -ne 0 ] ; then
if [ $newslot -lt $curslot ] || [ "$slotparm" = "prev" ] ; then
answer=`_ '%s %s: cannot go backwards in gravity stacker' "$newslot" "$pname"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 1
fi
fi
# Do the 'mt offline' style of stacker control if applicable
if [ $multieject -eq 1 ] && [ $loadslot -eq 1 ] && [ $newslot -ne $curslot ]
then
# XXX put changer-specific load command here, if applicable
curloaded=0 # unless something goes wrong
slotempty=0
while [ $curslot -ne $newslot ]; do
device=`awk '$1 == "slot" && $2 == '$curslot' {print $3}' $ourconf 2>/dev/null`
if [ "$device" = "" ]; then
answer=`_ '%s %s: slot %s device not specified in %s' "$curslot" "$pname" "$curslot" "$ourconf"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 2
fi
echo `_ ' -> offline'` "$device" >> $logfile
if ! try_eject_device $device; then
answer=`_ '%s %s: %s: unable to change to slot %s' "$newslot" "$pname" "$device" "$curslot"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 2
fi
[ $ejectdelay -gt 0 ] && sleep $ejectdelay
echo `_ ' -> running'` $posteject $device >> $logfile
$posteject $device >> $logfile 2>&1
status=$?
if [ $status -ne 0 ]; then
answer=`_ '%s %s: %s %s failed: %s' "$newslot" "$pname" "$posteject" "$device" "$status"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 2
fi
curslot=`$EXPR $curslot + 1`
if [ $curslot -gt $lastslot ] ; then
curslot=$firstslot
fi
done
fi
if [ $ejectonly -eq 1 ] \
|| ([ $needeject -eq 1 ] \
&& [ $loadslot -eq 1 ] \
&& [ $curloaded -eq 1 ] \
&& [ $newslot -ne $curslot ])
then
# XXX put changer-specific load command here, if applicable
curloaded=0 # unless something goes wrong
slotempty=0
# try to unload the current device
device=`awk '$1 == "slot" && $2 == '$curslot' {print $3}' $ourconf 2>/dev/null`
if [ "$device" = "" ]; then
answer=`_ '%s %s: slot %s device not specified in %s' "$curslot" "$pname" "$curslot" "$ourconf"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 2
fi
echo `_ ' -> offline'` $device >> $logfile
try_eject_device $device
if [ $? -ne 0 ]; then
#
# XXX if the changer-specific eject command can distinguish
# betweeen "slot empty" and more serious errors, return 1
# for the first case, 2 for the second case. Generically,
# we just presume an error signifies an empty slot.
#
slotempty=1
else
[ $ejectonly -eq 0 ] && [ $ejectdelay -gt 0 ] && sleep $ejectdelay
echo `_ ' -> running '` $posteject $device >> $logfile
$posteject $device >> $logfile 2>&1
status=$?
if [ $status -ne 0 ]; then
answer=`_ '%s %s: %s %s failed: %s' "$newslot" "$pname" "$posteject" "$device" "$status"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 2
fi
fi
fi
if [ $loadslot -eq 1 ]; then # load the tape from the slot
# XXX put changer-specific load command here, if applicable
curloaded=1 # unless something goes wrong
slotempty=0
curslot=$newslot
# try to rewind the device
device=`awk '$1 == "slot" && $2 == '$curslot' {print $3}' $ourconf 2>/dev/null`
if [ "$device" = "" ]; then
answer=`_ '%s %s: slot %s device not specified in %s' "$curslot" "$pname" "$curslot" "$ourconf"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 2
fi
amdevcheck_status $device
if [ $? -ne 0 ]; then
#
# XXX if the changer-specific load command can distinguish
# betweeen "slot empty" and more serious errors, return 1
# for the first case, 2 for the second case. Generically,
# we just presume an error signifies an empty slot.
#
slotempty=1
curloaded=0
fi
fi
# update state
echo `_ '# multi-changer state cache: DO NOT EDIT!'` > $ourstate
echo curslot $newslot >> $ourstate
echo curloaded $curloaded >> $ourstate
# return slot info
if [ $slotempty -eq 1 ]; then
answer=`_ '%s %s: slot is empty: %s' "$newslot" "$pname" "$amdevcheck_message"`
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 1
fi
if [ "$command" = -slot -a "$slotparm" = advance ]; then
device=/dev/null
fi
answer="$newslot $device"
echo `_ 'Exit ->'` $answer >> $logfile
echo $answer
exit 0
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