In the files, chg-manual and chg-mtx there is a function in the code
labelled loadslot(). In this funciton the dd command is used to look
at the tape.
I have excerpted some code from chg-mtx, below...
This appears to be post-processing code following that event wherein a
tape is newly inserted into the drive...
Here are my questions:
----------------------
1) Is this entire section concerned with determining if the next
tape is the cleaning tape? IOW, is the purpose of the DD to see if we
are reading a cleaning tape?
3) Also, when next-tape equals first-tape, what does AMANDA *want to
do* when asked to write over the first tape in the magazine?
4) I downloaded, built, and installed mtx-1.2.16rel, the SCSI
control program available at SourceForge. I could not find certain
options that are used in the chg-mtx below. For example, these
options I do not find: -l, -u. Does anyone know the actions implied
by:
mtx -u
mtx -l
Thank for any and all advice... I appreciate your time...
J
#############################
## from 3b3/libexec/chg-mtx
#############################
# Slot 6 might contain an ordinary tape rather than a cleaning
# tape. A cleaning tape auto-ejects; an ordinary tape does not.
# We therefore have to read the status again to check what
# actually happened.
readstatus
if [ $used -gt 0 ];then
echo " -> unload $used" >> $logfile
res=`$MTX -u $used`
status=$?
echo " -> status $status" >> $logfile
echo " -> res $res" >> $logfile
if [ $status -ne 0 ];then
answer="<none> $myname: $res"
code=2
echo "Exit -> $answer" >> $logfile
echo "$answer"
exit $code
fi
fi
if [ $whichslot = advance ];then
answer="$load /dev/null"
code=0
echo "Exit -> $answer" >> $logfile
echo "$answer"
exit $code
fi
echo " -> load $load" >> $logfile
res=`$MTX -l $load`
status=$?
echo " -> status $status" >> $logfile
echo " -> res $res" >> $logfile
if [ $status -eq 0 ];then
echo " -> rew $load" >> $logfile
$MT $MTF $tape rewind
$DD if=$tape bs=32k count=1 >> $logfile 2>&1
answer="$load $tape"
code=0
else
answer="$load $res"
code=2
fi
echo "Exit -> $answer" >> $logfile
echo "$answer"
exit $code
#######
