Auto backup script

[Elliot Dierksen]

Well folks, here is a little script that you may find useful should you be
one of the lucky few who have a tape drive for your Unix-PC.  This script
was modeled after Tbackup.sh except it doesn't do any prompting. It sends
mail about what happened and how much was backed up. It won't do a backup if
it requires more than one tape. I run this from my crontab every night and
it makes life much easier. It also saved my rear end when my HD croaked!!
Enjoy!!

EBD
--------snip-------snip--------snip----------snip----------snip------------
#        autobackup
#
#	Script adapted from AT&T's Tbackup.sh
#
#	Elliot Dierksen 01/31/90
#
#----------------------------------------------------------------------

RET=
SHROOT=/usr/bin
TAPEDEVNAME=/dev/rft3
LOGFILE=/tmp/tape.log
MAILTO=root

##	PROMPT TO INSERT TAPE.  GET TAPE TYPE.

TTYPE="UNIX PC"

##
##	GET BACKUP TYPE
##

#BTYPE="Complete Backup"
BTYPE="Partial Backup"

(
echo "Subject: Automatic Backup\n"

##	Lock Tape, then read the VTOC

for ARG in +l -v
do
	RET=`$SHROOT/Tgetname $ARG`
	ERC=$?

	if [ "$ERC" != "0" ]
	then
		echo "Error code $ERC during Tgetname $ARG"
		exit 1
	fi
done

OVWRIT="Yes"
TAPETYPE="UNIX PC"
fCONFM="No"

##
##	GET BACKUP OPTIONS
##

VERIFY="Yes"
OWCONF="No"
OFFSET=0
DATAAT="Start of tape"
TPNAME="ctctape"
SSNAME="autoback"
SSCMNT="Automatic $BTYPE"

##	LOCATE FILES FOR COMPLETE OR PARTIAL BACKUPS.

DATEFILE=/dev/null
eval set $BTYPE

if [ "$1" = "Complete" ]
then
	find / -newer /etc/.installdate -print > $FORMROOT/BUfiles
	DATEFILE=/etc/.lastbackup

elif [ "$1" = "Partial" ]
then
	if [ ! -s /etc/.lastbackup ]
	then
		COMPFILE=/etc/.installdate
		DATEFILE=/etc/.lastbackup
		echo \
"No Complete Backup has been done, so this backup will be a Complete Backup."
		BTYPE="Complete Backup"
	else
		COMPFILE=/etc/.lastbackup
		DATEFILE=/etc/.lastpartial
	fi
	
	find / -newer $COMPFILE -print > $FORMROOT/BUfiles
fi

##
##	CREATE SAVE-SET LIST
##

if [ ! -s $FORMROOT/BUfiles ]
then
	clear
	echo "There are no files to be backed up at this time."
	exit
fi

##	THE NUMBER OF TAPES IS RETURNED AS THE ERROR NUMBER

$SHROOT/TmakessList $OFFSET <$FORMROOT/BUfiles >ss.filelist
NTAPES=$?

##	CONFRIM EXTRA TAPES

FMORE=`expr $NTAPES \> 1`

if [ $FMORE = 1 ]
then
	echo "This Backup requires more than one tape, backup aborted!"
	rm -f ss.filelist
	exit
fi

echo "Backup in progress."

if [ "$TTYPE" = "UNIX PC" ]
then
	echo "ss.filelist" > /tmp/BUlist$$
	cat /tmp/BUlist$$ $FORMROOT/BUfiles | \
	   tapecpio -ocT124 2>/tmp/size$$ | \
	   dbuf -oT124O$OFFSET > $TAPEDEVNAME
	ERC=$?
else
	OFFSET=0
	cat $FORMROOT/BUfiles | \
	   tapecpio -ocT124 2>/tmp/size$$ | \
	   dbuf -oT124O$OFFSET > $TAPEDEVNAME
	ERC=$?
fi

if [ "$ERC" != "0" ]
then
	echo "Error in backup during tapecpio:"
	echo "    ERC = $ERC, OFFSET = $OFFSET, TAPE = $TAPEDEVNAME"

	$SHROOT/Tgetname -w "BAD BACKUP" "$TPNAME" "" "" \
	                    $OFFSET 0 0
	exit
fi

$SHROOT/Tgetname -t

eval set `grep "blocks" /tmp/size$$`
NBLOCKS=$1

##
##	PERFORM VERIFY PASS.
##

if [ "$VERIFY" = "Yes" ]
then
	echo "Performing verify pass."

	dbuf -iT124O$OFFSET"S"$NBLOCKS $TAPEDEVNAME |
		tapecpio -ictT124 > /dev/null 2>&1
	ERC=$?

	if [ "$ERC" != "0" ]
	then
		echo \
"An error has been discovered while trying to verify this backup."
		echo "Error in verify during tapecpio:"
		echo "    ERC = $ERC, TAPE = $TAPEDEVNAME"
		    
	##	PLACE BAD BACKUP INFO ON BOTH TAPES.

		$SHROOT/Tgetname -w "BAD BACKUP" "$TPNAME" "" "" \
	                            $OFFSET 0 0
		exit
	fi

	echo "Verification complete."

fi

date > $DATEFILE

##
##	CREATE SAVE-SET INFORMATION TO PUT ON TAPE.
##

$SHROOT/Tgetname -t

if [ "$TTYPE" = "UNIX PC" ]
then
	eval set `wc -l ss.filelist`
	NFILES=$1
	$SHROOT/Tgetname -w "$BTYPE" "$TPNAME" "$SSNAME" "$SSCMNT" \
	                    $OFFSET $NBLOCKS $NFILES
	ERC=$?
	if [ "$ERC" != "0" ]
	then
		echo "An error $ERC occurred while trying to write to the tape."
		exit
	else
		echo "$NFILES file(s), $NBLOCKS block(s)."
	fi
else
	$SHROOT/Tgetname -3
fi

##
##	REMOVE GARBAGE FILES
##

##
##	SET UP Tbackup.menu AND Backup.menu WITH LAST BACKUP DATES
##

	BDATE=`cat -s  /etc/.lastbackup`
	UDATE=`cat -s  /etc/.lastpartial`
	if [ -z "$BDATE" ]
	then
		COM="has not been done yet."
		PAR="has not been done yet."
		set `cat -s /etc/.installdate`
	elif [ -z "$UDATE" ]
	then
		set $BDATE
		COM="last done on $2 $3."
		PAR="has not been done yet."
	else 
		set $BDATE $UDATE
		COM="last done on $2 $3."
		PAR="last done on $8 $9."
	fi
	cat > $FORMROOT/Tbackup.menu << END
Menu = Partial Backup includes files changed since $2 $3
Label = Backup to Tape
Prompt =Complete Backup saves whole system, Partial Backup saves changed items.

##	NOTE:
##
##	It is important that each name be unique in the nineth
##	(9th) character position.  This insures that the data
##	will be transfered onto the tape in the correct coded
##	format.  The current default for unrecognized backup
##	types is BUPARTIAL.

##             v
Name = Complete Backup - $COM
Name = Partial Backup - $PAR
Name = Backup User
Name = Backup Folders
Name = Backup Files
Name = Backup by Names
END

	cat > $FORMROOT/Backup.menu << END
Menu = Partial Backup includes files changed since $2 $3
Label = Backup
Prompt =Complete Backup saves whole system, Partial Backup saves changed items.

Name = Complete Backup - $COM
Name = Partial Backup - $PAR
Name = Backup one user
END

##	CONFIRM COMPLETE

eval set $BTYPE
if [ "$1" = "Partial" ]
then
	echo "The partial backup is now finished."
else
	echo "The backup is now complete."
fi
) 2>&1 | mail $MAILTO

$SHROOT/Tgetname -l

rm -f /tmp/BUlist?*
rm -f /tmp/size?*
rm -f /tmp/error?*
rm -f $FORMROOT/BUfiles
rm -f ss.filelist
rm -f /tmp/tape.vtoc
-- 
Elliot Dierksen        "I don't care if my lettuce has DDT on it,
                        as long as it's crisp!!" -- Jorma Kaukonen
Work) {att,codas}!candi!fang!ebd                      (407) 660-3377
Home) {peora,uunet,ucf-cs}!tarpit!alfred!elliot       (407) 290-9744