#!/bin/sh
# This file is included in the GNU tar distribution as an example.  It is
# not used by default unless the proper line is uncommented in backup-specs.
# System administrators will probably want to customize this and
# backup-specs for their site. 
#
# This script should be run by tar with --info-script (-F) to inform
# interested parties that a tape for the next volume of the backup needs to
# be put in the tape drive. 
#

# Include location of `sendmail' and GNU finger. 
PATH="/usr/lib:/usr/local/gnubin:${PATH}"
export PATH

# Get definition of TAPE_FILE, VOLNO_FILE, and so on. 
. /home/gd2/dump/backup-specs

mt -f "${TAPE_FILE}" rewind
mt -f "${TAPE_FILE}" offl

volno="`cat \"${VOLNO_FILE}\" 2> /dev/null`"
if [ $? -ne 0 ]; then
   volno=0
fi

# Get a list of people to whom to mail a request for changing the tape.
# This egregious nightmare parses the output from GNU finger which shows
# which users are logged into consoles (and thus in the office and capable
# of changing tapes).
#
# Certain users (like `root') aren't real users, and shouldn't be notified.
# Neither should `zippy', `elvis', etc. (on the GNU machines) since they're
# just test accounts. 
recipients="`
    finger .clients 2> /dev/null \
     | sed -ne '
          1{
            /clientstatus: file has not changed in/{
               n;n;n;n;d
            }
            n;n;d
           }
          s/^..................................................//
          $!{/^$/d
             /^root?*$/d
             /^zippy$/d
             /^fnord$/d
             /^elvis$/d
             /^snurd$/d
             H
            }
          ${g
            : 1
            s/\(\n\)\([A-Za-z0-9_][A-Za-z0-9_]*\)\(\n.*\)\2\(.*\)/\1\2\3\4/g
            s/\n$//g
            t 1
            s/^\n//
            s/\n$//g
            s/\n/, /g
            : 2
            s/, ,/,/g
            t 2
            p
           }'`"

# Customized behavior for FSF machines, to bring attention to the fact that
# the tape needs to be changed (who looks at the terminal?)
sendmail -oi -t << __EOF__
From: `basename $0` (backup tape-changing reminder)
To: ${recipients}
Cc: ${ADMINISTRATOR}
Subject: Backup needs new tape for volume ${volno}
Reply-To: ${ADMINISTRATOR}

This is an automated report from the backup script running on 
`hostname`. 

Volume ${volno} of the backup needs to be put in the tape drive.  Usually
whoever prepared the backup leaves labeled tapes on top of the drive
itself.  If there aren't any more, information about where to find tapes
and how to label them are posted on the wall by apple-gunkies (unhelpfully
obscured by a bookshelf).  An online copy (which is probably more
up-to-date) can also be found in ~friedman/etc/fsf/backup.how.
__EOF__


echo "Please put volume ${volno} in tape drive and press RETURN"
read input
echo "Writing volume ${volno}..."

sendmail -oi -t << __EOF__
From: `basename $0` (backup tape-changing reminder)
To: ${recipients}
Cc: ${ADMINISTRATOR}
Subject: Volume ${volno} for backup has been added
Reply-To: ${ADMINISTRATOR}

This is an automated report from the backup script running on 
`hostname`. 

The backup has been continued, so for now no further attention is required.
__EOF__

exit 0

# eof
