#!/bin/sh

#
# This script will backup local drives to a remote tape drive over ssh.
#  written by David B. Peterson <dave@toppledwagon.com>
#
# Follow these steps before using it the first time:
# 1.  Configure the env variables below, especially OPERATOR, TAPEHOST
#      TAPEDEV, and FILESYSTEMS
# 2.  run the following commands as root (on the machine to be backed up):
# ssh-keygen -t dsa
# cat ~/.ssh/id_dsa.pub | ssh OPERATOR@TAPEHOST 'cat - >> ~/.ssh/authorized_keys2'
#
# where OPERATOR and TAPEHOST are as you have defined below.

# We will run under screen so you can come back to the backup, if you need to.
if [ ! "$WINDOW" ]; then
   exec screen $0
   exit
fi

# ssh-agent allows us to backup securely without entering the passphrase so
# many times.  This version uses openssh v2.9
if [ ! $SSH_AGENT_PID ]; then
   echo Starting ssh-agent...
   exec ssh-agent -- /bin/sh $0
   exit
fi

OPERATOR=backup
TAPEHOST=tapehost.example.com
TAPEDEV=/dev/nst0
RMT=/sbin/rmt
RSH='/usr/bin/ssh'
DATE=`date +%Y%m%d`
DUMP='/sbin/dump 0auf'
LOGDIR=/var/log/backup
FILESYSTEMS='hda1 hda7 hda6 hda5 hda10'

#### config above ####
# backup FILESYSTEMS to the TAPEDEV on TAPEHOST with DUMP as OPERATOR using RSH

export RMT RSH
mkdir -p $LOGDIR &> /dev/null
ssh-add ~/.ssh/id_dsa

echo "Rewinding tape..."
REWIND="mt -f $TAPEDEV rewind"
$RSH $OPERATOR@$TAPEHOST $REWIND

for FS in $FILESYSTEMS
do
   $DUMP $OPERATOR@$TAPEHOST:$TAPEDEV /dev/$FS 2>&1 | tee $LOGDIR/$FS.$DATE
done

echo "Rewinding and ejecting tape..."
OFFLINE="mt -f $TAPEDEV offline"
$RSH $OPERATOR@$TAPEHOST $OFFLINE