#!/bin/sh
# -*-Shell-script-*-
#
# This script Excerpted From:
# ---------------------------
# From: Aaron Lehmann <aaronl@vitelus.com>
# To: Rick Moen <rick@linuxmafia.com>
# Cc: svlug@svlug.org
# Subject: Re: [svlug] Tape backup software survey
# Date: Sun, 20 May 2001 16:28:12 -0700
#
#
# debbackup - A backup script for debian systems
# Copyright (C) 2000 Aaron Lehmann
# 
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  
# 02111-1307, USA.


BACKUPFILENAME=/etc/debbackup.conf
BADIRS="/home /etc"

run_script() {
	# Import configuration variables from /etc/debbackup.conf
	. $BACKUPFILENAME

	# make sure all of the variables from the conf file are set
	if [ x$RSYNCHOST = x ] ||
	   [ x$RSYNCMODULE = x ]; then
#	   [ x$EMAILADDR = x ]
		echo "The debbackup configuration file exists, but it is not fully configured.";
		echo "Try running with the -configure option to set it up.";
		exit 1;
	fi

	if [ x$HOSTNAME = x ] ; then
		HOSTNAME=`hostname`;
	fi

	# First check sanity of system. If /home is empty, don't be happy
	if [ `ls /home/ | wc -l | awk '{print $1}'` = 0 ] ; then
		echo "Backup failed: /home is empty. User directories are only supported";
		echo "in /home for the time being. Sorry.";
		exit 1;
	fi

	# save selections
	TMPFILENAME=`tempfile`
	dpkg --get-selections | awk '$2 == "install" { print }' > $TMPFILENAME
	rsync -azq $TMPFILENAME ${RSYNCHOST}::${RSYNCMODULE}/$HOSTNAME/selections
	rm -f $TMPFILENAME


	# set up --excludes arg
	if [ ! x$EXCLUDES = x ] ; then
		EXCLUDEARG=`(echo -n ' ' ; echo $EXCLUDES ) | sed 's/ / --exclude /g'`
	fi

	# take into account additional files, if any
	if [ ! x$BAADDITIONAL = x ] ; then
		BADIRS="$BADIRS $BAADDITIONAL";
	fi

	# back up
	rsync -azq --delete $EXCLUDEARG $BADIRS ${RSYNCHOST}::${RSYNCMODULE}/$HOSTNAME/
	
	exit 0;
}

config_client() 
{

	echo "I'm going to ask you a few questions. Your answers will be used to";
	echo "configure debbackup for a machine which is to be backed up.";
	echo "Note that this configurator will probably only work when running as root.";
	echo "Proceeding will overwrite your configuration for debbackup.";
	echo -n "Continue? [Y/n] ";
	read CONTINUECHOICE
	case $CONTINUECHOICE in
		y|Y|'' ) ;;
		* ) exit 0 ;;
	esac

	echo "OK, starting interrogation.";
	echo ;

	(echo '# debbackup configuration file' ; echo ) > $BACKUPFILENAME;
	
#	DEFAULT=root
#	echo -n "1) Your e-mail address (for error notification) [$DEFAULT]: ";
#	read CHOICE
#	if [ x$CHOICE = x ] ; then CHOICE=$DEFAULT; fi
#	echo "EMAILADDR='$CHOICE'" >> $BACKUPFILENAME;
	
	DEFAULT=192.168.1.1
	echo -n "1) rsync server to back up to [$DEFAULT]: ";
	read CHOICE
	if [ x$CHOICE = x ] ; then CHOICE=$DEFAULT; fi
	echo "RSYNCHOST='$CHOICE'" >> $BACKUPFILENAME;
	
	DEFAULT=backup
	echo -n "2) rsync module on server to back up to [$DEFAULT]: ";
	read CHOICE
	if [ x$CHOICE = x ] ; then CHOICE=$DEFAULT; fi
	echo "RSYNCMODULE='$CHOICE'" >> $BACKUPFILENAME;

	DEFAULT=
	echo -n "3) Additional files to back up [$DEFAULT]: ";
	read CHOICE
	if [ x$CHOICE = x ] ; then CHOICE=$DEFAULT; fi
	echo "BAADDITIONAL='$CHOICE'" >> $BACKUPFILENAME;

	DEFAULT=
	echo    "4) Path names (shell globs allowed) to exculde (seperated by"
	echo -n "   spaces) [$DEFAULT]: ";
	read CHOICE
	if [ x$CHOICE = x ] ; then CHOICE=$DEFAULT; fi
	echo "EXCLUDES='$CHOICE'" >> $BACKUPFILENAME;
	
	chmod 755 $BACKUPFILENAME;

	echo "Configuration complete. Congratulations!";
	echo ;
	echo -n "Would you like to add a cron job to backup on a regular basis? [Y/n] ";
	read CHOICE
	case $CHOICE in
		y|Y|'' ) ;;
		* ) exit 0 ;;
	esac
	
	CRONLINE=`crontab -l 2>/dev/null | grep debbackup`
	if [ $? = 0 ] ; then
		echo "You appear to already have a crontab entry for debbackup:"
		echo "    $CRONLINE";
		echo "Please remove it manually before continuing."
		echo -n "Continue? [N/y]: "
		read CHOICE
		case $CHOICE in
			y|Y ) ;;
			* ) exit 1 ;;
		esac
	fi

	DEFAULT='/usr/sbin/debbackup'
	echo -n "Full path to the debbackup script? [$DEFAULT]: ";
	read DEBBPATH
	if [ x$DEBBPATH = x ] ; then DEBBPATH=$DEFAULT; fi
	
	echo "For any of the following questions, you may enter '*',"
	echo "meaning \"all possible values\".";
	echo ;
	
	DEFAULT='*'
	echo -n "During which months should debbackup be run (1-12)? [$DEFAULT]: ";
	read MONTHS
	if [ x$MONTHS = x ] ; then MONTHS=$DEFAULT; fi
	
	DEFAULT='*'
	echo -n "During which days of the month (1-31)? [$DEFAULT]: ";
	read DAYSM
	if [ x$DAYSM = x ] ; then DAYSM=$DEFAULT; fi
	
	DEFAULT='1'
	echo -n "During which days of the week (1-7)? [$DEFAULT]: ";
	read DAYSW
	if [ x$DAYSW = x ] ; then DAYSW=$DEFAULT; fi
	
	DEFAULT='5'
	echo -n "At which hour (0-24)? [$DEFAULT]: ";
	read HOURS
	if [ x$HOURS = x ] ; then HOURS=$DEFAULT; fi

	DEFAULT='30'
	echo -n "At which minute (0-59)? [$DEFAULT]: ";
	read MINUTES
	if [ x$MINUTES = x ] ; then MINUTES=$DEFAULT; fi

	echo -n "At which microsecond (0-999999)? [0]: ";
	sleep 1;
	echo ;
	echo "Just kidding!";
	echo ;

	echo "$MINUTES $HOURS $DAYSM $MONTHS $DAYSW $DEBBPATH" | crontab -
	
	echo "Cron job installed:";
	echo "    $MINUTES $HOURS $DAYSM $MONTHS $DAYSW $DEBBPATH";
	echo "Remember, you can always modify it using \"crontab -e\".";
	
	exit 0;
}

config_server()
{
	echo "I'm going to ask you a few questions. Your answers will be used to";
	echo "configure rsync on a server which will recieve backups from clients.";
	echo "Note that this configurator will probably only work when running as root.";
	echo "This configurator will attempt to append to your /etc/rsyncd.conf file.";
	echo -n "Continue? [Y/n] ";
	read CONTINUECHOICE
	case $CONTINUECHOICE in
		y|Y|'' ) ;;
		* ) exit 0 ;;
	esac
	
	echo "OK, starting interrogation.";
	echo ;
	
	RSYNCCONFFILENAME=/etc/rsyncd.conf-

	cp -f /etc/rsyncd.conf $RSYNCCONFFILENAME
	echo >> $RSYNCCONFFILENAME;
	echo "# The following module created by debbackup" >> $RSYNCCONFFILENAME;

	DEFAULT=backup
	echo -n "1) rsync module name to configure [$DEFAULT]: ";
	read CHOICE
	if [ x$CHOICE = x ] ; then CHOICE=$DEFAULT; fi
	echo "[$CHOICE]" >> $RSYNCCONFFILENAME;
	
	DEFAULT=/home/backup
	echo -n "2) Path to directory to store backups [$DEFAULT]: ";
	read CHOICE
	if [ x$CHOICE = x ] ; then CHOICE=$DEFAULT; fi
	if [ ! -d $CHOICE ] ; then
		echo "This file does not exist or is not a directory.";
		echo "I'm creating it at $CHOICE.";
		echo "Please verify that it has been created after this configuration is complete.";
		mkdir -p $CHOICE;
	fi
	echo "path=$CHOICE" >> $RSYNCCONFFILENAME;
	STORAGEDIR=$CHOICE

	echo -n "3) Hosts to allow backups from: ";
	read CHOICE
	echo "hosts allow=$CHOICE" >> $RSYNCCONFFILENAME;
	
	DEFAULT=nobody
	echo -n "4) User that will own the $STORAGEDIR directory [$DEFAULT]: ";
	read CHOICE
	if [ x$CHOICE = x ] ; then CHOICE=$DEFAULT; fi
	chown $CHOICE $STORAGEDIR;
	echo "uid=$CHOICE" >> $RSYNCCONFFILENAME;

	DEFAULT=root
	echo -n "5) Group for the $STORAGEDIR directory [$DEFAULT]: ";
	read CHOICE
	if [ x$CHOICE = x ] ; then CHOICE=$DEFAULT; fi
	echo "gid=$CHOICE" >> $RSYNCCONFFILENAME;
	chgrp $CHOICE $STORAGEDIR;

	echo "read only=no" >> $RSYNCCONFFILENAME;
	echo "use chroot=yes" >> $RSYNCCONFFILENAME;

	chmod 644 $RSYNCCONFFILENAME;
	mv $RSYNCCONFFILENAME /etc/rsyncd.conf;

	echo "Configuration complete. Congratulations!";
	echo "Make sure that the rsync daemon is running or will be run from inetd.";
	echo "See the rsync documentation for more instructions.";
	exit 0;
}

config_unknown()
{
	# find out which we should use: dialog or whiptail
	
	#MESSAGEAPP=`type -p dialog`
	#if [ x$MESSAGEAPP = x ] ; then
	#	MESSAGEAPP=`type -p whiptail`
	#	if [ x$MESSAGEAPP = x ] ; then
	#		echo "Fatal error: can not find dialog or whiptail";
	#		exit 1;
	#	fi
	#fi

	echo "Would you like to configure debbackup for a:";
	echo "	c: Client";
	echo "	s: Server";
	echo "	q: Neither. I don't want to configure debbackup right now."
	echo -n "Please enter your choice [c, s, q]: ";
	read CHOICE
	case $CHOICE in
		c ) config_client ;;
		s ) config_server ;;
		* ) echo "debbackup not configured. Come back soon!" ;;
	esac
}

display_help()
{
	echo "$0 [-help]";
	echo "    Display this help text";
	echo "$0 [-configure]";
	echo "    Run a step-by-step configurator for a client or server";
	echo "$0";
	echo "    Back up files if previously configured as a client.";
	echo "    Otherwise, run the configurator.";
}

case $1 in 
	-configure ) config_unknown ;;
	-help|-h ) display_help ;;
	'' )
		if [ ! -f $BACKUPFILENAME ] ; then
			echo "You don't seem to have debbackup configured.";
			config_unknown ;
		fi

		run_script ;;
	* )
		display_help ;;
esac

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