#!/bin/bash
#
# Copyright (c) 2007 by FR Technologies, LLC All Rights Reserved
#
# This software is provided `AS IS' and without any express or implied
# warranties, including, without limitation, the implied waranties of
# merchantability and fitness for a particular purpose.
#
# Redistribution and use of source are permitted provided that:
#
# (1) source distributions may not be sold for profit on physical media
# such as disks, tapes, and CD-ROMS, without expressed written permission
# from the author.
#
# @(#) FRTech.netident $Id: rsync_backup.sh,v 1.7 2007/01/15 16:34:57 noloc Exp $
#
# Author:              Gil Colon 
# Creation date:       2007-01-13 
#
# Description: rsync backup local directories to disk. Incremental backups. 
# Day of week to run the fsck.  Default is Sunday.  Change to match your location
# Derived by:  uname '+%u'; Mon=1, Tues=2, Wed=3, Thur=4, Fri=5, Sat=6, Sun=7
#
# Syntax: rsync_backup.sh has variables that can be set within script
#
# Changes log
# ------------
# 
# Date          Version         Author
# Chg. Desc.: Added standard FR Technologies copyright header
# Chg. Desc.: Added to CVSROOT/modules
# Chg. Desc.: Fixed error handling pre-mounted disk to gracefully handle FSCK
# Chg. Desc.: Redirected FSCK output to /dev/null
#
# Description:  Original posting into CVS repository
#
# @(#) FRTechident $Id: rsync_backup.sh,v 1.7 2007/01/15 16:34:57 noloc Exp $
#

message() {
	/bin/mail -s "${SUBJECT}" root <<ENDOFMAIL

$MESSAGE

ENDOFMAIL

}

backup() {
	for dir in ${LIST}
	do	/bin/echo "Backing up /${dir}/ to ${BASEDIR}/${dir}/" >> ${LOG}
		/usr/bin/rsync ${RSYNCOPTS} /${dir}/ ${BASEDIR}/${dir}/ >> ${LOG} 2>&1
	done
}

checkfs() {
	/bin/echo "Performing file system consistency check for ${BASEDIR}" >> ${LOG}

	#
	# Read the man page for e2fsck for more options on it's use.
	#

       	/sbin/e2fsck -f -c -n ${RAWDEV} > /dev/null 2>&1
       	/bin/echo "Consistency check completed, backup beginning...." >> ${LOG}
}

mntdsk() {
	/bin/echo "Mounting backup disk drive." >> ${LOG}
	/bin/mount ${RAWDEV} ${BASEDIR} >> ${LOG} 2>&1
}

umntdsk() {
	/bin/echo "Un-mounting backup disk drive." >> ${LOG}
	/bin/umount ${BASEDIR} >> ${LOG} 2>&1
}

#
# List of file systems and/or directories to be backed up
# Listing is comprised of all top-level root (/) subdirectories.
# Backup details
#

LIST="bin boot dev etc home lib root sbin usr var"

#
# Backup logfile
#

LOG="/tmp/rsync-messages.log"

#
# Read the man page for rsync for more options on it's use.
#

RSYNCOPTS="-a -l -v"

#
# Mount point of the removable media and the raw device name.  Change to match your location
#

BASEDIR="/backup"
RAWDEV="/dev/sdb"

#
# Date used for consistency check frequency of backup device.  %u value is day
# of week range from 1 - 7, where Monday is equal to 1.  Check man page for date
# for additional formatting options.
#

DATE=`/bin/date '+%u'`

#
# Day of week to run the fsck.  Default is Sunday.  Change to match your location
#

MYFSCKDAY="7"
WHOAMI=`/usr/bin/whoami`

export PATH LOG RSYNCOPTS BASEDIR RAWDEV DATE MYFSCKDAY WHOAMI

#
# Remove traces of old log files should they exist
#

if [ -f ${LOG} ]
then	/bin/rm -f ${LOG}
fi

#
# We want to be sure that this program is only run by the root user.
# If you are not the root user, then abort the program.
#

if [ "${WHOAMI}" != "root" ]
then	/bin/echo "You must be the root user to use this program"
	exit 0
fi

/bin/mount | /bin/grep backup > ${LOG} 2>&1
if [ $? -eq 0 ]
then	#
	# Lets see if we can unmount the backup device
	# If successful we will proceed, if not, then we
	# we will exit and send a help message
	#

	umntdsk;
	if [ $? -eq 1 ]
	then	SUBJECT="Backup System Problem"
		MESSAGE="Problem with ${BASEDIR} and/or ${RAWDEV} on `/bin/date`. Can't unmount disk."
		message; exit 0
	else	mntdsk;
		if [ $? -eq 1 ]
		then	SUBJECT="Backup System Problem"
			MESSAGE="Problem with ${BASEDIR} and/or ${RAWDEV} on `/bin/date`. Can't re-mount disk."
			message; exit 0
		fi
	fi
fi

END="FALSE"

while [ "${END}" == "FALSE" ]
do	# 
	# If ${DATE} is not == ${MYFSCKDAY}, then perform consistency check.
	# Mount the backup device
	#

        if [ "${DATE}" == "${MYFSCKDAY}" ]
	then	# 
		# Perform a consistency check.
		# Mount the backup device
		# Perform the rsync backup
		# Umount the backup device
		#

		checkfs; mntdsk; backup; umntdsk

		#
        	# Send backup log message
		#
		SUBJECT="System Backup w/ FSCK"
		MESSAGE="FSCK performed today `/bin/date`.  Log: `cat ${LOG}`"
		message; END=TRUE; exit 0
	else	/bin/echo "No consistency check today `/bin/date`" >> ${LOG}
		/bin/echo "Mounting backup disk drive." >> ${LOG}

		#
		# Mount the backup device
		# Perform the rsync backup
		# Umount the backup device
		#

		mntdsk; backup; umntdsk

		#
        	# Send backup log message
		#

		SUBJECT="System Backup no FSCK"
		MESSAGE="No FSCK check today `/bin/date`.  Log: `cat $LOG`"
		message; END=TRUE; exit 0
	fi
done

#
# Always double check your backups to be sure that they ran successfully.
#