#!/bin/bash
##########################################################################################
# bashup.sh 
# alotlikeyesterday@gmail.com
#
#	 A simple bash script to backup scattered files throughout a linux box
#	 into a gzipped tar archive with option to send to cd burner.
#
# Todo:
#	-make TYPE=2 - add trailing "/" so files written to original locations 
#	 upon untarring, as opposed to TYPE=0, where directory structure is 
#	 maintaned, but written in PWD
#	-fix nameing scheme of archive when written to cd
#	
# Updated: 5/14/2005
#
############ DEFINE ######################################################################

TYPE=1			#0-create archive keeping original path of files, from cwd
			#1-create archive in dated directory 

DATA=(

/home/dir1/fileA.txt
/var/log/
/home/userdir/
/etc/httpd.conf

)

# name the compressed archive
date=$(date +"%m%d%y")
ARCHIVENAME="backup_$date.tar"
fullname=$ARCHIVENAME.gz

# location of backup directory
BACKUPDIR=/backups

############Check if archive already exists####

if [ -e $BACKUPDIR/$fullname ]
then
 echo -n "->$fullname already exists, overwrite? [y,n]: "
 read overwrite
   if [ "$overwrite" == "y" ] 
   then 
     rm -rf $BACKUPDIR/$fullname
     echo "  ->$fullname deleted."
   else
     echo "Goodbye"
     exit 0
   fi
fi 

######### Count the number of Data elements #####

element_count=${#DATA[@]}
echo "->There are $element_count elements to be archived..."

############Check if each Data element exists####

echo "->Checking data..."
index=0

 while [ "$index" -lt "$element_count" ]
 do
   if [ -e ${DATA[$index]} ]
     then
	echo "  ->${DATA[$index]}..............exists"
     else
	echo "  ->${DATA[$index]}..............does not exist, please check your desired data"
	exit 0
   fi
  let "index = $index +1"
 done

####################################################

echo "->Adding Data to the archive..."

######### CREATE TYPE 0 ARCHIVE ####################

if [ "$TYPE" == 0 ] 
then
 #create archive,starting with first element
 tar -cvf $ARCHIVENAME ${DATA[0]} > /dev/null
 index=1

 #add the rest of the elements to the archive
 while [ "$index" -lt "$element_count" ]
 do
  echo "  ->Adding ${DATA[$index]}"
  tar -r --file=$ARCHIVENAME ${DATA[$index]} > /dev/null
  let "index = $index +1"
 done

 gzip $ARCHIVENAME
 ARCHIVENAME=$ARCHIVENAME.gz
fi

######### CREATE TYPE 1 ARCHIVE #####################

if [ "$TYPE" == 1 ]
then
 # create compressed archive, copy to backup directory
 tmpdir=/backup_$date
 sudo mkdir -m 777 $tmpdir
 index=0

 while [ "$index" -lt "$element_count" ]
 do
  echo "  ->Adding ${DATA[$index]}"
  cp -r ${DATA[$index]} $tmpdir 
  let "index = $index +1"
 done

 tar -cvf $ARCHIVENAME $tmpdir > /dev/null
 gzip $ARCHIVENAME
 ARCHIVENAME=$ARCHIVENAME.gz
fi

###### CHECK THE SIZE OF THE ARCHIVE ##########

size=`du -k $ARCHIVENAME |sed s/$ARCHIVENAME//`
echo "->The size of the archive is $size kilobytes"

##### MOVE TO BACKUP AREA, CLEAN UP ########### 
 
cp $ARCHIVENAME $BACKUPDIR
sudo mv $ARCHIVENAME /backups

if [ "$TYPE" == 1 ]
 then
  sudo rm -rf $tmpdir
fi

###### CHECK THAT THE BACKUP WAS CREATED ######

if [ -e $BACKUPDIR/$ARCHIVENAME ]
then
 success=1
 echo "->Backup was successful, moved to $BACKUPDIR"
else
 echo "->Backup was unsuccessful, time to troubleshoot"
 exit 0
fi 

########## BURN TO CD #########################
# see http://mirror.centos.org/centos/4/docs/html/rhel-sbs-en-4/s1-disks-cdrw.html
# also http://www-structmed.cimr.cam.ac.uk/Local/CD.html

if [ "$size" -lt "700000" ]
 then
  echo -n "->Do you want to send the archive to CD? [y,n]: " 
  read burn
   if [ "$burn" == "y" ] && [ "$success" == "1" ]
    then
     echo "->Burning to disc..."
	mkisofs -r -o backup.iso $BACKUPDIR/$ARCHIVENAME
	cdrecord -v -eject dev=/dev/hdc backup.iso
	rm -rf backup.iso
     echo "->Disc is burned, please check."
   else
     echo "->OK, archive is in $BACKUPDIR"
   fi
else
  echo "The archive is too big ($size kb) to write to CD"
fi