Project Backup Script

I am using trac and subversion on my current project. I wrote the following script to do a full backup of trac and subversion and burn the results to a CD.

#!/bin/bash

## Backup subversion and trac and burn the backups to a CD.
##

## applications
##
TRACADMIN=/usr/bin/trac-admin
SVNADMIN=/usr/bin/svnadmin
MKISOFS=/usr/bin/mkisofs
CDRECORD=/usr/bin/cdrecord
DATE=/bin/date

## directory and file paths
##
REPO=/opt/repo/tde
TRACPROJ=/opt/trac
BACKUPDIR=/home/steve/backup
TMPDIR=$$
CDDEVICE=/dev/cdrom
SVNDUMPFILE=$BACKUPDIR/$TMPDIR/temp/svn_dump.txt
DATEFILE=$BACKUPDIR/$TMPDIR/temp/backupdate.txt
LOGFILE=$BACKUPDIR/$TMPDIR/backup.log

if [[ $EUID -ne 0 ]]; then
 echo "This script must be run as root"
 exit 1
fi

## check for the directory structure and attempt to create if needed
##
if [[ ! -e $BACKUPDIR ]]; then
 if ! mkdir $BACKUPDIR; then
     exit 1;
 fi
fi

if [[ -e $BACKUPDIR/$TMPDIR ]]; then
 exit 1;  # temp dir already exists
else
 if ! mkdir $BACKUPDIR/$TMPDIR; then
     exit 1
 fi
fi

if ! mkdir $BACKUPDIR/$TMPDIR/iso; then
 echo "Failed to create $BACKUPDIR$TMPDIR/iso" >> $LOGFILE;
 exit 1;
fi

if ! mkdir $BACKUPDIR/$TMPDIR/temp; then
 echo "Failed to create $BACKUPDIR/$TMPDIR/temp" >> $LOGFILE;
 exit 1;
fi

## dump subversionto SVNDUMPFILE
##
echo "Dumping subversion" >>$LOGFILE
echo "" >>$LOGFILE
if ! $SVNADMIN dump $REPO > $SVNDUMPFILE 2>>$LOGFILE; then
 exit 1;
fi

## hot backup trac
##
echo "" >>$LOGFILE
echo "Performing hotcopy of trac" >> $LOGFILE
echo "" >>$LOGFILE
if ! $TRACADMIN $TRACPROJ hotcopy $BACKUPDIR/$TMPDIR/temp/trac \
         1>>$LOGFILE 2>>$LOGFILE; then
 exit 1;
fi

## create a file with the date time the backup was done
##
echo `$DATE` > $DATEFILE

## create iso file
## mkisofs does not seem to return a status value so we dont know if it
## actually succeeded.
##
echo "" >>$LOGFILE
echo "Making ISO file" >> $LOGFILE
echo "" >>$LOGFILE
$MKISOFS -fRrlJ -o $BACKUPDIR/$TMPDIR/iso/backup.iso \
     $BACKUPDIR/$TMPDIR/temp 1>>$LOGFILE 2>>$LOGFILE

## burn the iso file to a cd
## cdrecord does not seem to return a status value so we dont know if it
## actually succeeded.
##
echo "" >>$LOGFILE
echo "Burning the CD" >> $LOGFILE
echo "" >>$LOGFILE
$CDRECORD -eject speed=24 dev=$CDDEVICE $BACKUPDIR/$TMPDIR/iso/backup.iso \
         1>>$LOGFILE 2>>$LOGFILE
#if $CDRECORD speed=24 dev=$CDDEVICE $BACKUPDIR/$TMPDIR/iso/backup.iso \
#            1>>$LOGFILE 2>>$LOGFILE; then
#    exit 1;
#fi

## clean up if everything was OK
## since we don't know if mkisofs or cdrecord succeeded do not
## automatically delete the director.
##
#rm -rf $BACKUPDIR/$TMPDIR

The only thing in this script to make note of is the line TMPDIR=$$. The TMPDIR variable is will be the name of the temporary directory to backup to and this is set to the PID of the process which is returned by $$.

To automate the backup I run the script through cron. To setup the cron entry I ran the following commands as root.

[root@myhost]# export EDITOR=vi
[root@myhost]# crontab -e

This will bring up a vi editor with root's crontab file. I then added the following line and saved the file.

59 23 * * 5 /home/steve/bin/sp_backup.sh

The script will now be run every Friday at 11:59 PM. The only problems that I encountered with this script is that neither mkisofs or cdrecord seem to return the UNIX standard value of 0 for success and non-zero for failure. I was going to have the script delete all of the directories and files that were created. But because I can't determine if the script was successful I decided to leave the files in place and to manually ensure that the backup was successful.