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#!/bin/bash
# Script Name: dar_backups.sh
# Author: Roi Rodriguez Mendez & Mauro Silvosa Rivera (Cluster Digital S.L.)
# Fixes by: Jason Lewis - jason at NO dickson SPAM dot st
# Description: dar_backups.sh is a script to be runned from cron which
# backups data and stores it locally and optionally remote using scp.
# It decides between doing a master or an incremental backup based
# on the existance or not of a master one for the actual month.
# Revision History:
# 23.06.2008 - modified to work with latest version of dar which requires -g before each path to backup - Jason Lewis
# 24.10.2006 - changed script to do differential backups based on the last diff
# 18.10.2006 - added BACKUP_PATHS variable to simplify adding new paths
# Jason Lewis jason@NOdicksonSPAM.st
# 22.08.2005 - Creation
# Base directory where backups are to be stored
BASE_BAK_DIR=/backup
# base directory for files to backup. all paths for backing up are listed relative to this path
ROOT_DIR=/
# Paths to backup
# add paths here, in a space seperated list between round brackets.
# you can escape out spaces with \ or ''
# Paths should be relative to ROOT_DIR
#BACKUP_PATH=(my/first/path another\ path/with\ spaces 'yet another/path/with/spaces')
BACKUP_PATHS=( home user/lib/cgi-bin var/www/cgi-bin var/lib/cvs var/lib/svn var/lib/accounting mysql_backup usr/local/bin etc )
# Directory where backups for the actual month are stored (path relative to
# $BASE_BAK_DIR)
MONTHLY_BAK_DIR=`date -I | awk -F "-" '{ print $1"-"$2 }'`
# Variable de comprobacion de fecha
CURRENT_MONTH=$MONTHLY_BAK_DIR
# Name and path for the backup file.
SLICE_NAME=${BASE_BAK_DIR}/${MONTHLY_BAK_DIR}/backup_`date -I`
# Max backup file size
SLICE_SIZE=200M
# Remote backup settings
REMOTE_BAK="false"
REMOTE_HOST="example.com"
REMOTE_USR="bakusr"
REMOTE_BASE_DIR="/var/BACKUP/example.com/data"
REMOTE_MONTHLY_DIR=$MONTHLY_BAK_DIR
REMOTE_DIR=${REMOTE_BASE_DIR}/${REMOTE_MONTHLY_DIR}
########################################################
# you shouldn't need to edit anything below this line
#
# STR='a,b,c'; paths=(${STR//,/ }); TEST=`echo ${paths[@]//#/-g }`;echo $TEST
# args=(); for x in "${paths[@]}"; do args+=(-g "$x"); done; program "${args[@]}"
#BACKUP_PATHS_STRING=`echo ${BACKUP_PATHS[@]//#/-g }`
args=()
for x in "${BACKUP_PATHS[@]}"; do args+=(-g "$x"); done;
BACKUP_PATHS_STRING="${args[@]}"
echo backup path string is "$BACKUP_PATHS_STRING"
## FUNCTIONS' DEFINITION
# Function which creates a master backup. It gets "true" as a parameter
# if the monthly directory has to be created.
function master_bak () {
if [ "$1" == "true" ]
then
mkdir -p ${BASE_BAK_DIR}/${MONTHLY_BAK_DIR}
fi
/usr/bin/dar -m 256 -s $SLICE_SIZE -y -R $ROOT_DIR \
$BACKUP_PATHS_STRING -c ${SLICE_NAME}_master #> /dev/null
if [ "$REMOTE_BAK" == "true" ]
then
/usr/bin/ssh ${REMOTE_USR}@${REMOTE_HOST} "if [ ! -d ${REMOTE_DIR} ]; then mkdir -p $REMOTE_DIR; fi"
for i in `ls ${SLICE_NAME}_master*.dar`
do
/usr/bin/scp -C -p $i ${REMOTE_USR}@${REMOTE_HOST}:${REMOTE_DIR}/`basename $i` > /dev/null
done
fi
}
# Makes the incremental backups
function diff_bak () {
MASTER=$1
/usr/bin/dar -m 256 -s $SLICE_SIZE -y -R $ROOT_DIR \
$BACKUP_PATHS_STRING -c ${SLICE_NAME}_diff \
-A $MASTER #> /dev/null
if [ "$REMOTE_BAK" == "true" ]
then
for i in `ls ${SLICE_NAME}_diff*.dar`
do
/usr/bin/scp -C -p $i ${REMOTE_USR}@${REMOTE_HOST}:${REMOTE_DIR}/`basename $i` > /dev/null
done
fi
}
## MAIN FLUX
# Set appropriate umask value
umask 027
# Check for existing monthly backups directory
if [ ! -d ${BASE_BAK_DIR}/${MONTHLY_BAK_DIR} ]
then
# If not, tell master_bak() to mkdir it
master_bak "true"
else
# Else:
# MASTER not void if a master backup exists
# original line to get the master backup does not take into account the diffs
# MASTER=`ls ${BASE_BAK_DIR}/${MONTHLY_BAK_DIR}/*_master*.dar | tail -n 1 | awk -F "." '{ print $1 }'`
# new master line gets the latest dar backup and uses that to make the diff
MASTER=`ls -t ${BASE_BAK_DIR}/${MONTHLY_BAK_DIR}/*.dar | head -n 1 | awk -F "." '{ print $1 }'`
# Check if a master backup already exists.
if [ "${MASTER}" != "" ]
then
# If it exists, it's needed to make a differential one
diff_bak $MASTER
else
# Else, do the master backup
master_bak "false"
fi
fi
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