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#!/bin/bash
# Script Name: dar_backups.sh
# Author: Roi Rodriguez Mendez & Mauro Silvosa Rivera (Cluster Digital S.L.)
# 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. The
# remote copy feature needs a ssh authentication method which
# doesn't prompt for a password, in order to make it non-interactive
# (useful for cron, if you plan to run it by hand, this is not
# necessary).
# Version: 1.0
# Revision History:
# 22.08.2005 - Creation
# Base directory where backups are stored
BASE_BAK_DIR=/var/BACKUP/data
# 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=100M
# Remote backup settings
REMOTE_BAK="true"
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}
## 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 / \
-g ./DATA -g ./home -g ./root -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 / \
-g ./DATA -g ./home -g ./root -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
MASTER=`ls ${BASE_BAK_DIR}/${MONTHLY_BAK_DIR}/*_master*.dar | tail -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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