Create app backup

backup.sh

#!/bin/sh

#set -x

INSTANCIA=$1

TODAY=$(date -I)

### ------------------------------------------------------------

### Constants.

### ------------------------------------------------------------

BACKUP_DIR="/backup/app_258"

WWW_DIR="/srv/www/htdocs"

# Tiempo que se conservaran los backup, indicado en numeros de dias.

# 0 : Infinito

# n : Se eliminaran los ficheros creados hace n dias.

EXPIRE_TIME=7

# TODO: Esto deber?a de obtenerse de los ficheros de configuracion.

APP_HOST_DB="localhost"

APP_NAME_DB="app_cr_258"

APP_USER_DB="app"

APP_PASSWD_DB="Ao3Z7mNV"

APP_DB_FILE="instancia-$INSTANCIA-$TODAY-BBDD.sql"

APP_FS_INC_FILE="instancia-$INSTANCIA-$TODAY-DIR_inc.tgz"

APP_FS_FULL_FILE="instancia-$INSTANCIA-$TODAY-DIR.tgz"

TAR_INCREMENTAL_FILE="snapshot_week_$INSTANCIA"

INC_NEW=10

INC_EXISTS=11

### ------------------------------------------------------------

### Utils.

### ------------------------------------------------------------

MYSQLDUMP=$(which mysqldump)

GZIP=$(which gzip)

MKDIR=$(which mkdir)

TAR=$(which tar)

DATE=$(which date)

FIND=$(which find)

## return:    $1: with incremental filename (path included).

##            exit if fail.

function check_incremental_file() {

	inc_file_n=$(find $BACKUP_DIR -maxdepth 1 -iname *.current | wc -l)

	case $inc_file_n in 

		"0")

			filename=$TAR_INCREMENTAL_FILE.$TODAY.current

			eval $1=$BACKUP_DIR/$filename

			echo "++ check_incremental_file() return no file."

			return $INC_NEW

		;;

		"1")

			filename=$(find $BACKUP_DIR -maxdepth 1 -iname *.current)

			eval $1=$filename

			echo "++ check_incremental_file() found. [$filename]"

			return $INC_EXISTS

		;;

		*)

			echo "** ERROR: Existe m?s de un archivo de control incremental."

			exit -1

		;;

	esac

}

function create_incremental() {

	

	echo "++ create_incremental() BEGIN"

	

	check_incremental_file incremental_file

	if [ $? -eq $INC_NEW ]; then

		create_full

		return

	fi

	

	cd $WWW_DIR

	$TAR cvpjf $BACKUP_DIR/$APP_FS_INC_FILE -g $incremental_file ./$INSTANCIA 2>&1

	echo "-- create_incremental() END"

}

function create_full() {

	

	echo "++ create_full() BEGIN"

	check_incremental_file incremental_file

	if [ $? -eq $INC_EXISTS ]; then

		mv $incremental_file ${incremental_file%"current"}$($DATE -I).finished

		check_incremental_file incremental_file

	fi

        cd $WWW_DIR

        $TAR cvpjf $BACKUP_DIR/$APP_FS_FULL_FILE -g $incremental_file ./$INSTANCIA 2>&1

	echo "-- create_full() END"

}

function create_db_backup() {

	echo "++ create_db_backup() BEGIN"

	$MYSQLDUMP --opt --host=$APP_HOST_DB --user=$APP_USER_DB --password=$APP_PASSWD_DB $APP_NAME_DB > $BACKUP_DIR/$APP_DB_FILE

	$GZIP -f $BACKUP_DIR/$APP_DB_FILE

	echo "-- create_db_backup() END"

}

function delete_expired() {

	echo "++ delete_expired() BEGIN"

	if [ $EXPIRE_TIME -gt 0 ]; then

		$FIND $BACKUP_DIR -maxdepth 1 -mtime +$EXPIRE_TIME -exec rm -f '{}' \; 

	fi

	echo "-- delete_expired() END"

}

### ------------------------------------------------------------

### Main Script.

### ------------------------------------------------------------

## Syntax check

if [ $# -lt 1 ]; then

	echo "$(basename $0) <instancia>"

	echo "** ERROR: Falta un parametro."

	exit 1

fi

## APP directory check

if [ ! -d $WWW_DIR/$INSTANCIA ]; then

	echo "** ERROR: No existe el directorio de la instancia [$INSTANCIA]."

	exit 2

fi

## Backup directory check

if [ ! -d $BACKUP_DIR ]; then

	echo -n "** No existe el directorio destino..."

	$MKDIR -p $BACKUP_DIR

	echo " created [$BACKUP_DIR]"

fi

## Day of week check

DAY_OF_WEEK=$($DATE +%u)

## Daily tasks

delete_expired

## Weekly tasks

case $DAY_OF_WEEK in

	"1")

		create_incremental

	;;

	"2")

		create_incremental

	;;

	"3")

		create_incremental

	;;

	"4")

		create_incremental

	;;

	"5")

		create_incremental

	;;

	"6")

		create_full

	;;

	"7")

	;;

	*)	

		echo "* ERROR: DAY_OF_WEEK=($DAY_OF_WEEK) valor incorrecto."

		exit 4

	;;

esac

create_db_backup

echo ":: Backup de instancia ($INSTANCIA) el dia $TODAY en $BACKUP_DIR"