ib

#!/bin/sh
# Author: Rémi BARBERO
# Date: 2017-04-14
# Mail: rems14@remibarbero.fr
# Incremental backups with rsync and hard links

DIR="$(dirname "$0")"

# include local configuration
while [ $# -gt 0 ]; do
    case "$1" in
	-c)
	    shift
	    if [ $# -gt 0 ]; then
		SET_CONFIG=true
		CONFIG=$1
	    fi
	    shift
	    ;;
	--config*)
	    SET_CONFIG=true
	    CONFIG=$(echo $1 | sed -e 's/^[^=]*=//g')
	    shift
	    ;;
	*)
	    break
	    ;;
    esac
done

if $SET_CONFIG; then
    # test if this is relative or absolute path
    if ! echo "$CONFIG" | grep -q "/"; then
	CONFIG=./$CONFIG
    fi
    if [ -f $CONFIG ]; then
	. $CONFIG
    else
	echo "no config file found"
	exit 1
    fi
else
    if [ -f "$DIR/ib.cfg" ]; then
    . "$DIR/ib.cfg"
    else
	echo "no config file found"
	exit 1
    fi
fi

# test variables in config.cfg
# SOURCE_PATH must be not empty
if [ ${#SOURCE_PATH[*]} -eq 0 ]; then
    echo 'error: SOURCE_PATH is not defined.'
    exit 1
fi
# DEST_PATH must be defined
if [ -z $DEST_PATH ]; then
    echo 'error: DEST_PATH_PATH is no defined.'
    exit 1
fi
# START_NUMBER must be defined
if [ -z $START_NUMBER ]; then
    echo 'error: START_NUMBER is not defined.'
    exit 1
fi
# NUMBER_BACKUP must be not empty
if [ $NUMBER_BACKUP -eq 0 ]; then
    echo 'error: NUMBER_BACKUP is not defined.'
    exit 1
fi
# TIME_BACKUP must be not empty
if [ $TIME_BACKUP -eq 0 ]; then
    echo 'error: TIME_BACKUP is not defined.'
    exit 1
fi

DEST_RSYNC_FOLDER="0_`date +%Y%m%d`"

# Manage the stock of backups
# Arguments (four):
# 1) DEST_PATH: where backups are stored
# 2) START_NUMBER is the start number in the first name of the backup
# 3) NUMBER_OF_BACKUP
# 4) INTERVAL_TIME_BETWEEN_TWO_BACKUPS (n * 24h)
# return string of two fields: "DO HARD_LINKS_SOURCE"
# 1) DO: tells if rsync must be executed
# 2) HARD_LINKS_SOURCE: is the folder where rsync make hard links
RES="$(sh -x $DIR/manage_save.sh $DEST_PATH $START_NUMBER $NUMBER_BACKUP $TIME_BACKUP)"
DO=$(echo $RES | cut -f1 -d ',')
HARD_LINKS_SOURCE=$(echo $RES | cut -f2 -d ',')

#rsync
if [ "$DO" -eq "1" ]; then
    for i in "${SOURCE_PATH[@]}"
    do
	rsync -a --delete $(if [ ${#EXCLUDES[@]} -ne 0 ]; then echo "${EXCLUDES[@]/#/--exclude=}"; fi) $(if [ ! -z $HARD_LINKS_SOURCE ]; then echo "--link-dest=$DEST_PATH/$HARD_LINKS_SOURCE"; fi) "$i" $(if [ ! -z $SSH ]; then echo "-e \"ssh -p $SSH_PORT\" ${SSH_USER}@${SSH_HOST}:"; fi)$DEST_PATH/$DEST_RSYNC_FOLDER/
    done
fi