#!/bin/bash

export LC_ALL=C

# Katalog Docelowy
BACKUP_DIR=/volume1/NetBackup/laptop

# Katalog źródłowy
SOURCE_DIR=/home/kustran
IP_ADDR=pl-kustran
# Ilość przechowywanych kopii (1 kopia dziennie)
NUM_BACKUP=4

# Plik logu
LOG=$BACKUP_DIR/backup.log

# Logujemy start backupu
echo -n "Start: " > $LOG
date >> $LOG
cd $BACKUP_DIR

    # Jeżeli nie ma katalogu dla kopii to go tworzymy
    if [ ! -d $BACKUP_DIR ]
    then
        mkdir -p $BACKUP_DIR
    fi

    # Wywalamy najstarszy backup
    COUNT=0
    for i in $(find "$BACKUP_DIR" -maxdepth 1 -type d | sort -V);
    do
                if [ "$i" != "$BACKUP_DIR" ]
                then
                    COUNT=`expr $COUNT + 1`
                    if [ $COUNT -gt $NUM_BACKUP ]
                    then
                                echo "Deleting: $i" >> $LOG
                                sudo rm -rf "$i"
                    fi
                fi
    done

    # Pobieramy ostatni katalog backupu
            i=1
                    while [ $i -le $NUM_BACKUP ];
                            do
                                #statements
                                LAST_BACKUP=$(date +%u -d "$i day ago")

                                if [ -d $BACKUP_DIR/$LAST_BACKUP ]
                                then
                                    echo "Found newest backup: $LAST_BACKUP" >> $LOG
                                        break
                                fi
                                i=`expr $i + 1`
                    done

                        CURRENT_BACKUP=$(date +%u)
                        if [ ! -d $BACKUP_DIR/$CURRENT_BACKUP ]
                    then
                            mkdir -p $BACKUP_DIR/$CURRENT_BACKUP
                        fi

                        IGNORE_DIR="--exclude=*/sqlcache/* --exclude=*/templates_c/* --exclude=kustran/.cache/* --exclude=kustran/backup/swap --exclude=kustran/VirtualBox*"

                        echo "Backup dir = $BACKUP_DIR/$CURRENT_BACKUP" >> $LOG
                        cd $BACKUP_DIR/$CURRENT_BACKUP
                        sudo ping -c 2 $IP_ADDR || exit 1
                        rsync -avzh --progress $IGNORE_DIR --link-dest=$BACKUP_DIR/$LAST_BACKUP $IP_ADDR:$SOURCE_DIR $BACKUP_DIR/$CURRENT_BACKUP --del 2>&1 >> $LOG
cat $LOG