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# file-rentention
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This script is intendet to be used to delete files, created by a backup-script for example. The rentention will be processes by a timeplan (days, weeks, months to keep).
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More Information is available on the mentioned website.
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155
backup-rentention.sh
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155
backup-rentention.sh
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#!/bin/bash
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# Script:
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# Version: 1.0
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# Autor: Marco Morath
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# Lizenz: Gnu GPLv3 <https://www.gnu.org/licenses/gpl-3.0.html>
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# Anwenderhinweis:
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# Wird der Parameter dryrun mit übergeben, wird keine Löschung durchgeführt. Es wird nur ermittelt, welche Dateien
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# gelöscht werden, wenn das Skript tatsächlich ausgeführt wird.
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# Verzeichnis mit den Backups
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backup_dir="/mnt/backupfolder"
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# Ältere Backups behalten: 14 tägliche, 13 wöchentliche, 12 monatliche
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daily_keep=14
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weekly_keep=13
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monthly_keep=12
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# Log-Verzeichnis und -Datei
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log_dir="/home/user/logdirectory"
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log_file="$log_dir/$(date +%Y-%m-%d)-backup-retention.log"
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# Logrotation
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log_files=($(ls -1tr $log_dir/*backup-retention*.log))
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log_keep=14
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# Alte Logdateien löschen
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if [ ${#log_files[@]} -gt $log_keep ]; then
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for log in "${log_files[@]:0:$((${#log_files[@]} - $log_keep))}"; do
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echo "Lösche Logdatei: $log"
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rm -f "$log"
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done
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fi
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# Neues Logfile erstellen
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touch "$log_file"
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# Liste der Backups in umgekehrter Reihenfolge nach Erstellungsdatum (älteste zuerst)
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backups=($(ls -1tr --time=ctime $backup_dir))
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# Arrays für die zu behaltenden Backups
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daily_backups=()
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weekly_backups=()
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monthly_backups=()
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# Datumswerte
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today_in_seconds=$(date +%s)
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daily_oldest_in_seconds=$(( $today_in_seconds - ( 86400 * $daily_keep ) ))
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weekly_oldest_in_seconds=$(( $today_in_seconds - ( 86400 * 7 * $weekly_keep ) ))
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monthly_oldest_in_seconds=$(( $today_in_seconds - ( 86400 * 30 * $monthly_keep ) ))
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# Funktion, um die Woche eines Datums zu berechnen
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get_week_of_year() {
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date -d "@$1" +%Y-%V
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}
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# Funktion, um den Monat eines Datums zu berechnen
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get_month_of_year() {
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date -d "@$1" +%Y-%m
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}
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# Backup-Kategorisierung
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declare -A weekly_latest
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declare -A monthly_latest
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for backup in "${backups[@]}"; do
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backup_date_seconds=$(stat -c %Y "$backup_dir/$backup")
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if [ $backup_date_seconds -ge $daily_oldest_in_seconds ]; then
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daily_backups+=($backup)
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elif [ $backup_date_seconds -ge $weekly_oldest_in_seconds ]; then
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week_of_year=$(get_week_of_year $backup_date_seconds)
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if [[ -z "${weekly_latest[$week_of_year]}" || $backup_date_seconds -gt $(stat -c %Y "$backup_dir/${weekly_latest[$week_of_year]}") ]]; then
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weekly_latest[$week_of_year]=$backup
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fi
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elif [ $backup_date_seconds -ge $monthly_oldest_in_seconds ]; then
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month_of_year=$(get_month_of_year $backup_date_seconds)
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if [[ -z "${monthly_latest[$month_of_year]}" || $backup_date_seconds -gt $(stat -c %Y "$backup_dir/${monthly_latest[$month_of_year]}") ]]; then
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monthly_latest[$month_of_year]=$backup
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fi
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fi
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done
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# Jüngste wöchentliche und monatliche Backups in Arrays speichern
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for backup in "${weekly_latest[@]}"; do
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weekly_backups+=($backup)
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done
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for backup in "${monthly_latest[@]}"; do
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monthly_backups+=($backup)
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done
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# Alle zu behaltenden Backups zusammenführen
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keep_backups=("${daily_backups[@]}" "${weekly_backups[@]}" "${monthly_backups[@]}")
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# Funktion zum Protokollieren
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log() {
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echo "$1" | tee -a "$log_file"
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}
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# Beginn des Vorgangs dokumentieren
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log "##### Bereinigung begonnen ( $(date +"%d-%m-%Y %H:%M:%S") ) #####"
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# Überprüfen, ob der Parameter "dryrun" gesetzt ist
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dryrun=false
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if [ "$1" == "dryrun" ]; then
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dryrun=true
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log "Dry run aktiviert: Es werden keine Backups gelöscht."
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fi
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# Backups zum Behalten ermitteln
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echo "==== Zu behaltende Backups ===="
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number=0
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for backup in "${backups[@]}"; do
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if [[ " ${keep_backups[@]} " =~ " $backup " ]]; then
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number=$(($number+1))
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if $dryrun; then
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log "$number Würde behalten: $backup"
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else
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log "$number Behalte Backup: $backup"
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fi
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fi
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done
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# Backups zum Löschen ermitteln
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echo "==== Zu löschende Backups ===="
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number=0
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for backup in "${backups[@]}"; do
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if [[ ! " ${keep_backups[@]} " =~ " $backup " ]]; then
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number=$(($number+1))
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if $dryrun; then
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log "$number Würde löschen: $backup"
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else
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log "$number Lösche Backup: $backup"
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rm -f "$backup_dir/$backup"
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fi
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fi
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done
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log "##### Backup-Bereinigung abgeschlossen ( $(date +"%d-%m-%Y %H:%M:%S") ) #####"
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