feat: Lösch-Synchronisation mit lokalem Backup und Bereinigung

Gelöschte Dateien werden beim Download ins Backup-Verzeichnis verschoben
(${LOCAL_PHOTO_DIR}-bak, ${LOCAL_DARKTABLE_DB_DIR}-bak) statt permanent
gelöscht. Upload verwendet --delete ohne Backup. Backups älter als 2 Jahre
werden automatisch bereinigt. Safeguard verhindert --delete bei leerem
Quellverzeichnis. validate_path prüft jetzt auch lokale Pfade.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/darktable_common.sh

@@ -59,6 +59,8 @@ validate_config() {
 
     validate_path SERVER_DB_DIR
     validate_path SERVER_PHOTO_DIR
+    validate_path LOCAL_DARKTABLE_DB_DIR
+    validate_path LOCAL_PHOTO_DIR
 
     # DARKTABLE_BIN: basename muss 'darktable' sein
     if [[ "$(basename "$DARKTABLE_BIN")" != "darktable" ]]; then
@@ -127,6 +129,18 @@ gelöscht:^\*deleting
 EOF
 }
 
+cleanup_old_backups() {
+    local backup_dir="$1"
+    [ -d "$backup_dir" ] || return 0
+    local count
+    count=$(find "$backup_dir" -type f -mtime +730 | wc -l)
+    if [ "$count" -gt 0 ]; then
+        log "Backup-Bereinigung: $count Datei(en) älter als 2 Jahre in $backup_dir"
+        find "$backup_dir" -type f -mtime +730 -delete
+        find "$backup_dir" -type d -empty -delete 2>/dev/null || true
+    fi
+}
+
 confirm_dry_run() {
     [ "${DRY_RUN_SKIP_CONFIRM:-0}" = "1" ] && return 0
     ask_user "Darktable Sync – Trockenlauf" \

scripts/darktable_sync.sh

@@ -180,6 +180,13 @@ TMPFILES+=("$DOWNLOAD_LOG_DB")
 DOWNLOAD_LOG_PHOTOS=$(mktemp)
 TMPFILES+=("$DOWNLOAD_LOG_PHOTOS")
 
+BACKUP_PHOTO_DIR="${LOCAL_PHOTO_DIR}-bak"
+BACKUP_DB_DIR="${LOCAL_DARKTABLE_DB_DIR}-bak"
+
+if [ "$DRY_RUN" = false ]; then
+    mkdir -p "$BACKUP_PHOTO_DIR" "$BACKUP_DB_DIR"
+fi
+
 RSYNC_DRY_FLAG=()
 [ "$DRY_RUN" = true ] && RSYNC_DRY_FLAG=(--dry-run)
 [ "$DRY_RUN" = true ] && DRY_SUFFIX=" (Trockenlauf)" || DRY_SUFFIX=""
@@ -191,7 +198,12 @@ if [ "$UPLOAD_ALLOWED" = true ]; then
     log_step "Upload: Datenbank${DRY_SUFFIX}"
     log "  Quelle: $LOCAL_DARKTABLE_DB_DIR/"
     log "  Ziel:   $SERVER_USER@$SERVER_IP:$SERVER_DB_DIR/"
-    if ! rsync -uavh --itemize-changes \
+    if [ -z "$(ls -A "$LOCAL_DARKTABLE_DB_DIR" 2>/dev/null)" ]; then
+        log_error "Upload abgebrochen: Quellverzeichnis leer ($LOCAL_DARKTABLE_DB_DIR). Falscher Mount?"
+        touch "$CONFIG_DIR/sync_pending"
+        exit 1
+    fi
+    if ! rsync -uavh --itemize-changes --delete \
         "${RSYNC_DRY_FLAG[@]}" \
         --exclude '*.lock' \
         --exclude 'darktable_version' \
@@ -208,7 +220,12 @@ if [ "$UPLOAD_ALLOWED" = true ]; then
     log_step "Upload: Fotos${DRY_SUFFIX}"
     log "  Quelle: $LOCAL_PHOTO_DIR/"
     log "  Ziel:   $SERVER_USER@$SERVER_IP:$SERVER_PHOTO_DIR/"
-    if ! rsync -uavh --itemize-changes \
+    if [ -z "$(ls -A "$LOCAL_PHOTO_DIR" 2>/dev/null)" ]; then
+        log_error "Upload abgebrochen: Quellverzeichnis leer ($LOCAL_PHOTO_DIR). Falscher Mount?"
+        touch "$CONFIG_DIR/sync_pending"
+        exit 1
+    fi
+    if ! rsync -uavh --itemize-changes --delete \
         "${RSYNC_DRY_FLAG[@]}" \
         --exclude '*.lock' \
         -e "ssh -p $SERVER_SSH_PORT" \
@@ -227,7 +244,9 @@ fi
 log_step "Download: Datenbank${DRY_SUFFIX}"
 log "  Quelle: $SERVER_USER@$SERVER_IP:$SERVER_DB_DIR/"
 log "  Ziel:   $LOCAL_DARKTABLE_DB_DIR/"
-if ! rsync -uavh --itemize-changes \
+log "  Backup: $BACKUP_DB_DIR/"
+if ! rsync -uavh --itemize-changes --delete \
+    --backup --backup-dir="$BACKUP_DB_DIR" \
     "${RSYNC_DRY_FLAG[@]}" \
     --exclude '*.lock' \
     -e "ssh -p $SERVER_SSH_PORT" \
@@ -243,7 +262,9 @@ log "Datenbank-Download abgeschlossen: $RECEIVED_DB Datei(en) empfangen."
 log_step "Download: Fotos${DRY_SUFFIX}"
 log "  Quelle: $SERVER_USER@$SERVER_IP:$SERVER_PHOTO_DIR/"
 log "  Ziel:   $LOCAL_PHOTO_DIR/"
-if ! rsync -uavh --itemize-changes \
+log "  Backup: $BACKUP_PHOTO_DIR/"
+if ! rsync -uavh --itemize-changes --delete \
+    --backup --backup-dir="$BACKUP_PHOTO_DIR" \
     "${RSYNC_DRY_FLAG[@]}" \
     --exclude '*.lock' \
     -e "ssh -p $SERVER_SSH_PORT" \
@@ -266,6 +287,10 @@ if [ "$DRY_RUN" = false ]; then
 
     rm -f "$CONFIG_DIR/sync_pending"
     log "sync_pending entfernt."
+
+    log_step "Backup-Bereinigung (älter als 2 Jahre)"
+    cleanup_old_backups "$BACKUP_PHOTO_DIR"
+    cleanup_old_backups "$BACKUP_DB_DIR"
 fi
 
 TOTAL_SENT=$((SENT_DB + SENT_PHOTOS))
@@ -283,8 +308,8 @@ if [ "$DRY_RUN" = true ]; then
     DN_DEL=$(  echo "$download_log" | grep -cE '^\*deleting' || echo 0)
 
     log_step "Trockenlauf-Ergebnis"
-    log "  Upload:   $UP_NEW neu | $UP_UPD aktualisiert | $UP_DEL gelöscht"
-    log "  Download: $DN_NEW neu | $DN_UPD aktualisiert | $DN_DEL gelöscht"
+    log "  Upload:   $UP_NEW neu | $UP_UPD aktualisiert | $UP_DEL gelöscht (Server)"
+    log "  Download: $DN_NEW neu | $DN_UPD aktualisiert | $DN_DEL gelöscht → Backup: $BACKUP_PHOTO_DIR"
 
     if [ "$((TOTAL_SENT + TOTAL_RECEIVED))" -gt 0 ]; then
         if ask_user "Details" "Details der zu übertragenden Dateien anzeigen?"; then