Prepare MariaDB restore tests and recover backup disk space safely

usr-local-sbin/app-backup.sh

@@ -9,12 +9,14 @@ source "$LIB_DIR/common.sh"
 CONFIG_FILE=/etc/app-backup/app-backup.conf
 CHECK=false
 SKIP_RETENTION=false
+PREPARE_SPACE=false
 while (( $# )); do
   case $1 in
     --config) CONFIG_FILE=${2:?Missing config path}; shift 2 ;;
     --check) CHECK=true; shift ;;
+    --prepare-space) PREPARE_SPACE=true; CHECK=true; shift ;;
     --no-retention) SKIP_RETENTION=true; shift ;;
-    --help) echo 'Usage: app-backup.sh [--config FILE] [--check] [--no-retention]'; exit 0 ;;
+    --help) echo 'Usage: app-backup.sh [--config FILE] [--check | --prepare-space] [--no-retention]'; exit 0 ;;
     *) die "Unknown argument: $1" ;;
   esac
 done
@@ -22,6 +24,9 @@ OPERATION=backup
 load_config
 init_runtime
 build_plan
+# shellcheck source=lib/space.sh
+source "$LIB_DIR/space.sh"
+if [[ $CHECK == false || $PREPARE_SPACE == true ]]; then prepare_backup_space; fi
 preflight
 if [[ $CHECK == true ]]; then
   echo 'Preflight passed. Directory metadata probed; no application backup, service stop or upload performed.'
@@ -75,6 +80,9 @@ assert_services_quiescent
 echo '-- Copy window complete; writer guards verified'
 BACKUP_PHASE='Dienste wiederherstellen'
 resume_services || die 'Failed to resume original service state'
+if [[ $ENABLE_MAIL_REPORT == true ]]; then
+  python3 "$LIB_DIR/report.py" snapshot "$LOG_DIR/report_$RUN_ID.sizes.json" "$STAGING_DIR" "$PARTIAL_DIR" || echo 'WARNING: Report sizes unavailable'
+fi
 
 while IFS=$'\t' read -r label _; do
   if [[ $label == meta ]]; then root=meta
@@ -93,6 +101,9 @@ while IFS=$'\t' read -r label _; do
       gzip -6 -c > "$out.partial"
   fi
   mv -- "$out.partial" "$out"
+  helper tar "$out" "$root"
+  # Retain small metadata/plan for publication and recognized crash recovery.
+  if [[ $label != meta ]]; then rm -rf -- "${STAGING_DIR:?}/$root"; fi
 done < "$PLAN"
 BACKUP_PHASE='Lokale Archivprüfung'
 helper create "$PARTIAL_DIR" "$RUN_ID" "$PLAN"