Add PointWorld DROID recovery helper

recover_dataset_from_parts.sh

@@ -0,0 +1,214 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+usage() {
+  cat <<'EOF'
+Usage:
+  recover_dataset_from_parts.sh --packages <packaged_dir> [--out <restore_dir>] [options]
+
+Options:
+  --out <dir>                   Restore target directory (required unless --list-only)
+  --threads <n|0>               zstd decompression threads, 0 means auto (default: 0)
+  --include-prefix <rel_path>   Restore only matching archive groups (repeatable)
+  --exclude-prefix <rel_path>   Exclude matching archive groups (repeatable)
+  --list-only                   List archive groups after include/exclude filters and exit
+  --no-empty-dirs               Do not recreate known empty directories
+  -h, --help                    Show this help
+
+Behavior:
+  - Reassembles each *.tar.zst.part-* sequence in sorted order.
+  - Extracts each archive into --out (full or filtered subset).
+EOF
+}
+
+PACKAGES=""
+OUT=""
+THREADS="0"
+LIST_ONLY="0"
+NO_EMPTY_DIRS="0"
+INCLUDE_PREFIXES=()
+EXCLUDE_PREFIXES=()
+
+# Empty dirs in source that contain no files and therefore are not represented by tar payloads.
+KNOWN_EMPTY_DIRS=(
+  "behavior/flows/task-0036"
+  "behavior/flows/task-0037"
+  "behavior/flows/task-0041"
+  "behavior/flows/task-0042"
+  "behavior/flows/task-0043"
+  "behavior/flows/task-0048"
+  "behavior/flows/task-0049"
+)
+
+normalize_prefix() {
+  local p="$1"
+  while [[ "$p" == */ ]]; do
+    p="${p%/}"
+  done
+  printf '%s' "$p"
+}
+
+matches_prefix() {
+  local rel="$1"
+  shift
+  local p
+  for p in "$@"; do
+    [[ -z "$p" ]] && continue
+    if [[ "$rel" == "$p" || "$rel" == "$p/"* ]]; then
+      return 0
+    fi
+  done
+  return 1
+}
+
+matches_include_with_parents() {
+  local rel="$1"
+  if [[ ${#INCLUDE_PREFIXES[@]} -eq 0 ]]; then
+    return 0
+  fi
+  local p
+  for p in "${INCLUDE_PREFIXES[@]}"; do
+    if [[ "$rel" == "$p" || "$rel" == "$p/"* || "$p" == "$rel/"* ]]; then
+      return 0
+    fi
+  done
+  return 1
+}
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --packages)
+      PACKAGES="${2:-}"
+      shift 2
+      ;;
+    --out)
+      OUT="${2:-}"
+      shift 2
+      ;;
+    --threads)
+      THREADS="${2:-}"
+      shift 2
+      ;;
+    --include-prefix)
+      INCLUDE_PREFIXES+=("$(normalize_prefix "${2:-}")")
+      shift 2
+      ;;
+    --exclude-prefix)
+      EXCLUDE_PREFIXES+=("$(normalize_prefix "${2:-}")")
+      shift 2
+      ;;
+    --list-only)
+      LIST_ONLY="1"
+      shift
+      ;;
+    --no-empty-dirs)
+      NO_EMPTY_DIRS="1"
+      shift
+      ;;
+    -h|--help)
+      usage
+      exit 0
+      ;;
+    *)
+      echo "Unknown arg: $1" >&2
+      usage
+      exit 1
+      ;;
+  esac
+done
+
+if [[ -z "$PACKAGES" ]]; then
+  echo "--packages is required." >&2
+  usage
+  exit 1
+fi
+
+if [[ "$LIST_ONLY" != "1" && -z "$OUT" ]]; then
+  echo "--out is required unless --list-only is used." >&2
+  usage
+  exit 1
+fi
+
+PACKAGES="$(realpath "$PACKAGES")"
+if [[ -n "$OUT" ]]; then
+  OUT="$(realpath -m "$OUT")"
+fi
+
+if [[ ! -d "$PACKAGES" ]]; then
+  echo "Package directory not found: $PACKAGES" >&2
+  exit 1
+fi
+
+echo "[1/3] Discovering archive groups..."
+declare -A seen_stems=()
+while IFS= read -r -d '' part; do
+  stem_abs="${part%.part-*}"
+  stem_rel="${stem_abs#$PACKAGES/}"
+  seen_stems["$stem_rel"]=1
+done < <(find "$PACKAGES" -type f -name '*.tar.zst.part-*' -print0)
+
+if [[ ${#seen_stems[@]} -eq 0 ]]; then
+  echo "No archive parts found under: $PACKAGES" >&2
+  exit 1
+fi
+
+mapfile -t all_stems < <(printf '%s\n' "${!seen_stems[@]}" | sort)
+
+selected_stems=()
+for rel in "${all_stems[@]}"; do
+  if [[ ${#INCLUDE_PREFIXES[@]} -gt 0 ]]; then
+    if ! matches_prefix "$rel" "${INCLUDE_PREFIXES[@]}"; then
+      continue
+    fi
+  fi
+  if [[ ${#EXCLUDE_PREFIXES[@]} -gt 0 ]] && matches_prefix "$rel" "${EXCLUDE_PREFIXES[@]}"; then
+    continue
+  fi
+  selected_stems+=("$rel")
+done
+
+if [[ ${#selected_stems[@]} -eq 0 ]]; then
+  echo "No archive groups matched the include/exclude filters." >&2
+  exit 1
+fi
+
+if [[ "$LIST_ONLY" == "1" ]]; then
+  printf '%s\n' "${selected_stems[@]}"
+  exit 0
+fi
+
+mkdir -p "$OUT"
+
+echo "[2/3] Recreating known empty directories..."
+if [[ "$NO_EMPTY_DIRS" != "1" ]]; then
+  for rel in "${KNOWN_EMPTY_DIRS[@]}"; do
+    if ! matches_include_with_parents "$rel"; then
+      continue
+    fi
+    if [[ ${#EXCLUDE_PREFIXES[@]} -gt 0 ]] && matches_prefix "$rel" "${EXCLUDE_PREFIXES[@]}"; then
+      continue
+    fi
+    mkdir -p "$OUT/$rel"
+  done
+else
+  echo "Skipping empty directory recreation (--no-empty-dirs)."
+fi
+
+echo "[3/3] Reassembling and extracting ${#selected_stems[@]} archive groups..."
+for rel_stem in "${selected_stems[@]}"; do
+  stem="$PACKAGES/$rel_stem"
+  dir="$(dirname "$stem")"
+  base="$(basename "$stem")"
+  mapfile -t parts < <(find "$dir" -maxdepth 1 -type f -name "${base}.part-*" | sort)
+  if [[ ${#parts[@]} -eq 0 ]]; then
+    echo "No parts found for stem: $rel_stem" >&2
+    exit 1
+  fi
+
+  echo "Extracting: $rel_stem (${#parts[@]} parts)"
+  cat "${parts[@]}" \
+    | zstd -q -d -T"$THREADS" \
+    | tar -C "$OUT" -xf -
+done
+
+echo "Done. Restored dataset at: $OUT"