Rename archive unpack script

scripts/unpack_data.sh

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+ARCHIVE_DIR="${ROOT_DIR}/data"
+DATA_ROOT="${1:-${ROOT_DIR}/data}"
+EXPECTED_BASES=(
+  "test_videos"
+  "train_videos"
+)
+
+mkdir -p "${DATA_ROOT}"
+
+archives=()
+for base in "${EXPECTED_BASES[@]}"; do
+  matches=()
+  for suffix in ".tar" ".tar.zst"; do
+    candidate="${ARCHIVE_DIR}/${base}${suffix}"
+    if [[ -f "${candidate}" ]]; then
+      matches+=("${candidate}")
+    fi
+  done
+
+  if [[ "${#matches[@]}" -eq 0 ]]; then
+    echo "missing expected archive under ${ARCHIVE_DIR}: ${base}.tar or ${base}.tar.zst" >&2
+    exit 1
+  fi
+  if [[ "${#matches[@]}" -gt 1 ]]; then
+    echo "found multiple archive variants for ${base} under ${ARCHIVE_DIR}; keep only one of .tar or .tar.zst" >&2
+    exit 1
+  fi
+
+  archives+=("${matches[0]}")
+done
+
+for archive in "${archives[@]}"; do
+  echo "extracting ${archive}"
+  case "${archive}" in
+    *.tar.zst)
+      tar --zstd -xf "${archive}" -C "${DATA_ROOT}"
+      ;;
+    *.tar)
+      tar -xf "${archive}" -C "${DATA_ROOT}"
+      ;;
+    *)
+      echo "unsupported archive format: ${archive}" >&2
+      exit 1
+      ;;
+  esac
+done
+
+echo "raw data extracted into ${DATA_ROOT}"