Shorten temp directory (#17901)

packages/core/src/config/storageMigration.ts

@@ -0,0 +1,44 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import * as fs from 'node:fs';
+import * as path from 'node:path';
+import { debugLogger } from '../utils/debugLogger.js';
+
+/**
+ * Migration utility to move data from old hash-based directories to new slug-based directories.
+ */
+export class StorageMigration {
+  /**
+   * Migrates a directory from an old path to a new path if the old one exists and the new one doesn't.
+   * @param oldPath The old directory path (hash-based).
+   * @param newPath The new directory path (slug-based).
+   */
+  static async migrateDirectory(
+    oldPath: string,
+    newPath: string,
+  ): Promise<void> {
+    try {
+      // If the new path already exists, we consider migration done or skipped to avoid overwriting.
+      // If the old path doesn't exist, there's nothing to migrate.
+      if (fs.existsSync(newPath) || !fs.existsSync(oldPath)) {
+        return;
+      }
+
+      // Ensure the parent directory of the new path exists
+      const parentDir = path.dirname(newPath);
+      await fs.promises.mkdir(parentDir, { recursive: true });
+
+      // Copy (safer and handles cross-device moves)
+      await fs.promises.cp(oldPath, newPath, { recursive: true });
+    } catch (e) {
+      debugLogger.debug(
+        `Storage Migration: Failed to move ${oldPath} to ${newPath}:`,
+        e,
+      );
+    }
+  }
+}