support standard github release archives format (#9265)

packages/cli/src/config/extensions/github.ts

@@ -16,7 +16,7 @@ import * as https from 'node:https';
 import * as fs from 'node:fs';
 import * as path from 'node:path';
 import { execSync } from 'node:child_process';
-import { loadExtension } from '../extension.js';
+import { EXTENSIONS_CONFIG_FILENAME, loadExtension } from '../extension.js';
 import { quote } from 'shell-quote';
 
 function getGitHubToken(): string | undefined {
@@ -273,6 +273,34 @@ export async function downloadFromGitHubRelease(
 
     extractFile(downloadedAssetPath, destination);
 
+    // For regular github releases, the repository is put inside of a top level
+    // directory. In this case we should see exactly two file in the destination
+    // dir, the archive and the directory. If we see that, validate that the
+    // dir has a gemini extension configuration file and then move all files
+    // from the directory up one level into the destination directory.
+    const entries = await fs.promises.readdir(destination, {
+      withFileTypes: true,
+    });
+    if (entries.length === 2) {
+      const lonelyDir = entries.find((entry) => entry.isDirectory());
+      if (
+        lonelyDir &&
+        fs.existsSync(
+          path.join(destination, lonelyDir.name, EXTENSIONS_CONFIG_FILENAME),
+        )
+      ) {
+        const dirPathToExtract = path.join(destination, lonelyDir.name);
+        const extractedDirFiles = await fs.promises.readdir(dirPathToExtract);
+        for (const file of extractedDirFiles) {
+          await fs.promises.rename(
+            path.join(dirPathToExtract, file),
+            path.join(destination, file),
+          );
+        }
+        await fs.promises.rmdir(dirPathToExtract);
+      }
+    }
+
     await fs.promises.unlink(downloadedAssetPath);
     return {
       tagName: releaseData.tag_name,