[DevTools] chore: read from build/COMMIT_SHA fle as fallback for commit hash

packages/react-devtools-extensions/utils.js

@@ -6,7 +6,7 @@
  */
 
 const {execSync} = require('child_process');
-const {readFileSync} = require('fs');
+const {existsSync, readFileSync} = require('fs');
 const {resolve} = require('path');
 
 const GITHUB_URL = 'https://github.com/facebook/react';
@@ -18,8 +18,26 @@ function getGitCommit() {
       .trim();
   } catch (error) {
     // Mozilla runs this command from a git archive.
-    // In that context, there is no Git revision.
-    return null;
+    // In that context, there is no Git context.
+    // Using the commit hash specified to download-experimental-build.js script as a fallback.
+
+    // Try to read from build/COMMIT_SHA file
+    const commitShaPath = resolve(__dirname, '..', '..', 'build', 'COMMIT_SHA');
+    if (!existsSync(commitShaPath)) {
+      throw new Error(
+        'Could not find build/COMMIT_SHA file. Did you run scripts/release/download-experimental-build.js script?',
+      );
+    }
+
+    try {
+      const commitHash = readFileSync(commitShaPath, 'utf8').trim();
+      // Return short hash (first 7 characters) to match abbreviated commit hash format
+      return commitHash.slice(0, 7);
+    } catch (readError) {
+      throw new Error(
+        `Failed to read build/COMMIT_SHA file: ${readError.message}`,
+      );
+    }
   }
 }