From 23031886148832f04323435f1a7a73d7d71918a8 Mon Sep 17 00:00:00 2001
From: Adam Barth <abarth@chromium.org>
Date: Thu, 7 Jan 2016 10:25:38 -0800
Subject: [PATCH] Handle trying to upgrade Flutter with no upstream

Fixes #1084
---
 packages/flutter_tools/lib/src/commands/upgrade.dart | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/packages/flutter_tools/lib/src/commands/upgrade.dart b/packages/flutter_tools/lib/src/commands/upgrade.dart
index 104aeee888..3258edf31b 100644
--- a/packages/flutter_tools/lib/src/commands/upgrade.dart
+++ b/packages/flutter_tools/lib/src/commands/upgrade.dart
@@ -14,7 +14,16 @@ class UpgradeCommand extends FlutterCommand {
 
   @override
   Future<int> runInProject() async {
-    int code = await runCommandAndStreamOutput([
+    try {
+      runCheckedSync(<String>[
+        'git', 'rev-parse', '@{u}'
+      ], workingDirectory: ArtifactStore.flutterRoot);
+    } catch (e) {
+      print('Unable to upgrade Flutter. No upstream repository configured for Flutter.');
+      return 1;
+    }
+
+    int code = await runCommandAndStreamOutput(<String>[
       'git', 'pull', '--ff-only'
     ], workingDirectory: ArtifactStore.flutterRoot);