From fa6c858893c6da4b431b5b0b3d95494861326c8e Mon Sep 17 00:00:00 2001
From: Jonathan Balsano <jonathan.balsano@10gen.com>
Date: Thu, 5 Mar 2015 18:26:16 -0500
Subject: [PATCH] Change Repository.prototype.setHead to be asynchronous

Changes the descriptor file to convert setHead to be asynchronous and
return an error code. Also modifies the createBranch method to
waterfall promises from setHead into Checkout.head.
---
 generate/input/descriptor.json | 6 ++++++
 lib/repository.js              | 7 +++++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/generate/input/descriptor.json b/generate/input/descriptor.json
index 259faacd2..bb3b4514d 100644
--- a/generate/input/descriptor.json
+++ b/generate/input/descriptor.json
@@ -1463,6 +1463,12 @@
         },
         "git_repository_message": {
           "ignore": true
+        },
+        "git_repository_set_head": {
+          "isAsync": true,
+          "return": {
+            "isErrorCode": true
+          }
         }
       }
     },
diff --git a/lib/repository.js b/lib/repository.js
index 349e655b2..7d9b61990 100644
--- a/lib/repository.js
+++ b/lib/repository.js
@@ -807,8 +807,11 @@ Repository.prototype.checkoutBranch = function(branch, opts) {
 
     var name = ref.name();
 
-    repo.setHead(name, repo.defaultSignature(), "Switch HEAD to " + name);
-
+    return repo.setHead(name, 
+      repo.defaultSignature(), 
+      "Switch HEAD to " + name);
+  })
+  .then(function() {
     return Checkout.head(repo, opts);
   });
 };