From 6fd0125ad9e2fc4eab2639f57136d8b15cffd744 Mon Sep 17 00:00:00 2001
From: Jack Nagel <jacknagel@gmail.com>
Date: Sun, 16 Feb 2014 22:24:33 -0500
Subject: [PATCH] Handle GitHub API authentication failures

---
 Library/Homebrew/utils.rb | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Library/Homebrew/utils.rb b/Library/Homebrew/utils.rb
index c6fe46a5ea..1377191dfb 100644
--- a/Library/Homebrew/utils.rb
+++ b/Library/Homebrew/utils.rb
@@ -254,6 +254,7 @@ module GitHub extend self
   Error = Class.new(StandardError)
   RateLimitExceededError = Class.new(Error)
   HTTPNotFoundError = Class.new(Error)
+  AuthenticationFailedError = Class.new(Error)
 
   def open url, headers={}, &block
     # This is a no-op if the user is opting out of using the GitHub API.
@@ -288,6 +289,8 @@ module GitHub extend self
     end
 
     case e.io.status.first
+    when "401", "403"
+      raise AuthenticationFailedError, e.message, e.backtrace
     when "404"
       raise HTTPNotFoundError, e.message, e.backtrace
     else