From 26a076eef5e8e6f504e3b188c5a6348de50c8bab Mon Sep 17 00:00:00 2001
From: Jack Nagel <jacknagel@gmail.com>
Date: Sat, 18 May 2013 22:09:15 -0500
Subject: [PATCH] upgrade: tighten installed precondition

---
 Library/Homebrew/cmd/upgrade.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Library/Homebrew/cmd/upgrade.rb b/Library/Homebrew/cmd/upgrade.rb
index af2e4a0e1e..8a880fa5ea 100644
--- a/Library/Homebrew/cmd/upgrade.rb
+++ b/Library/Homebrew/cmd/upgrade.rb
@@ -25,7 +25,7 @@ module Homebrew extend self
       outdated = ARGV.formulae.select do |f|
         if f.installed?
           onoe "#{f}-#{f.installed_version} already installed"
-        elsif not f.rack.exist? or f.rack.children.empty?
+        elsif not f.rack.directory? or f.rack.subdirs.empty?
           onoe "#{f} not installed"
         else
           true