From f7d7fb1e812d443ec739938956ebb1452a262387 Mon Sep 17 00:00:00 2001
From: Max Howell <max@methylblue.com>
Date: Sun, 4 Mar 2012 02:47:53 +0000
Subject: [PATCH] Don't allow `brew link` to be run as sudo

---
 Library/Homebrew/cmd/link.rb | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Library/Homebrew/cmd/link.rb b/Library/Homebrew/cmd/link.rb
index d222f3d256..df3445aa50 100644
--- a/Library/Homebrew/cmd/link.rb
+++ b/Library/Homebrew/cmd/link.rb
@@ -2,6 +2,12 @@ module Homebrew extend self
   def link
     raise KegUnspecifiedError if ARGV.named.empty?
 
+    if Process.uid.zero? and not File.stat(HOMEBREW_BREW_FILE).uid.zero?
+      # note we only abort if Homebrew is *not* installed as sudo and the user
+      # calls brew as root. The fix is to chown brew to root.
+      abort "Cowardly refusing to `sudo brew link'"
+    end
+
     ARGV.kegs.each do |keg|
       print "Linking #{keg}... "
       puts if ARGV.verbose?