Don't allow `brew link` to be run as sudo

1 files changed, 6 insertions, 0 deletions

diff --git a/Library/Homebrew/cmd/link.rb b/Library/Homebrew/cmd/link.rb
index d222f3d25..df3445aa5 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?