Only error out for `sudo brew install`

Note this only happens if Homebrew is *not* installed sudo. Which is most of the time true.

Fixes #6899

1 files changed, 6 insertions, 0 deletions

diff --git a/Library/Homebrew/cmd/install.rb b/Library/Homebrew/cmd/install.rb
index e31b1b35e..b7f9e7cae 100644
--- a/Library/Homebrew/cmd/install.rb
+++ b/Library/Homebrew/cmd/install.rb
@@ -9,6 +9,12 @@ module Homebrew extend self
       raise "No available formula for #{name}\n#{msg}" if msg
     end unless ARGV.force?
 
+    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 install'"
+    end
+
     install_formulae ARGV.formulae
   end