diagnostic: fix paths usage.

- Don't allow taking an argument. This doesn't work and never has as it
  caches the result regardless of the argument.
- Don't rely on the PATH to check for external commands.

1 files changed, 2 insertions, 2 deletions

diff --git a/Library/Homebrew/utils.rb b/Library/Homebrew/utils.rb
index 1d16044da..48ab94c4f 100644
--- a/Library/Homebrew/utils.rb
+++ b/Library/Homebrew/utils.rb
@@ -420,8 +420,8 @@ def nostdout
   end
 end
 
-def paths(env_path = ENV["PATH"])
-  @paths ||= PATH.new(env_path).collect do |p|
+def paths
+  @paths ||= PATH.new(ENV["HOMEBREW_PATH"]).collect do |p|
     begin
       File.expand_path(p).chomp("/")
     rescue ArgumentError