From 1aa179ad9a835ba56e8f5e8eb85489ca7a9dd131 Mon Sep 17 00:00:00 2001
From: Mike McQuaid <mike@mikemcquaid.com>
Date: Thu, 26 Jan 2017 15:26:42 +0000
Subject: [PATCH] formula_cellar_checks: check for prefix/etc.

This directory indicates that configuration files have been installed
into the wrong location.
---
 Library/Homebrew/formula_cellar_checks.rb | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Library/Homebrew/formula_cellar_checks.rb b/Library/Homebrew/formula_cellar_checks.rb
index 7db5e748b8..f72f36c486 100644
--- a/Library/Homebrew/formula_cellar_checks.rb
+++ b/Library/Homebrew/formula_cellar_checks.rb
@@ -153,6 +153,16 @@ module FormulaCellarChecks
     EOS
   end
 
+  def check_etc
+    bad_etc = (formula.prefix/"etc")
+    return unless bad_etc.directory?
+    <<-EOS.undent
+      #{bad_etc} exists!
+      The contents should instead be installed into:
+      #{formula.etc}
+    EOS
+  end
+
   def audit_installed
     audit_check_output(check_manpages)
     audit_check_output(check_infopages)
@@ -165,6 +175,7 @@ module FormulaCellarChecks
     audit_check_output(check_easy_install_pth(formula.lib))
     audit_check_output(check_elisp_dirname(formula.share, formula.name))
     audit_check_output(check_elisp_root(formula.share, formula.name))
+    audit_check_output(check_etc)
   end
   alias generic_audit_installed audit_installed