Audit formulæ for easy-install.pth files

Closes #32860.

1 files changed, 13 insertions, 0 deletions

diff --git a/Library/Homebrew/formula_cellar_checks.rb b/Library/Homebrew/formula_cellar_checks.rb
index f639c2046..372fcca87 100644
--- a/Library/Homebrew/formula_cellar_checks.rb
+++ b/Library/Homebrew/formula_cellar_checks.rb
@@ -120,6 +120,19 @@ module FormulaCellarChecks
      "The offending files are:  \n  #{files * "\n  "}"]
   end
 
+  def check_easy_install_pth lib
+    pth_found = Dir["#{lib}/python{2.7,3.4}/site-packages/easy-install.pth"].map { |f| File.dirname(f) }
+    return if pth_found.empty?
+
+    ["easy-install.pth files were found in #{pth_found.join(", ")}.",
+      <<-EOS.undent
+        These .pth files are likely to cause link conflicts. Please
+        invoke setup.py with options --single-version-externally-managed
+        --record=install.txt.
+      EOS
+    ]
+  end
+
   private
 
   def relative_glob(dir, pattern)