From 47d57ca99526d47897a0bbe98a1f6a5ba466167f Mon Sep 17 00:00:00 2001
From: Tim D. Smith
Date: Tue, 4 Oct 2016 09:47:14 -0700
Subject: Immortalize virtualenvs better

virtualenvs remember the prefix of the python that created them and do
magic to load packages from them; help them remember a more durable
path.
---
 Library/Homebrew/language/python.rb | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'Library')

diff --git a/Library/Homebrew/language/python.rb b/Library/Homebrew/language/python.rb
index b28b1ca60..23c5246ba 100644
--- a/Library/Homebrew/language/python.rb
+++ b/Library/Homebrew/language/python.rb
@@ -215,6 +215,13 @@ module Language
             f.unlink
             f.make_symlink new_target
           end
+
+          Pathname.glob(@venv_root/"lib/python*/orig-prefix.txt").each do |prefix_file|
+            prefix_path = prefix_file.read
+            python = prefix_path.include?("python3") ? "python3" : "python"
+            prefix_path.sub! %r{^#{HOMEBREW_CELLAR}/#{python}/[^/]+}, Formula[python].opt_prefix
+            prefix_file.atomic_write prefix_path
+          end
         end
 
         # Installs packages represented by `targets` into the virtualenv.
-- 
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