From 9d46823b5d00e78c6ffaaae731a9a7acf6bb2b14 Mon Sep 17 00:00:00 2001
From: Terence Lee <hone02@gmail.com>
Date: Thu, 22 Sep 2011 12:03:59 -0500
Subject: [PATCH] set env to let rails know we're precompiling

---
 actionpack/lib/sprockets/assets.rake     | 3 +++
 railties/test/application/assets_test.rb | 9 +++++++++
 2 files changed, 12 insertions(+)

diff --git a/actionpack/lib/sprockets/assets.rake b/actionpack/lib/sprockets/assets.rake
index e38ac6b489..7241671db0 100644
--- a/actionpack/lib/sprockets/assets.rake
+++ b/actionpack/lib/sprockets/assets.rake
@@ -1,6 +1,9 @@
 namespace :assets do
   desc "Compile all the assets named in config.assets.precompile"
   task :precompile do
+    # let rails know we're precompiling assets
+    ENV["RAILS_ASSETS_PRECOMPILE"] = 'true'
+
     # We need to do this dance because RAILS_GROUPS is used
     # too early in the boot process and changing here is already too late.
     if ENV["RAILS_GROUPS"].to_s.empty? || ENV["RAILS_ENV"].to_s.empty?
diff --git a/railties/test/application/assets_test.rb b/railties/test/application/assets_test.rb
index a62ef1e70e..c4a24f0f73 100644
--- a/railties/test/application/assets_test.rb
+++ b/railties/test/application/assets_test.rb
@@ -102,6 +102,15 @@ module ApplicationTests
       assert !File.exists?("#{app_path}/public/assets/something.min.css")
     end
 
+    test "precompile sets flag notifying rails its precompiling" do
+      compile = <<COMPILE
+raise "ENV RAILS_ASSETS_PRECOMPILE not set" unless ENV["RAILS_ASSETS_PRECOMPILE"]
+COMPILE
+      app_file "config/initializers/compile.rb", compile
+      Dir.chdir(app_path){ `bundle exec rake assets:precompile` }
+      assert $?.success?
+    end
+
     test "asset pipeline should use a Sprockets::Index when config.assets.digest is true" do
       add_to_config "config.assets.digest = true"
       add_to_config "config.action_controller.perform_caching = false"