From 1a75c517c8e1c0157b7696d0b7ae6f0f6a8a0fc1 Mon Sep 17 00:00:00 2001
From: mkristian <m.kristian@web.de>
Date: Mon, 12 Jul 2010 12:00:25 +0530
Subject: [PATCH] extended boot.rb to allow to customize the Gemfile name via an environment variable

---
 .../generators/rails/app/templates/config/boot.rb  |    5 +-
 .../test/application/initializers/bundler_test.rb  |   79 ++++++++++++++++++++
 2 files changed, 82 insertions(+), 2 deletions(-)
 create mode 100644 railties/test/application/initializers/bundler_test.rb

diff --git a/railties/lib/rails/generators/rails/app/templates/config/boot.rb b/railties/lib/rails/generators/rails/app/templates/config/boot.rb
index ab6cb37..3761e62 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/boot.rb
+++ b/railties/lib/rails/generators/rails/app/templates/config/boot.rb
@@ -3,11 +3,12 @@ require 'rubygems'
 # Set up gems listed in the Gemfile.
 gemfile = File.expand_path('../../Gemfile', __FILE__)
 begin
-  ENV['BUNDLE_GEMFILE'] = gemfile
+  # give preference to value from outside
+  ENV['BUNDLE_GEMFILE'] ||= gemfile
   require 'bundler'
   Bundler.setup
 rescue Bundler::GemNotFound => e
   STDERR.puts e.message
   STDERR.puts "Try running `bundle install`."
   exit!
-end if File.exist?(gemfile)
+end if File.exist?(gemfile) || ENV['BUNDLE_GEMFILE']
diff --git a/railties/test/application/initializers/bundler_test.rb b/railties/test/application/initializers/bundler_test.rb
new file mode 100644
index 0000000..f3e996b
--- /dev/null
+++ b/railties/test/application/initializers/bundler_test.rb
@@ -0,0 +1,79 @@
+require "fileutils"
+require 'test/unit'
+
+module ApplicationTests
+  class BundlerGemBooting < Test::Unit::TestCase
+
+    def setup
+      @base_path = "tmp/app"
+      FileUtils.mkdir_p(@base_path)
+      @config_path = File.join(@base_path, 'config')
+      FileUtils.mkdir_p(@config_path)
+      FileUtils.cp("lib/rails/generators/rails/app/templates/config/boot.rb", @config_path)
+    end
+
+    def gemfile(file, gem = nil)
+      if file
+        gemfile = File.join(@base_path, file)
+        File.open(gemfile, 'w') do |f|
+          f.puts "source 'http://rubygems.org'"
+          f.puts "gem '#{gem}', :require => '#{gem}'"
+        end
+        File.expand_path(gemfile)
+      else
+        Dir.glob(@base_path + "/Gemfile*").each do |f|
+          FileUtils.rm(f)
+        end
+      end
+    end
+
+    def mimic_boot_loader
+      FileUtils.cd(@config_path) do
+        load("boot.rb")
+      end
+    end
+
+    def test_bundler_setup
+      # delete all gemfiles
+      gemfile(nil)
+
+      mimic_boot_loader
+      
+      # verify there is no bundler
+      assert false == Object.const_defined?('Bundler')
+
+      # have a custom Gemfile
+      gem_file = gemfile('Gemfile.custom', 'builder')
+
+      mimic_boot_loader
+      
+      # still there is no Bundler
+      assert false == Object.const_defined?('Bundler')
+
+      # have a regular Gemfile
+      gemfile("Gemfile", "rdoc")
+      # and set the custom gemfile to be used
+      ENV['BUNDLE_GEMFILE'] = gem_file
+      
+      mimic_boot_loader
+      
+      # we have bundler now
+      assert Object.const_defined?('Bundler')
+
+      # the custom gemfile was used
+      Bundler.require
+      assert Object.const_defined?('Builder')
+      # the regular gemfile was not used
+      assert false == Object.const_defined?('RDoc')
+
+      # do not know how to "reuse" bundler with a new gemfile
+
+      # ENV['BUNDLE_GEMFILE'] = nil
+      # FileUtils.cd(@config_path) do
+      #   load("boot.rb")
+      # end
+      # Bundler.require
+      # assert true == Object.const_defined?('RDoc')
+    end
+  end
+end
-- 
1.7.0.4