Flesh out rake gems:unpack to unpack all gems, and add rake gems:build for native extensions. Closes #11513 [ddollar]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@9215 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

4 files changed, 40 insertions, 8 deletions

diff --git a/railties/CHANGELOG b/railties/CHANGELOG
index 90e3a48102..dfa80e1e82 100644
--- a/railties/CHANGELOG
+++ b/railties/CHANGELOG
@@ -1,5 +1,13 @@
 *SVN*
 
+* Flesh out rake gems:unpack to unpack all gems, and add rake gems:build for native extensions.  [ddollar]
+
+  rake gems:unpack             # unpacks all gems
+  rake gems:unpack GEM=mygem   # unpacks only the gem 'mygem'
+  
+  rake gems:build              # builds all unpacked gems
+  rake gems:build GEM=mygem    # builds only the gem 'mygem'
+
 * Add config.active_support for future configuration options.  Also, add more new Rails 3 config settings to new_rails_defaults.rb [rick]
 
 * Add Rails.logger, Rails.root, Rails.env and Rails.cache shortcuts for RAILS_* constants [pratik]
diff --git a/railties/lib/initializer.rb b/railties/lib/initializer.rb
index 8a5ca6f91b..61fcddc5f0 100644
--- a/railties/lib/initializer.rb
+++ b/railties/lib/initializer.rb
@@ -7,6 +7,7 @@ require 'railties_path'
 require 'rails/version'
 require 'rails/plugin/locator'
 require 'rails/plugin/loader'
+require 'rails/gem_builder'
 require 'rails/gem_dependency'
 
 
diff --git a/railties/lib/rails/gem_dependency.rb b/railties/lib/rails/gem_dependency.rb
index f9c37cb70a..8d6a748e4c 100644
--- a/railties/lib/rails/gem_dependency.rb
+++ b/railties/lib/rails/gem_dependency.rb
@@ -33,6 +33,10 @@ module Rails
     rescue Gem::LoadError
       puts $!.to_s
     end
+    
+    def gem_dir(base_directory)
+      File.join(base_directory, specification.full_name)
+    end
 
     def load
       return if @loaded || @load_paths_added == false
@@ -54,12 +58,24 @@ module Rails
     def install
       Gem::GemRunner.new.run(install_command)
     end
+    
+    def specification
+      @spec ||= Gem.source_index.search(Gem::Dependency.new(@name, @requirement)).sort_by { |s| s.version }.last
+    end
 
     def unpack_to(directory)
       FileUtils.mkdir_p directory
       Dir.chdir directory do
         Gem::GemRunner.new.run(unpack_command)
       end
+      
+      # copy the gem's specification into GEMDIR/.specification so that
+      # we can access information about the gem on deployment systems
+      # without having the gem installed
+      spec_filename = File.join(gem_dir(directory), '.specification')
+      File.open(spec_filename, 'w') do |file|
+        file.puts specification.to_yaml
+      end
     end
 
     def install_command
diff --git a/railties/lib/tasks/gems.rake b/railties/lib/tasks/gems.rake
index 198f6050c3..8f3fc51635 100644
--- a/railties/lib/tasks/gems.rake
+++ b/railties/lib/tasks/gems.rake
@@ -6,6 +6,18 @@ task :gems => :environment do
 end
 
 namespace :gems do
+  desc "Build any native extensions for unpacked gems"
+  task :build do
+    Dir[File.join(RAILS_ROOT, 'vendor', 'gems', '*')].each do |gem_dir|
+      spec_file = File.join(gem_dir, '.specification')
+      next unless File.exists?(spec_file)
+      specification = YAML::load_file(spec_file)
+      next unless ENV['GEM'].blank? || ENV['GEM'] == specification.name
+      Rails::GemBuilder.new(specification, gem_dir).build_extensions
+      puts "Built gem: '#{gem_dir}'"
+    end
+  end
+  
   desc "Installs all required gems for this application."
   task :install => :environment do
     require 'rubygems'
@@ -15,17 +27,12 @@ namespace :gems do
 
   desc "Unpacks the specified gem into vendor/gems."
   task :unpack do
-    raise "Specify name of gem in the config.gems array with GEM=" if ENV['GEM'].blank?
     Rake::Task["environment"].invoke
     require 'rubygems'
     require 'rubygems/gem_runner'
-    unless Rails.configuration.gems.select do |gem|
-      if gem.loaded? && gem.name == ENV['GEM']
-        gem.unpack_to(File.join(RAILS_ROOT, 'vendor', 'gems'))
-        true
-      end
-    end.any?
-      puts "No gem named #{ENV['GEM'].inspect} found."
+    Rails.configuration.gems.each do |gem|
+      next unless ENV['GEM'].blank? || ENV['GEM'] == gem.name
+      gem.unpack_to(File.join(RAILS_ROOT, 'vendor', 'gems')) if gem.loaded?
     end
   end
 end
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