Added Vlad deployment recipe

lib/bundler/vlad.rb

@@ -0,0 +1,38 @@
+# Vlad task for Bundler.
+#
+# Just add "require 'bundler/vlad'" in your Vlad deploy.rb, and
+# Bundler will be activated after each new deployment.
+
+namespace :vlad do
+  namespace :bundle do
+    desc <<-DESC
+      Install the current Bundler environment. By default, gems will be \
+      installed to the shared/bundle path. Gems in the development and \
+      test group will not be installed. The install command is executed \
+      with the --deployment and --quiet flags. You can override any of \
+      these defaults by setting the variables shown below. If Vlad \
+      can not find the 'bundle' cmd then you can override the bundle_cmd \
+      variable to specifiy which one it should use.
+
+        set :bundle_gemfile,      "Gemfile"
+        set :bundle_dir,          File.join(shared_path, 'bundle')
+        set :bundle_flags,        "--deployment --quiet"
+        set :bundle_without,      [:development, :test]
+        set :bundle_cmd,          "bundle" # e.g. change to "/opt/ruby/bin/bundle"
+    DESC
+    remote_task :install, :roles => :app do
+      bundle_dir     = Rake::RemoteTask.fetch(:bundle_dir, File.join(shared_path, 'bundle'))
+      bundle_without = [*Rake::RemoteTask.fetch(:bundle_without, [:development, :test])].compact
+      bundle_flags   = Rake::RemoteTask.fetch(:bundle_flags, "--deployment --quiet")
+      bundle_gemfile = Rake::RemoteTask.fetch(:bundle_gemfile, "Gemfile")
+      bundle_cmd     = Rake::RemoteTask.fetch(:bundle_cmd, "bundle")
+
+      args = ["--gemfile #{File.join(current_release, bundle_gemfile)}"]
+      args << "--path #{bundle_dir}" unless bundle_dir.to_s.empty?
+      args << bundle_flags.to_s
+      args << "--without #{bundle_without.join(" ")}" unless bundle_without.empty?
+
+      run "#{bundle_cmd} install #{args.join(' ')}"
+    end
+  end
+end