switchtower: the rails rake tasks now load ST directly, instead of invoking it via system

git-svn-id: http://svn.rubyonrails.org/rails/tools/switchtower@3336 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* The Rails rake tasks now load ST directly, instead of invoking it via system
+
 * Added ssh_options variable to configure the SSH connection parameters #2734 [jerrett@bravenet.com]
 
 * Require Net::SSH 1.0.3

lib/switchtower/cli.rb

@@ -120,7 +120,7 @@ module SwitchTower
         end
 
         opts.separator ""
-        opts.separator <<DETAIL.split(/\n/)
+        opts.separator <<-DETAIL.split(/\n/)
 You can use the --apply-to switch to generate a minimal set of switchtower
 scripts and recipes for an application. Just specify the path to the application
 as the argument to --apply-to, like this:

lib/switchtower/generators/rails/deployment/templates/switchtower.rake

@@ -2,24 +2,39 @@
 # A set of rake tasks for invoking the SwitchTower automation utility.
 # =============================================================================
 
+# Invoke the given actions via SwitchTower
+def switchtower_invoke(*actions)
+  begin
+    require 'rubygems'
+  rescue LoadError
+    # no rubygems to load, so we fail silently
+  end
+
+  require 'switchtower/cli'
+
+  args = %w[-vvvvv -r config/<%= recipe_file %>]
+  args.concat(actions.map { |act| ["-a", act.to_s] }.flatten)
+  SwitchTower::CLI.new(args).execute!
+end
+
 desc "Push the latest revision into production using the release manager"
 task :deploy do
-  system "switchtower -vvvv -r config/<%= recipe_file %> -a deploy"
+  switchtower_invoke :deploy
 end
 
 desc "Rollback to the release before the current release in production"
 task :rollback do
-  system "switchtower -vvvv -r config/<%= recipe_file %> -a rollback"
+  switchtower_invoke :rollback
 end
 
 desc "Describe the differences between HEAD and the last production release"
 task :diff_from_last_deploy do
-  system "switchtower -vvvv -r config/<%= recipe_file %> -a diff_from_last_deploy"
+  switchtower_invoke :diff_from_last_deploy
 end
 
 desc "Enumerate all available deployment tasks"
 task :show_deploy_tasks do
-  system "switchtower -r config/<%= recipe_file %> -a show_tasks"
+  switchtower_invoke :show_tasks
 end
 
 desc "Execute a specific action using the release manager"
@@ -28,6 +43,6 @@ task :remote_exec do
     raise "Please specify an action (or comma separated list of actions) via the ACTION environment variable"
   end
 
-  actions = ENV['ACTION'].split(",").map { |a| "-a #{a}" }.join(" ")
-  system "switchtower -vvvv -r config/<%= recipe_file %> #{actions}"
+  actions = ENV['ACTION'].split(",")
+  switchtower_invoke(*actions)
 end