deployment with Capistrano 3 (affects foodcoops#148)

lib/capistrano/tasks/resque.cap

@@ -0,0 +1,24 @@
+
+# capistrano-resque could be used, but it does not support running resque as another user.
+# If you want to run resque as another user, setup sudo to allow running commands as that user:
+#   deploy   ALL=(foodsoft_user) NOPASSWD: ALL
+# and set `:run_user` to the foodsoft user.
+namespace :resque do
+
+  %w{start stop restart}.each do |action|
+    desc "#{action.capitalize} Resque workers"
+    task action => ['deploy:set_rails_env'] do
+      on roles(:resque), in: :groups do
+        within current_path do
+          cmd = command(:rake, "resque:#{action}_workers", "RAILS_ENV=#{fetch(:rails_env)}")
+          if fetch(:run_user).nil? or fetch(:run_user) == local_user
+            execute cmd
+          else
+            execute 'sudo', '-u', fetch(:run_user), cmd
+          end
+        end
+      end
+    end
+  end
+
+end