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+# This defines a deployment "recipe" that you can feed to switchtower
+# (http://manuals.rubyonrails.com/read/book/17). It allows you to automate
+# (among other things) the deployment of your application.
+
+# =============================================================================
+# REQUIRED VARIABLES
+# =============================================================================
+# You must always specify the application and repository for every recipe. The
+# repository must be the URL of the repository you want this recipe to
+# correspond to. The deploy_to path must be the path on each machine that will
+# form the root of the application path.
+
+set :application, "<%= File.basename(destination_root) %>"
+set :repository, "http://svn.yourhost.com/#{application}/trunk"
+
+# =============================================================================
+# ROLES
+# =============================================================================
+# You can define any number of roles, each of which contains any number of
+# machines. Roles might include such things as :web, or :app, or :db, defining
+# what the purpose of each machine is. You can also specify options that can
+# be used to single out a specific subset of boxes in a particular role, like
+# :primary => true.
+
+role :web, "www01.example.com", "www02.example.com"
+role :app, "app01.example.com", "app02.example.com", "app03.example.com"
+role :db,  "db01.example.com", :primary => true
+role :db,  "db02.example.com", "db03.example.com"
+
+# =============================================================================
+# OPTIONAL VARIABLES
+# =============================================================================
+# set :deploy_to, "/path/to/app" # defaults to "/u/apps/#{application}"
+# set :user, "flippy"            # defaults to the currently logged in user
+# set :scm, :darcs               # defaults to :subversion
+# set :svn, "/path/to/svn"       # defaults to searching the PATH
+# set :darcs, "/path/to/darcs"   # defaults to searching the PATH
+# set :gateway, "gate.host.com"  # default to no gateway
+
+# =============================================================================
+# TASKS
+# =============================================================================
+# Define tasks that run on all (or only some) of the machines. You can specify
+# a role (or set of roles) that each task should be executed on. You can also
+# narrow the set of servers to a subset of a role by specifying options, which
+# must match the options given for the servers to select (like :primary => true)
+
+desc <<DESC
+An imaginary backup task. (Execute the 'show_tasks' task to display all
+available tasks.)
+DESC
+task :backup, :roles => :db, :only => { :primary => true } do
+  # the on_rollback handler is only executed if this task is executed within
+  # a transaction (see below), AND it or a subsequent task fails.
+  on_rollback { delete "/tmp/dump.sql" }
+
+  run "mysqldump -u theuser -p thedatabase > /tmp/dump.sql" do |ch, stream, out|
+    ch.send_data "thepassword\n" if out =~ /^Enter password:/
+  end
+end
+
+# Tasks may take advantage of several different helper methods to interact
+# with the remote server(s). These are:
+#
+# * run(command, options={}, &block): execute the given command on all servers
+#   associated with the current task, in parallel. The block, if given, should
+#   accept three parameters: the communication channel, a symbol identifying the
+#   type of stream (:err or :out), and the data. The block is invoked for all
+#   output from the command, allowing you to inspect output and act
+#   accordingly.
+# * sudo(command, options={}, &block): same as run, but it executes the command
+#   via sudo.
+# * delete(path, options={}): deletes the given file or directory from all
+#   associated servers. If :recursive => true is given in the options, the
+#   delete uses "rm -rf" instead of "rm -f".
+# * put(buffer, path, options={}): creates or overwrites a file at "path" on
+#   all associated servers, populating it with the contents of "buffer". You
+#   can specify :mode as an integer value, which will be used to set the mode
+#   on the file.
+# * render(template, options={}) or render(options={}): renders the given
+#   template and returns a string. Alternatively, if the :template key is given,
+#   it will be treated as the contents of the template to render. Any other keys
+#   are treated as local variables, which are made available to the (ERb)
+#   template.
+
+desc "Demonstrates the various helper methods available to recipes."
+task :helper_demo do
+  # "setup" is a standard task which sets up the directory structure on the
+  # remote servers. It is a good idea to run the "setup" task at least once
+  # at the beginning of your app's lifetime (it is non-destructive).
+  setup
+
+  buffer = render("maintenance.rhtml", :deadline => ENV['UNTIL'])
+  put buffer, "#{shared_path}/system/maintenance.html", :mode => 0644
+  sudo "killall -USR1 dispatch.fcgi"
+  run "#{release_path}/script/spin"
+  delete "#{shared_path}/system/maintenance.html"
+end
+
+# You can use "transaction" to indicate that if any of the tasks within it fail,
+# all should be rolled back (for each task that specifies an on_rollback
+# handler).
+
+desc "A task demonstrating the use of transactions."
+task :long_deploy do
+  transaction do
+    update_code
+    disable_web
+    symlink
+    migrate
+  end
+
+  restart
+  enable_web
+end