Drupal deployment strategy

single_dep.rb

# Requirements
# - You need drush installed on your project
# Current Features:
# - Revert all features
# - Backup database prior to deploy
# - Handle sites/default/files across releases
# - Clear cache
# TODO:
# - Automatic database updates

set :application, "YOUR APP"
set :deploy_via,  :remote_cache

set :scm, :git
set :repository, "GIT_REPO_URL"
set :branch,     "master"
set :user,       "DEPLOY USER NAME"
set :use_sudo,   false # Your deploy user should not need sudo permission

ssh_options[:forward_agent] = true

role :web, "www.example.com"                           # Your HTTP server, Apache/etc
role :app, "www.example.com"                           # This may be the same as your `Web` server
role :db,  "www.example.com", :primary => true

# Drupal Customizations
set :normalize_asset_timestamps, false

set :site_uri, "SITE URI TO USE WITH DRUSH"

set :drush_cmd, "drush --uri=#{site_uri}"

namespace :deploy do
  task :start do ; end
  task :stop do ; end
  task :restart do ; end

  desc "Backup the DB before this update"
  task :backup_db, :roles => :db do
    run "cd #{previous_release} && #{drush_cmd} sql-dump > dump.sql"
  end

  # Your default/files should not be under scm, but we'll help if you do
  desc "Move default drupal files if they exist and symlink to shared path"
  task :move_default_files, :roles => :app do
    run <<-CMD
      if [ -d #{release_path}/sites/default/files ]; then \
        cd #{release_path}/sites/default && \
        rsync -avz files/ #{shared_path}/files && \
        rm -rf files; \
      fi; \
      ln -nsf #{shared_path}/files .
    CMD
  end

  desc "Revert all features"
  task :revert_features, :roles => :db do
    run "cd #{current_path} && #{drush_cmd} features-revert-all" do |ch, stream, out|
      puts out if out =~ /The following/
      ch.send_data "y\n" if out =~ /Do you really want to continue?/
    end
  end

  desc "Clear all cache"
  task :clear_cache, :roles => :app do
    run "cd #{current_path} && #{drush_cmd} cache-clear all"
  end
end

after  "deploy:update_code", "deploy:backup_db"
before "deploy:symlink", "deploy:move_default_files"
before "deploy:symlink", "deploy:revert_features"
before "deploy:symlink", "deploy:clear_cache"