db:clone_to_local Thanks engineyard!

database.rb

# require this file from your deploy.rb and you'll be able to db:clone_to_local

require 'eycap'

namespace :db do
  task :yml do
    set :database_yml, YAML.load(capture("cat #{shared_path}/config/database.yml"))[rails_env]
  end
end
before "db:backup_name", "db:yml"

set(:environment_database) { database_yml['database'] }
set(:environment_dbhost) { database_yml['host'] }
set(:dbuser) { database_yml['username'] }
set(:dbpass) { database_yml['password'] }