Spree 1.3 has a fantastic pluggable authentication system. This gem configures Spree to use the built in (Devise) authentication in RefineryCMS, and allows you to share authentication between the two engines.

Gemfile:

gem 'spreefinery_core', :git => 'git://github.com/shoponrails/spreefinery_core.git'

Run bundler, then install Spree

bundle
rails g spree:install

Note: The Spree installer will automatically copy and run a migration from this gem. If you want to copy the migration manually, you can use the following command:

rake railties:install:migrations FROM=spreefinery_core

Optionally put this line at the top of config/routes.rb to use RefineryCMS for your home page:

root :to => "refinery/pages#home"

Start your application, and create a RefineryCMS user. You can then make yourself a Spree admin using the Rails console:

rails console
> Refinery::User.first.spree_roles << Spree::Role.find_or_create_by_name("admin")

All done! You should now be able to access Refinery at http://localhost:3000/refinery and Spree at http://localhost:3000/admin.