Update 1/25/07: Francois pointed out that now as of Piston 1.3.0 you can now do this all with the following command:
piston switch http://dev.rubyonrails.org/svn/rails/tags/rel_1-2-1 vendor/rails
For starters, if you’re still using svn:externals to manage your vendor/rails directory it’s time to switch to using Piston. svn:externals is so Q4!
However, if you’re already running Piston, now that Rails 1.2 is out you may want to switch from running Edge (the trunk or head branch) to the stable 1.2 release for your production applications. Here’s how to make the switch with Subversion and Piston:
cd your_app # Remove the old Piston checkout svn delete vendor/rails svn commit -m "Deleted edge" vendor/rails svn update # Checkout 1.2.1 (or newer) piston import http://dev.rubyonrails.org/svn/rails/tags/rel_1-2-1 vendor/rails svn commit -m "Rails 1.2.1" vendor/rails