To set this up for a Rails 3 app on Mac OS X or Linux (Ubuntu was tested) please follow the procedure below.

Make sure bluepill is listed in your Gemfile and bundle it then:

cd YOUR_RAILS_APP
git submodule add git://github.com/johnae/rails_supervision.git runit ## or however you want to store this in your app
cd YOUR_RAILS_APP/runit
run install

you should now be able to run ./runit/bp status

above command will most probably be faster if you install bluepill through rubygems (at least if running on ruby 1.9.2 which has a serious performance issue with require)

for bluepills status of your app

more importantly you should now be able to start and stop your app by running

sv start APP_NAME
sv stop APP_NAME
sv restart APP_NAME
sv hup APP_NAME ## this will send a USR2-signal to unicorn