notify.rb

require 'etc'
require 'campfire'

namespace :notify do
  desc 'Alert Campfire of a deploy'
  task :campfire do
    branch_name = branch.split('/', 2).last
    deployer = Etc.getlogin
    deployed = `curl -s http://github.com/site/sha`[0,7]
    deploying = `git rev-parse HEAD`[0,7]
    compare_url = "#{source_repo_url}/compare/#{deployed}...#{deploying}"

    Campfire.notify(
      "#{deployer} is deploying " +
      "#{branch_name} (#{deployed}..#{deploying}) to #{rails_env} " +
      "with `cap #{ARGV.join(' ')}` (#{compare_url})"
    )
  end
end

before "deploy:update", "notify:campfire"