Super Simple Git, Bundler and Unicorn deploys

deploy.rake

namespace :deploy do
  
  def config(key)
    (@config ||= YAML.load_file("config/deploy.yml").symbolize_keys)[key.to_sym]
  end
  
  # Hooks as needed
  
  task :local_before do
  end
  
  task :local_after do
  end
  
  task :remote_before do
  end
  
  task :remote_after do
  end
  
  # Actual deploy
  
  desc "Runs a local deploy"
  task :local do
    Rake::Task["deploy:local_before"].invoke
    system "gem bundle"
    if File.exist?("tmp/pids/unicorn.pid")
      begin
        pid = File.read("tmp/pids/unicorn.pid").to_i
        Process.kill(:USR2, pid)
      rescue Errno::ENOENT, Errno::ESRCH
      end
      puts "Found pid, attempted to restart."
    else
      puts "Couldn't find a pid."
    end
    Rake::Task["deploy:local_after"].invoke
  end
  
  desc "Runs a remote deploy"
  task :remote do
    Rake::Task["deploy:remote_before"].invoke
    system "ssh #{config(:user)}@#{config(:host)} 'cd #{config(:app)} && git pull && rake deploy:local RAILS_ENV=production'"
    Rake::Task["deploy:remote_after"].invoke
  end
  
end

task :deploy => "deploy:remote"