Rake task to deploy Rails project to Heroku

deploy.rake

# -*- encoding : utf-8 -*-
namespace :heroku do
  namespace :deploy do
    PRODUCTION_APP = 'nomedoprojeto-production'
    STAGING_APP = 'nomedoprojeto-staging'

    def run(*cmd)
      system(*cmd)
      raise "Command #{cmd.inspect} failed!" unless $?.success?
    end

    def confirm(message)
      print "\n#{message}\nAre you sure? [yN] "
      raise 'Ok. Bye...' unless STDIN.gets.chomp.downcase == 'y'
    end

    desc "Deploy to staging"
    task :staging do
      # This constant is defined to avoid problemd of copying and pasting from one environment to another
      APP = STAGING_APP

      if ENV['SKIP_BACKUP'] != "true"
        puts "-----> Backing up database via Heroku…"
        run "heroku pgbackups:capture --expire --app #{APP}"
      end

      puts "-----> Pushing…"
      run "git push git@heroku.com:#{APP}.git HEAD:master -f"

      puts "-----> Migrating…"
      run "heroku run rake db:migrate --app #{APP}"

      puts "-----> Seeding…"
      run "heroku run rake db:seed --app #{APP}"

      puts "-----> Restarting…"
      run "heroku restart --app #{APP}"
    end

    desc "Deploy to production"
    task :production do
      # This constant is defined to avoid problemd of copying and pasting from one environment to another
      APP = PRODUCTION_APP

      confirm("Going deploy to production.")

      if ENV['SKIP_TESTS'] != "true"
        puts "-----> Running all specs…"
        Rake::Task['spec'].invoke
      end

      print "\nPut in maintenance mode? [Yn] "
      maintenance = (ENV['MAINTENANCE'] == "true" or (STDIN.gets.chomp.downcase == 'y'))

      if maintenance
        puts "-----> Setting Maintenance on…"
        run "heroku maintenance:on --app #{APP}"

        puts "-----> Restarting…"
        run "heroku restart --app #{APP}"

        puts "-----> Waiting 20 seconds to app come back (in maintenance mode)…"
        sleep(20)
      end

      if ENV['SKIP_BACKUP'] != "true"
        puts "-----> Backing up database via Heroku…"
        run "heroku pgbackups:capture --expire --app #{APP}"
      end

      iso_date = Time.now.strftime('%Y-%m-%dT%H%M%S')
      tag_name = "production-#{iso_date}"
      puts "-----> Tagging as #{tag_name}…"
      run "git tag #{tag_name} master"

      puts "-----> Pushing…"
      run "git push origin #{tag_name}"
      run "git push git@heroku.com:#{APP}.git #{tag_name}:master"

      puts "-----> Migrating…"
      run "heroku run rake db:migrate --app #{APP}"

      puts "-----> Seeding…"
      run "heroku run rake db:seed --app #{APP}"

      if maintenance
        puts "Setting Maintenance off…"
        run "heroku maintenance:off --app #{APP}"
      end

      puts "-----> Restarting…"
      run "heroku restart --app #{APP}"
    end
  end
end