Engineyard deployment rake task for multiple SaS CI solutions. I have used this successfully for Tddium and CircleCI.

deploy.rake

# Setup:
# add environment variables onto CI
# EY_API_TOKEN xxxxxxxx (take EY_API_TOKEN value from ~/.eyrc)
# CI true (checks to see if we are on the CI machine)
# Get the Deploy key from CI system or set on CI system
#   Tddium run: 'tddium account' to get public key to put on engine yard
#   CircleCI: generate a private/public key set then add via their web interface the ssh keys
# Tddium will automatically run rake tddium:post_build_hook
# Using circle.yml to call rake ci:deploy

require 'timeout'
require 'etc'
require 'base64'

ENV['CI_DEPLOYMENT_ENV'] = 'development'
ENV['CI_DEPLOYMENT_BRANCH'] = 'master'

def current_branch
  `git symbolic-ref HEAD 2>/dev/null | cut -d"/" -f 3-`.strip
end

def ci?
  tddium? || ENV['CI'].present?
end

def tddium?
  ENV['TDDIUM'].present?
end

namespace :tddium do
  task :post_build_hook do
    Rake::Task["ci:deploy"].execute
  end
end

namespace :ci do
  desc "Run deploy script"
  task :deploy do
    print_status_info
    if deploy?
      Rake::Task["deploy:dev"].execute
    end
  end

  private

  def print_status_info
    puts "ci? " + ci?.inspect
    puts "passed? " + passed?.inspect
    puts "on_tracked_branch? " + on_tracked_branch?.inspect
    puts "deploy? " + deploy?.inspect
  end

  def deploy?
    ci? && on_tracked_branch? && passed?
  end

  def passed?
    ENV['TDDIUM_BUILD_STATUS'].present? ? ENV['TDDIUM_BUILD_STATUS'] == 'passed' : true
  end

  def on_tracked_branch?
    current_branch == tracked_branch
  end

  def tracked_branch
    ENV['CI_DEPLOYMENT_BRANCH']
  end
end

namespace :deploy do
  desc "Deploy master branch to dev server"
  task :dev do
    deploy_with_timeout
  end

  private

  def deploy_with_timeout
    Timeout::timeout(600) do
      deploy
    end
  end

  def ey_deploy_cmd
    "ey deploy -m -e #{ENV['CI_DEPLOYMENT_ENV']} -r #{current_branch}"
  end

  def write_eyrc
    puts "Writing .eyrc key"
    content = "---\napi_token: #{ENV['EY_API_TOKEN']}"
    File.open("#{home_dir}/.eyrc", "wb+") do |f|
      f.write(content)
      f.chmod(0600)
    end
  end

  def home_dir
    Etc.getpwuid.dir
  end

  def deploy
    write_eyrc
    system ey_deploy_cmd
  end
end