Deploy a Play framework app with SSHKit

deploy.rb

require 'sshkit'
require 'sshkit/dsl'

# Once "bundle install" has been run, this script can be run as "ruby deploy.rb staging" or "ruby deploy.rb prod"

if ARGV.first == "prod"
  servers = ['deploy@prod1.example.com', 'deploy@prod2.example.com']
elsif ARGV.first == "staging"
  servers = ['deploy@staging.example.com']
else
  puts "Unknown env. Exiting."
  exit
end

on [:local] do |host| #TODO: Make this step optional?
  puts "Building on local..."
  puts "Cleaning..."
  execute("activator clean")
  puts "Building dist..."
  execute("activator dist")
  puts "Done"
end

on servers, in: :sequence, wait: 1 do |host|
  puts "\n\nNow running on #{host}..."
  deploy_dir = "/home/deploy/" + Time.now.strftime('%Y%m%d%H%M')
  puts "Making #{deploy_dir} directory..."
  puts execute(:mkdir, '-p', deploy_dir)
  puts "Uploading zip..."
  upload! 'app.zip', deploy_dir
  hh = host.split("@").last.split(".").first
  within deploy_dir do
    execute("unzip app.zip")
    execute("cp application.conf.#{hh} application.conf")
    execute("killall java") #stop existing process
    execute("nohup bin/app &") #start the server
  end
  puts "Done on #{host}"
end

on [:local] do |host|
  puts "\n\nRunning tests..."
  # Run some tests to check whether deploy went okay
  servers.each do |host|
    domain = host.split("@").last
    if test "curl http://#{domain}/"
      puts "#{domain} seems to be up"
    else
      puts "#{domain} seems to be down !!!"
    end
  end
end