An Example Orca File

orca.rb

require "rest-client"
require "orca/extensions/apt"
require "orca/extensions/file_sync"

group 'server' do
  node 'kent-web-1', 'xxx.xxx.xxx.xxx', :test_url => 'http://mysite.com/'
end

package 'app' do
  depends_on 'deploy-user'
  depends_on 'dev'
  depends_on 'ruby-1.9.3'
  depends_on 'nginx-passenger'
  depends_on 'bundler'
  depends_on 'postgres'
  depends_on 'libxml2'
  depends_on 'libxslt'
  depends_on 'nodejs'

  apply do
    trigger 'nginx:restart'
  end

  validate do
    RestClient.get(node.test_url).code == 200 rescue false
  end
end

apt_package 'build-essential'
apt_package 'git', 'git-core'
apt_package 'postgresql'
apt_package 'libpq-dev'
apt_package 'libxml2', 'libxml2-dev'
apt_package 'libxslt', 'libxslt1-dev'
apt_package 'nginx' do
  action('start')   { sudo 'service nginx start' }
  action('stop')    { sudo 'service nginx stop' }
  action('restart') { trigger('nginx:running') ? sudo('service nginx restart') : trigger('nginx:start') }
  action('running') { run('ps aux | grep [n]ginx') =~ /nginx: master process/ }
  action('reload')  { sudo 'pkill -HUP nginx' }
end

package 'dev' do
  depends_on 'build-essential'
  depends_on 'git'
end

package 'postgres' do
  depends_on 'postgresql', 'libpq-dev'
end

package 'nginx-passenger' do
  depends_on 'gem', 'nginx', 'passenger-common'
  validate do
    trigger('gem:exists', 'passenger') &&
    remote("/etc/nginx/sites-enabled/default").exists? == false
  end
  apply do
    trigger 'gem:install', 'passenger'
    remote("/etc/nginx/sites-enabled/default").delete!
  end
  remove do
    trigger 'gem:uninstall', 'passenger'
  end

  file({
    :source       => 'files/nginx.conf',
    :destination  => '/etc/nginx/nginx.conf',
    :permissions  => 0644,
    :user         => 'root',
    :group        => 'root'
  }) { trigger 'nginx:restart' }
end

apt_package 'passenger-common', 'passenger-common1.9.1' do
  depends_on 'ruby-1.9.3'
end

package 'ruby-1.9.3' do
  depends_on 'apt'
  validate do
    trigger('apt:exists', 'ruby1.9.3') && binary_exists?('ruby')
  end
  apply do
    trigger 'apt:ppa', 'ppa:brightbox/ruby-ng'
    trigger 'apt:update'
    trigger 'apt:install', 'ruby1.9.3'
  end
end

package 'nodejs' do
  depends_on 'apt'
  validate do
    trigger('apt:exists', 'nodejs') &&
    binary_exists?('node') &&
    binary_exists?('npm')
  end
  apply do
    trigger 'apt:ppa', 'ppa:chris-lea/node.js'
    trigger 'apt:update'
    trigger 'apt:install', 'nodejs'
  end
  remove do
    trigger 'apt:remove', 'nodejs'
  end
end

package 'gem' do
  depends_on 'ruby-1.9.3'
  action 'exists' do |gem_name|
    run("gem list -i #{gem_name}") =~ /true/
  end
  action 'install' do |gem_name|
    sudo "gem install #{gem_name} --no-ri --no-rdoc"
  end
  action 'uninstall' do |gem_name|
    sudo "gem uninstall #{gem_name} -x -a"
  end
end

package 'bundler' do
  depends_on 'gem'
  apply    { trigger 'gem:install', 'bundler' }
  remove   { trigger 'gem:remove', 'bundler' }
  validate { trigger 'gem:exists', 'bundler' }
end

package 'deploy-user' do
  apply do
    sudo "useradd -d /home/deploy -G sudo -m -U deploy"
    sudo "echo 'deploy ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers"
  end
  remove do
    sudo "userdel -f deploy"
    sudo "rm -rf /home/deploy"
  end
  validate do
    sudo('getent passwd deploy') =~ /^deploy:/ &&
    sudo('groups deploy') =~ /deploy sudo/
  end


  file({
    :source       => 'files/ssh.keys',
    :destination  => '/home/deploy/.ssh/authorized_keys',
    :create_dirs  => true,
    :permissions  => 0644,
    :user         => 'deploy',
    :group        => 'deploy'
  })
end