gistfile1

desc "Download a tarball from Github and extract to a shared dir then symlink to vendor/rails"
task :deploy_edge do
  puts "Pulling Rails from github"
  shared      = ENV['SHARED_PATH'] || File.join('..','..','shared')
  shared_path = File.expand_path(shared)
  puts "Shared Path: #{shared_path}"

  rails_path    = File.join(shared_path, 'rails')
  rails_version = ENV['VERSION'] || ENV['REVISION'] || 'v2.1.0'
  export_path   = File.join(rails_path, "rails_#{rails_version}")
  symlink_path  = File.join(RAILS_ROOT, 'vendor','rails')
  puts "Pulling Rails tag: #{rails_version} to #{export_path}"
  remote_revision_path = "http://github.com/rails/rails/tarball/#{rails_version}"
  local_tarball_path = File.join(rails_path, "rails_#{rails_version}.tar.gz")

  unless File.exists?(export_path)
    puts 'Downloading tar from github'
    mkdir_p export_path
    system "curl -L #{remote_revision_path} > #{local_tarball_path}"
    system "cd #{shared_path} && tar -xzf #{local_tarball_path}"
    system "cd #{shared_path} && mv rails-rails-*/* #{export_path}/"
  else
    puts '-> Rails already downloaded and extracted'
  end

  puts 'Symlinking to vendor/rails'
  rm_rf   symlink_path
  ln_s    export_path, symlink_path
  touch "vendor/rails_#{rails_version}"
  puts 'Done'
end