Cap script for deploying gems to a static gem server, see http://thoughtsincomputation.com/posts/hosting-gems-with-apache-and-capistrano

deploy.rb

set :deploy_to,     "public_html"             # the remote path where the gem index lives
set :build_command, "bundle exec rake build"  # the command to build the gem locally
set :user,          "rubygems"                # the user to log in to the server with

# the rubygems server to deploy to
server "gems.example.com", :app

desc "Deploy the gem and rebuild the index"
task :deploy do
  build
  upload_gem
  generate_index
end

desc "Build the gem locally"
task :build do
  result = %x[#{build_command}]
  exit 1 unless $?.success?

  unless result =~ /built to (.*?)\e|$/
    puts "Could not match filename from output"
    puts result
    exit 2
  end
  
  set :filename, $1.strip
end

desc "Upload the gem to the rubygems server"
task :upload_gem do
  put File.read(filename), File.join(deploy_to, "gems", File.basename(filename))
end

desc "Rebuild the gem index on the rubygems server"
task :generate_index do
  run "cd #{deploy_to} && gem generate_index -d ."
end