dl-app.rb

#!/usr/bin/env ruby
require 'rubygems'
require 'bundler/setup'
require 'cfoundry'
require 'uuidtools'

# client = CFoundry::Client.new 'http://api.cloudfoundry.com'
# client.login ENV['cf_user'], ENV['cf_pass']

home = ENV['HOME']
endpoint = 'https://api.cloudfoundry.com'

config = YAML.load File.read("#{home}/.vmc/tokens.yml")
token = CFoundry::AuthToken.from_hash config[endpoint]

client = CFoundry::Client.new endpoint, token
client.proxy = ARGV[2] if ARGV[2] # proxy as another user?

def is_folder(f)
  return true if f.length == 1
  return true if f[1] =~ /\/$/
  false
end

app = client.app_by_name ARGV[0]
# start zip stream
zip_path = [app.name, '-', UUIDTools::UUID.random_create, '.zip'].join

folder_queue = app.files(ARGV[1] || '/')
retry_list = {}

Zip::ZipOutputStream.open(zip_path) do |zip|

  next_file = folder_queue.pop

  while next_file do
    puts next_file.join

    if is_folder(next_file)
      app.files(next_file.join).each { |f| folder_queue.insert 0, f }
    else
      path = next_file.join

      zip.put_next_entry([app.name, "/", path].join)
      begin
        zip.print app.file(path)
      rescue
        # file failed, come back for it later
        puts "Couldn't get #{next_file.join}, moving to the back of the queue!"
        retry_list[next_file.join] = 0 if retry_list[next_file.join].nil?
        retry_list[next_file.join] += 1
        folder_queue.insert 0, next_file if retry_list[next_file.join] < 5
      end
    end

    next_file = folder_queue.pop
  end

end

Gemfile

source :rubygems

gem 'cfoundry'
gem 'uuidtools'