class Bundler::Fetcher

def download_gem_from_uri(spec, uri)
  spec.fetch_platform
  download_path = Bundler.requires_sudo? ? Bundler.tmp(spec.full_name) : Bundler.rubygems.gem_dir
  gem_path = "#{Bundler.rubygems.gem_dir}/cache/#{spec.full_name}.gem"
  FileUtils.mkdir_p("#{download_path}/cache")
  Bundler.rubygems.download_gem(spec, uri, download_path)
  if Bundler.requires_sudo?
    Bundler.mkdir_p "#{Bundler.rubygems.gem_dir}/cache"
    Bundler.sudo "mv #{Bundler.tmp(spec.full_name)}/cache/#{spec.full_name}.gem #{gem_path}"
  end
  gem_path
end