# File lib/rubygems/commands/fetch_command.rb, line 34
  def execute
    version = options[:version] || Gem::Requirement.default
    all = Gem::Requirement.default

    gem_names = get_all_gem_names

    gem_names.each do |gem_name|
      dep = Gem::Dependency.new gem_name, version

      specs_and_sources = Gem::SpecFetcher.fetcher.fetch dep, all

      specs_and_sources.sort_by { |spec,| spec.version }

      spec, source_uri = specs_and_sources.last

      if spec.nil? then
        alert_error "Could not find #{gem_name} in any repository"
        next
      end

      path = Gem::RemoteFetcher.fetcher.download spec, source_uri
      FileUtils.mv path, "#{spec.full_name}.gem"

      say "Downloaded #{spec.full_name}"
    end
  end