fetch_remote_gems

# File lib/rubygems/commands/update_command.rb, line 111
  def fetch_remote_gems spec # :nodoc:
    dependency = Gem::Dependency.new spec.name, "> #{spec.version}"
    dependency.prerelease = options[:prerelease]

    fetcher = Gem::SpecFetcher.fetcher

    spec_tuples, errors = fetcher.search_for_dependency dependency

    error = errors.find { |e| e.respond_to? :exception }

    raise error if error

    spec_tuples
  end