class Bundler::GemSource

def fetch_specs
  Bundler.logger.info "Updating source: #{to_s}"
  fetcher = Gem::RemoteFetcher.fetcher
  main_index = fetcher.fetch_path("#{uri}/specs.4.8.gz")
  begin
    prerelease_index = fetcher.fetch_path("#{uri}/prerelease_specs.4.8.gz")
    index = Marshal.load(main_index) + Marshal.load(prerelease_index)
  rescue Gem::RemoteFetcher::FetchError
    Bundler.logger.warn "Source '#{uri}' does not support prerelease gems"
    index = Marshal.load(main_index)
  end
  gems = Hash.new { |h,k| h[k] = [] }
  index.each do |name, version, platform|
    spec = RemoteSpecification.new(name, version, platform, @uri)
    spec.source = self
    gems[spec.name] << spec if Gem::Platform.match(spec.platform)
  end
  gems
rescue Gem::RemoteFetcher::FetchError => e
  raise ArgumentError, "#{to_s} is not a valid source: #{e.message}"
end