# File lib/rubygems/remote_installer.rb, line 77
    def source_index_hash
      return @source_index_hash if @source_index_hash
      @source_index_hash = {}
      Gem::SourceInfoCache.cache_data.each do |source_uri, sic_entry|
        @source_index_hash[source_uri] = sic_entry.source_index
      end
      @source_index_hash
    end