class Bundler::LockfileGenerator

def add_sources
  definition.send(:sources).lock_sources.each_with_index do |source, idx|
    out << "\n" unless idx.zero?
    # Add the source header
    out << source.to_lock
    # Find all specs for this source
    specs = definition.resolve.select {|s| source.can_lock?(s) }
    add_specs(specs)
  end
end