class Bundler::Installer

def run(options)
  if actual_dependencies.empty?
    Bundler.ui.warn "The Gemfile specifies no dependencies"
    return
  end
  # Ensure that BUNDLE_PATH exists
  FileUtils.mkdir_p(Bundler.bundle_path)
  # Must install gems in the order that the resolver provides
  # as dependencies might actually affect the installation of
  # the gem.
  specs.each do |spec|
    spec.source.fetch(spec) if spec.source.respond_to?(:fetch)
    unless requested_specs.include?(spec)
      Bundler.ui.debug "  * Not in requested group; skipping."
      next
    end
    if [Source::Rubygems, Source::GemCache].include?(spec.source.class)
      Bundler.ui.info "Installing #{spec.name} (#{spec.version}) from #{spec.source}"
    else
      Bundler.ui.info "Using #{spec.name} (#{spec.version}) from #{spec.source}"
    end
    spec.source.install(spec)
  end
  if locked?
    write_rb_lock
  end
end