/usr/lib/ruby/vendor_ruby/rails/generators/rails/plugin/templates/rails/application.rb is in ruby-railties 2:4.2.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | require File.expand_path('../boot', __FILE__)
<% if include_all_railties? -%>
require 'rails/all'
<% else -%>
# Pick the frameworks you want:
<%= comment_if :skip_active_record %>require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
require "action_view/railtie"
<%= comment_if :skip_sprockets %>require "sprockets/railtie"
<%= comment_if :skip_test_unit %>require "rails/test_unit/railtie"
<% end -%>
Bundler.require(*Rails.groups)
require "<%= name %>"
<%= application_definition %>
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