/usr/lib/ruby/vendor_ruby/rails/generators/rails/plugin/templates/rails/boot.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 | # Set up gems listed in the Gemfile.
ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../../../Gemfile', __FILE__)
require 'bundler/setup' if File.exist?(ENV['BUNDLE_GEMFILE'])
$LOAD_PATH.unshift File.expand_path('../../../../lib', __FILE__)
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