/usr/lib/ruby/vendor_ruby/rails/generators/rails/generator/templates/%file_name%_generator.rb.tt 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 | class <%= class_name %>Generator < Rails::Generators::NamedBase
source_root File.expand_path('../templates', __FILE__)
end
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