/usr/lib/ruby/vendor_ruby/cheffish/ is in ruby-cheffish 4.0.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/cheffish/array_property.rb
/usr/lib/ruby/vendor_ruby/cheffish/base_properties.rb
/usr/lib/ruby/vendor_ruby/cheffish/base_resource.rb
/usr/lib/ruby/vendor_ruby/cheffish/basic_chef_client.rb
/usr/lib/ruby/vendor_ruby/cheffish/chef_actor_base.rb
/usr/lib/ruby/vendor_ruby/cheffish/chef_run.rb
/usr/lib/ruby/vendor_ruby/cheffish/chef_run_data.rb
/usr/lib/ruby/vendor_ruby/cheffish/chef_run_listener.rb
/usr/lib/ruby/vendor_ruby/cheffish/key_formatter.rb
/usr/lib/ruby/vendor_ruby/cheffish/merged_config.rb
/usr/lib/ruby/vendor_ruby/cheffish/node_properties.rb
/usr/lib/ruby/vendor_ruby/cheffish/recipe_dsl.rb
/usr/lib/ruby/vendor_ruby/cheffish/rspec/
/usr/lib/ruby/vendor_ruby/cheffish/rspec.rb
/usr/lib/ruby/vendor_ruby/cheffish/rspec/chef_run_support.rb
/usr/lib/ruby/vendor_ruby/cheffish/rspec/matchers/
/usr/lib/ruby/vendor_ruby/cheffish/rspec/matchers.rb
/usr/lib/ruby/vendor_ruby/cheffish/rspec/matchers/be_idempotent.rb
/usr/lib/ruby/vendor_ruby/cheffish/rspec/matchers/emit_no_warnings_or_errors.rb
/usr/lib/ruby/vendor_ruby/cheffish/rspec/matchers/have_updated.rb
/usr/lib/ruby/vendor_ruby/cheffish/rspec/matchers/partially_match.rb
/usr/lib/ruby/vendor_ruby/cheffish/rspec/recipe_run_wrapper.rb
/usr/lib/ruby/vendor_ruby/cheffish/rspec/repository_support.rb
/usr/lib/ruby/vendor_ruby/cheffish/server_api.rb
/usr/lib/ruby/vendor_ruby/cheffish/version.rb
/usr/lib/ruby/vendor_ruby/cheffish/with_pattern.rb