/usr/lib/ruby/ is in ruby-googleauth 0.5.1-2build1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/googleauth/
/usr/lib/ruby/vendor_ruby/googleauth/client_id.rb
/usr/lib/ruby/vendor_ruby/googleauth/compute_engine.rb
/usr/lib/ruby/vendor_ruby/googleauth/credentials_loader.rb
/usr/lib/ruby/vendor_ruby/googleauth/iam.rb
/usr/lib/ruby/vendor_ruby/googleauth/scope_util.rb
/usr/lib/ruby/vendor_ruby/googleauth/service_account.rb
/usr/lib/ruby/vendor_ruby/googleauth/signet.rb
/usr/lib/ruby/vendor_ruby/googleauth/stores/
/usr/lib/ruby/vendor_ruby/googleauth/stores/file_token_store.rb
/usr/lib/ruby/vendor_ruby/googleauth/stores/redis_token_store.rb
/usr/lib/ruby/vendor_ruby/googleauth/token_store.rb
/usr/lib/ruby/vendor_ruby/googleauth/user_authorizer.rb
/usr/lib/ruby/vendor_ruby/googleauth/user_refresh.rb
/usr/lib/ruby/vendor_ruby/googleauth/version.rb
/usr/lib/ruby/vendor_ruby/googleauth/web_user_authorizer.rb
/usr/lib/ruby/vendor_ruby/googleauth.rb