/usr/lib/ruby/vendor_ruby/ is in librarian-puppet 3.0.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/librarian/
/usr/lib/ruby/vendor_ruby/librarian/puppet/
/usr/lib/ruby/vendor_ruby/librarian/puppet/action/
/usr/lib/ruby/vendor_ruby/librarian/puppet/action/install.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/action/resolve.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/action.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/cli.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/dependency.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/dsl.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/environment.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/extension.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/lockfile.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/source/
/usr/lib/ruby/vendor_ruby/librarian/puppet/source/forge/
/usr/lib/ruby/vendor_ruby/librarian/puppet/source/forge/repo.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/source/forge/repo_v1.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/source/forge/repo_v3.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/source/forge.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/source/git.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/source/githubtarball/
/usr/lib/ruby/vendor_ruby/librarian/puppet/source/githubtarball/repo.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/source/githubtarball.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/source/local.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/source/path.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/source/repo.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/source.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/templates/
/usr/lib/ruby/vendor_ruby/librarian/puppet/templates/Puppetfile
/usr/lib/ruby/vendor_ruby/librarian/puppet/util.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet/version.rb
/usr/lib/ruby/vendor_ruby/librarian/puppet.rb