ytt

Template and patch as needed to easily make your configuration reusable and extensible. Works with your own and third-party YAML configuration. ytt templates are plain YAML documents made from nodes such as maps and arrays. ytt allows you to set values and attach statements (such as if and for loops) on those nodes. This eliminates text insertion concerns like manual escaping and allows for easy structure reuse, thus, increasing readability. Weave ytt templating into your own configuration, externalize values to variables, extract repeated snippets to functions, and make whole sections conditional. Patch on top of any configuration using ytt overlays. Express precise structural edits and invariant declaratively. ytt execution environment is hermetic and side-effect free, with no access to the filesystem, network, time, randomness, or the operating system interfaces. This guarantees that templates produce identical output with the same inputs.