Runtime templates

This repository contains runtime templates to build functions packages (a.k.a rootfs).

What are function packages ?

Function packages, also called rootfs, are ready-to-use FS to start Firecracker microVM. The package includes all the following items :

• The function code
• The function wrapper
• All the function dependencies
• The underlying runtime to run the function (Node, Python, Go ...)

To build a function package, you should use the morty CLI. Please refer to the morty's README for more details about how function packages are built.

How to develop a template

At the moment, we support only languages that provide HTTP server through their standard library or external dependencies.

To create a new template runtime, you must follow the following steps :

• Create a folder into the template directory, for example : template/node-19
• Create the wrapper script with the embedded HTTP server. The wrapper HTTP server must expose import the function, and map it to all the routes / methods. See the example of node-19.
• Create a Dockerfile and a .dockerignore file. Check existing examples for how to structure these files.