Nix powered lambda

Uses several hacks to get Nix working in AWS Lambda.

The story

• containers
• chroot
• fakeroot
• udocker
• LD_PRELOAD
• namespaces
• nix rewriting
• nix patching
• early kill of builder
• nix configuration
• nix bundling
• ptmx,pty horror

Usage

TL;DR

make bundle
make update
make invoke

What is happening?

1. Produce the Package. This involves a patched Nix (NixOS/nix#2176) and including several additional libraries like certs, fakechroot. Then rewrite all the paths (https://github.com/timjrd/nixrewrite).
2. Upload to AWS. Must have a .arn containing the arn for a role with permissions for your lambda funcion.
3. Create a serialized description of the inputs and steps to take, out.nar.
4. Invoke the Lambda with the NAR, and obtain a build.
5. Add additional commands to move the build to a cache (like nix copy, it works with s3).
6. ???
7. Profit