versatus.nix

A Nix flake for the Versatus Labs ecosystem which provides reproducible build guarantees for Versatus binaries, development environments for building Versatus repositories on supported systems and NixOS images & infrastructure for deploying Versatus services.

This flake is the core infrastructure for Versatus repositories. It contains a lib attribute with functions for crafting toolchains, modules and virtualisation tools for creating NixOS configurations and local virtual environments, templates, with robust tooling, for managing projects, and more.

Prerequisites

Nix is a package manager with a focus on reproducibility and reliability. To get started, choose an installation type at https://nixos.org/download. MacOS users, please read on.

For MacOS users, the graphical installer made available by Determinate Systems has some advantages and is recommended over the official installer, which are explained and can be found here: https://determinate.systems/posts/graphical-nix-installer.

Additionally, MacOS users may want to enable the nix-darwin module features in order to run linux virtual machines locally, otherwise this step may be skipped. The deployment guide has a detailed walkthrough with examples and trouble shooting for getting started with the nix-darwin linux-builder feature.

Nixpkgs

For the Nix package manager on non-NixOS distributions, add the following to /etc/nix/nix.conf:

Note: If you used the Determinate Systems Nix installer, these settings are enabled by default.

experimental-features = nix-command flakes

NixOS

For the Nix operating system, add the following to /etc/nixos/configuration.nix:

nix.settings.experimental-features = [ "nix-command" "flakes" ];

Developer Quick Start

First, ensure your system is listed under Supported Systems.

Then enter a temporary development shell with nix develop:

nix develop

Supported Systems

• x86_64-linux
• x86_64-darwin
• aarch64-linux
• aarch64-darwin

Note: The Determinate Systems Nix installer also supports WSL.

Available Toolchain Functions

• mkRustToolchainFromTOML: Given the path to a rust-toolchain.toml, produces the derivation for that toolchain for linux and darwin systems. Useful for rust projects that declare a rust-toolchain.toml.
• mkHaskellToolchain: Takes nixpkgs as input, provides common haskell tools and automatically resolves paths. Includes LD_LIBRARY_PATH environment variable.

Note: The following functions will be created as time allows. If a toolchain you would like to see isn't present please feel free to file an issue and follow it up with a Pull Request.

• mkJsToolchain
• mkGoToolchain
• mkPythonToolchain
• mkClangToolchain
• mkCppToolchain