#+title: nix flakes

Nix flakes are a type of package for [[file:20200629134051-nixos.org][NixOS]]. They are "self-contained units that
have inputs (dependencies) and outputs (packages)." They are written in the [[file:20200629133954-nix_programming_language.org][Nix]]
language.

* Structure
A flake is a directory that simply contains a =flake.nix= file. Nix flakes are
somewhat simple: they are Nix objects with an input and an output.

#+begin_src nix :eval never
{
  outputs = { self }: {
    # some arbitrary output
    # `nix eval .#foo` would output "bar"
    foo = "bar";
  };
}
#+end_src

#+RESULTS:

* References
- [[https://serokell.io/blog/practical-nix-flakes][Practical Nix Flakes]]
- [[https://www.tweag.io/blog/2020-05-25-flakes/][Nix Flakes, Part 1: An introduction and tutorial - Tweag]]
- [[https://www.tweag.io/blog/2020-06-25-eval-cache/][Nix Flakes, Part 2: Evaluation caching - Tweag]]
- [[https://www.tweag.io/blog/2020-07-31-nixos-flakes/][Nix Flakes, Part 3: Managing NixOS systems - Tweag]]