Git

Git is the most commonly used version control system for software development.

Declarative configuration

Git can be declaratively configured in Nix via home-manager. Here is an example:

{
  programs.git = {
    enable = true;
    userName = "john";
    userEmail = "[email protected]";
    ignores = [ "*~" "*.swp" ];
    extraConfig = {
      init.defaultBranch = "master";
    };
  };
}

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Use a local directory as flake input

A Flake URL can not only be Git repositories. They can also refer to local paths. If you have two projects ~/code/foo and ~/code/bar, and bar depends on foo, you can use the following flake.nix in bar to have it refer to the local foo project:
Install NixOS with Flake configuration on Git

First we need to install Git:

Let’s store our whole configuration in a Git repository.

This tutorial will walk you through the steps necessary to install NixOS, enable flakes while tracking the resulting system configuration in a Git repository.
Convert configuration.nix to be a flake

Progress, but we hit another error—Nix understandably cannot write to root-owned directory (it tries to create the flake.lock file). One way to resolve this is to move the whole configuration to our home directory, which would also prepare the ground for storing it in Git. We will do this in the next section.