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Hosts
Module declarations dependant on particular machines should be stored in the
hosts directory. Every file in this directory will be added automatically
to the the nixosConfigurations flake output and thus becomes deployable via
nixos-rebuild and rebuild.
See hosts/default.nix for the implementation.
Profiles
A profile is any directory under profiles containing a default.nix
defining a valid NixOS module, with the added restriction that no new
delclarations to the options or config attributes are allowed
(use modules instead). Their purpose is to provide abstract
expressions suitable for reuse by multiple deployments. They are perhaps the
key mechanism by which we keep this repo maintainable.
Profiles can have subprofiles which are themselves just profiles that live under
another. There's no hard rule that everything in the folder must be imported by
its default.nix, so you can also store relevant code that is useful but not
wanted by default in, say, an alt.nix. Importantly, every subdirectory in a
profile should be independent of its parent. i.e:
{
# importing `profile` without implicitly importing `some`
imports = [ ./profiles/some/profile ];
}
It is okay for profiles to depend on other profiles so long as they are
explicitly loaded via imports.
Optionally, you may choose to export your profiles via the flake output. If
you include it in the list defined in profiles/list.nix,
it will be available to other flakes via nixosModules.profiles.
Users
User declarations belong in the users directory.
These are actually just a special case of profiles attached to
a particular interactive user. Its primarily for declarations to
users.users.<new-user> where <new-user>.isNormalUser is true.
This is a convenient place to import your profiles such that a particular user always has a reliable stack.
For convenience, home-manager is available automatically for home directory setup and should only be used from this directory.
Lib
The lib directory contains a file utils.nix which is an attribute set
meant to consist mainly of utility functions you might want to write and use
throughout the configuration. They are available via a new usr attribute
passed to every NixOS module, eg:
# hosts/some-host.nix
{ usr, ... }:
let
inherit (usr) utils;
data = usr.utils.myFunction # ...
in
{
# NixOS configuration
}
Secrets
Anything you wish to keep encrypted goes in the secrets directory, which is
created on first entering a nix-shell.
Be sure to run git crypt init, before committing anything to this directory.
Be sure to check out git-crypt's documentation
if your not familiar. The filter is already set up to encrypt everything in this
folder by default.
To keep profiles reusable across configurations, secrets should
only be imported from the users or hosts directory.
Modules, Packages and Overlays
All expressions in both modules/list.nix and
pkgs/default.nix are available globally, anywhere else in the
repo. They are additionally included in the nixosModules and overlay flake
outputs, respectively. Packages can manually be added to flake.nix
for inclusion in the packages output as well.
The directory structure is identical to nixpkgs to provide a kind of staging area
for any modules or packages we might be wanting to merge there later. If your not
familiar or can't be bothered, simply dropping a valid nix file and pointing the
default.nix to it, is all that's really required.
As for overlays, they should be defined in the overlays directory.
They will be automatically pulled in for use by all configurations. Nix command
line tools will be able to read overlays from here as well since it is set as
nixpkgs-overlays in NIX_PATH. And of course they will be exported via the
flake output overlays as well.