#+title: Misc NixOS Configurations
#+setupfile: headers

* Misc NixOS Configurations

This module hosts some misc configuration I am unsure where to put
elsewhere than here. Don’t expect this file to be coherent, but expect
it to be quite short.

This module declares the aspect =nixos.misc=, which is used by all my
hosts.

#+begin_src nix :tangle yes
{
  flake.modules.nixos.misc = {
    lib,
    config,
    ...
  }:
    with lib; let
      cfg = config.mySystem.misc;
    in {
      <<timezone-option>>
      <<layout-option>>

      config = {
        <<layout-config>>
        <<timezone-config>>
        <<envfs>>
        <<orca>>
        <<clean-tmp>>
        <<completion>>
      };
    };
}
#+end_src

** System Timezone
First, let me declare the timezone. I’ll set it as an option, as not
all my machines live in the same place, but I’ll default to
Metropolitan France’s timezone.
#+name: timezone-option
#+begin_src nix
options.mySystem.misc.timezone = mkOption {
  type = types.str;
  default = "Europe/Paris";
};
#+end_src

Now, I can set it for my system.
#+name: timezone-config
#+begin_src nix
time.timeZone = cfg.timezone;
#+end_src

** TTY Keyboard Layout
Now, I can set the TTY’s keyboard config. Most of my machines use the
Bépo layout everywhere, but I do share one whose owner doesn’t use it,
so I’ll let this as an option to be set, defaulting to the default
French layout.
#+name: layout-option
#+begin_src nix
options.mySystem.misc.keymap = mkOption {
  type = types.str;
  default = "fr";
  example = "fr-bepo";
  description = "Keymap to use in the TTY console";
};
#+end_src

Now, I can set it on my system.
#+name: layout-config
#+begin_src nix
console.keyMap = cfg.keymap;
#+end_src

** Truly Miscelaneous Config
First, some scripts are written with the assumption that some
utilities are always in the same place, such as =/bin/bash=. It is,
however, not always the case with NixOS. Mic92’s [[https://github.com/Mic92/envfs][envfs]] solves that.
#+name: envfs
#+begin_src nix
services.envfs.enable = true;
#+end_src

I have no idea why, but sometimes, [[https://orca.gnome.org/][Orca]] get activated without my
consent. So I hard-disable it here.
#+name: orca
#+begin_src nix
services.orca.enable = false;
#+end_src

I was surprised to see =/tmp= still hold the same files after my first
reboot in NixOS, I always assumed it was cleared on every reboot on
every system. But I can enable this behaviour back.
#+name: clean-tmp
#+begin_src nix
boot.tmp.cleanOnBoot = true;
#+end_src

Lastly, I want to make sure my shell completions work, so I’ll enable
this.
#+name: completion
#+begin_src nix
environment.pathsToLink = [
  "/share/bash-completion"
  "/share/zsh"
];
#+end_src