nixos/profiles/system.nix

   1 { config, pkgs, lib, inputs, ... }:
   2 with lib;
   3 {
   4   boot.tmp.cleanOnBoot = mkDefault true;
   5   boot.tmp.useTmpfs = mkDefault true;
   6   services.logrotate.enable = true;
   7   # NOTE: mostly useless on a server, and CPU intensive.
   8   documentation = {
   9     enable = mkDefault true;
  10     dev.enable = mkDefault false;
  11     doc.enable = mkDefault true;
  12     info.enable = mkDefault false;
  13     man.enable = mkDefault true;
  14     nixos.enable = mkDefault false;
  15   };
  16   programs.vim.defaultEditor = mkDefault true;
  17   environment.variables = {
  18     EDITOR = "vim";
  19     NIXPKGS_CONFIG = mkForce "";
  20     PAGER = "less -R";
  21     SYSTEMD_LESS = "FKMRX";
  22     # Setting TZ= avoids a lot of useless syscalls reading /etc/localtime
  23     # but requires to restart the session to change the time zone for all programs.
  24     TZ = config.time.timeZone;
  25   };
  26   home-manager.users.root = {
  27     imports = [
  28       ../../home-manager/options.nix
  29       ../../home-manager/profiles/essential.nix
  30     ];
  31     services.gpg-agent.pinentryFlavor = "curses";
  32   };
  33   systemd.services.home-manager-root.postStart = ''
  34     ${pkgs.nix}/bin/nix-env --delete-generations +1 --profile /nix/var/nix/profiles/per-user/root/home-manager
  35   '';
  36   nix = {
  37     settings.auto-optimise-store = mkDefault true;
  38     gc.automatic = mkDefault true;
  39     gc.dates = mkDefault "weekly";
  40     gc.options = mkDefault "--delete-older-than 7d";
  41     nixPath = mkForce [ ];
  42     registry.nixpkgs = mkDefault { flake = inputs.nixpkgs; };
  43     package = pkgs.nixFlakes;
  44     settings.experimental-features = [ "nix-command" "flakes" ];
  45   };
  46   security.lockKernelModules = false;
  47   services.journald = {
  48     extraConfig = ''
  49       Compress=true
  50       MaxRetentionSec=1month
  51       Storage=persistent
  52       SystemMaxUse=100M
  53     '';
  54   };
  55   systemd.oomd = {
  56     enable = mkDefault true;
  57     enableRootSlice = mkDefault true;
  58     enableSystemSlice = mkDefault true;
  59     enableUserServices = mkDefault true;
  60   };
  61   systemd.services.openssh = {
  62     serviceConfig = {
  63       ManagedOOMPreference = "omit";
  64     };
  65   };
  66   /*
  67     system.nixos.versionSuffix = ".${
  68     substring 0 8 (inputs.self.lastModifiedDate or inputs.self.lastModified)}.${
  69     inputs.self.shortRev or "dirty"}";
  70     system.nixos.revision = mkIf (inputs.self ? rev) inputs.self.rev;
  71   */
  72   # Let 'nixos-version --json' know about the Git revision of this flake.
  73   system.configurationRevision = mkIf (inputs.self ? rev) inputs.self.rev;
  74   /*
  75     system.configurationRevision =
  76     if inputs.self ? rev
  77     then inputs.self.rev
  78     else throw "Refusing to build from a dirty Git tree!";
  79   */
  80   users.mutableUsers = false;
  81 }