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   };
  32   systemd.services.home-manager-root.postStart = ''
  33     ${pkgs.nix}/bin/nix-env --delete-generations +1 --profile /nix/var/nix/profiles/per-user/root/home-manager
  34   '';
  35   nix = {
  36     settings.auto-optimise-store = mkDefault true;
  37     gc.automatic = mkDefault true;
  38     gc.dates = mkDefault "weekly";
  39     gc.options = mkDefault "--delete-older-than 7d";
  40     nixPath = mkForce [ ];
  41     registry.nixpkgs = mkDefault { flake = inputs.nixpkgs; };
  42     package = pkgs.nixFlakes;
  43     settings.experimental-features = [ "nix-command" "flakes" ];
  44   };
  45   security.lockKernelModules = false;
  46   services.journald = {
  47     extraConfig = ''
  48       Compress=true
  49       MaxRetentionSec=1month
  50       Storage=persistent
  51       SystemMaxUse=100M
  52     '';
  53   };
  54   systemd.oomd = {
  55     enable = mkDefault true;
  56     enableRootSlice = mkDefault true;
  57     enableSystemSlice = mkDefault true;
  58     enableUserServices = mkDefault true;
  59   };
  60   systemd.services.openssh = {
  61     serviceConfig = {
  62       ManagedOOMPreference = "omit";
  63     };
  64   };
  65   /*
  66     system.nixos.versionSuffix = ".${
  67     substring 0 8 (inputs.self.lastModifiedDate or inputs.self.lastModified)}.${
  68     inputs.self.shortRev or "dirty"}";
  69     system.nixos.revision = mkIf (inputs.self ? rev) inputs.self.rev;
  70   */
  71   # Let 'nixos-version --json' know about the Git revision of this flake.
  72   system.configurationRevision = mkIf (inputs.self ? rev) inputs.self.rev;
  73   /*
  74     system.configurationRevision =
  75     if inputs.self ? rev
  76     then inputs.self.rev
  77     else throw "Refusing to build from a dirty Git tree!";
  78   */
  79   users.mutableUsers = false;
  80 }