Rework common profile into module system

2020-12-05 13:39:22 +01:00 · 2020-12-05 13:39:22 +01:00 · 9fdec35027
commit 9fdec35027
parent 9d2e54547c
29 changed files with 288 additions and 214 deletions
--- a/modules/nix.nix
+++ b/modules/nix.nix
@ -0,0 +1,105 @@
+{ config, lib, pkgs, ... }:
+let
+  baseDirenv = {
+    programs.direnv = {
+      enable = true;
+      enableZshIntegration = true;
+      enableNixDirenvIntegration = true;
+    };
+  };
+  baseUnfree = {
+    xdg.configFile."nixpkgs/config.nix".source = ./nix/unfree.nix;
+  };
+  baseNixIndex = {
+    home.packages = with pkgs; [ nix-index ];
+    programs.zsh.initExtra = ''
+      source ${pkgs.nix-index}/etc/profile.d/command-not-found.sh
+    '';
+    systemd.user = {
+      services.nix-index = {
+        Unit = {
+          Description = "Service to run nix-index";
+        };
+        Service = {
+          Type = "oneshot";
+          ExecStart = "${pkgs.nix-index}/bin/nix-index";
+        };
+      };
+      timers.nix-index = {
+        Unit = {
+          Description = "Timer that starts nix-index every two hours";
+          PartOf = [ "nix-index.service" ];
+        };
+        Timer = {
+          OnCalendar = "00/2:30";
+        };
+        Install = {
+          WantedBy = [ "default.target" ];
+        };
+      };
+    };
+  };
+in
+{
+  options.chvp.nix = {
+    enableDirenv = lib.mkOption {
+      default = true;
+      example = false;
+    };
+    enableFlakes = lib.mkOption {
+      default = true;
+      example = false;
+    };
+    enableUnfree = lib.mkOption {
+      default = false;
+      example = true;
+    };
+    # Note that this is only enabled for charlotte, until https://github.com/bennofs/nix-index/issues/143 is resolved.
+    enableNixIndex = lib.mkOption {
+      default = true;
+      example = false;
+    };
+  };
+
+  config = {
+    chvp.zfs.homeLinks =
+      (lib.optional config.chvp.nix.enableDirenv { path = ".local/share/direnv"; type = "cache"; }) ++
+      (lib.optional config.chvp.nix.enableNixIndex { path = ".cache/nix-index"; type = "cache"; });
+    chvp.zfs.systemLinks =
+      (lib.optional config.chvp.nix.enableDirenv { path = "/root/.local/share/direnv"; type = "cache"; });
+
+    nix = {
+      gc = {
+        automatic = true;
+        dates = "hourly";
+        options = "--delete-older-than 7d";
+      };
+      optimise = {
+        automatic = true;
+        dates = [ "hourly" ];
+      };
+      trustedUsers = [ "@wheel" ];
+      extraOptions = (lib.optionalString config.chvp.nix.enableDirenv ''
+        keep-outputs = true
+        keep-derivations = true
+      '') + (lib.optionalString config.chvp.nix.enableFlakes ''
+        experimental-features = nix-command flakes
+      '');
+    };
+
+    nixpkgs.config = lib.mkIf config.chvp.nix.enableUnfree (import ./nix/unfree.nix);
+    nixpkgs.overlays = lib.mkIf config.chvp.nix.enableFlakes [
+      (self: super: {
+        nix = super.nixUnstable;
+      })
+    ];
+
+    home-manager.users.charlotte = { ... }:
+      (lib.optionalAttrs config.chvp.nix.enableDirenv baseDirenv) //
+      (lib.optionalAttrs config.chvp.nix.enableUnfree baseUnfree) //
+      (lib.optionalAttrs config.chvp.nix.enableNixIndex baseNixIndex);
+    home-manager.users.root = { ... }:
+      (lib.optionalAttrs config.chvp.nix.enableDirenv baseDirenv) //
+      (lib.optionalAttrs config.chvp.nix.enableUnfree baseUnfree);
+  };
+}