skrott: cross compile and further minimize

flake.lock

@@ -2,17 +2,16 @@
   "nodes": {
     "dibbler": {
       "inputs": {
-        "flake-utils": "flake-utils",
         "nixpkgs": [
           "nixpkgs"
         ]
       },
       "locked": {
-        "lastModified": 1769362210,
-        "narHash": "sha256-QCQD7Ofin5UYL0i5Sv34gfJ0p5pv1hwZspE/Ufe84L8=",
+        "lastModified": 1769400154,
+        "narHash": "sha256-K0OeXzFCUZTkCBxUDr3U3ah0odS/urtNVG09WDl+HAA=",
         "ref": "main",
-        "rev": "1d01e1b2cb8fb2adee96c0b4f065c43c45eae290",
-        "revCount": 229,
+        "rev": "8e84669d9bf963d5e46bac37fe9b0aa8e8be2d01",
+        "revCount": 230,
         "type": "git",
         "url": "https://git.pvv.ntnu.no/Projects/dibbler.git"
       },
@@ -61,23 +60,6 @@
         "type": "github"
       }
     },
-    "flake-utils": {
-      "inputs": {
-        "systems": "systems"
-      },
-      "locked": {
-        "lastModified": 1731533236,
-        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
-        "type": "github"
-      },
-      "original": {
-        "id": "flake-utils",
-        "type": "indirect"
-      }
-    },
     "gergle": {
       "inputs": {
         "nixpkgs": [
@@ -479,21 +461,6 @@
         "repo": "sops-nix",
         "type": "github"
       }
-    },
-    "systems": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
     }
   },
   "root": "root",

flake.nix

@@ -69,37 +69,54 @@
   in {
     inputs = lib.mapAttrs (_: src: src.outPath) inputs;
 
-    pkgs = forAllSystems (system:
-      import nixpkgs {
-        inherit system;
-        config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg)
-          [
-            "nvidia-x11"
-            "nvidia-settings"
-          ];
-      });
+    pkgs = forAllSystems (system: import nixpkgs {
+      inherit system;
+      config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg)
+        [
+          "nvidia-x11"
+          "nvidia-settings"
+        ];
+    });
 
     nixosConfigurations = let
-      unstablePkgs = nixpkgs-unstable.legacyPackages.x86_64-linux;
-
       nixosConfig =
         nixpkgs:
         name:
         configurationPath:
         extraArgs@{
-          system ? "x86_64-linux",
+          localSystem ? "x86_64-linux", # buildPlatform
+          crossSystem ? "x86_64-linux", # hostPlatform
           specialArgs ? { },
           modules ? [ ],
           overlays ? [ ],
           enableDefaults ? true,
           ...
         }:
+        let
+          commonPkgsConfig = {
+            inherit localSystem crossSystem;
+            config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg)
+              [
+                "nvidia-x11"
+                "nvidia-settings"
+              ];
+            overlays = (lib.optionals enableDefaults [
+              # Global overlays go here
+              inputs.roowho2.overlays.default
+            ]) ++ overlays;
+          };
+
+          pkgs = import nixpkgs commonPkgsConfig;
+          unstablePkgs = import nixpkgs-unstable commonPkgsConfig;
+        in
         lib.nixosSystem (lib.recursiveUpdate
         {
-          inherit system;
+          system = crossSystem;
+
+          inherit pkgs;
 
           specialArgs = {
-            inherit unstablePkgs inputs;
+            inherit inputs unstablePkgs;
             values = import ./values.nix;
             fp = path: ./${path};
           } // specialArgs;
@@ -113,22 +130,10 @@
             sops-nix.nixosModules.sops
             inputs.roowho2.nixosModules.default
           ]) ++ modules;
-
-          pkgs = import nixpkgs {
-            inherit system;
-            config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg)
-              [
-                "nvidia-x11"
-                "nvidia-settings"
-              ];
-            overlays = (lib.optionals enableDefaults [
-              # Global overlays go here
-              inputs.roowho2.overlays.default
-            ]) ++ overlays;
-          };
         }
         (builtins.removeAttrs extraArgs [
-          "system"
+          "localSystem"
+          "crossSystem"
           "modules"
           "overlays"
           "specialArgs"
@@ -163,7 +168,6 @@
       bekkalokk = stableNixosConfig "bekkalokk" {
         overlays = [
           (final: prev: {
-            heimdal = unstablePkgs.heimdal;
             mediawiki-extensions = final.callPackage ./packages/mediawiki-extensions { };
             simplesamlphp = final.callPackage ./packages/simplesamlphp { };
             bluemap = final.callPackage ./packages/bluemap.nix { };
@@ -221,17 +225,37 @@
           inputs.gergle.overlays.default
         ];
       };
-      skrott = stableNixosConfig "skrott" {
-        system = "aarch64-linux";
+    }
+    //
+    (let
+      skrottConfig = {
         modules = [
           (nixpkgs + "/nixos/modules/installer/sd-card/sd-image-aarch64.nix")
           inputs.dibbler.nixosModules.default
         ];
         overlays = [
           inputs.dibbler.overlays.default
+          (final: prev: {
+            atool = prev.emptyDirectory;
+            neovim = prev.vim;
+            micro = prev.vim;
+          })
         ];
       };
-    }
+    in {
+      skrott = stableNixosConfig "skrott" (skrottConfig // {
+        localSystem = "x86_64-linux";
+        crossSystem = "aarch64-linux";
+      });
+      skrott-x86_64 = stableNixosConfig "skrott" (skrottConfig // {
+        localSystem = "x86_64-linux";
+        crossSystem = "x86_64-linux";
+      });
+      skrott-native = stableNixosConfig "skrott" (skrottConfig // {
+        localSystem = "aarch64-linux";
+        crossSystem = "aarch64-linux";
+      });
+    })
     //
     (let
       machineNames = map (i: "lupine-${toString i}") (lib.range 1 5);
@@ -295,6 +319,7 @@
       # Skrott is exception
       {
         skrott = self.nixosConfigurations.skrott.config.system.build.sdImage;
+        skrott-native = self.nixosConfigurations.skrott-native.config.system.build.sdImage;
       }
       //
       # Nix-topology

hosts/skrott/configuration.nix

@@ -1,10 +1,13 @@
-{ config, pkgs, lib, fp, values, ... }: {
+{ config, pkgs, lib, modulesPath, fp, values, ... }: {
   imports = [
-    # ./hardware-configuration.nix
+    (modulesPath + "/profiles/perlless.nix")
 
     (fp /base)
   ];
 
+  # Disable import of a bunch of tools we don't need from nixpkgs.
+  disabledModules = [ "profiles/base.nix" ];
+
   sops.defaultSopsFile = fp /secrets/skrott/skrott.yaml;
 
   boot = {
@@ -16,6 +19,8 @@
   };
 
   # Now turn off a bunch of stuff lol
+  # TODO: can we reduce further?
+  # See also https://nixcademy.com/posts/minimizing-nixos-images/
   system.autoUpgrade.enable = lib.mkForce false;
   services.irqbalance.enable = lib.mkForce false;
   services.logrotate.enable = lib.mkForce false;
@@ -25,10 +30,16 @@
   services.udisks2.enable = lib.mkForce false;
   services.thermald.enable = lib.mkForce false;
   services.promtail.enable = lib.mkForce false;
-  boot.supportedFilesystems.zfs = lib.mkForce false;
+  # There aren't really that many firmware updates for rbpi3 anyway
+  services.fwupd.enable = lib.mkForce false;
+
   documentation.enable = lib.mkForce false;
 
-  # TODO: can we reduce further?
+  environment.enableAllTerminfo = lib.mkForce false;
+
+  programs.neovim.enable = lib.mkForce false;
+  programs.zsh.enable = lib.mkForce false;
+  programs.git.package = pkgs.gitMinimal;
 
   sops.secrets = {
     "dibbler/postgresql/password" = {