rico*: put pi specific stuff in a module

hosts/rico0/default.nix

@@ -11,16 +11,9 @@ _: {
   nodeconfig = {
     minimize = true;
     nix.auto-gc = true;
+    is-pi = true;
   };
 
-  # https://github.com/NixOS/nixpkgs/issues/126755#issuecomment-869149243
-  nixpkgs.overlays = [
-    (final: super: {
-      makeModulesClosure = x:
-        super.makeModulesClosure (x // { allowMissing = true; });
-    })
-  ];
-
   i18n = {
     defaultLocale = "en_US.UTF-8";
     extraLocaleSettings = {

hosts/rico0/hardware/default.nix

@@ -1,15 +1,11 @@
-{ lib, pkgs, ... }: {
+{ lib, ... }: {
   imports = [ ./filesystem.nix ];
 
-  hardware.enableRedistributableFirmware = true;
-
   boot = {
     consoleLogLevel = 3;
     initrd = {
-      availableKernelModules = [ "xhci_pci" ];
       systemd.enable = true;
     };
-    kernelPackages = lib.mkDefault pkgs.linuxPackages_rpi4;
     kernel.sysctl = {
       "vm.swappiness" = 10;
       "vm.dirty_ratio" = 3;

hosts/rico0/programs/default.nix

@@ -12,8 +12,6 @@
   environment.systemPackages = with pkgs; [
     sops
     age
-    libraspberrypi
-    raspberrypi-eeprom
   ];
 
 }

hosts/rico1/default.nix

@@ -11,16 +11,9 @@ _: {
   nodeconfig = {
     minimize = true;
     nix.auto-gc = true;
+    is-pi = true;
   };
 
-  # https://github.com/NixOS/nixpkgs/issues/126755#issuecomment-869149243
-  nixpkgs.overlays = [
-    (final: super: {
-      makeModulesClosure = x:
-        super.makeModulesClosure (x // { allowMissing = true; });
-    })
-  ];
-
   i18n = {
     defaultLocale = "en_US.UTF-8";
     extraLocaleSettings = {

hosts/rico1/hardware/default.nix

@@ -1,15 +1,11 @@
-{ lib, pkgs, ... }: {
+{ lib, ... }: {
   imports = [ ./filesystem.nix ];
 
-  hardware.enableRedistributableFirmware = true;
-
   boot = {
     consoleLogLevel = 3;
     initrd = {
-      availableKernelModules = [ "xhci_pci" ];
       systemd.enable = true;
     };
-    kernelPackages = lib.mkDefault pkgs.linuxPackages_rpi4;
     kernel.sysctl = {
       "vm.swappiness" = 10;
       "vm.dirty_ratio" = 3;

hosts/rico1/programs/default.nix

@@ -12,8 +12,6 @@
   environment.systemPackages = with pkgs; [
     sops
     age
-    libraspberrypi
-    raspberrypi-eeprom
   ];
 
 }

hosts/rico2/default.nix

@@ -11,16 +11,9 @@ _: {
   nodeconfig = {
     minimize = true;
     nix.auto-gc = true;
+    is-pi = true;
   };
 
-  # https://github.com/NixOS/nixpkgs/issues/126755#issuecomment-869149243
-  nixpkgs.overlays = [
-    (final: super: {
-      makeModulesClosure = x:
-        super.makeModulesClosure (x // { allowMissing = true; });
-    })
-  ];
-
   i18n = {
     defaultLocale = "en_US.UTF-8";
     extraLocaleSettings = {

hosts/rico2/hardware/default.nix

@@ -1,15 +1,11 @@
-{ lib, pkgs, ... }: {
+{ lib, ... }: {
   imports = [ ./filesystem.nix ];
 
-  hardware.enableRedistributableFirmware = true;
-
   boot = {
     consoleLogLevel = 3;
     initrd = {
-      availableKernelModules = [ "xhci_pci" ];
       systemd.enable = true;
     };
-    kernelPackages = lib.mkDefault pkgs.linuxPackages_rpi4;
     kernel.sysctl = {
       "vm.swappiness" = 10;
       "vm.dirty_ratio" = 3;

hosts/rico2/programs/default.nix

@@ -12,8 +12,6 @@
   environment.systemPackages = with pkgs; [
     sops
     age
-    libraspberrypi
-    raspberrypi-eeprom
   ];
 
 }

modules/default.nix

@@ -2,5 +2,6 @@ _: {
   imports = [
     ./general.nix
     ./nix.nix
+    ./pi.nix
   ];
 }

modules/pi.nix

@@ -0,0 +1,33 @@
+{ lib, config, pkgs, ... }:
+let cfg = config.nodeconfig; in {
+  options.nodeconfig = {
+    is-pi = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      example = true;
+      description = "Is the node a Raspberry Pi?";
+    };
+  };
+
+  config = lib.mkIf cfg.is-pi {
+    # https://github.com/NixOS/nixpkgs/issues/126755#issuecomment-869149243
+    nixpkgs.overlays = [
+      (final: super: {
+        makeModulesClosure = x:
+          super.makeModulesClosure (x // { allowMissing = true; });
+      })
+    ];
+
+    boot = {
+      kernelPackages = lib.mkDefault pkgs.linuxPackages_rpi4;
+      initrd.availableKernelModules = [ "xhci_pci" ];
+    };
+
+    environment.systemPackages = with pkgs; [
+      libraspberrypi
+      raspberrypi-eeprom
+    ];
+
+    hardware.enableRedistributableFirmware = true;
+  };
+}