Add pi definition

Flake lock file updates:

• Updated input 'nixos-hardware':
    'github:NixOS/nixos-hardware/a89745edd5f657e2e5be5ed1bea86725ca78d92e' (2023-12-03)
  → 'github:NixOS/nixos-hardware/fa194fc484fd7270ab324bb985593f71102e84d1' (2023-12-04)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/5de0b32be6e85dc1a9404c75131316e4ffbc634c' (2023-12-01)
  → 'github:NixOS/nixpkgs/933d7dc155096e7575d207be6fb7792bc9f34f6d' (2023-12-02)

flake.lock

@@ -100,6 +100,21 @@
         "type": "github"
       }
     },
+    "nixos-hardware": {
+      "locked": {
+        "lastModified": 1701656485,
+        "narHash": "sha256-xDFormrGCKKGqngHa2Bz1GTeKlFMMjLnHhTDRdMJ1hs=",
+        "owner": "NixOS",
+        "repo": "nixos-hardware",
+        "rev": "fa194fc484fd7270ab324bb985593f71102e84d1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixos-hardware",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1677676435,
@@ -136,6 +151,7 @@
         "agenix": "agenix",
         "firefox-gnome-theme": "firefox-gnome-theme",
         "home-manager": "home-manager_2",
+        "nixos-hardware": "nixos-hardware",
         "nixpkgs": "nixpkgs_2",
         "thunderbird-gnome-theme": "thunderbird-gnome-theme"
       }

flake.nix

@@ -3,6 +3,7 @@
 
   inputs = {
     nixpkgs.url = "nixpkgs/nixos-23.11";
+    nixos-hardware.url = "github:NixOS/nixos-hardware";
     agenix.url = "github:ryantm/agenix";
     home-manager = {
       url = "github:nix-community/home-manager/release-23.11";
@@ -80,6 +81,15 @@
           ];
           specialArgs = { inherit lib inputs; };
         };
+        pi = nixpkgs.lib.nixosSystem {
+          modules = [
+            home-manager.nixosModules.home-manager
+            agenix.nixosModules.default
+            (import ./modules)
+            ./hosts/pi
+          ];
+          specialArgs = { inherit lib inputs; };
+        };
       };
   };
 }

hosts/pi/default.nix

@@ -0,0 +1,58 @@
+{ config, lib, pkgs, ... }:
+
+with lib.my;
+{
+  imports = [
+    ./hardware-configuration.nix
+    ../server.nix
+  ];
+
+  networking.hostName = "pi";
+  networking.hostId = "";
+
+  hardware = {
+    raspberry-pi."4" = {
+      apply-overlays-dtmerge.enable = true;
+      fkms-3d.enable = true;
+    };
+    deviceTree = {
+      enable = true;
+      filter = "*rpi-4-*.dtb";
+    };
+  };
+
+  sound.enable = true;
+  console.enable = false;
+
+  security.rtkit.enable = true;
+  services.pipewire = {
+    enable = true;
+    alsa.enable = true;
+    alsa.support32Bit = true;
+    pulse.enable = true;
+    systemWide = true;
+  };
+
+  services.shairport-sync = {
+    enable = true;
+    group = [ "pipewire" ];
+    openFirewall = true;
+  };
+
+  services.zigbee2mqtt = {
+    enable = true;
+    settings = {
+      homeassistant = true;
+      frontend = true;
+      permit_join = true;
+    };
+  };
+
+  environment.systemPackages = with pkgs; [
+    libraspberrypi
+    raspberrypi-eeprom
+  ];
+
+  system.stateVersion = "22.11";
+}
+

hosts/pi/hardware-configuration.nix

@@ -0,0 +1,21 @@
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports = [
+    <nixos-hardware/raspberry-pi/4>
+  ];
+
+  boot.loader.raspberryPi.firmwareConfig = ''
+    dtoverlay=vc4-kms-v3d,noaudio
+    dtoverlay=hifiberry-digi-pro
+  '';
+
+  fileSystems = {
+    "/" = {
+      device = "/dev/disk/by-label/NIXOS_SD";
+      fsType = "ext4";
+      options = [ "noatime" ];
+    };
+  };
+}
+