patiodeck: add steam deck LCD host

hosts/patiodeck/default.nix

@@ -0,0 +1,66 @@
+{
+  pkgs,
+  lib,
+  username,
+  inputs,
+  site_config,
+  ...
+}:
+{
+  imports = [
+    ../../modules/desktop-common.nix
+    ../../modules/desktop-steam-update.nix
+    ./disk.nix
+    ./impermanence.nix
+
+    inputs.impermanence.nixosModules.impermanence
+    inputs.jovian-nixos.nixosModules.default
+  ];
+
+  networking.hostId = "a1b2c3d4";
+
+  # SSH for remote management from laptop
+  services.openssh = {
+    enable = true;
+    ports = [ 22 ];
+    settings = {
+      PasswordAuthentication = false;
+      PermitRootLogin = "yes";
+    };
+  };
+
+  users.users.${username}.openssh.authorizedKeys.keys = [
+    site_config.ssh_keys.laptop
+  ];
+
+  users.users.root.openssh.authorizedKeys.keys = [
+    site_config.ssh_keys.laptop
+  ];
+
+  nixpkgs.config.allowUnfreePredicate =
+    pkg:
+    builtins.elem (lib.getName pkg) [
+      "steamdeck-hw-theme"
+      "steam-jupiter-unwrapped"
+      "steam"
+      "steam-original"
+      "steam-unwrapped"
+      "steam-run"
+    ];
+
+  jovian = {
+    devices.steamdeck.enable = true;
+    steam = {
+      enable = true;
+      autoStart = true;
+      desktopSession = "niri";
+      user = username;
+    };
+  };
+
+  # Jovian-NixOS requires sddm
+  services.displayManager.sddm.wayland.enable = true;
+
+  # disable gamescope from desktop-common.nix to avoid conflict with jovian
+  programs.gamescope.enable = lib.mkForce false;
+}

hosts/patiodeck/disk.nix

@@ -0,0 +1,52 @@
+{
+  disko.devices = {
+    disk = {
+      main = {
+        type = "disk";
+        content = {
+          type = "gpt";
+          partitions = {
+            ESP = {
+              type = "EF00";
+              size = "500M";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+              };
+            };
+            persistent = {
+              size = "100%";
+              content = {
+                type = "filesystem";
+                format = "f2fs";
+                mountpoint = "/persistent";
+              };
+            };
+            nix = {
+              size = "200G";
+              content = {
+                type = "filesystem";
+                format = "f2fs";
+                mountpoint = "/nix";
+              };
+            };
+          };
+        };
+      };
+    };
+    nodev = {
+      "/" = {
+        fsType = "tmpfs";
+        mountOptions = [
+          "defaults"
+          "size=2G"
+          "mode=755"
+        ];
+      };
+    };
+  };
+
+  fileSystems."/persistent".neededForBoot = true;
+  fileSystems."/nix".neededForBoot = true;
+}

hosts/patiodeck/home.nix

@@ -0,0 +1,7 @@
+{ ... }:
+{
+  imports = [
+    ../../home/profiles/gui.nix
+    ../../home/profiles/desktop.nix
+  ];
+}

hosts/patiodeck/impermanence.nix

@@ -0,0 +1,48 @@
+{
+  username,
+  ...
+}:
+{
+  environment.persistence."/persistent" = {
+    hideMounts = true;
+    directories = [
+      "/var/log"
+      "/var/lib/systemd/coredump"
+      "/var/lib/nixos"
+      "/var/lib/systemd/timers"
+      # agenix identity sealed by the TPM
+      {
+        directory = "/var/lib/agenix";
+        mode = "0700";
+        user = "root";
+        group = "root";
+      }
+    ];
+
+    files = [
+      "/etc/ssh/ssh_host_ed25519_key"
+      "/etc/ssh/ssh_host_ed25519_key.pub"
+      "/etc/ssh/ssh_host_rsa_key"
+      "/etc/ssh/ssh_host_rsa_key.pub"
+      "/etc/machine-id"
+    ];
+
+    users.root = {
+      files = [
+        ".local/share/fish/fish_history"
+      ];
+    };
+  };
+
+  # bind mount home directory from persistent storage
+  fileSystems."/home/${username}" = {
+    device = "/persistent/home/${username}";
+    fsType = "none";
+    options = [ "bind" ];
+    neededForBoot = true;
+  };
+
+  systemd.tmpfiles.rules = [
+    "d /etc 755 root"
+  ];
+}