nix: vms for testing ghostty

.gitignore

@@ -17,3 +17,4 @@ test/cases/**/*.actual.png
 glad.zip
 /Box_test.ppm
 /Box_test_diff.ppm
+/ghostty.qcow2

flake.nix

@@ -31,7 +31,9 @@
     zig,
     ...
   }:
-    builtins.foldl' nixpkgs-stable.lib.recursiveUpdate {} (builtins.map (system: let
+    builtins.foldl' nixpkgs-stable.lib.recursiveUpdate {} (
+      builtins.map (
+        system: let
           pkgs-stable = nixpkgs-stable.legacyPackages.${system};
           pkgs-unstable = nixpkgs-unstable.legacyPackages.${system};
         in {
@@ -57,11 +59,56 @@
 
           formatter.${system} = pkgs-stable.alejandra;
 
+          nixosConfigurations = let
+            makeVM = (
+              path:
+                nixpkgs-stable.lib.nixosSystem {
+                  inherit system;
+                  modules = [
+                    {
+                      nixpkgs.overlays = [
+                        self.overlays.debug
+                      ];
+                    }
+                    ./nix/vm/common.nix
+                    path
+                  ];
+                }
+            );
+          in {
+            "wayland-gnome-${system}" = makeVM ./nix/vm/wayland-gnome.nix;
+          };
+
+          apps.${system} = let
+            wrapVM = (
+              name: let
+                program = pkgs-stable.writeShellScript "run-ghostty-vm" ''
+                  SHARED_DIR=$(pwd)
+                  export SHARED_DIR
+
+                  ${self.nixosConfigurations."${name}-${system}".config.system.build.vm}/bin/run-ghostty-vm
+                '';
+              in {
+                type = "app";
+                program = "${program}";
+              }
+            );
+          in {
+            wayland-gnome = wrapVM "wayland-gnome";
+          };
+        }
         # Our supported systems are the same supported systems as the Zig binaries.
-    }) (builtins.attrNames zig.packages))
+      ) (builtins.attrNames zig.packages)
+    )
     // {
-      overlays.default = final: prev: {
-        ghostty = self.packages.${prev.system}.default;
+      overlays = {
+        default = self.overlays.releasefast;
+        releasefast = final: prev: {
+          ghostty = self.packages.${prev.system}.ghostty-releasefast;
+        };
+        debug = final: prev: {
+          ghostty = self.packages.${prev.system}.ghostty-debug;
+        };
       };
     };
 

nix/vm/common.nix

@@ -0,0 +1,33 @@
+{pkgs, ...}: {
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+
+  networking.hostName = "ghostty";
+  networking.domain = "mitchellh.com";
+
+  virtualisation.vmVariant = {
+    virtualisation.memorySize = 2048;
+  };
+
+  users.mutableUsers = true;
+
+  users.groups.ghostty = {
+    gid = 1000;
+  };
+
+  users.users.ghostty = {
+    description = "Ghostty";
+    uid = 1000;
+    group = "ghostty";
+    extraGroups = ["wheel"];
+    isNormalUser = true;
+    initialPassword = "ghostty";
+  };
+
+  environment.systemPackages = [
+    pkgs.kitty
+    pkgs.ghostty
+  ];
+
+  system.stateVersion = "24.11";
+}

nix/vm/wayland-gnome.nix

@@ -0,0 +1,107 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: {
+  services.displayManager = {
+    autoLogin = {
+      user = "ghostty";
+    };
+  };
+
+  services.xserver = {
+    enable = true;
+    displayManager = {
+      gdm = {
+        enable = true;
+        autoSuspend = false;
+      };
+    };
+    desktopManager = {
+      gnome = {
+        enable = true;
+      };
+    };
+  };
+
+  environment.etc = {
+    "xdg/autostart/com.mitchellh.ghostty.desktop" = {
+      source = "${pkgs.ghostty}/share/applications/com.mitchellh.ghostty.desktop";
+    };
+  };
+
+  environment.systemPackages = [
+    pkgs.gnomeExtensions.no-overview
+  ];
+
+  environment.gnome.excludePackages = with pkgs; [
+    atomix
+    cheese
+    epiphany
+    geary
+    gnome-music
+    gnome-photos
+    gnome-tour
+    hitori
+    iagno
+    tali
+  ];
+
+  system.activationScripts = {
+    face = {
+      text = ''
+        mkdir -p /var/lib/AccountsService/{icons,users}
+
+        cp ${pkgs.ghostty}/share/icons/hicolor/1024x1024/apps/com.mitchellh.ghostty.png /var/lib/AccountsService/icons/ghostty
+
+        echo -e "[User]\nIcon=/var/lib/AccountsService/icons/ghostty\n" > /var/lib/AccountsService/users/ghostty
+
+        chown root:root /var/lib/AccountsService/users/ghostty
+        chmod 0600 /var/lib/AccountsService/users/ghostty
+
+        chown root:root /var/lib/AccountsService/icons/ghostty
+        chmod 0444 /var/lib/AccountsService/icons/ghostty
+      '';
+    };
+  };
+
+  programs.dconf = {
+    enable = true;
+    profiles.user.databases = [
+      {
+        settings = with lib.gvariant; {
+          "org/gnome/desktop/background" = {
+            picture-uri = "file://${pkgs.ghostty}/share/icons/hicolor/512x512/apps/com.mitchellh.ghostty.png";
+            picture-uri-dark = "file://${pkgs.ghostty}/share/icons/hicolor/512x512/apps/com.mitchellh.ghostty.png";
+            picture-options = "centered";
+            primary-color = "#000000000000";
+            secondary-color = "#000000000000";
+          };
+          "org/gnome/desktop/desktop" = {
+            interface = "prefer-dark";
+          };
+          "org/gnome/desktop/notifications" = {
+            show-in-lock-screen = false;
+          };
+          "org/gnome/desktop/screensaver" = {
+            lock-enabled = false;
+            picture-uri = "file://${pkgs.ghostty}/share/icons/hicolor/512x512/apps/com.mitchellh.ghostty.png";
+            picture-options = "centered";
+            primary-color = "#000000000000";
+            secondary-color = "#000000000000";
+          };
+          "org/gnome/desktop/session" = {
+            idle-delay = mkUint32 0;
+          };
+          "org/gnome/shell" = {
+            disable-user-extensions = false;
+            enabled-extensions = builtins.map (x: x.extensionUuid) (
+              lib.filter (p: p ? extensionUuid) config.environment.systemPackages
+            );
+          };
+        };
+      }
+    ];
+  };
+}