Run in VM

README.md

@@ -40,6 +40,16 @@ If you invoke the build from `x86_64-linux`, it'll cross-compile the sdcard
 image. If you build on an `aarch64-linux` box, it'll natively compile. Both
 works.
 
+### VM Test
+For a smaller feedback loop, it's possible to build a script running the
+software stack in a local qemu (KVM). It might have another virtual screen
+resolution, and obviously doesn't test the hardware bits.
+
+To run it, invoke:
+```
+$(nix-build nix -A vm)/bin/run-fossbeamer-vm
+```
+
 --
 [wip.bar]: https://wip.bar
 [Nix]: https://nixos.org

nix/configuration.nix

@@ -7,6 +7,15 @@
 }: {
   imports = [
     (modulesPath + "/installer/sd-card/sd-image-aarch64.nix")
+    ./profiles/kiosk.nix
+    ./profiles/networking.nix
+    ./profiles/ssh-server.nix
+  ];
+  # HACK: sd-image-aarch64.nix sets console=ttyS0,115200n8 (and some others),
+  # which breaks the device-tree provided serial config.
+  boot.kernelParams = lib.mkForce [
+    "systemd.log_target=console"
+    "systemd.journald.forward_to_console=1"
   ];
 
   # configure journald to not logs to disk
@@ -20,12 +29,6 @@
     lib.mkForce
       [ "vfat" ];
 
-  # HACK: sd-image-aarch64.nix sets console=ttyS0,115200n8 (and some others),
-  # which breaks the device-tree provided serial config.
-  boot.kernelParams = lib.mkForce [
-    "systemd.log_target=console"
-    "systemd.journald.forward_to_console=1"
-  ];
 
   # Switch to systemd-initrd, which is the future (tm).
   # Also it has proven to be a bit more permissive with some boards where the
@@ -34,72 +37,10 @@
 
   nix.settings.max-jobs = 8;
 
-  # Configure networking
-  networking.hostName = "fossbeamer";
-  networking.useDHCP = true;
-  networking.useNetworkd = true;
-  networking.wireless.iwd.enable = true;
-  networking.networkmanager.enable = false;
-  services.resolved.enable = true;
-  services.resolved.dnssec = "false";
-  networking.nftables.enable = true;
-
-  # Configure ssh
-  services.openssh = {
-    enable = true;
-    settings.PasswordAuthentication = false;
-    openFirewall = true;
-  };
-  users.users.root.openssh.authorizedKeys.keys = [
-    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPTVTXOutUZZjXLB0lUSgeKcSY/8mxKkC0ingGK1whD2 flokli"
-    "sk-ssh-ed25519@openssh.com AAAAGnNrLXNzaC1lZDI1NTE5QG9wZW5zc2guY29tAAAAIA34k0FVKDGNdJ8uk0Ytbvh6J8v+H86F4t6BXAIoW/7xAAAABHNzaDo= flokli 20240704 14321691"
-    "sk-ssh-ed25519@openssh.com AAAAGnNrLXNzaC1lZDI1NTE5QG9wZW5zc2guY29tAAAAIP7rdJ1klzK8nx74QQA8jYdFwznM1klLS0C7M5lHiu+IAAAABHNzaDo= flokli 20240617 28772765"
-    "ssh-rsa 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 Freya"
-  ];
-
-  programs.mosh.enable = true;
-
-
-  # Create a kiosk user
-  users.users.kiosk = {
-    isNormalUser = true;
-    uid = 1000;
-  };
-
-  # And configure cage to show fossbeamer on it.
-  services.cage = {
-    enable = true;
-    user = "kiosk";
-    program = pkgs.writers.writeBash "run-cage-program" ''
-      ${pkgs.wlr-randr}/bin/wlr-randr --output HDMI-A-1 --transform 180 --scale 2
-      ${pkgs.fossbeamer}/bin/fossbeamer --default-config=${../default-config.json} https://wip.bar
-    '';
-    environment = {
-      GST_PLUGIN_SYSTEM_PATH_1_0 = lib.makeSearchPathOutput "lib" "lib/gstreamer-1.0" (with pkgs.gst_all_1;[
-        gstreamer
-        gst-plugins-base
-        gst-plugins-good
-        gst-plugins-bad
-        gst-libav
-      ]);
-      GIO_MODULE_DIR = "${pkgs.glib-networking}/lib/gio/modules/";
-      LIBGL_DEBUG = "verbose";
-      RUST_LOG = "debug";
-    };
-    extraArguments = [
-      "-d" # don't draw client decorations when possible
-    ];
-  };
-  systemd.services."cage-tty1".restartIfChanged = lib.mkForce true;
-
   environment.systemPackages = [
-    pkgs.htop
     pkgs.kmsxx # kmsprint
     pkgs.i2c-tools
   ];
 
-  documentation.enable = false; # Reduces closure size and build time.
-
-  users.users."root".initialPassword = "";
   system.stateVersion = "24.05";
 }

nix/default.nix

@@ -34,6 +34,7 @@ let
 
   machine-generic = (pkgsAArch64.nixos ./configuration.nix);
   machine-cm3 = (pkgsAArch64.nixos ./configuration-cm3.nix);
+  vm = (pkgs.nixos ./configuration.nix).vm;
 
 in
 rec {
@@ -58,7 +59,7 @@ rec {
     '';
   };
 
-  inherit machine-generic machine-cm3;
+  inherit machine-generic machine-cm3 vm;
 
   env = pkgs.buildEnv {
     name = "dev-env";

nix/profiles/kiosk.nix

@@ -0,0 +1,40 @@
+{ lib, pkgs, ... }: {
+  # Create a kiosk user
+  users.users.kiosk = {
+    isNormalUser = true;
+    uid = 1000;
+    packages = [ pkgs.dconf ];
+  };
+
+  # And configure cage to show fossbeamer on it.
+  services.cage = {
+    enable = true;
+    user = "kiosk";
+    program = pkgs.writers.writeBash "run-cage-program" ''
+      ${pkgs.wlr-randr}/bin/wlr-randr --output HDMI-A-1 --transform 180 --scale 2
+      ${pkgs.fossbeamer}/bin/fossbeamer --default-config=${../../default-config.json} https://wip.bar
+    '';
+    environment = {
+      GST_PLUGIN_SYSTEM_PATH_1_0 = lib.makeSearchPathOutput "lib" "lib/gstreamer-1.0" (with pkgs.gst_all_1;[
+        gstreamer
+        gst-plugins-base
+        gst-plugins-good
+        gst-plugins-bad
+        gst-libav
+      ]);
+      GIO_MODULE_DIR = "${pkgs.glib-networking}/lib/gio/modules/";
+      LIBGL_DEBUG = "verbose";
+      RUST_LOG = "debug";
+    };
+    extraArguments = [
+      "-d" # don't draw client decorations when possible
+    ];
+  };
+  systemd.services."cage-tty1".restartIfChanged = lib.mkForce true;
+
+  environment.systemPackages = [
+    pkgs.htop
+  ];
+
+  documentation.enable = false; # Reduces closure size and build time.
+}

nix/profiles/networking.nix

@@ -0,0 +1,12 @@
+{ ... }: {
+  # Configure networking
+  networking.hostName = "fossbeamer";
+  networking.useDHCP = true;
+  networking.useNetworkd = true;
+  networking.wireless.iwd.enable = true;
+  networking.networkmanager.enable = false;
+  services.resolved.enable = true;
+  services.resolved.dnssec = "false";
+  networking.nftables.enable = true;
+}
+

nix/profiles/ssh-server.nix

@@ -0,0 +1,20 @@
+{ ... }: {
+
+  # Configure ssh
+  services.openssh = {
+    enable = true;
+    settings.PasswordAuthentication = false;
+    openFirewall = true;
+  };
+  users.users.root.openssh.authorizedKeys.keys = [
+    "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPTVTXOutUZZjXLB0lUSgeKcSY/8mxKkC0ingGK1whD2 flokli"
+    "sk-ssh-ed25519@openssh.com AAAAGnNrLXNzaC1lZDI1NTE5QG9wZW5zc2guY29tAAAAIA34k0FVKDGNdJ8uk0Ytbvh6J8v+H86F4t6BXAIoW/7xAAAABHNzaDo= flokli 20240704 14321691"
+    "sk-ssh-ed25519@openssh.com AAAAGnNrLXNzaC1lZDI1NTE5QG9wZW5zc2guY29tAAAAIP7rdJ1klzK8nx74QQA8jYdFwznM1klLS0C7M5lHiu+IAAAABHNzaDo= flokli 20240617 28772765"
+    "ssh-rsa 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 Freya"
+  ];
+
+  programs.mosh.enable = true;
+
+  # Allow logging in via serial without password.
+  users.users."root".initialPassword = "";
+}