nixos/photonvision: init module

nixos/doc/manual/release-notes/rl-2405.section.md

@@ -42,6 +42,8 @@ In addition to numerous new and upgraded packages, this release has the followin
 
 - [Guix](https://guix.gnu.org), a functional package manager inspired by Nix. Available as [services.guix](#opt-services.guix.enable).
 
+- [PhotonVision](https://photonvision.org/), a free, fast, and easy-to-use computer vision solution for the FIRST® Robotics Competition.
+
 - [pyLoad](https://pyload.net/), a FOSS download manager written in Python. Available as [services.pyload](#opt-services.pyload.enable)
 
 - [maubot](https://github.com/maubot/maubot), a plugin-based Matrix bot framework. Available as [services.maubot](#opt-services.maubot.enable).

nixos/modules/module-list.nix

@@ -1259,6 +1259,7 @@
   ./services/video/go2rtc/default.nix
   ./services/video/frigate.nix
   ./services/video/mirakurun.nix
+  ./services/video/photonvision.nix
   ./services/video/replay-sorcery.nix
   ./services/video/mediamtx.nix
   ./services/video/unifi-video.nix

nixos/modules/services/video/photonvision.nix

@@ -0,0 +1,64 @@
+{ config, pkgs, lib, ... }:
+
+let
+  cfg = config.services.photonvision;
+in
+{
+  options = {
+    services.photonvision = {
+      enable = lib.mkEnableOption (lib.mdDoc "Enable PhotonVision");
+
+      package = lib.mkPackageOption pkgs "photonvision" {};
+
+      openFirewall = lib.mkOption {
+        description = lib.mdDoc ''
+          Whether to open the required ports in the firewall.
+        '';
+        default = false;
+        type = lib.types.bool;
+      };
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    systemd.services.photonvision = {
+      description = "PhotonVision, the free, fast, and easy-to-use computer vision solution for the FIRST Robotics Competition";
+
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
+
+      serviceConfig = {
+        ExecStart = lib.getExe cfg.package;
+
+        # ephemeral root directory
+        RuntimeDirectory = "photonvision";
+        RootDirectory = "/run/photonvision";
+
+        # setup persistent state and logs directories
+        StateDirectory = "photonvision";
+        LogsDirectory = "photonvision";
+
+        BindReadOnlyPaths = [
+          # mount the nix store read-only
+          "/nix/store"
+
+          # the JRE reads the user.home property from /etc/passwd
+          "/etc/passwd"
+        ];
+        BindPaths = [
+          # mount the configuration and logs directories to the host
+          "/var/lib/photonvision:/photonvision_config"
+          "/var/log/photonvision:/photonvision_config/logs"
+        ];
+
+        # for PhotonVision's dynamic libraries, which it writes to /tmp
+        PrivateTmp = true;
+      };
+    };
+
+    networking.firewall = lib.mkIf cfg.openFirewall {
+      allowedTCPPorts = [ 5800 ];
+      allowedTCPPortRanges = [{ from = 1180; to = 1190; }];
+    };
+  };
+}