feat: Export NixOS Module for usda-vision service config

flake.nix

@@ -95,6 +95,9 @@
           DOCKER_BUILDKIT = "1";
           COMPOSE_DOCKER_CLI_BUILD = "1";
         };
+
+        # NixOS module for deployment
+        nixosModules.default = import ./module.nix;
       }
     );
 }

module.nix

@@ -0,0 +1,160 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.services.usda-vision;
+  
+  # Get packages from the flake (self reference)
+  camera-sdk = config.services.usda-vision.package.camera-sdk or pkgs.callPackage ./camera-sdk.nix {};
+  usda-vision-app = config.services.usda-vision.package.usda-vision or pkgs.callPackage ./package.nix {};
+in
+
+{
+  options.services.usda-vision = {
+    enable = lib.mkEnableOption "USDA Vision system";
+    
+    package = lib.mkOption {
+      type = lib.types.attrs;
+      default = {};
+      description = "Package set containing camera-sdk and usda-vision packages";
+    };
+    
+    hostname = lib.mkOption {
+      type = lib.types.str;
+      default = "exp-dash";
+      description = "Hostname or IP address to replace exp-dash and localhost with in configuration";
+    };
+    
+    replaceHostnames = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      description = "Whether to replace exp-dash and localhost hostnames with the configured hostname";
+    };
+    
+    envFile = lib.mkOption {
+      type = lib.types.nullOr lib.types.path;
+      default = null;
+      description = "Path to environment file (managed by ragenix in deployment)";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    # System packages
+    environment.systemPackages = with pkgs; [
+      docker
+      docker-compose
+      supabase-cli
+      camera-sdk
+      usda-vision-app
+    ];
+    
+    # Make camera SDK libraries available system-wide
+    environment.variables = {
+      LD_LIBRARY_PATH = "${camera-sdk}/lib";
+    };
+
+    # Enable Docker service
+    virtualisation.docker = {
+      enable = true;
+      autoPrune.enable = true;
+      daemon.settings = {
+        experimental = true;
+      };
+    };
+
+    # Create persistent directories
+    systemd.tmpfiles.rules = [
+      "d /var/lib/usda-vision 0755 root root -"
+      "f /var/lib/usda-vision/.env 0644 root root -"
+      "d /var/lib/supabase 0755 root root -"
+    ];
+
+    # Supabase CLI service
+    systemd.services.supabase-cli = {
+      enable = true;
+      description = "Supabase CLI Service";
+      
+      preStart = ''
+        rm -rf /var/lib/supabase/*
+        rm -rf /var/lib/supabase/.* 2>/dev/null || true
+        
+        if [ -d ${usda-vision-app}/opt/usda-vision/supabase ]; then
+          ${pkgs.rsync}/bin/rsync -av ${usda-vision-app}/opt/usda-vision/supabase/ /var/lib/supabase/supabase/
+        fi
+        
+        mkdir -p /var/lib/supabase/supabase/.branches
+        chmod -R 755 /var/lib/supabase
+      '';
+      
+      serviceConfig = {
+        WorkingDirectory = "/var/lib/supabase";
+        EnvironmentFile = lib.mkIf (cfg.envFile != null) cfg.envFile;
+        ExecStart = "${pkgs.supabase-cli}/bin/supabase start";
+        ExecStop = "${pkgs.supabase-cli}/bin/supabase stop";
+        Type = "oneshot";
+        RemainAfterExit = true;
+        User = "root";
+        Group = "root";
+      };
+    };
+
+    # USDA Vision docker compose service
+    systemd.services.usda-vision = {
+      description = "USDA Vision Docker Compose Stack";
+      after = [ "docker.service" "network-online.target" "systemd-tmpfiles-setup.service" ];
+      wants = [ "network-online.target" ];
+      wantedBy = [ "multi-user.target" ];
+      
+      unitConfig = lib.mkIf (cfg.envFile != null) {
+        ConditionPathExists = cfg.envFile;
+      };
+      
+      preStart = ''
+        echo "Syncing application code to /var/lib/usda-vision..."
+        ${pkgs.rsync}/bin/rsync -av --delete \
+          --checksum \
+          --exclude='node_modules' \
+          --exclude='.env' \
+          --exclude='.env.azure' \
+          --exclude='__pycache__' \
+          --exclude='.venv' \
+          ${usda-vision-app}/opt/usda-vision/ /var/lib/usda-vision/
+        
+        ${lib.optionalString cfg.replaceHostnames ''
+          echo "Replacing hostnames (exp-dash, localhost) with ${cfg.hostname} in docker-compose.yml..."
+          ${pkgs.gnused}/bin/sed -i \
+            -e 's|exp-dash|${cfg.hostname}|g' \
+            -e 's|localhost|${cfg.hostname}|g' \
+            /var/lib/usda-vision/docker-compose.yml
+        ''}
+        
+        ${lib.optionalString (cfg.envFile != null) ''
+          echo "Copying environment file from managed secret..."
+          cp ${cfg.envFile} /var/lib/usda-vision/.env
+          chmod 644 /var/lib/usda-vision/.env
+        ''}
+        
+        ${lib.optionalString (cfg.envFile == null) ''
+          if [ ! -s /var/lib/usda-vision/.env ]; then
+            if [ -f ${usda-vision-app}/opt/usda-vision/.env.example ]; then
+              echo "WARNING: No environment file provided, using .env.example"
+              cp ${usda-vision-app}/opt/usda-vision/.env.example /var/lib/usda-vision/.env
+            fi
+          fi
+        ''}
+      '';
+
+      serviceConfig = {
+        Type = "oneshot";
+        RemainAfterExit = true;
+        WorkingDirectory = "/var/lib/usda-vision";
+        User = "root";
+        Group = "root";
+        ExecStart = "${pkgs.docker-compose}/bin/docker-compose -f /var/lib/usda-vision/docker-compose.yml up -d --build";
+        ExecStop = "${pkgs.docker-compose}/bin/docker-compose -f /var/lib/usda-vision/docker-compose.yml down";
+        ExecReload = "${pkgs.bash}/bin/bash -c '${pkgs.docker-compose}/bin/docker-compose -f /var/lib/usda-vision/docker-compose.yml down && ${pkgs.docker-compose}/bin/docker-compose -f /var/lib/usda-vision/docker-compose.yml up -d --build'";
+        TimeoutStartSec = 300;
+        TimeoutStopSec = 120;
+      };
+    };
+  };
+}