add most basic nginx service

modules/module-list.nix

@@ -179,6 +179,7 @@
   ./services/ttys/agetty.nix
   ./services/web-servers/apache-httpd/default.nix
   ./services/web-servers/jboss/default.nix
+  ./services/web-servers/nginx/default.nix
   ./services/web-servers/tomcat.nix
   ./services/x11/desktop-managers/default.nix
   ./services/x11/display-managers/auto.nix

modules/services/web-servers/nginx/default.nix

@@ -0,0 +1,65 @@
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let
+  cfg = config.services.nginx;
+  configFile = pkgs.writeText "nginx.conf" ''
+    ${cfg.config}
+  '';
+in
+
+{
+  options = {
+    services.nginx = {
+      enable = mkOption {
+        default = false;
+        description = "
+          Enable the nginx Web Server.
+        ";
+      };
+
+      config = mkOption {
+        default = "";
+        description = "
+          Verbatim nginx.conf configuration.
+        ";
+      };
+
+      stateDir = mkOption {
+        default = "/var/spool/nginx";
+        description = "
+          Directory holding all state for nginx to run.
+        ";
+      };
+    };
+
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = [ pkgs.nginx ];
+
+    # TODO: test user supplied config file pases syntax test
+
+    systemd.services.nginx = {
+      description = "Nginx Web Server";
+      after = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+      path = [ pkgs.nginx ];
+      preStart =
+        ''
+        mkdir -p ${cfg.stateDir}/logs
+        chown -R nginx:nginx ${cfg.stateDir}
+        '';
+      serviceConfig = {
+        ExecStart = "${pkgs.nginx}/bin/nginx -c ${configFile} -p ${cfg.stateDir}";
+      };
+    };
+
+    users.extraUsers.nginx = {
+      group = "nginx";
+    };
+
+    users.extraGroups.nginx = {};
+  };
+}