Move all of NixOS to nixos/ in preparation of the repository merge

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

@@ -0,0 +1,88 @@
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let
+  cfg = config.services.nginx;
+  nginx = pkgs.nginx.override { fullWebDAV = cfg.fullWebDAV; };
+  configFile = pkgs.writeText "nginx.conf" ''
+    user ${cfg.user} ${cfg.group};
+    daemon off;
+    ${cfg.config}
+  '';
+in
+
+{
+  options = {
+    services.nginx = {
+      enable = mkOption {
+        default = false;
+        description = "
+          Enable the nginx Web Server.
+        ";
+      };
+
+      config = mkOption {
+        default = "events {}";
+        description = "
+          Verbatim nginx.conf configuration.
+        ";
+      };
+
+      stateDir = mkOption {
+        default = "/var/spool/nginx";
+        description = "
+          Directory holding all state for nginx to run.
+        ";
+      };
+
+      user = mkOption {
+        default = "nginx";
+        description = "User account under which nginx runs.";
+      };
+
+      group = mkOption {
+        default = "nginx";
+        description = "Group account under which nginx runs.";
+      };
+
+      fullWebDAV = mkOption {
+        default = false;
+        description = "Compile in a third party module providing full WebDAV support";
+      };
+    };
+
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = [ 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 = [ nginx ];
+      preStart =
+        ''
+        mkdir -p ${cfg.stateDir}/logs
+        chown -R ${cfg.user}:${cfg.group} ${cfg.stateDir}
+        '';
+      serviceConfig = {
+        ExecStart = "${nginx}/bin/nginx -c ${configFile} -p ${cfg.stateDir}";
+      };
+    };
+
+    users.extraUsers = optionalAttrs (cfg.user == "nginx") (singleton
+      { name = "nginx";
+        group = "nginx";
+        uid = config.ids.uids.nginx;
+      });
+
+    users.extraGroups = optionalAttrs (cfg.group == "nginx") (singleton
+      { name = "nginx";
+        gid = config.ids.gids.nginx;
+      });
+  };
+}