snowfall lib migration WIP

modules/nixos/services/syncthing/default.nix

@@ -0,0 +1,40 @@
+{
+  lib,
+  pkgs,
+  inputs,
+  namespace,
+  system,
+  target,
+  format,
+  virtual,
+  systems,
+  config,
+  ...
+}:
+with lib;
+with lib.${namespace}; let
+  cfg = config.${namespace}.services.syncthing;
+  impermanence = config.${namespace}.impermanence;
+in {
+  options.${namespace}.services.syncthing = with types; {
+    enable = mkBoolOpt false "Enable syncthing service for the user";
+    user = lib.mkOption {
+        type = lib.types.singleLineStr;
+        default = "";
+        example = "nixos";
+        description = ''
+          User, that will use the syncthing service (only one at a time)
+        '';
+      };
+  };
+
+  config =
+    mkIf cfg.enable {
+      systemd.services.syncthing.environment.STNODEFAULTFOLDER = "true"; # Don't create default ~/Sync folder
+  services.syncthing = {
+    inherit (cfg) user;
+    configDir = optional (impermanence.enable) "${impermanence.persistentStorage}/home/${cfg.user}/.config/syncthing";
+    enable = true;
+  };
+    };
+}