Add custom impermanence module

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/user/configs/gui/swww/default.nix

@@ -1,14 +1,16 @@
 {
-  username ? throw "username argument is required",
+  user ? throw "user argument is required",
+  home ? throw "home argument is required",
 }:
 {
   config,
   lib,
+  utils,
   pkgs,
   ...
 }:
 let
-  hmConfig = config.home-manager.users.${username};
+  hmConfig = config.home-manager.users.${user};
   themeSwww = lib.meta.getExe (
     pkgs.writeShellApplication {
       name = "theme-swww";
@@ -21,18 +23,19 @@ let
   );
 in
 {
-  environment.persistence."/cache".users.${username}.directories = [
-    "${hmConfig.xdg.relativeCacheHome}/swww"
-  ];
+  environment.persistence."/cache"."${home}/.cache/swww" = { };
 
-  home-manager.users.${username} = {
+  home-manager.users.${user} = {
     home.packages = with pkgs; [ swww ];
 
     systemd.user.services.swww = {
       Unit = {
         Description = "Wallpaper daemon";
         BindsTo = [ "graphical-session.target" ];
-        After = [ "graphical-session.target" ];
+        After = [
+          "graphical-session.target"
+          config.environment.persistence."/cache"."${home}/.cache/swww".mount
+        ];
       };
 
       Service = {