feat: add support for docker-rootless

nixos-module.nix

@@ -1,9 +1,11 @@
 { config, lib, pkgs, ... }:
 let
   inherit (lib)
+    any
     attrValues
     mkIf
     mkOption
+    mkEnableOption
     mkMerge
     types
     ;
@@ -25,26 +27,31 @@ let
         type = arionSettingsType name;
         visible = "shallow";
       };
+      rootless = mkEnableOption "Run this project in rootless mode";
       _systemd = mkOption { internal = true; };
     };
     config =
-      let service = {
+      let
-        wantedBy = [ "multi-user.target" ];
+
-        after = [ "sockets.target" ];
+        service = {
+          wantedBy = [ "multi-user.target" ];
+          after = [ "sockets.target" ];
+
+          path = [
+            cfg.package
+            cfg.docker.client.package
+          ];
+          environment.ARION_PREBUILT = config.settings.out.dockerComposeYaml;
+          environment.DOCKER_HOST = mkIf config.rootless "unix:///run/user/1000/docker.sock"; # TODO: Do not hardcode path
+          script = ''
+            echo 1>&2 "docker compose file: $ARION_PREBUILT"
+            arion --prebuilt-file "$ARION_PREBUILT" up
+          '';
+        };
 
-        path = [
-          cfg.package
-          cfg.docker.client.package
-        ];
-        environment.ARION_PREBUILT = config.settings.out.dockerComposeYaml;
-        environment.DOCKER_HOST = mkIf (cfg.backend == "docker-rootless") "unix:///run/user/1000/docker.sock";
-        script = ''
-          echo 1>&2 "docker compose file: $ARION_PREBUILT"
-          arion --prebuilt-file "$ARION_PREBUILT" up
-        '';
-      };
     in
-      if cfg.backend == "docker-rootless" then
+      if false then
+      # if false then
         { _systemd.user.services."arion-${name}" = service; }
       else
         { _systemd.services."arion-${name}" = service; };
@@ -110,14 +117,8 @@ in
         virtualisation.docker.enable = true;
         virtualisation.arion.docker.client.package = pkgs.docker;
       })
-      (mkIf (cfg.backend == "docker-rootless") {
+      (mkIf (any (project: project.rootless) (attrValues cfg.projects)) {
-        virtualisation = {
+        virtualisation.docker.rootless.enable = true;
-          docker.rootless = {
-            enable = true;
-            setSocketVariable = true;
-          };
-        };
-        virtualisation.arion.docker.client.package = pkgs.docker;
       })
     ]
   );