feat: custom nix store

src/nix/docker-compose-module.nix

@@ -9,7 +9,7 @@
     - docker-compose.services
 
  */
-{ pkgs, uid, lib, config, ... }:
+{ pkgs, uid, lib, config, customNixRootPath, ... }:
 
 let
   evalService = name: modules:
@@ -30,6 +30,7 @@ let
         key = ./docker-compose-module.nix;
         config._module.args.pkgs = lib.mkForce pkgs;
         config._module.args.uid = uid;
+        config._module.args.customNixRootPath = customNixRootPath;
       };
 
     in

src/nix/eval-composition.nix

@@ -1,4 +1,4 @@
-{ modules ? [], uid ? 0, pkgs }:
+{ modules ? [], uid ? 0, pkgs, customNixRootPath ? "", }:
 
 let _pkgs = pkgs;
 in
@@ -26,6 +26,7 @@ let
     key = ./eval-composition.nix;
     config._module.args.pkgs = lib.mkIf (pkgs != null) (lib.mkForce pkgs);
     config._module.args.uid = uid;
+    config._module.args.customNixRootPath = customNixRootPath;
   };
 
 in

src/nix/service-host-store.nix

@@ -4,7 +4,8 @@
    when the service.useHostStore option is set to true.
 
  */
-{ lib, config, pkgs, ... }:
+{ lib, config, pkgs, customNixRootPath, ... }:
+
 let
   inherit (lib) mkOption types mkIf;
 in
@@ -20,8 +21,8 @@ in
     service.image = "arion-base";
     service.build.context = "${../arion-image}";
     service.volumes = [
-      "/nix/store:/nix/store"
-      "${pkgs.buildEnv { name = "container-system-env"; paths = [ pkgs.bashInteractive pkgs.coreutils ]; }}:/run/system"
+      "${customNixRootPath}/nix/store:/nix/store"
+      "${customNixRootPath}${pkgs.buildEnv { name = "container-system-env"; paths = [ pkgs.bashInteractive pkgs.coreutils ]; }}:/run/system"
     ];
   };
 }