add docker-native module for native docker support in NixOS

Addresses [#59](https://github.com/nix-community/NixOS-WSL/issues/59#issuecomment-1092657189)
by overlaying legacy iptables on the docker package.

1 files changed, 31 insertions, 0 deletions

diff --git a/modules/docker-native.nix b/modules/docker-native.nix
new file mode 100644
index 0000000..a8396e7
--- /dev/null
+++ b/modules/docker-native.nix
@@ -0,0 +1,31 @@
+{ config, lib, pkgs, ... }:
+with builtins; with lib; {
+
+  options.wsl.docker-native = with types; {
+    enable = mkEnableOption "Native Docker integration in NixOS.";
+  };
+
+  config =
+    let
+      cfg = config.wsl.docker-native;
+    in
+    mkIf (config.wsl.enable && cfg.enable) {
+      nixpkgs.overlays = [
+        (self: super: {
+          docker = super.docker.override { iptables = pkgs.iptables-legacy; };
+        })
+      ];
+
+      environment.systemPackages = with pkgs; [
+        docker
+        docker-compose
+      ];
+
+      virtualisation.docker.enable = true;
+
+      users.groups.docker.members = [
+        config.wsl.defaultUser
+      ];
+    };
+
+}