3 files changed, 20 insertions, 7 deletions
diff --git a/modules/options/default.nix b/modules/options/default.nix
index bd831dc..97afab3 100644
--- a/modules/options/default.nix
+++ b/modules/options/default.nix
@@ -1,7 +1,20 @@
 { lib, ... }:
+with lib.options;
+with lib.types;
 {
-  options.modules.nix.extend = lib.options.mkOption {
-    default = true;
-    type = lib.types.bool;
+  options.modules = {
+    nix.extend = mkOption {
+      default = true;
+      type = types.bool;
+    };
+
+    server.containerEngine = mkOption {
+      default = "podman";
+
+      type = types.enum [
+        "podman"
+        "docker"
+      ];
+    };
   };
 }
diff --git a/modules/server/systemd.nix b/modules/server/systemd.nix
index acdcef4..8d0b118 100644
--- a/modules/server/systemd.nix
+++ b/modules/server/systemd.nix
@@ -1,6 +1,6 @@
-{ secrets, ... }:
+{ secrets, config, ... }:
 let
-  containerEngine = "podman";
+  inherit (config.modules.server) containerEngine;
 in
 {
   systemd.services.tailscale-up = {
diff --git a/modules/server/virtualisation.nix b/modules/server/virtualisation.nix
index 3d8effe..0bda69e 100644
--- a/modules/server/virtualisation.nix
+++ b/modules/server/virtualisation.nix
@@ -1,6 +1,6 @@
-{ secrets, ... }:
+{ secrets, config, ... }:
 let
-  containerEngine = "podman";
+  inherit (config.modules.server) containerEngine;
 in
 {
   virtualisation = {