Install d2.

nix/configuration/configuration.nix

@@ -16,6 +16,7 @@
     ./roles/boot
     ./roles/chromecast
     ./roles/chromium
+    ./roles/d2
     ./roles/direnv
     ./roles/distributed_build
     ./roles/docker

nix/configuration/hosts/odo/default.nix

@@ -65,6 +65,7 @@
   me.bluetooth.enable = true;
   me.chromecast.enable = true;
   me.chromium.enable = true;
+  me.d2.enable = true;
   me.direnv.enable = true;
   me.docker.enable = true;
   me.ecc.enable = false;

nix/configuration/hosts/quark/default.nix

@@ -60,6 +60,7 @@
     me.bluetooth.enable = true;
     me.chromecast.enable = true;
     me.chromium.enable = true;
+    me.d2.enable = true;
     me.direnv.enable = true;
     me.docker.enable = true;
     me.ecc.enable = true;

nix/configuration/roles/d2/default.nix

@@ -0,0 +1,29 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+{
+  imports = [ ];
+
+  options.me = {
+    d2.enable = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      example = true;
+      description = "Whether we want to install d2.";
+    };
+  };
+
+  config = lib.mkIf config.me.d2.enable (
+    lib.mkMerge [
+      {
+        environment.systemPackages = with pkgs; [
+          d2
+        ];
+      }
+    ]
+  );
+}