Install yaml2nix.

nix/configuration/configuration.nix

@@ -55,6 +55,7 @@
     ./roles/network
     ./roles/nix_index
     ./roles/nix_worker
+    ./roles/nixdev
     ./roles/nvme
     ./roles/openpgp_card_tools
     ./roles/optimized_build

nix/configuration/hosts/odo/default.nix

@@ -114,6 +114,7 @@
     me.memtest.enable = true;
     me.network.enable = true;
     me.nix_index.enable = true;
+    me.nixdev.enable = true;
     me.nvme.enable = true;
     me.openpgp_card_tools.enable = true;
     me.pcsx2.enable = true;

nix/configuration/hosts/odowork/default.nix

@@ -115,6 +115,7 @@
     me.memtest.enable = true;
     me.network.enable = true;
     me.nix_index.enable = true;
+    me.nixdev.enable = true;
     me.nvme.enable = true;
     me.openpgp_card_tools.enable = true;
     me.podman.enable = true;

nix/configuration/hosts/quark/default.nix

@@ -109,6 +109,7 @@
     me.network.enable = true;
     me.nix_index.enable = true;
     me.nix_worker.enable = true;
+    me.nixdev.enable = true;
     me.nvme.enable = true;
     me.openpgp_card_tools.enable = true;
     me.pcsx2.enable = true;

nix/configuration/roles/nixdev/default.nix

@@ -0,0 +1,25 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+{
+  imports = [ ];
+
+  options.me = {
+    nixdev.enable = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      example = true;
+      description = "Whether we want to install nixdev.";
+    };
+  };
+
+  config = lib.mkIf config.me.nixdev.enable {
+    environment.systemPackages = with pkgs; [
+      yaml2nix
+    ];
+  };
+}