sync

configurations.nix

@@ -14,6 +14,10 @@ let
     # make flake inputs accessiable in NixOS
     { _module.args.inputs = inputs; }
     {
+    _module.args = {
+    utils = import ./utils { inherit pkgs; };
+    
+  };
       imports = [
         ({ pkgs, ... }: {
           nix.nixPath = [

utils/default.nix

@@ -0,0 +1,25 @@
+{ pkgs, ... }: {
+  renderMustache = name: template: data:
+    # Render handlebars `template` called `name` by converting `data` to JSON
+    pkgs.stdenv.mkDerivation {
+
+      name = "${name}";
+
+      # Disable phases which are not needed. In particular the unpackPhase will
+      # fail, if no src attribute is set
+      nativeBuildInpts = [ pkgs.mustache-go ];
+
+      # Pass Json as file to avoid escaping
+      passAsFile = [ "jsonData" ];
+      jsonData = builtins.toJSON data;
+
+      phases = [ "buildPhase" "installPhase" ];
+
+      buildPhase = ''
+        ${pkgs.mustache-go}/bin/mustache $jsonDataPath ${template} > rendered_file
+      '';
+      installPhase = ''
+        cp rendered_file $out
+      '';
+    };
+}