diff --git a/nixosModules/clanCore/vars/generator.nix b/nixosModules/clanCore/vars/generator.nix
index 677295f30..aae8dc22f 100644
--- a/nixosModules/clanCore/vars/generator.nix
+++ b/nixosModules/clanCore/vars/generator.nix
@@ -16,7 +16,7 @@ let
     ;
 
   promptToFile = name: ''
-    cat "$prompts"/${name} > "$out"/${name}
+    cat "$prompts/${name}" > "$out/${name}"
   '';
 
   promptsToFilesScript = concatMapStrings promptToFile;
@@ -25,42 +25,35 @@ let
 in
 {
   finalScript = mkOptionDefault (
-    lib.getExe (
-      pkgs.writeShellApplication {
-        name = "generator-${config.name}";
-        text = ''
-          in="''${in:?}"
-          out="''${out:?}"
-          ${if config.prompts == { } then "" else ''prompts="''${prompts:?}"''}
+    pkgs.writeScript "generator-${config.name}" ''
+      set -eu -o pipefail
 
-          export PATH="${makeBinPath config.runtimeInputs}:${pkgs.coreutils}/bin"
+      export PATH="${makeBinPath config.runtimeInputs}:${pkgs.coreutils}/bin"
 
-          ${optionalString (pkgs.stdenv.hostPlatform.isLinux) ''
-            # prepare sandbox user on platforms where this is supported
-            mkdir -p /etc
+      ${optionalString (pkgs.stdenv.hostPlatform.isLinux) ''
+        # prepare sandbox user on platforms where this is supported
+        mkdir -p /etc
 
-            cat > /etc/group <<EOF
-            root:x:0:
-            nixbld:!:$(id -g):
-            nogroup:x:65534:
-            EOF
+        cat > /etc/group <<EOF
+        root:x:0:
+        nixbld:!:$(id -g):
+        nogroup:x:65534:
+        EOF
 
-            cat > /etc/passwd <<EOF
-            root:x:0:0:Nix build user:/build:/noshell
-            nixbld:x:$(id -u):$(id -g):Nix build user:/build:/noshell
-            nobody:x:65534:65534:Nobody:/:/noshell
-            EOF
+        cat > /etc/passwd <<EOF
+        root:x:0:0:Nix build user:/build:/noshell
+        nixbld:x:$(id -u):$(id -g):Nix build user:/build:/noshell
+        nobody:x:65534:65534:Nobody:/:/noshell
+        EOF
 
-            cat > /etc/hosts <<EOF
-            127.0.0.1 localhost
-            ::1 localhost
-            EOF
-          ''}
-          ${promptsToFilesScript filePromptNames}
-          ${config.script}
-        '';
-      }
-    )
+        cat > /etc/hosts <<EOF
+        127.0.0.1 localhost
+        ::1 localhost
+        EOF
+      ''}
+      ${promptsToFilesScript filePromptNames}
+      ${config.script}
+    ''
   );
 
   files = genAttrs filePromptNames (_name: { });