From 3da97e2163d090fbf03929971357a6757dc44037 Mon Sep 17 00:00:00 2001
From: Silvan Mosberger <silvan.mosberger@tweag.io>
Date: Fri, 14 Jun 2024 20:33:43 +0200
Subject: [PATCH] doc: Prevent unnecessary rebuilds

Especially when only Nix files are changed
---
 doc/default.nix | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/doc/default.nix b/doc/default.nix
index 369220dcc536..fd623cf15b8c 100644
--- a/doc/default.nix
+++ b/doc/default.nix
@@ -2,6 +2,7 @@
 let
   inherit (pkgs) lib;
   inherit (lib) hasPrefix removePrefix;
+  fs = lib.fileset;
 
   common = import ./common.nix;
 
@@ -99,7 +100,19 @@ in pkgs.stdenv.mkDerivation {
     nixos-render-docs
   ];
 
-  src = ./.;
+  src = fs.toSource {
+    root = ./.;
+    fileset = fs.unions [
+      (fs.fileFilter (file:
+        file.hasExt "md"
+        || file.hasExt "md.in"
+      ) ./.)
+      ./style.css
+      ./anchor-use.js
+      ./anchor.min.js
+      ./manpage-urls.json
+    ];
+  };
 
   postPatch = ''
     ln -s ${optionsDoc.optionsJSON}/share/doc/nixos/options.json ./config-options.json