doc: use `gitignoreSource`

Running `make -C doc` to build the manual locally leaves .xml artifacts
in the tree. These are ignored by git, but they still get included in
the build when not using flakes, which causes the corresponding chapters
not to be built.

1 files changed, 1 insertions, 2 deletions

diff --git a/doc/default.nix b/doc/default.nix
index 1d5fa4811a3..ac405c37903 100644
--- a/doc/default.nix
+++ b/doc/default.nix
@@ -1,6 +1,5 @@
 { pkgs ? (import ./.. { }), nixpkgs ? { }}:
 let
-  lib = pkgs.lib;
   doc-support = import ./doc-support { inherit pkgs nixpkgs; };
 in pkgs.stdenv.mkDerivation {
   name = "nixpkgs-manual";
@@ -15,7 +14,7 @@ in pkgs.stdenv.mkDerivation {
     xmlformat
   ];
 
-  src = lib.cleanSource ./.;
+  src = pkgs.nix-gitignore.gitignoreSource [] ./.;
 
   postPatch = ''
     ln -s ${doc-support} ./doc-support/result