From 7f08e0ca6d029a0b54ba124f01da8731af68a74e Mon Sep 17 00:00:00 2001
From: Profpatsch <mail@profpatsch.de>
Date: Tue, 22 Mar 2022 22:36:59 +0100
Subject: [PATCH] haskellPackages.hoogleLocal: build database locally

---
 pkgs/development/haskell-modules/hoogle.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pkgs/development/haskell-modules/hoogle.nix b/pkgs/development/haskell-modules/hoogle.nix
index 0b3f71995c99..8518a5391de7 100644
--- a/pkgs/development/haskell-modules/hoogle.nix
+++ b/pkgs/development/haskell-modules/hoogle.nix
@@ -46,6 +46,13 @@ buildPackages.stdenv.mkDerivation {
   name = "hoogle-with-packages";
   buildInputs = [ghc hoogle];
 
+  # compiling databases takes less time than copying the results
+  # between machines.
+  preferLocalBuild = true;
+  # Plus, you need a complete database for each possible combination
+  # of dependencies, caching them does not make sense.
+  allowSubstitutes = false;
+
   inherit docPackages;
 
   passAsFile = ["buildCommand"];