From f2280749b1d58a56f91ad417b487e920ab23b8b6 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Wed, 27 Oct 2021 14:21:31 +0200
Subject: [PATCH] If max-jobs == 0, do preferLocalBuild on remote builders

---
 src/libstore/build/derivation-goal.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/libstore/build/derivation-goal.cc b/src/libstore/build/derivation-goal.cc
index 67cf8b067..b924d23b2 100644
--- a/src/libstore/build/derivation-goal.cc
+++ b/src/libstore/build/derivation-goal.cc
@@ -616,7 +616,9 @@ void DerivationGoal::tryToBuild()
     /* Don't do a remote build if the derivation has the attribute
        `preferLocalBuild' set.  Also, check and repair modes are only
        supported for local builds. */
-    bool buildLocally = buildMode != bmNormal || parsedDrv->willBuildLocally(worker.store);
+    bool buildLocally =
+        (buildMode != bmNormal || parsedDrv->willBuildLocally(worker.store))
+        && settings.maxBuildJobs.get() != 0;
 
     if (!buildLocally) {
         switch (tryBuildHook()) {