Don't create unnecessary substitution goals for derivations

1 files changed, 5 insertions, 0 deletions

diff --git a/nix/libstore/build.cc b/nix/libstore/build.cc
index 17085ad3f7..952dbd2325 100644
--- a/nix/libstore/build.cc
+++ b/nix/libstore/build.cc
@@ -936,6 +936,11 @@ void DerivationGoal::init()
     /* The first thing to do is to make sure that the derivation
        exists.  If it doesn't, it may be created through a
        substitute. */
+    if (buildMode == bmNormal && worker.store.isValidPath(drvPath)) {
+        haveDerivation();
+        return;
+    }
+
     addWaitee(worker.makeSubstitutionGoal(drvPath));
 
     state = &DerivationGoal::haveDerivation;