Don't create unnecessary substitution goals for derivations

NixOS · Nov 24, 2014 · 9e3389c · 9e3389c
1 parent 2157454
commit 9e3389c
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
@@ -924,6 +924,11 @@ 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;