* Maintain a database table (`derivers') that maps output paths to the

  derivation that produced them.
* `nix-store -qd PATH' prints out the derivation that produced a path.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 881f2dac8899..64443d41a785 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -1140,7 +1140,8 @@ void DerivationGoal::computeClosure()
     {
         registerValidPath(txn, i->second.path,
             contentHashes[i->second.path],
-            allReferences[i->second.path]);
+            allReferences[i->second.path],
+            drvPath);
     }
     txn.commit();
 
@@ -1501,7 +1502,7 @@ void SubstitutionGoal::finished()
 
     Transaction txn;
     createStoreTransaction(txn);
-    registerValidPath(txn, storePath, contentHash, references);
+    registerValidPath(txn, storePath, contentHash, references, "");
     txn.commit();
 
     outputLock->setDeletion(true);