* New query `nix --query --predecessors' to print the predecessors of

  a Nix expression.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/store.cc b/src/store.cc
index 6953207131..3e755a0d1a 100644
--- a/src/store.cc
+++ b/src/store.cc
@@ -104,6 +104,14 @@ void registerSuccessor(const Transaction & txn,
 }
 
 
+Paths queryPredecessors(const Path & sucPath)
+{
+    Paths revs;
+    nixDB.queryStrings(noTxn, dbSuccessorsRev, sucPath, revs);
+    return revs;
+}
+
+
 void registerSubstitute(const Path & srcPath, const Path & subPath)
 {
     Transaction txn(nixDB);