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

  a Nix expression.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/store.hh b/src/store.hh
index abf874543164..7851b1e3d874 100644
--- a/src/store.hh
+++ b/src/store.hh
@@ -22,6 +22,10 @@ void copyPath(const Path & src, const Path & dst);
 void registerSuccessor(const Transaction & txn,
     const Path & srcPath, const Path & sucPath);
 
+/* Return the predecessors of the Nix expression stored at the given
+   path. */
+Paths queryPredecessors(const Path & sucPath);
+
 /* Register a substitute. */
 void registerSubstitute(const Path & srcPath, const Path & subPath);