nix-store -q --roots: Respect the gc-keep-outputs/gc-keep-derivations settings

So if a path is not garbage solely because it's reachable from a root
due to the gc-keep-outputs or gc-keep-derivations settings, ‘nix-store
-q --roots’ now shows that root.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/libstore/remote-store.cc b/src/libstore/remote-store.cc
index c97c5fbf04..8f33b7e5cd 100644
--- a/src/libstore/remote-store.cc
+++ b/src/libstore/remote-store.cc
@@ -334,6 +334,16 @@ Path RemoteStore::queryDeriver(const Path & path)
 }
 
 
+PathSet RemoteStore::queryValidDerivers(const Path & path)
+{
+    openConnection();
+    writeInt(wopQueryValidDerivers, to);
+    writeString(path, to);
+    processStderr();
+    return readStorePaths<PathSet>(from);
+}
+
+
 PathSet RemoteStore::queryDerivationOutputs(const Path & path)
 {
     openConnection();