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-rw-r--r--src/nix-worker/nix-worker.cc9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/nix-worker/nix-worker.cc b/src/nix-worker/nix-worker.cc
index 078362e9c37b..6ddf01bd017d 100644
--- a/src/nix-worker/nix-worker.cc
+++ b/src/nix-worker/nix-worker.cc
@@ -277,6 +277,15 @@ static void performOp(Source & from, Sink & to, unsigned int op)
         break;
     }
 
+    case wopQueryDeriver: {
+        Path path = readStorePath(from);
+        startWork();
+        Path deriver = store->queryDeriver(path);
+        stopWork();
+        writeString(deriver, to);
+        break;
+    }
+
     case wopAddToStore: {
         /* !!! uberquick hack */
         string baseName = readString(from);