1 files changed, 12 insertions, 0 deletions
diff --git a/src/nix/command.hh b/src/nix/command.hh
index 659b724c3..3dad64947 100644
--- a/src/nix/command.hh
+++ b/src/nix/command.hh
@@ -102,6 +102,18 @@ struct SourceExprCommand : virtual Args, EvalCommand, MixFlakeOptions
     {
         return {"defaultPackage"};
     }
+
+    virtual Strings getDefaultFlakeAttrPathPrefixes()
+    {
+        return {
+            // As a convenience, look for the attribute in
+            // 'outputs.packages'.
+            "packages.",
+            // As a temporary hack until Nixpkgs is properly converted
+            // to provide a clean 'packages' set, look in 'legacyPackages'.
+            "legacyPackages."
+        };
+    }
 };
 
 enum RealiseMode { Build, NoBuild, DryRun };