Merge remote-tracking branch 'tweag/automatedUpdate' into flakes

1 files changed, 6 insertions, 0 deletions

diff --git a/src/nix/command.hh b/src/nix/command.hh
index 56e1e6f34..a5ae56fb9 100644
--- a/src/nix/command.hh
+++ b/src/nix/command.hh
@@ -3,6 +3,7 @@
 #include "args.hh"
 #include "primops/flake.hh"
 #include "common-eval-args.hh"
+#include <optional>
 
 namespace nix {
 
@@ -66,6 +67,11 @@ struct Installable
 
     Buildable toBuildable();
 
+    virtual std::optional<std::string> installableToFlakeUri()
+    {
+        return std::nullopt;
+    }
+
     virtual Value * toValue(EvalState & state)
     {
         throw Error("argument '%s' cannot be evaluated", what());