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-rw-r--r--third_party/nix/src/libstore/derivations.hh4
1 files changed, 4 insertions, 0 deletions
diff --git a/third_party/nix/src/libstore/derivations.hh b/third_party/nix/src/libstore/derivations.hh
index cbfea20503..3e26d5fa6f 100644
--- a/third_party/nix/src/libstore/derivations.hh
+++ b/third_party/nix/src/libstore/derivations.hh
@@ -35,6 +35,8 @@ struct DerivationOutput {
         hash(proto_derivation_output.hash()) {}
 
   void parseHashInfo(bool& recursive, Hash& hash) const;
+
+  [[nodiscard]] nix::proto::Derivation_DerivationOutput to_proto() const;
 };
 
 // TODO(tazjin): Determine whether this actually needs to be ordered.
@@ -61,6 +63,8 @@ struct BasicDerivation {
   static BasicDerivation from_proto(
       const nix::proto::Derivation* proto_derivation, const nix::Store& store);
 
+  [[nodiscard]] nix::proto::Derivation to_proto() const;
+
   virtual ~BasicDerivation(){};
 
   /* Return the path corresponding to the output identifier `id' in