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-rw-r--r--third_party/nix/src/proto/worker.proto4
1 files changed, 4 insertions, 0 deletions
diff --git a/third_party/nix/src/proto/worker.proto b/third_party/nix/src/proto/worker.proto
index d3e8f65f200d..ad1810b4d569 100644
--- a/third_party/nix/src/proto/worker.proto
+++ b/third_party/nix/src/proto/worker.proto
@@ -78,6 +78,10 @@ service Worker {
   // Return all currently valid derivations that have the given store path as an
   // output.
   rpc QueryValidDerivers(StorePath) returns (StorePaths);
+
+  // Optimise the disk space usage of the Nix store by hard-linking files
+  // with the same contents.
+  rpc OptimiseStore(google.protobuf.Empty) returns (google.protobuf.Empty);
 }
 
 enum HashType {