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-rw-r--r--src/libstore/store-api.hh4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index b635fee2cf1a..3109f100ef93 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -250,6 +250,10 @@ public:
        `nix-store --register-validity'. */
     string makeValidityRegistration(const PathSet & paths,
         bool showDerivers, bool showHash);
+
+    /* Optimise the disk space usage of the Nix store by hard-linking files
+       with the same contents. */
+    virtual void optimiseStore() = 0;
 };