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-rw-r--r--nix/libstore/store-api.hh4
1 files changed, 4 insertions, 0 deletions
diff --git a/nix/libstore/store-api.hh b/nix/libstore/store-api.hh
index b635fee2cf..3109f100ef 100644
--- a/nix/libstore/store-api.hh
+++ b/nix/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;
};