nix optimise-store: Add

This replaces "nix-store --optimise". Main difference is that it has a
progress indicator.

1 files changed, 41 insertions, 0 deletions

diff --git a/src/nix/optimise-store.cc b/src/nix/optimise-store.cc
new file mode 100644
index 000000000000..725fb75a19ec
--- /dev/null
+++ b/src/nix/optimise-store.cc
@@ -0,0 +1,41 @@
+#include "command.hh"
+#include "shared.hh"
+#include "store-api.hh"
+
+#include <atomic>
+
+using namespace nix;
+
+struct CmdOptimiseStore : StoreCommand
+{
+    CmdOptimiseStore()
+    {
+    }
+
+    std::string name() override
+    {
+        return "optimise-store";
+    }
+
+    std::string description() override
+    {
+        return "replace identical files in the store by hard links";
+    }
+
+    Examples examples() override
+    {
+        return {
+            Example{
+                "To optimise the Nix store:",
+                "nix optimise-store"
+            },
+        };
+    }
+
+    void run(ref<Store> store) override
+    {
+        store->optimiseStore();
+    }
+};
+
+static RegisterCommand r1(make_ref<CmdOptimiseStore>());