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-rw-r--r--nix/libstore/local-store.hh5
1 files changed, 4 insertions, 1 deletions
diff --git a/nix/libstore/local-store.hh b/nix/libstore/local-store.hh
index 57d15bac7e..9ba37219da 100644
--- a/nix/libstore/local-store.hh
+++ b/nix/libstore/local-store.hh
@@ -42,7 +42,10 @@ class LocalStore : public StoreAPI
 {
 private:
     /* The currently running substituter or empty.  */
-    std::unique_ptr<Agent> runningSubstituter;
+    std::shared_ptr<Agent> runningSubstituter;
+
+    /* Ensure the substituter is running and return it.  */
+    std::shared_ptr<Agent> substituter();
 
     Path linksDir;