From 1066fb7d44f1063d45937203f8c6b10431d5ba96 Mon Sep 17 00:00:00 2001
From: Yuxuan Shui <yshuiv7@gmail.com>
Date: Wed, 7 Aug 2024 15:52:48 +0100
Subject: [PATCH] don't fetch from store to store

---
 src/libfetchers/fetch-to-store.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/libfetchers/fetch-to-store.cc b/src/libfetchers/fetch-to-store.cc
index 65aa72a6c36a..0c55a1d2ac78 100644
--- a/src/libfetchers/fetch-to-store.cc
+++ b/src/libfetchers/fetch-to-store.cc
@@ -15,6 +15,9 @@ StorePath fetchToStore(
 {
     // FIXME: add an optimisation for the case where the accessor is
     // a `PosixSourceAccessor` pointing to a store path.
+    if (store.isInStore(path.path.abs())) {
+        return store.toStorePath(path.path.abs()).first;
+    }
 
     std::optional<fetchers::Cache::Key> cacheKey;