From 6b6ceddf72979d8cd29aa79863f212818ff46385 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Mon, 2 Jun 2025 11:41:02 +0200
Subject: [PATCH] nix store copy-sigs: Use http-connections setting to control
 parallelism

Previously it used the `ThreadPool` default,
i.e. `std::thread::hardware_concurrency()`. But copying signatures is
not primarily CPU-bound so it makes more sense to use the
`http-connections` setting (since we're typically copying from/to a
binary cache).
---
 src/nix/sigs.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/nix/sigs.cc b/src/nix/sigs.cc
index 142421e9c..b5ad0c133 100644
--- a/src/nix/sigs.cc
+++ b/src/nix/sigs.cc
@@ -3,6 +3,7 @@
 #include "nix/main/shared.hh"
 #include "nix/store/store-open.hh"
 #include "nix/util/thread-pool.hh"
+#include "nix/store/filetransfer.hh"
 
 #include <atomic>
 
@@ -38,7 +39,7 @@ struct CmdCopySigs : StorePathsCommand
         for (auto & s : substituterUris)
             substituters.push_back(openStore(s));
 
-        ThreadPool pool;
+        ThreadPool pool{fileTransferSettings.httpConnections};
 
         std::atomic<size_t> added{0};