From fce89f4c954869290d2cf179b1540776ea329ebc Mon Sep 17 00:00:00 2001
From: Zhaofeng Li <hello@zhaofeng.li>
Date: Mon, 6 Feb 2023 19:39:10 -0700
Subject: [PATCH] attic/nix_store: Only initialize Nix once

---
 attic/src/nix_store/bindings/nix.cpp | 11 ++++++++++-
 attic/src/nix_store/bindings/nix.hpp |  1 +
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/attic/src/nix_store/bindings/nix.cpp b/attic/src/nix_store/bindings/nix.cpp
index 40597c1..55367c0 100644
--- a/attic/src/nix_store/bindings/nix.cpp
+++ b/attic/src/nix_store/bindings/nix.cpp
@@ -10,6 +10,9 @@
 
 #include "attic/src/nix_store/bindings/nix.hpp"
 
+static std::mutex g_init_nix_mutex;
+static bool g_init_nix_done = false;
+
 static nix::StorePath store_path_from_rust(RBasePathSlice base_name) {
 	std::string_view sv((const char *)base_name.data(), base_name.size());
 	return nix::StorePath(sv);
@@ -76,7 +79,13 @@ RString CPathInfo::ca() {
 
 CNixStore::CNixStore() {
 	std::map<std::string, std::string> params;
-	nix::initNix();
+	std::lock_guard<std::mutex> lock(g_init_nix_mutex);
+
+	if (!g_init_nix_done) {
+		nix::initNix();
+		g_init_nix_done = true;
+	}
+
 	this->store = nix::openStore("auto", params);
 }
 
diff --git a/attic/src/nix_store/bindings/nix.hpp b/attic/src/nix_store/bindings/nix.hpp
index 8f50b1f..70d79cd 100644
--- a/attic/src/nix_store/bindings/nix.hpp
+++ b/attic/src/nix_store/bindings/nix.hpp
@@ -11,6 +11,7 @@
 #pragma once
 #include <iostream>
 #include <memory>
+#include <mutex>
 #include <set>
 #include <nix/store-api.hh>
 #include <nix/local-store.hh>