From 62bf33a9c670a7cc9273d35fc52c8f0d5a0b115b Mon Sep 17 00:00:00 2001
From: bjorn3 <17426603+bjorn3@users.noreply.github.com>
Date: Sat, 14 Oct 2023 12:41:44 +0000
Subject: [PATCH] Ensure we don't overwrite an existing Cargo.lock when
 fetching an external git repo

---
 build_system/prepare.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/build_system/prepare.rs b/build_system/prepare.rs
index 16e7a4bafae..c68968b4fde 100644
--- a/build_system/prepare.rs
+++ b/build_system/prepare.rs
@@ -143,6 +143,7 @@ impl GitRepo {
             RelPath::PATCHES.to_path(dirs).join(format!("{}-lock.toml", self.patch_name));
         let target_lockfile = download_dir.join("Cargo.lock");
         if source_lockfile.exists() {
+            assert!(!target_lockfile.exists());
             fs::copy(source_lockfile, target_lockfile).unwrap();
         } else {
             assert!(target_lockfile.exists());