From 126bd3b578fdeedd9af7887e028dfdfbf4a223dd Mon Sep 17 00:00:00 2001
From: Lily Ballard <lily@ballards.net>
Date: Tue, 14 Apr 2026 21:39:14 -0700
Subject: [PATCH] cargo: disallow references to bootstrap cargo, rustc

cargo recently accidentally gained a runtime dependency on
cargo-bootstrap, we don't want to let that happen again.
---
 pkgs/development/compilers/rust/cargo.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pkgs/development/compilers/rust/cargo.nix b/pkgs/development/compilers/rust/cargo.nix
index 87903ed443d5..3fb4f948a223 100644
--- a/pkgs/development/compilers/rust/cargo.nix
+++ b/pkgs/development/compilers/rust/cargo.nix
@@ -109,6 +109,13 @@ rustPlatform.buildRustPackage.override
       runHook postInstallCheck
     '';
 
+    # Make sure our build rustc/cargo never make it into our runtime closure
+    disallowedReferences = [
+      rustPlatform.rust.cargo
+      rustPlatform.rust.rustc
+      rustPlatform.rust.rustc.unwrapped
+    ];
+
     meta = {
       homepage = "https://crates.io";
       description = "Downloads your Rust project's dependencies and builds your project";