From 453d6b714ecbb28a38bc5c26d85b60ae52eb0227 Mon Sep 17 00:00:00 2001
From: aleksana <me@aleksana.moe>
Date: Wed, 25 Jun 2025 01:18:58 +0800
Subject: [PATCH] rustPlatform.rustVendorSrc: init

This is needed when compiling against rustLibSrc, for example when using
wasm-pack. The upstream Cargo.lock may not include those dependencies.
---
 pkgs/development/compilers/rust/make-rust-platform.nix | 6 ++++++
 pkgs/development/compilers/rust/rust-vendor-src.nix    | 6 ++++++
 2 files changed, 12 insertions(+)
 create mode 100644 pkgs/development/compilers/rust/rust-vendor-src.nix

diff --git a/pkgs/development/compilers/rust/make-rust-platform.nix b/pkgs/development/compilers/rust/make-rust-platform.nix
index 29a7e5f95194..1f69bb92e213 100644
--- a/pkgs/development/compilers/rust/make-rust-platform.nix
+++ b/pkgs/development/compilers/rust/make-rust-platform.nix
@@ -51,6 +51,12 @@
         inherit runCommand rustc;
       };
 
+      # Useful when rebuilding std
+      # e.g. when building wasm with wasm-pack
+      rustVendorSrc = callPackage ./rust-vendor-src.nix {
+        inherit runCommand rustc;
+      };
+
       # Hooks
       inherit
         (callPackages ../../../build-support/rust/hooks {
diff --git a/pkgs/development/compilers/rust/rust-vendor-src.nix b/pkgs/development/compilers/rust/rust-vendor-src.nix
new file mode 100644
index 000000000000..18d9922e1c6c
--- /dev/null
+++ b/pkgs/development/compilers/rust/rust-vendor-src.nix
@@ -0,0 +1,6 @@
+{ runCommand, rustc }:
+
+runCommand "rust-vendor-src" { } ''
+  tar --strip-components=1 -xzf ${rustc.src}
+  mv vendor $out
+''