From 8ef6315702277af0ca224e111ee2e27d1305f3ad Mon Sep 17 00:00:00 2001
From: Tamas Vajk <tamas.vajk@databricks.com>
Date: Tue, 28 Apr 2026 13:58:13 +0000
Subject: [PATCH] Pass --respect-source-config to cargo vendor

Without this flag, `cargo vendor` ignores [source] replacement
configured in .cargo/config.toml, causing it to bypass registry
proxies and connect directly to index.crates.io. This breaks
vendoring in environments that require a proxy (e.g. air-gapped
networks, corporate firewalls).
---
 crate_universe/src/metadata.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/crate_universe/src/metadata.rs b/crate_universe/src/metadata.rs
index 5a5f673976..e30315f383 100644
--- a/crate_universe/src/metadata.rs
+++ b/crate_universe/src/metadata.rs
@@ -256,6 +256,10 @@ impl VendorGenerator {
             .arg("--locked")
             .arg("--versioned-dirs")
             .arg(output_dir)
+            // Without this flag `cargo vendor` ignores `[source]` replacement
+            // in `.cargo/config.toml`, so it bypasses any configured registry
+            // proxy and connects directly to index.crates.io.
+            .arg("--respect-source-config")
             .env("RUSTC", &self.rustc_bin)
             .output()
             .with_context(|| {