From 656e3022f4caa11905bad996866bf07b848afc0b Mon Sep 17 00:00:00 2001
From: linsui <linsui555@gmail.com>
Date: Sun, 26 Jun 2022 13:05:18 +0800
Subject: [PATCH] fetch-cargo-tarball: allow use index mirror

---
 .../rust/fetch-cargo-tarball/default.nix            | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/pkgs/build-support/rust/fetch-cargo-tarball/default.nix b/pkgs/build-support/rust/fetch-cargo-tarball/default.nix
index 2f1f3547dbb0..e2ee870f22a3 100644
--- a/pkgs/build-support/rust/fetch-cargo-tarball/default.nix
+++ b/pkgs/build-support/rust/fetch-cargo-tarball/default.nix
@@ -58,9 +58,18 @@ in stdenv.mkDerivation ({
     export CARGO_HOME=$(mktemp -d cargo-home.XXX)
     CARGO_CONFIG=$(mktemp cargo-config.XXXX)
 
+    if [[ -n "$NIX_CRATES_INDEX" ]]; then
+    cat >$CARGO_HOME/config.toml <<EOF
+    [source.crates-io]
+    replace-with = 'mirror'
+    [source.mirror]
+    registry = "$NIX_CRATES_INDEX"
+    EOF
+    fi
+
     ${cargoUpdateHook}
 
-    cargo vendor $name | cargo-vendor-normalise > $CARGO_CONFIG
+    cargo vendor $name --respect-source-config | cargo-vendor-normalise > $CARGO_CONFIG
 
     # Add the Cargo.lock to allow hash invalidation
     cp Cargo.lock.orig $name/Cargo.lock
@@ -81,7 +90,7 @@ in stdenv.mkDerivation ({
 
   inherit (hash_) outputHashAlgo outputHash;
 
-  impureEnvVars = lib.fetchers.proxyImpureEnvVars;
+  impureEnvVars = lib.fetchers.proxyImpureEnvVars ++ [ "NIX_CRATES_INDEX" ];
 } // (builtins.removeAttrs args [
   "name" "sha256" "cargoUpdateHook" "nativeBuildInputs"
 ]))