From 626ccd7121adad49e605f310cb5e557fc5265c57 Mon Sep 17 00:00:00 2001
From: Atkins <atkins@fstk.io>
Date: Fri, 26 Jul 2019 00:48:18 +0800
Subject: [PATCH] buildRustPackage: Avoid altering `.cargo/config` in source

---
 pkgs/build-support/rust/default.nix | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/pkgs/build-support/rust/default.nix b/pkgs/build-support/rust/default.nix
index 762a61b8a57..94873c32a4e 100644
--- a/pkgs/build-support/rust/default.nix
+++ b/pkgs/build-support/rust/default.nix
@@ -72,14 +72,6 @@ in stdenv.mkDerivation (args // {
     substitute $config .cargo/config \
       --subst-var-by vendor "$(pwd)/$cargoDepsCopy"
 
-    unset cargoDepsCopy
-
-    export RUST_LOG=${logLevel}
-  '' + (args.postUnpack or "");
-
-  configurePhase = args.configurePhase or ''
-    runHook preConfigure
-    mkdir -p .cargo
     cat >> .cargo/config <<'EOF'
     [target."${stdenv.buildPlatform.config}"]
     "linker" = "${ccForBuild}"
@@ -89,6 +81,13 @@ in stdenv.mkDerivation (args // {
     ''}
     EOF
     cat .cargo/config
+
+    unset cargoDepsCopy
+    export RUST_LOG=${logLevel}
+  '' + (args.postUnpack or "");
+
+  configurePhase = args.configurePhase or ''
+    runHook preConfigure
     runHook postConfigure
   '';