From 313177129b521e49d2acc7ad884cf798e3a01b4c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dani=C3=ABl=20de=20Kok?= <me@danieldk.eu>
Date: Sat, 20 Mar 2021 08:38:14 +0100
Subject: [PATCH] python3Packages.setuptools-rust: fix passthru test

The build wanted to create a Cargo.lock in the top-level source
directory (presumably because it is also a Cargo project), since we
were crating the lock file in sourceRoot (which was set to the example
project). This failed because the sources are read-only. Change the
test to create the lock file in the top-level crate directory, which
is Cargo's default behavior.
---
 .../python-modules/setuptools-rust/pyo3-test/default.nix    | 6 +++++-
 pkgs/development/tools/rust/maturin/pyo3-test/generic.nix   | 6 +++---
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/pkgs/development/python-modules/setuptools-rust/pyo3-test/default.nix b/pkgs/development/python-modules/setuptools-rust/pyo3-test/default.nix
index 9af17aa5159c..31730d6ff2dc 100644
--- a/pkgs/development/python-modules/setuptools-rust/pyo3-test/default.nix
+++ b/pkgs/development/python-modules/setuptools-rust/pyo3-test/default.nix
@@ -17,5 +17,9 @@ callPackage ../../../tools/rust/maturin/pyo3-test/generic.nix {
     rust.rustc
   ]);
 
-  sourceRoot = "source/examples/word-count";
+  preConfigure = ''
+    # sourceRoot puts Cargo.lock in the wrong place due to the
+    # example setup.
+    cd examples/word-count
+  '';
 }
diff --git a/pkgs/development/tools/rust/maturin/pyo3-test/generic.nix b/pkgs/development/tools/rust/maturin/pyo3-test/generic.nix
index f82c988fc512..84ca2ddf77f6 100644
--- a/pkgs/development/tools/rust/maturin/pyo3-test/generic.nix
+++ b/pkgs/development/tools/rust/maturin/pyo3-test/generic.nix
@@ -10,7 +10,7 @@
 
 , buildAndTestSubdir ? null
 , format ? "pyproject"
-, sourceRoot ? "source"
+, preConfigure ? ""
 }:
 
 python3Packages.buildPythonPackage rec {
@@ -25,14 +25,14 @@ python3Packages.buildPythonPackage rec {
   };
 
   cargoDeps = rustPlatform.fetchCargoTarball {
-    inherit src sourceRoot patches;
+    inherit src patches;
     name = "${pname}-${version}";
     hash = "sha256-//TmozgWy9zrSpMKX92XdHj4fw/T1Elfgn4YhhR7ot0=";
   };
 
   patches = [ ./Cargo.lock.patch ];
 
-  inherit buildAndTestSubdir format nativeBuildInputs sourceRoot;
+  inherit buildAndTestSubdir format nativeBuildInputs preConfigure;
 
   pythonImportsCheck = [ "word_count" ];