_389-ds-base: use cargoSetupHook and remove hard-coded vendor path

This was not previously not using cargoSetupHook and therefore had a faulty configuration when building subpackages with vendored packages. This fixes that and removes a hard-coded vendor path from the source cargo config which was interfering with the generated configuration.

pkgs/by-name/_3/_389-ds-base/0001-remove-hard-coded-vendor-paths.patch

@@ -0,0 +1,26 @@
+From 815bf49134f9dc049080b0ec4eb2fd807c23086b Mon Sep 17 00:00:00 2001
+From: azban <me@azban.net>
+Date: Mon, 6 Apr 2026 19:49:19 -0600
+Subject: [PATCH 1/2] remove hard-coded vendor paths
+
+Hard-coded vendored sources is not compatible with fetchCargoVendor.
+
+Signed-off-by: azban <me@azban.net>
+---
+ .cargo/config.toml.in | 6 ------
+ 1 file changed, 6 deletions(-)
+
+diff --git a/.cargo/config.toml.in b/.cargo/config.toml.in
+index d7d8ff4d4..e69de29bb 100644
+--- a/.cargo/config.toml.in
++++ b/.cargo/config.toml.in
+@@ -1,6 +0,0 @@
+-[source.crates-io]
+-registry = "https://github.com/rust-lang/crates.io-index"
+-@rust_vendor_sources@
+-
+-[source.vendored-sources]
+-directory = "./vendor"
+-- 
+2.51.2
+

pkgs/by-name/_3/_389-ds-base/package.nix

@@ -57,11 +57,13 @@ stdenv.mkDerivation (finalAttrs: {
       url = "https://github.com/389ds/389-ds-base/commit/1701419551c246e9dc21778b118220eeb2258125.patch";
       hash = "sha256-trzY/fDH3rs66DWbWI+PY46tIC9ShuVqspMHqEEKZYA=";
     })
+    ./0001-remove-hard-coded-vendor-paths.patch
   ];
 
+  cargoRoot = "src";
+
   cargoDeps = rustPlatform.fetchCargoVendor {
-    inherit (finalAttrs) src;
-    sourceRoot = "${finalAttrs.src.name}/src";
+    inherit (finalAttrs) src cargoRoot;
     name = "389-ds-base-${finalAttrs.version}";
     hash = "sha256-pNzMQjeBpmzFg6oWCxhLDmKGUKIW6jGmZQWai5Yunjc=";
   };
@@ -74,6 +76,7 @@ stdenv.mkDerivation (finalAttrs: {
     python3
     cargo
     rustc
+    rustPlatform.cargoSetupHook
   ]
   ++ lib.optional withCockpit rsync;
 
@@ -106,10 +109,6 @@ stdenv.mkDerivation (finalAttrs: {
     ./autogen.sh --prefix="$out"
   '';
 
-  preBuild = ''
-    ln -s ${finalAttrs.cargoDeps} ./vendor
-  '';
-
   configureFlags = [
     "--enable-rust-offline"
     "--enable-autobind"