feat: Expose module for setting up the build and test environment.

nci.nix

@@ -11,33 +11,12 @@
       nci.projects.nix-bindings = {
         path = ./.;
         drvConfig = {
+          imports = [
+            # Downstream projects import this into depsDrvConfig instead
+            config.nix-bindings-rust.nciBuildConfig
+          ];
+          # Extra settings for running the tests
           mkDerivation = {
-            buildInputs = [
-              # stdbool.h
-              pkgs.stdenv.cc
-            ]
-            ++ (
-              if config.packages.nix ? libs then
-                let
-                  l = config.packages.nix.libs;
-                in
-                [
-                  l.nix-expr-c
-                  l.nix-store-c
-                  l.nix-util-c
-                  l.nix-flake-c
-                ]
-              else
-                [ config.packages.nix ]
-            );
-            nativeBuildInputs = [
-              pkgs.pkg-config
-            ];
-            # bindgen uses clang to generate bindings, but it doesn't know where to
-            # find our stdenv cc's headers, so when it's gcc, we need to tell it.
-            postConfigure = lib.optionalString pkgs.stdenv.cc.isGNU ''
-              source ${./bindgen-gcc.sh}
-            '';
             # Prepare the environment for Nix to work.
             # Nix does not provide a suitable environment for running itself in
             # the sandbox - not by default. We configure it to use a relocated store.
@@ -61,26 +40,11 @@
               echo "experimental-features = ca-derivations flakes" > "$NIX_CONF_DIR/nix.conf"
 
               # Init ahead of time, because concurrent initialization is flaky
-              ${
-                # Not using nativeBuildInputs because this should (hopefully) be
-                # the only place where we need a nix binary. Let's stay in control.
-                pkgs.buildPackages.nix
-              }/bin/nix-store --init
+              ${config.nix-bindings-rust.nixPackage}/bin/nix-store --init
 
               echo "Store initialized."
             '';
           };
-          # NOTE: duplicated in flake.nix devShell
-          env = {
-            LIBCLANG_PATH = lib.makeLibraryPath [ pkgs.buildPackages.llvmPackages.clang-unwrapped ];
-            BINDGEN_EXTRA_CLANG_ARGS =
-              # Work around missing [[deprecated]] in clang
-              "-x c++ -std=c++2a";
-          }
-          // lib.optionalAttrs pkgs.stdenv.cc.isGNU {
-            # Avoid cc wrapper, because we only need to add the compiler/"system" dirs
-            NIX_CC_UNWRAPPED = "${pkgs.stdenv.cc.cc}/bin/gcc";
-          };
         };
       };
     };