ci: avoid macOS devenv stalls

Author: domenkozar

.github/workflows/test.yml

@@ -32,8 +32,13 @@ jobs:
     - name: Install devenv.sh
       run: nix profile install nixpkgs#devenv
 
-    - name: Build the devenv shell and run any pre-commit hooks
-      run: devenv test
+    # `devenv test` also starts every configured process. The docs dev server is
+    # unrelated to this suite and makes process-compose wait for its timeout when
+    # docs dependencies are not installed, so run the hooks and tests directly.
+    - name: Run pre-commit hooks
+      run: devenv tasks run devenv:git-hooks:run --show-output
+    - name: Run tests
+      run: devenv shell -- cargo test --all
 
   # Windows runners can't run Nix/devenv, so the suite runs here natively via
   # rustup + cargo. This exists specifically to catch Windows-only path handling

devenv.nix

@@ -1,4 +1,4 @@
-{ pkgs, ... }: {
+{ lib, pkgs, ... }: {
   languages.rust = {
     enable = true;
     # The Rust version is pinned in rust-toolchain.toml, which the native CI
@@ -69,6 +69,8 @@
   ];
 
   # Fully-static musl build of the Go SDK (-tags static + -extldflags -static).
+  # Keep these Linux-only: interpolating the cross-toolchain paths on macOS makes
+  # Nix build a Linux-targeting GCC toolchain from source just to enter the shell.
   # The musl C cross-toolchain and static libdbus/libunwind are referenced HERE by
   # absolute path only -- NOT added to `packages`, because devenv `packages` inject
   # their lib dirs into the host NIX_LDFLAGS, which would make the ordinary glibc
@@ -77,7 +79,7 @@
   # the host build environment. The CC_/linker vars are musl-target-scoped, so host
   # (glibc) cargo builds are unaffected; MUSL_CC / MUSL_STATIC_LDFLAGS feed the cgo
   # step so the final binary statically links libdbus + libunwind.
-  env =
+  env = lib.optionalAttrs pkgs.stdenv.isLinux (
     let
       muslcc = "${pkgs.pkgsCross.musl64.stdenv.cc}/bin/x86_64-unknown-linux-musl-gcc";
     in
@@ -86,7 +88,8 @@
       CARGO_TARGET_X86_64_UNKNOWN_LINUX_MUSL_LINKER = muslcc;
       MUSL_CC = muslcc;
       MUSL_STATIC_LDFLAGS = "-L${pkgs.pkgsStatic.dbus.lib}/lib -L${pkgs.pkgsStatic.libunwind}/lib";
-    };
+    }
+  );
 
   git-hooks.hooks = {
     rustfmt.enable = true;