Add a custom no-op cargo test runner

.ci/cargo_glue.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+set -e
+
+# This script is used by cargo to run the test runner with the 
+# specified arguments.
+#
+# We need this script because the cwd that cargo runs the runner in changes
+# depending on crate.
+
+cd "$GITHUB_WORKSPACE/.ci/"
+echo "In glue script with cwd: $(pwd)"
+echo "Got args: $@"

.ci/config.toml

@@ -0,0 +1,8 @@
+[target.x86_64-unknown-linux-gnu]
+# The command to execute instead of the compiled test binary. Cargo will append the
+# actual path to the compiled test executable and any arguments (like --list, --exact,
+# --nocapture) after this command. 
+# We use a tool without a slash in it so cargo will search $PATH.
+#
+# Before calling the `cargo test` we append the location of the glue to the path.
+runner = ["cargo_glue.sh"]

.github/workflows/ci_linux.yml

@@ -138,6 +138,13 @@ jobs:
  - name: RockyLinux-9 / CUDA-12.8.1
  image: "ghcr.io/rust-gpu/rust-cuda-rockylinux9-cuda12:latest"
  steps:
+ - name: Checkout repository
+ uses: actions/checkout@v4
+
+ # random command that forces rustup to install stuff in rust-toolchain
+ - name: Install rust-toolchain
+ run: cargo version
+
  - name: Download build artifacts
  uses: actions/download-artifact@v4
  with:
@@ -152,7 +159,8 @@ jobs:
  MODAL_TOKEN_ID: ${{ secrets.MODAL_TOKEN_ID }}
  MODAL_TOKEN_SECRET: ${{ secrets.MODAL_TOKEN_SECRET }}
  run: |
- echo "Stubbed out"
+ export PATH="$PATH:$GITHUB_WORKSPACE/.ci"
+ cargo --config .ci/config.toml test --workspace --exclude "optix*" --exclude "path_tracer" --exclude "denoiser" --exclude "ex*" --exclude "cudnn*" --exclude "blastoff"
  compiletest:
  name: Compile tests
  runs-on: ubuntu-latest