Add basic integration tests for forward compat

Signed-off-by: Evan Lezar <[email protected]>

Author: elezar

tests/e2e/nvidia-container-toolkit_test.go

@@ -160,4 +160,30 @@ var _ = Describe("docker", Ordered, func() {
 			Expect(referenceOutput).To(Equal(out4))
 		})
 	})
+
+	Describe("CUDA Forward compatibility", Ordered, func() {
+		BeforeAll(func(ctx context.Context) {
+			_, _, err := r.Run("docker pull nvcr.io/nvidia/cuda:12.8.0-base-ubi8")
+			Expect(err).ToNot(HaveOccurred())
+		})
+
+		It("should use the CUDA compat libs in legacy mode", func(ctx context.Context) {
+			ldconfigOut, _, err := r.Run("docker run --rm -i -e NVIDIA_DISABLE_REQUIRE=true --runtime=nvidia --gpus all nvcr.io/nvidia/cuda:12.8.0-base-ubi8 bash -c \"ldconfig -p | grep libcuda.so.1\"")
+			Expect(err).ToNot(HaveOccurred())
+			Expect(ldconfigOut).To(ContainSubstring("/usr/local/cuda/compat"))
+		})
+
+		It("should use the CUDA compat libs in CDI mode", func(ctx context.Context) {
+			ldconfigOut, _, err := r.Run("docker run --rm -i -e NVIDIA_DISABLE_REQUIRE=true  --runtime=nvidia -e NVIDIA_VISIBLE_DEVICES=runtime.nvidia.com/gpu=all nvcr.io/nvidia/cuda:12.8.0-base-ubi8 bash -c \"ldconfig -p | grep libcuda.so.1\"")
+			Expect(err).ToNot(HaveOccurred())
+			Expect(ldconfigOut).To(ContainSubstring("/usr/local/cuda/compat"))
+		})
+
+		It("should use the CUDA compat libs when using the nvidia-container-runtime-hook", func(ctx context.Context) {
+			ldconfigOut, _, err := r.Run("docker run --rm -i -e NVIDIA_DISABLE_REQUIRE=true --runtime=runc --gpus all nvcr.io/nvidia/cuda:12.8.0-base-ubi8 bash -c \"ldconfig -p | grep libcuda.so.1\"")
+			Expect(err).ToNot(HaveOccurred())
+			Expect(ldconfigOut).To(ContainSubstring("/usr/local/cuda/compat"))
+		})
+
+	})
 })