src/cmd/cos_gpu_installer/internal/installer/installer_test.go

package installer

import (
	"archive/tar"
	"bytes"
	"context"
	"fmt"
	"os"
	"path"
	"path/filepath"
	"sort"
	"testing"

	"cos.googlesource.com/cos/tools.git/src/pkg/cos"
	"cos.googlesource.com/cos/tools.git/src/pkg/fakes"
	"cos.googlesource.com/cos/tools.git/src/pkg/gpuconfig/pb"
	"github.com/golang/protobuf/proto"
	"github.com/google/go-cmp/cmp"
)

func TestDownloadGPUDriverVersionsProto(t *testing.T) {
	fakeGCS := fakes.GCSForTest(t)
	fakeBucket := "cos-tools"
	fakePrefix := "10000.00.00/lakitu"
	fakeGCSClient := fakeGCS.Client
	ctx := context.Background()
	var gpuDriverProtoBin = "gpu_driver_versions.bin"
	var mockData = &pb.GPUDriverVersionInfoList{
		GpuDriverVersionInfo: []*pb.GPUDriverVersionInfo{
			{
				GpuDevice: &pb.GPUDevice{
					GpuType: "NVIDIA_TESLA_V100",
				},
				SupportedDriverVersions: []*pb.DriverVersion{
					{
						Label:   "DEFAULT",
						Version: "535.154.05",
					},
					{
						Label:   "LATEST",
						Version: "535.154.05",
					},
					{
						Label:   "R535",
						Version: "535.154.05",
					},
					{
						Version: "535.129.03",
					},
					{
						Version: "535.104.12",
					},
					{
						Version: "535.104.05",
					},
					{
						Label:   "R470",
						Version: "470.223.02",
					},
					{
						Version: "470.199.02",
					},
				},
			},
		},
	}
	binaryMockData, err := proto.Marshal(mockData)
	if err != nil {
		t.Fatalf("Failed to marshal mockdata to binary array: %v", err)
	}
	fakeGCS.Objects[path.Join("/", fakeBucket, fakePrefix, gpuDriverProtoBin)] = binaryMockData
	tempDir, err := os.MkdirTemp("", "mockGpuInstallDir")
	if err != nil {
		t.Fatalf("Failed to create tempdir: %v", err)
	}
	defer os.RemoveAll(tempDir)
	expectedFilePath := filepath.Join(tempDir, gpuDriverProtoBin)
	var FakeGCSDownloader = cos.NewGCSDownloader(fakeGCSClient, nil, fakeBucket, fakePrefix, "", "")
	actualData, err := DownloadGPUDriverVersionsProto(ctx, FakeGCSDownloader, tempDir)
	if err != nil {
		t.Fatalf("DownloadGPUDriverVersionsProto returned an error: %v", err)
	}
	_, err = os.Stat(expectedFilePath)
	if os.IsNotExist(err) {
		t.Errorf("Expected file %s does not exist.", expectedFilePath)
	} else if err != nil {
		t.Fatalf("Error occurs when checking the existence of the file: %s", expectedFilePath)
	}

	if !bytes.Equal(binaryMockData, actualData) {
		t.Errorf("Data mismatch. Expected %v, got %v", binaryMockData, actualData)
	}

}

func TestGetLoadedNVIDIAKernelModuleVersion(t *testing.T) {
	tempDir, err := os.MkdirTemp("", "mockNVIDIAKernelModuleVersionDir")
	if err != nil {
		t.Fatalf("Failed to create tempdir: %v", err)
	}
	defer os.RemoveAll(tempDir)

	for index, tc := range []struct {
		testName     string
		fileName     string
		contentStr   string
		expectOutput string
	}{
		{"550DriverVersionFile", "550versionFile", "NVRM version: NVIDIA UNIX Open Kernel Module for x86_64  550.90.07 \n Release Build  " +
			"(builder@1f48d05e873d)  Fri Jul 12 16:29:04 UTC 2024 GCC version:  Selected multilib: .;@m64", "550.90.07"},
		{"535DriverVersionFile", "535versionFile", "NVRM version: NVIDIA UNIX x86_64 Kernel Module  535.129.03  Thu Oct 19 18:56:32 UTC 2023" +
			"GCC version:  Selected multilib: .;@m64", "535.129.03"},
		{"EmptyFile", "emptyVersionFile", "Test empty", ""},
		{"FileNotExist", "nonExistFile", "", ""},
	} {
		t.Run(fmt.Sprintf("Test %v: %s", index, tc.testName), func(t *testing.T) {
			testVersionFilePath := filepath.Join(tempDir, tc.fileName)
			if tc.fileName != "nonExistFile" {
				file, err := os.Create(testVersionFilePath)
				if err != nil {
					t.Fatalf("Error creating %s with error: %v", testVersionFilePath, err)
				}
				defer file.Close()
				_, err = file.WriteString(tc.contentStr)
				if err != nil {
					t.Fatalf("Error writing to %s with error: %v", testVersionFilePath, err)
				}
			}
			actualResult := GetLoadedNVIDIAKernelModuleVersion(testVersionFilePath)
			if actualResult != tc.expectOutput {
				t.Errorf("Unexpected return value, want %v, got %v", tc.expectOutput, actualResult)
			}
		})
	}
}

func TestInstallImexDriver(t *testing.T) {
	driverVersion := "570.124.06"
	tarballPath := createFakeImexTarball(t, driverVersion)

	// Test destination dir
	containerDir := t.TempDir()
	hostDir := t.TempDir()
	imexConfigDir := "imex-config"

	binDir := filepath.Join(containerDir, "bin")
	if err := os.MkdirAll(binDir, 0755); err != nil {
		t.Fatalf("failed to create bin directory: %v", err)
	}

	err := InstallImexDriver(tarballPath, driverVersion, hostDir, containerDir)
	if err != nil {
		t.Fatalf("expected success but got error: %v", err)
	}

	expectedFiles := map[string]string{
		fmt.Sprintf("%s/bin/nvidia-imex", containerDir):        "test1",
		fmt.Sprintf("%s/bin/nvidia-imex-ctl", containerDir):    "test2",
		fmt.Sprintf("%s/imex-config/config.cfg", containerDir): fmt.Sprintf("IMEX_NODE_CONFIG_FILE=%s", filepath.Join(hostDir, imexConfigDir, "nodes_config.cfg")),
	}
	for dstpath, expectedContent := range expectedFiles {
		data, err := os.ReadFile(dstpath)
		if err != nil {
			t.Errorf("expected file %s not found: %v", dstpath, err)
			continue
		}
		if string(data) != expectedContent {
			t.Errorf("file content mismatch for %s: got %q, want %q", dstpath, string(data), expectedContent)
		}
	}
}

func createFakeImexTarball(t *testing.T, version string) string {
	tarDir := t.TempDir()
	tarPath := filepath.Join(tarDir, "fake-imex.tar")
	file, err := os.Create(tarPath)
	if err != nil {
		t.Fatalf("failed to create tar file: %v", err)
	}
	defer file.Close()

	tw := tar.NewWriter(file)
	defer tw.Close()

	archiveRoot := fmt.Sprintf("nvidia-imex-linux-sbsa-%s-archive", version)
	files := []struct {
		path, content string
	}{
		{fmt.Sprintf("%s/usr/bin/nvidia-imex", archiveRoot), "test1"},
		{fmt.Sprintf("%s/usr/bin/nvidia-imex-ctl", archiveRoot), "test2"},
		{fmt.Sprintf("%s/etc/nvidia-imex/config.cfg", archiveRoot), "IMEX_NODE_CONFIG_FILE=/etc/nvidia-imex/nodes_config.cfg"},
	}
	for _, f := range files {
		header := &tar.Header{
			Name: f.path,
			Mode: 0755,
			Size: int64(len(f.content)),
		}
		if err := tw.WriteHeader(header); err != nil {
			t.Fatalf("failed to write tar header: %v", err)
		}
		if _, err := tw.Write([]byte(f.content)); err != nil {
			t.Fatalf("failed to write file content to tar: %v", err)
		}
	}
	return tarPath

}

func TestMergeModuleParams(t *testing.T) {
	// These are the defaults from InstallGDRCopy
	defaults := map[string]string{
		"dbg_enabled":            "0",
		"info_enabled":           "0",
		"use_persistent_mapping": "1",
	}

	testCases := []struct {
		name       string
		userParams []string
		want       []string
	}{
		{
			name:       "No user params, all defaults applied",
			userParams: []string{},
			want:       []string{"dbg_enabled=0", "info_enabled=0", "use_persistent_mapping=1"},
		},
		{
			name:       "User overrides one default",
			userParams: []string{"dbg_enabled=1"},
			want:       []string{"dbg_enabled=1", "info_enabled=0", "use_persistent_mapping=1"},
		},
		{
			name:       "User adds a custom param",
			userParams: []string{"foo=bar"},
			want:       []string{"foo=bar", "dbg_enabled=0", "info_enabled=0", "use_persistent_mapping=1"},
		},
		{
			name:       "User overrides one and adds one",
			userParams: []string{"use_persistent_mapping=0", "custom=true"},
			want:       []string{"use_persistent_mapping=0", "custom=true", "dbg_enabled=0", "info_enabled=0"},
		},
		{
			name:       "User overrides all defaults",
			userParams: []string{"dbg_enabled=1", "info_enabled=1", "use_persistent_mapping=0"},
			want:       []string{"dbg_enabled=1", "info_enabled=1", "use_persistent_mapping=0"},
		},
	}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			got := mergeModuleParams(tc.userParams, defaults)

			// Sort slices before comparing since parameter order does not matter.
			sort.Strings(got)
			sort.Strings(tc.want)

			if diff := cmp.Diff(tc.want, got); diff != "" {
				t.Errorf("mergeModuleParams() mismatch (-want +got):\n%s", diff)
			}
		})
	}
}