Add tests for runtime validation

Signed-off-by: Mrunal Patel <mrunalp@gmail.com>

validation/validation_test.go

@@ -0,0 +1,98 @@
+package validation
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"testing"
+
+	"github.com/mrunalp/fileutils"
+	"github.com/opencontainers/runtime-tools/generate"
+	"github.com/satori/go.uuid"
+)
+
+var (
+	runtime = "runc"
+)
+
+func init() {
+	runtime = os.Getenv("RUNTIME")
+}
+
+func runtimeValidate(runtime string, g *generate.Generator) error {
+	// Find the runtime binary in the PATH
+	runtimePath, err := exec.LookPath(runtime)
+	if err != nil {
+		return err
+	}
+
+	// Setup a temporary test directory
+	tmpDir, err := ioutil.TempDir("", "ocitest")
+	if err != nil {
+		return err
+	}
+	defer os.RemoveAll(tmpDir)
+
+	// Create bundle directory for the test container
+	bundleDir := tmpDir + "/busybox"
+	if err := os.MkdirAll(bundleDir, 0755); err != nil {
+		return err
+	}
+
+	// Untar the root fs
+	untarCmd := exec.Command("tar", "-xf", "../rootfs.tar.gz", "-C", bundleDir)
+	output, err := untarCmd.CombinedOutput()
+	if err != nil {
+		fmt.Println(string(output))
+		return err
+	}
+
+	// Copy the runtimetest binary to the rootfs
+	err = fileutils.CopyFile("../runtimetest", filepath.Join(bundleDir, "runtimetest"))
+
+	// Generate test configuration
+	err = g.SaveToFile(filepath.Join(bundleDir, "config.json"), generate.ExportOptions{})
+	if err != nil {
+		return err
+	}
+
+	// TODO: Use a library to split run into create/start
+	// Launch the OCI runtime
+	containerID := uuid.NewV4()
+	runtimeCmd := exec.Command(runtimePath, "run", containerID.String())
+	runtimeCmd.Dir = bundleDir
+	runtimeCmd.Stdin = os.Stdin
+	runtimeCmd.Stdout = os.Stdout
+	runtimeCmd.Stderr = os.Stderr
+	if err = runtimeCmd.Run(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func getDefaultGenerator() *generate.Generator {
+	g := generate.New()
+	g.SetRootPath(".")
+	g.SetProcessArgs([]string{"/runtimetest"})
+	return &g
+}
+
+func TestValidateBasic(t *testing.T) {
+	g := getDefaultGenerator()
+
+	if err := runtimeValidate(runtime, g); err != nil {
+		t.Errorf("%s failed validation: %v", runtime, err)
+	}
+}
+
+func TestValidateSysctls(t *testing.T) {
+	g := getDefaultGenerator()
+	g.AddLinuxSysctl("net.ipv4.ip_forward", "1")
+
+	if err := runtimeValidate(runtime, g); err != nil {
+		t.Errorf("%s failed validation: %v", runtime, err)
+	}
+}