Add runtime-validate command

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

cmd/oci-runtime-tool/main.go

@@ -27,6 +27,7 @@ func main() {
 	app.Commands = []cli.Command{
 		generateCommand,
 		bundleValidateCommand,
+		runtimeValidateCommand,
 	}
 
 	if err := app.Run(os.Args); err != nil {

cmd/oci-runtime-tool/runtime_validate.go

@@ -0,0 +1,84 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+
+	"github.com/mrunalp/fileutils"
+	"github.com/opencontainers/runtime-tools/generate"
+	"github.com/satori/go.uuid"
+	"github.com/urfave/cli"
+)
+
+var runtimeValidateFlags = []cli.Flag{
+	cli.StringFlag{Name: "runtime", Value: "runc", Usage: "OCI runtime"},
+}
+
+var runtimeValidateCommand = cli.Command{
+	Name:   "runtime-validate",
+	Usage:  "validate an OCI runtime",
+	Flags:  runtimeValidateFlags,
+	Before: before,
+	Action: func(context *cli.Context) error {
+		return runtimeValidate(context.String("runtime"))
+	},
+}
+
+func runtimeValidate(runtime string) 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
+	}
+
+	// TODO: Use go package for untar and allow using other root filesystems
+	// 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
+	g := generate.New()
+	g.SetRootPath(".")
+	g.SetProcessArgs([]string{"/runtimetest"})
+	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
+}