Implement CreateContainer

Signed-off-by: Haiyan Meng <hmeng@redhat.com>

cmd/client/main.go

@@ -31,14 +31,22 @@ func getClientConnection() (*grpc.ClientConn, error) {
 	return conn, nil
 }
 
-func loadPodSandboxConfig(path string) (*pb.PodSandboxConfig, error) {
+func openFile(path string) (*os.File, error) {
 	f, err := os.Open(path)
 	if err != nil {
 		if os.IsNotExist(err) {
-			return nil, fmt.Errorf("pod sandbox config at %s not found", path)
+			return nil, fmt.Errorf("config at %s not found", path)
 		}
 		return nil, err
 	}
+	return f, nil
+}
+
+func loadPodSandboxConfig(path string) (*pb.PodSandboxConfig, error) {
+	f, err := openFile(path)
+	if err != nil {
+		return nil, err
+	}
 	defer f.Close()
 
 	var config pb.PodSandboxConfig
@@ -48,6 +56,20 @@ func loadPodSandboxConfig(path string) (*pb.PodSandboxConfig, error) {
 	return &config, nil
 }
 
+func loadContainerConfig(path string) (*pb.ContainerConfig, error) {
+	f, err := openFile(path)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+
+	var config pb.ContainerConfig
+	if err := json.NewDecoder(f).Decode(&config); err != nil {
+		return nil, err
+	}
+	return &config, nil
+}
+
 // CreatePodSandbox sends a CreatePodSandboxRequest to the server, and parses
 // the returned CreatePodSandboxResponse.
 func CreatePodSandbox(client pb.RuntimeServiceClient, path string) error {
@@ -64,6 +86,25 @@ func CreatePodSandbox(client pb.RuntimeServiceClient, path string) error {
 	return nil
 }
 
+// CreateContainer sends a CreateContainerRequest to the server, and parses
+// the returned CreateContainerResponse.
+func CreateContainer(client pb.RuntimeServiceClient, sandbox string, path string) error {
+	config, err := loadContainerConfig(path)
+	if err != nil {
+		return err
+	}
+
+	r, err := client.CreateContainer(context.Background(), &pb.CreateContainerRequest{
+		PodSandboxId: &sandbox,
+		Config:       config,
+	})
+	if err != nil {
+		return err
+	}
+	fmt.Println(r)
+	return nil
+}
+
 // Version sends a VersionRequest to the server, and parses the returned VersionResponse.
 func Version(client pb.RuntimeServiceClient, version string) error {
 	r, err := client.Version(context.Background(), &pb.VersionRequest{Version: &version})
@@ -82,6 +123,7 @@ func main() {
 	app.Commands = []cli.Command{
 		runtimeVersionCommand,
 		createPodSandboxCommand,
+		createContainerCommand,
 		pullImageCommand,
 	}
 
@@ -168,3 +210,38 @@ var createPodSandboxCommand = cli.Command{
 		return nil
 	},
 }
+
+var createContainerCommand = cli.Command{
+	Name:  "createcontainer",
+	Usage: "create a container",
+	Flags: []cli.Flag{
+		cli.StringFlag{
+			Name:  "sandbox",
+			Usage: "the id of the pod sandbox to which the container belongs",
+		},
+		cli.StringFlag{
+			Name:  "config",
+			Value: "config.json",
+			Usage: "the path of a container config file",
+		},
+	},
+	Action: func(context *cli.Context) error {
+		// Set up a connection to the server.
+		conn, err := getClientConnection()
+		if err != nil {
+			return fmt.Errorf("Failed to connect: %v", err)
+		}
+		defer conn.Close()
+		client := pb.NewRuntimeServiceClient(conn)
+
+		if !context.IsSet("sandbox") {
+			return fmt.Errorf("Please specify the id of the pod sandbox to which the container belongs via the --sandbox option")
+		}
+		// Test RuntimeServiceClient.CreateContainer
+		err = CreateContainer(client, context.String("sandbox"), context.String("config"))
+		if err != nil {
+			return fmt.Errorf("Creating the pod sandbox failed: %v", err)
+		}
+		return nil
+	},
+}