api: add sandbox startcontainer API

And make VC.StartContainer a wrapper of it.

Signed-off-by: Peng Tao <[email protected]>

virtcontainers/api.go

@@ -355,19 +355,12 @@ func StartContainer(sandboxID, containerID string) (VCContainer, error) {
 	}
 	defer unlockSandbox(lockFile)
 
-	p, err := fetchSandbox(sandboxID)
-	if err != nil {
-		return nil, err
-	}
-
-	// Fetch the container.
-	c, err := p.findContainer(containerID)
+	s, err := fetchSandbox(sandboxID)
 	if err != nil {
 		return nil, err
 	}
 
-	// Start it.
-	err = c.start()
+	c, err := s.StartContainer(containerID)
 	if err != nil {
 		return nil, err
 	}

virtcontainers/interfaces.go

@@ -52,6 +52,7 @@ type VCSandbox interface {
 	Delete() error
 	CreateContainer(contConfig ContainerConfig) (VCContainer, error)
 	DeleteContainer(contID string) (VCContainer, error)
+	StartContainer(containerID string) (VCContainer, error)
 }
 
 // VCContainer is the Container interface

virtcontainers/pkg/vcmock/sandbox.go

@@ -79,3 +79,8 @@ func (p *Sandbox) CreateContainer(conf vc.ContainerConfig) (vc.VCContainer, erro
 func (p *Sandbox) DeleteContainer(contID string) (vc.VCContainer, error) {
 	return &Container{}, nil
 }
+
+// StartContainer implements the VCSandbox function of the same name.
+func (p *Sandbox) StartContainer(contID string) (vc.VCContainer, error) {
+	return &Container{}, nil
+}

virtcontainers/sandbox.go

@@ -894,6 +894,23 @@ func (s *Sandbox) CreateContainer(contConfig ContainerConfig) (VCContainer, erro
 	return c, nil
 }
 
+// StartContainer starts a container in the sandbox
+func (s *Sandbox) StartContainer(containerID string) (VCContainer, error) {
+	// Fetch the container.
+	c, err := s.findContainer(containerID)
+	if err != nil {
+		return nil, err
+	}
+
+	// Start it.
+	err = c.start()
+	if err != nil {
+		return nil, err
+	}
+
+	return c, nil
+}
+
 // DeleteContainer deletes a container from the sandbox
 func (s *Sandbox) DeleteContainer(containerID string) (VCContainer, error) {
 	if containerID == "" {

virtcontainers/sandbox_test.go

@@ -1316,3 +1316,23 @@ func TestDeleteContainer(t *testing.T) {
 	_, err = s.DeleteContainer(contID)
 	assert.Nil(t, err, "Failed to delete container %s in sandbox %s: %v", contID, s.ID(), err)
 }
+
+func TestStartContainer(t *testing.T) {
+	s, err := testCreateSandbox(t, testSandboxID, MockHypervisor, newHypervisorConfig(nil, nil), NoopAgentType, NoopNetworkModel, NetworkConfig{}, nil, nil)
+	assert.Nil(t, err, "VirtContainers should not allow empty sandboxes")
+	defer cleanUp()
+
+	contID := "999"
+	_, err = s.StartContainer(contID)
+	assert.NotNil(t, err, "Starting non-existing container should fail")
+
+	err = s.start()
+	assert.Nil(t, err, "Failed to start sandbox: %v", err)
+
+	contConfig := newTestContainerConfigNoop(contID)
+	_, err = s.CreateContainer(contConfig)
+	assert.Nil(t, err, "Failed to create container %+v in sandbox %+v: %v", contConfig, s, err)
+
+	_, err = s.StartContainer(contID)
+	assert.Nil(t, err, "Start container failed: %v", err)
+}