devices: add interface "sandbox.AddDevice"

Fixes #50 .

Add new interface sandbox.AddDevice, then for Frakti use case, a device
can be attached to sandbox before container is created.

Signed-off-by: Wei Zhang <zhangwei555@huawei.com>

virtcontainers/api.go

@@ -11,6 +11,7 @@ import (
 	"syscall"
 
 	deviceApi "github.com/kata-containers/runtime/virtcontainers/device/api"
+	deviceConfig "github.com/kata-containers/runtime/virtcontainers/device/config"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/sirupsen/logrus"
 )
@@ -760,3 +761,24 @@ func PauseContainer(sandboxID, containerID string) error {
 func ResumeContainer(sandboxID, containerID string) error {
 	return togglePauseContainer(sandboxID, containerID, false)
 }
+
+// AddDevice will add a device to sandbox
+func AddDevice(sandboxID string, info deviceConfig.DeviceInfo) (deviceApi.Device, error) {
+	if sandboxID == "" {
+		return nil, errNeedSandboxID
+	}
+
+	lockFile, err := rwLockSandbox(sandboxID)
+	if err != nil {
+		return nil, err
+	}
+	defer unlockSandbox(lockFile)
+
+	s, err := fetchSandbox(sandboxID)
+	if err != nil {
+		return nil, err
+	}
+	defer s.releaseStatelessSandbox()
+
+	return s.AddDevice(info)
+}

virtcontainers/container.go

@@ -1133,13 +1133,22 @@ func (c *Container) attachDevices() error {
 
 func (c *Container) detachDevices() error {
 	for _, dev := range c.devices {
-		if err := c.sandbox.devManager.DetachDevice(dev.ID, c.sandbox); err != nil {
+		err := c.sandbox.devManager.DetachDevice(dev.ID, c.sandbox)
-			if err == manager.ErrDeviceNotAttached {
+		if err != nil && err != manager.ErrDeviceNotAttached {
-				// skip if device isn't attached
-				continue
-			}
 			return err
 		}
+
+		if err = c.sandbox.devManager.RemoveDevice(dev.ID); err != nil {
+			c.Logger().WithFields(logrus.Fields{
+				"container": c.id,
+				"device-id": dev.ID,
+			}).WithError(err).Error("remove device failed")
+
+			// ignore the device not exist error
+			if err != manager.ErrDeviceNotExist {
+				return err
+			}
+		}
 	}
 
 	if err := c.sandbox.storeSandboxDevices(); err != nil {

virtcontainers/device/api/interface.go

@@ -62,6 +62,7 @@ type Device interface {
 // device management object.
 type DeviceManager interface {
 	NewDevice(config.DeviceInfo) (Device, error)
+	RemoveDevice(string) error
 	AttachDevice(string, DeviceReceiver) error
 	DetachDevice(string, DeviceReceiver) error
 	IsDeviceAttached(string) bool

virtcontainers/device/manager/manager.go

@@ -93,7 +93,7 @@ func (dm *deviceManager) createDevice(devInfo config.DeviceInfo) (api.Device, er
 	}
 }
 
-// NewDevice creates bundles of devices based on array of DeviceInfo
+// NewDevice creates a device based on specified DeviceInfo
 func (dm *deviceManager) NewDevice(devInfo config.DeviceInfo) (api.Device, error) {
 	dm.Lock()
 	defer dm.Unlock()
@@ -104,6 +104,17 @@ func (dm *deviceManager) NewDevice(devInfo config.DeviceInfo) (api.Device, error
 	return dev, err
 }
 
+// RemoveDevice deletes the device from list based on specified device id
+func (dm *deviceManager) RemoveDevice(id string) error {
+	dm.Lock()
+	defer dm.Unlock()
+	if _, ok := dm.devices[id]; !ok {
+		return ErrDeviceNotExist
+	}
+	delete(dm.devices, id)
+	return nil
+}
+
 func (dm *deviceManager) newDeviceID() (string, error) {
 	for i := 0; i < 5; i++ {
 		// generate an random ID

virtcontainers/implementation.go

@@ -12,6 +12,8 @@ package virtcontainers
 import (
 	"syscall"
 
+	"github.com/kata-containers/runtime/virtcontainers/device/api"
+	"github.com/kata-containers/runtime/virtcontainers/device/config"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/sirupsen/logrus"
 )
@@ -141,3 +143,8 @@ func (impl *VCImpl) PauseContainer(sandboxID, containerID string) error {
 func (impl *VCImpl) ResumeContainer(sandboxID, containerID string) error {
 	return ResumeContainer(sandboxID, containerID)
 }
+
+// AddDevice will add a device to sandbox
+func (impl *VCImpl) AddDevice(sandboxID string, info config.DeviceInfo) (api.Device, error) {
+	return AddDevice(sandboxID, info)
+}

virtcontainers/interfaces.go

@@ -9,6 +9,8 @@ import (
 	"io"
 	"syscall"
 
+	"github.com/kata-containers/runtime/virtcontainers/device/api"
+	"github.com/kata-containers/runtime/virtcontainers/device/config"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/sirupsen/logrus"
 )
@@ -41,6 +43,8 @@ type VC interface {
 	UpdateContainer(sandboxID, containerID string, resources specs.LinuxResources) error
 	PauseContainer(sandboxID, containerID string) error
 	ResumeContainer(sandboxID, containerID string) error
+
+	AddDevice(sandboxID string, info config.DeviceInfo) (api.Device, error)
 }
 
 // VCSandbox is the Sandbox interface
@@ -70,6 +74,8 @@ type VCSandbox interface {
 	SignalProcess(containerID, processID string, signal syscall.Signal, all bool) error
 	WinsizeProcess(containerID, processID string, height, width uint32) error
 	IOStream(containerID, processID string) (io.WriteCloser, io.Reader, io.Reader, error)
+
+	AddDevice(info config.DeviceInfo) (api.Device, error)
 }
 
 // VCContainer is the Container interface

virtcontainers/pkg/vcmock/mock.go

@@ -20,6 +20,8 @@ import (
 	"syscall"
 
 	vc "github.com/kata-containers/runtime/virtcontainers"
+	"github.com/kata-containers/runtime/virtcontainers/device/api"
+	"github.com/kata-containers/runtime/virtcontainers/device/config"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/sirupsen/logrus"
 )
@@ -239,3 +241,12 @@ func (m *VCMock) ResumeContainer(sandboxID, containerID string) error {
 
 	return fmt.Errorf("%s: %s (%+v): sandboxID: %v, containerID: %v", mockErrorPrefix, getSelf(), m, sandboxID, containerID)
 }
+
+// AddDevice implements the VC function of the same name.
+func (m *VCMock) AddDevice(sandboxID string, info config.DeviceInfo) (api.Device, error) {
+	if m.AddDeviceFunc != nil {
+		return m.AddDeviceFunc(sandboxID, info)
+	}
+
+	return nil, fmt.Errorf("%s: %s (%+v): sandboxID: %v", mockErrorPrefix, getSelf(), m, sandboxID)
+}

virtcontainers/pkg/vcmock/sandbox.go

@@ -10,6 +10,8 @@ import (
 	"syscall"
 
 	vc "github.com/kata-containers/runtime/virtcontainers"
+	"github.com/kata-containers/runtime/virtcontainers/device/api"
+	"github.com/kata-containers/runtime/virtcontainers/device/config"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
 )
 
@@ -138,3 +140,8 @@ func (s *Sandbox) WinsizeProcess(containerID, processID string, height, width ui
 func (s *Sandbox) IOStream(containerID, processID string) (io.WriteCloser, io.Reader, io.Reader, error) {
 	return nil, nil, nil, nil
 }
+
+// AddDevice adds a device to sandbox
+func (s *Sandbox) AddDevice(info config.DeviceInfo) (api.Device, error) {
+	return nil, nil
+}

virtcontainers/pkg/vcmock/types.go

@@ -9,6 +9,8 @@ import (
 	"syscall"
 
 	vc "github.com/kata-containers/runtime/virtcontainers"
+	"github.com/kata-containers/runtime/virtcontainers/device/api"
+	"github.com/kata-containers/runtime/virtcontainers/device/config"
 	specs "github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/sirupsen/logrus"
 )
@@ -61,4 +63,6 @@ type VCMock struct {
 	UpdateContainerFunc      func(sandboxID, containerID string, resources specs.LinuxResources) error
 	PauseContainerFunc       func(sandboxID, containerID string) error
 	ResumeContainerFunc      func(sandboxID, containerID string) error
+
+	AddDeviceFunc func(sandboxID string, info config.DeviceInfo) (api.Device, error)
 }

virtcontainers/sandbox.go

@@ -1546,3 +1546,25 @@ func (s *Sandbox) AppendDevice(device api.Device) error {
 	}
 	return fmt.Errorf("unsupported device type")
 }
+
+// AddDevice will add a device to sandbox
+func (s *Sandbox) AddDevice(info config.DeviceInfo) (api.Device, error) {
+	if s.devManager == nil {
+		return nil, fmt.Errorf("device manager isn't initialized")
+	}
+
+	b, err := s.devManager.NewDevice(info)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := s.devManager.AttachDevice(b.DeviceID(), s); err != nil {
+		return nil, err
+	}
+
+	if err := s.storeSandboxDevices(); err != nil {
+		return nil, err
+	}
+
+	return b, nil
+}

virtcontainers/sandbox_test.go

@@ -1629,3 +1629,79 @@ func TestAttachBlockDevice(t *testing.T) {
 	err = device.Detach(sandbox)
 	assert.Nil(t, err)
 }
+
+func TestPreAddDevice(t *testing.T) {
+	fs := &filesystem{}
+	hypervisor := &mockHypervisor{}
+
+	hConfig := HypervisorConfig{
+		BlockDeviceDriver: VirtioBlock,
+	}
+
+	sconfig := &SandboxConfig{
+		HypervisorConfig: hConfig,
+	}
+
+	dm := manager.NewDeviceManager(VirtioBlock, nil)
+	// create a sandbox first
+	sandbox := &Sandbox{
+		id:         testSandboxID,
+		storage:    fs,
+		hypervisor: hypervisor,
+		config:     sconfig,
+		devManager: dm,
+	}
+
+	contID := "100"
+	container := Container{
+		sandbox:   sandbox,
+		id:        contID,
+		sandboxID: testSandboxID,
+	}
+	container.state.State = StateReady
+
+	// create state file
+	path := filepath.Join(runStoragePath, testSandboxID, container.ID())
+	err := os.MkdirAll(path, dirMode)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	defer os.RemoveAll(path)
+
+	stateFilePath := filepath.Join(path, stateFile)
+	os.Remove(stateFilePath)
+
+	_, err = os.Create(stateFilePath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.Remove(stateFilePath)
+
+	path = "/dev/hda"
+	deviceInfo := config.DeviceInfo{
+		HostPath:      path,
+		ContainerPath: path,
+		DevType:       "b",
+	}
+
+	// Add a mount device for a mountpoint before container's creation
+	dev, err := sandbox.AddDevice(deviceInfo)
+	assert.Nil(t, err)
+
+	// in Frakti use case, here we will create and start the container
+	// which will attach same device twice
+	container.mounts = []Mount{
+		{
+			Destination:   path,
+			Source:        path,
+			Type:          "bind",
+			BlockDeviceID: dev.DeviceID(),
+		},
+	}
+
+	mounts, err := container.mountSharedDirMounts("", "")
+	assert.Nil(t, err)
+	assert.Equal(t, len(mounts), 0,
+		"mounts should contain nothing because it only contains a block device")
+}