Golang hcsshim.CreateSandboxLayer函數代碼示例

// Returns: LayerFolderPaht, VolumePath
func CreateAndActivateContainerLayer(di hcsshim.DriverInfo, containerLayerId, parentLayerPath string) (string, string, error) {
	var err error

	parentLayerId := GetLayerId(parentLayerPath)
	log.Printf("Parent layer %v path has Id %v", parentLayerPath, parentLayerId)

	err = hcsshim.CreateSandboxLayer(di, containerLayerId, parentLayerPath, []string{parentLayerPath})
	if err != nil {
		return "", "", err
	}

	err = hcsshim.ActivateLayer(di, containerLayerId)
	if err != nil {
		return "", "", err
	}

	err = hcsshim.PrepareLayer(di, containerLayerId, []string{parentLayerPath})
	if err != nil {
		return "", "", err
	}

	volumeMountPath, err := hcsshim.GetLayerMountPath(di, containerLayerId)
	if err != nil {
		return "", "", err
	}
	log.Printf("Container layer volume path %v", volumeMountPath)

	return GetLayerPath(di, containerLayerId), volumeMountPath, nil
}

// Create creates a new layer with the given id.
func (d *Driver) Create(id, parent, mountLabel string, storageOpt map[string]string) error {
	if len(storageOpt) != 0 {
		return fmt.Errorf("--storage-opt is not supported for windows")
	}

	rPId, err := d.resolveID(parent)
	if err != nil {
		return err
	}

	parentChain, err := d.getLayerChain(rPId)
	if err != nil {
		return err
	}

	var layerChain []string

	parentIsInit := strings.HasSuffix(rPId, "-init")

	if !parentIsInit && rPId != "" {
		parentPath, err := hcsshim.GetLayerMountPath(d.info, rPId)
		if err != nil {
			return err
		}
		layerChain = []string{parentPath}
	}

	layerChain = append(layerChain, parentChain...)

	if parentIsInit {
		if len(layerChain) == 0 {
			return fmt.Errorf("Cannot create a read/write layer without a parent layer.")
		}
		if err := hcsshim.CreateSandboxLayer(d.info, id, layerChain[0], layerChain); err != nil {
			return err
		}
	} else {
		if err := hcsshim.CreateLayer(d.info, id, rPId); err != nil {
			return err
		}
	}

	if _, err := os.Lstat(d.dir(parent)); err != nil {
		if err2 := hcsshim.DestroyLayer(d.info, id); err2 != nil {
			logrus.Warnf("Failed to DestroyLayer %s: %s", id, err2)
		}
		return fmt.Errorf("Cannot create layer with missing parent %s: %s", parent, err)
	}

	if err := d.setLayerChain(id, layerChain); err != nil {
		if err2 := hcsshim.DestroyLayer(d.info, id); err2 != nil {
			logrus.Warnf("Failed to DestroyLayer %s: %s", id, err2)
		}
		return err
	}

	return nil
}

func (daemon *Daemon) createRootfs(container *Container) error {
	// Step 1: create the container directory.
	// This doubles as a barrier to avoid race conditions.
	if err := os.Mkdir(container.root, 0700); err != nil {
		return err
	}

	if wd, ok := daemon.driver.(*windows.WindowsGraphDriver); ok {
		if container.ImageID != "" {
			// Get list of paths to parent layers.
			logrus.Debugln("createRootfs: Container has parent image:", container.ImageID)
			img, err := daemon.graph.Get(container.ImageID)
			if err != nil {
				return err
			}

			ids, err := daemon.graph.ParentLayerIds(img)
			if err != nil {
				return err
			}
			logrus.Debugf("Got image ids: %d", len(ids))

			if err := hcsshim.CreateSandboxLayer(wd.Info(), container.ID, container.ImageID, wd.LayerIdsToPaths(ids)); err != nil {
				return err
			}
		} else {
			if err := daemon.driver.Create(container.ID, container.ImageID); err != nil {
				return err
			}
		}
	} else {
		// Fall-back code path to allow the use of the VFS driver for development
		if err := daemon.driver.Create(container.ID, container.ImageID); err != nil {
			return err
		}

	}
	return nil
}

func (d *Driver) create(id, parent, mountLabel string, readOnly bool, storageOpt map[string]string) error {
	if len(storageOpt) != 0 {
		return fmt.Errorf("--storage-opt is not supported for windows")
	}

	rPId, err := d.resolveID(parent)
	if err != nil {
		return err
	}

	parentChain, err := d.getLayerChain(rPId)
	if err != nil {
		return err
	}

	var layerChain []string

	if rPId != "" {
		parentPath, err := hcsshim.GetLayerMountPath(d.info, rPId)
		if err != nil {
			return err
		}
		if _, err := os.Stat(filepath.Join(parentPath, "Files")); err == nil {
			// This is a legitimate parent layer (not the empty "-init" layer),
			// so include it in the layer chain.
			layerChain = []string{parentPath}
		}
	}

	layerChain = append(layerChain, parentChain...)

	if readOnly {
		if err := hcsshim.CreateLayer(d.info, id, rPId); err != nil {
			return err
		}
	} else {
		var parentPath string
		if len(layerChain) != 0 {
			parentPath = layerChain[0]
		}

		if isTP5OrOlder() {
			// Pre-create the layer directory, providing an ACL to give the Hyper-V Virtual Machines
			// group access. This is necessary to ensure that Hyper-V containers can access the
			// virtual machine data. This is not necessary post-TP5.
			path, err := syscall.UTF16FromString(filepath.Join(d.info.HomeDir, id))
			if err != nil {
				return err
			}
			// Give system and administrators full control, and VMs read, write, and execute.
			// Mark these ACEs as inherited.
			sd, err := winio.SddlToSecurityDescriptor("D:(A;OICI;FA;;;SY)(A;OICI;FA;;;BA)(A;OICI;FRFWFX;;;S-1-5-83-0)")
			if err != nil {
				return err
			}
			err = syscall.CreateDirectory(&path[0], &syscall.SecurityAttributes{
				Length:             uint32(unsafe.Sizeof(syscall.SecurityAttributes{})),
				SecurityDescriptor: uintptr(unsafe.Pointer(&sd[0])),
			})
			if err != nil {
				return err
			}
		}

		if err := hcsshim.CreateSandboxLayer(d.info, id, parentPath, layerChain); err != nil {
			return err
		}
	}

	if _, err := os.Lstat(d.dir(parent)); err != nil {
		if err2 := hcsshim.DestroyLayer(d.info, id); err2 != nil {
			logrus.Warnf("Failed to DestroyLayer %s: %s", id, err2)
		}
		return fmt.Errorf("Cannot create layer with missing parent %s: %s", parent, err)
	}

	if err := d.setLayerChain(id, layerChain); err != nil {
		if err2 := hcsshim.DestroyLayer(d.info, id); err2 != nil {
			logrus.Warnf("Failed to DestroyLayer %s: %s", id, err2)
		}
		return err
	}

	return nil
}

func (d *Driver) create(id, parent, mountLabel string, readOnly bool, storageOpt map[string]string) error {
	rPId, err := d.resolveID(parent)
	if err != nil {
		return err
	}

	parentChain, err := d.getLayerChain(rPId)
	if err != nil {
		return err
	}

	var layerChain []string

	if rPId != "" {
		parentPath, err := hcsshim.GetLayerMountPath(d.info, rPId)
		if err != nil {
			return err
		}
		if _, err := os.Stat(filepath.Join(parentPath, "Files")); err == nil {
			// This is a legitimate parent layer (not the empty "-init" layer),
			// so include it in the layer chain.
			layerChain = []string{parentPath}
		}
	}

	layerChain = append(layerChain, parentChain...)

	if readOnly {
		if err := hcsshim.CreateLayer(d.info, id, rPId); err != nil {
			return err
		}
	} else {
		var parentPath string
		if len(layerChain) != 0 {
			parentPath = layerChain[0]
		}

		if err := hcsshim.CreateSandboxLayer(d.info, id, parentPath, layerChain); err != nil {
			return err
		}

		storageOptions, err := parseStorageOpt(storageOpt)
		if err != nil {
			return fmt.Errorf("Failed to parse storage options - %s", err)
		}

		if storageOptions.size != 0 {
			if err := hcsshim.ExpandSandboxSize(d.info, id, storageOptions.size); err != nil {
				return err
			}
		}
	}

	if _, err := os.Lstat(d.dir(parent)); err != nil {
		if err2 := hcsshim.DestroyLayer(d.info, id); err2 != nil {
			logrus.Warnf("Failed to DestroyLayer %s: %s", id, err2)
		}
		return fmt.Errorf("Cannot create layer with missing parent %s: %s", parent, err)
	}

	if err := d.setLayerChain(id, layerChain); err != nil {
		if err2 := hcsshim.DestroyLayer(d.info, id); err2 != nil {
			logrus.Warnf("Failed to DestroyLayer %s: %s", id, err2)
		}
		return err
	}

	return nil
}

func (d *Driver) Create(id, parent string) error {
	rPId, err := d.resolveId(parent)
	if err != nil {
		return err
	}

	parentChain, err := d.getLayerChain(rPId)
	if err != nil {
		return err
	}

	var layerChain []string

	parentIsInit := strings.HasSuffix(rPId, "-init")

	if !parentIsInit && rPId != "" {
		parentPath, err := hcsshim.GetLayerMountPath(d.info, rPId)
		if err != nil {
			return err
		}
		layerChain = []string{parentPath}
	}

	layerChain = append(layerChain, parentChain...)

	if parentIsInit {
		if len(layerChain) == 0 {
			return fmt.Errorf("Cannot create a read/write layer without a parent layer.")
		}
		if err := hcsshim.CreateSandboxLayer(d.info, id, layerChain[0], layerChain); err != nil {
			return err
		}
	} else {
		if err := hcsshim.CreateLayer(d.info, id, rPId); err != nil {
			return err
		}
	}

	if _, err := os.Lstat(d.dir(parent)); err == nil {
		if err := d.setLayerChain(id, layerChain); err != nil {
			if err2 := hcsshim.DestroyLayer(d.info, id); err2 != nil {
				logrus.Warnf("Failed to DestroyLayer %s: %s", id, err)
			}
			return err
		}
	} else if os.IsNotExist(err) {
		// If the parent doesn't exist, this must be a special creation for an image
		// registered at an alternate location. Use the parent id as the alternate ID.
		if err := d.setId(id, parent); err != nil {
			if err2 := hcsshim.DestroyLayer(d.info, id); err2 != nil {
				logrus.Warnf("Failed to DestroyLayer %s: %s", id, err)
			}
			return err
		}
	} else {
		if err2 := hcsshim.DestroyLayer(d.info, id); err2 != nil {
			logrus.Warnf("Failed to DestroyLayer %s: %s", id, err)
		}
		return err
	}

	return nil
}