Method getContainersDiff

lib/manager/manager.go:945–986

Detect all containers that have been added or deleted from the specified container.

(containerName string)

// Detect all containers that have been added or deleted from the specified container.
func (m *manager) getContainersDiff(containerName string) (added []info.ContainerReference, removed []info.ContainerReference, err error) {
	// Get all subcontainers recursively.
	cont, ok := m.containers.Load(namespacedContainerName{Name: containerName})
	if !ok {
		return nil, nil, fmt.Errorf("failed to find container %q while checking for new containers", containerName)
	}
	allContainers, err := cont.handler.ListContainers(container.ListRecursive)

	if err != nil {
		return nil, nil, err
	}
	allContainers = append(allContainers, info.ContainerReference{Name: containerName})

	// Determine which were added and which were removed.
	allContainersSet := make(map[string]*containerData)
	m.containers.Range(func(name namespacedContainerName, cont *containerData) bool {
		if cont == nil {
			return true
		}
		// Only add the canonical name.
		if cont.info.Name == name.Name {
			allContainersSet[name.Name] = cont
		}
		return true
	})

	// Added containers
	for _, c := range allContainers {
		delete(allContainersSet, c.Name)
		_, ok := m.containers.Load(namespacedContainerName{Name: c.Name})
		if !ok {
			added = append(added, c)
		}
	}

	// Removed ones are no longer in the container listing.
	for _, d := range allContainersSet {
		removed = append(removed, d.info.ContainerReference)
	}

	return
}

// Detect the existing subcontainers and reflect the setup here.
func (m *manager) detectSubcontainers(containerName string) error {