Function Load

libcontainer/factory_linux.go:108–148

Load takes a path to the state directory (root) and an id of an existing container, and returns a Container object reconstructed from the saved state. This presents a read only view of the container.

(root, id string)

// container, and returns a Container object reconstructed from the saved
// state. This presents a read only view of the container.
func Load(root, id string) (*Container, error) {
	if root == "" {
		return nil, errors.New("root not set")
	}
	// when load, we need to check id is valid or not.
	if err := validateID(id); err != nil {
		return nil, err
	}
	stateDir, err := securejoin.SecureJoin(root, id)
	if err != nil {
		return nil, err
	}
	state, err := loadState(stateDir)
	if err != nil {
		return nil, err
	}
	r := &nonChildProcess{
		processPid:       state.InitProcessPid,
		processStartTime: state.InitProcessStartTime,
		fds:              state.ExternalDescriptors,
	}
	cm, err := manager.NewWithPaths(state.Config.Cgroups, state.CgroupPaths)
	if err != nil {
		return nil, err
	}
	c := &Container{
		initProcess:          r,
		initProcessStartTime: state.InitProcessStartTime,
		id:                   id,
		config:               &state.Config,
		cgroupManager:        cm,
		intelRdtManager:      intelrdt.NewManager(&state.Config, id, state.IntelRdtPath),
		stateDir:             stateDir,
		created:              state.Created,
	}
	c.state = &loadedState{c: c}
	if err := c.refreshState(); err != nil {
		return nil, err
	}
	return c, nil
}

func loadState(root string) (*State, error) {
	stateFilePath, err := securejoin.SecureJoin(root, stateFilename)