Function Load

pkg/cgroups/cgroups.go:432–471

Load loads an existing cgroup control

(path string)

// Load loads an existing cgroup control
func Load(path string) (*CgroupControl, error) {
	cgroup2, err := IsCgroup2UnifiedMode()
	if err != nil {
		return nil, err
	}
	control := &CgroupControl{
		cgroup2: cgroup2,
		path:    path,
		systemd: false,
	}
	if !cgroup2 {
		controllers, err := getAvailableControllers(handlers, false)
		if err != nil {
			return nil, err
		}
		control.additionalControllers = controllers
	}
	if !cgroup2 {
		oneExists := false
		// check that the cgroup exists at least under one controller
		for name := range handlers {
			p := control.getCgroupv1Path(name)
			if _, err := os.Stat(p); err == nil {
				oneExists = true
				break
			}
		}

		// if there is no controller at all, raise an error
		if !oneExists {
			if unshare.IsRootless() {
				return nil, ErrCgroupV1Rootless
			}
			// compatible with the error code
			// used by containerd/cgroups
			return nil, ErrCgroupDeleted
		}
	}
	return control, nil
}

// CreateSystemdUnit creates the systemd cgroup
func (c *CgroupControl) CreateSystemdUnit(path string) error {