// FindCgroupMountpointDir is used to find the cgroup mount point on a Linux
// system.
func FindCgroupMountpointDir() (string, error) {
mount, err := cgroups.FindCgroupMountpointDir()
if err != nil {
switch e := err.(type) {
case *cgroups.NotFoundError:
// It's okay if the mount point is not discovered
return "", nil
default:
// All other errors are passed back as is
return "", e
}
}
return mount, nil
}
// Gets the cgroupRoot.
func getCgroupRoot() (string, error) {
cgroupRootLock.Lock()
defer cgroupRootLock.Unlock()
if cgroupRoot != "" {
return cgroupRoot, nil
}
root, err := cgroups.FindCgroupMountpointDir()
if err != nil {
return "", err
}
if _, err := os.Stat(root); err != nil {
return "", err
}
cgroupRoot = root
return cgroupRoot, nil
}