Function hierarchy

src/linux/cgroups.cpp:473–498

Result<string> hierarchy(const string& subsystems)
{
  Result<string> hierarchy = None();
  Try<set<string>> hierarchies = cgroups::hierarchies();
  if (hierarchies.isError()) {
    return Error(hierarchies.error());
  }

  foreach (const string& candidate, hierarchies.get()) {
    if (subsystems.empty()) {
      hierarchy = candidate;
      break;
    }

    // Check and see if this candidate meets our subsystem requirements.
    Try<bool> mounted = cgroups::mounted(candidate, subsystems);
    if (mounted.isError()) {
      return Error(mounted.error());
    } else if (mounted.get()) {
      hierarchy = candidate;
      break;
    }
  }

  return hierarchy;
}


Try<bool> enabled(const string& subsystems)