Function hierarchies

src/linux/cgroups.cpp:446–470

Try<set<string>> hierarchies()
{
  // Read currently mounted file systems from /proc/mounts.
  Try<fs::MountTable> table = fs::MountTable::read("/proc/mounts");
  if (table.isError()) {
    return Error(table.error());
  }

  set<string> results;
  foreach (const fs::MountTable::Entry& entry, table->entries) {
    if (entry.type == "cgroup") {
      Result<string> realpath = os::realpath(entry.dir);
      if (!realpath.isSome()) {
        return Error(
            "Failed to determine canonical path of " + entry.dir + ": " +
            (realpath.isError()
             ? realpath.error()
             : "No such file or directory"));
      }
      results.insert(realpath.get());
    }
  }

  return results;
}


Result<string> hierarchy(const string& subsystems)