Method create

src/docker/docker.cpp:119–161

Try<Owned<Docker>> Docker::create(
    const string& path,
    const string& socket,
    bool validate,
    const Option<JSON::Object>& config)
{
#ifndef __WINDOWS__
  // TODO(hausdorff): Currently, `path::absolute` does not handle all the edge
  // cases of Windows. Revisit this when MESOS-3442 is resolved.
  //
  // NOTE: When we do come back and fix this bug, it is also worth noting that
  // on Windows an empty value of `socket` is frequently used to connect to the
  // Docker host (i.e., the user wants to connect 'npipes://', with an empty
  // socket path). A full solution should accommodate this.
  if (!path::is_absolute(socket)) {
    return Error("Invalid Docker socket path: " + socket);
  }
#endif // __WINDOWS__

  Owned<Docker> docker(new Docker(path, socket, config));
  if (!validate) {
    return docker;
  }

#ifdef __linux__
  // Make sure that cgroups are mounted, and at least the 'cpu'
  // subsystem is attached.
  Result<string> hierarchy = cgroups::hierarchy("cpu");

  if (hierarchy.isNone()) {
    return Error("Failed to find a mounted cgroups hierarchy "
                 "for the 'cpu' subsystem; you probably need "
                 "to mount cgroups manually");
  }
#endif // __linux__

  Try<Nothing> validateVersion = docker->validateVersion(Version(1, 8, 0));
  if (validateVersion.isError()) {
    return Error(validateVersion.error());
  }

  return docker;
}


void commandDiscarded(const Subprocess& s, const string& cmd)