Function parse

src/slave/containerizer/docker.cpp:122–168

Parse the ContainerID from a Docker container and return None if the container was not launched from Mesos.

// Parse the ContainerID from a Docker container and return None if
// the container was not launched from Mesos.
Option<ContainerID> parse(const Docker::Container& container)
{
  Option<string> name = None();
  Option<ContainerID> containerId = None();

  if (strings::startsWith(container.name, DOCKER_NAME_PREFIX)) {
    name = strings::remove(
        container.name, DOCKER_NAME_PREFIX, strings::PREFIX);
  } else if (strings::startsWith(container.name, "/" + DOCKER_NAME_PREFIX)) {
    name = strings::remove(
        container.name, "/" + DOCKER_NAME_PREFIX, strings::PREFIX);
  }

  if (name.isSome()) {
    // For Mesos versions 0.23 to 1.3 (inclusive), the docker
    // container name format was:
    //   DOCKER_NAME_PREFIX + SlaveID + DOCKER_NAME_SEPERATOR + ContainerID.
    //
    // In versions <= 0.22 or >= 1.4, the name format is:
    //   DOCKER_NAME_PREFIX + ContainerID.
    //
    // To be backward compatible during upgrade, we still have to
    // support all formats.
    if (!strings::contains(name.get(), DOCKER_NAME_SEPERATOR)) {
      ContainerID id;
      id.set_value(name.get());
      containerId = id;
    } else {
      vector<string> parts = strings::split(name.get(), DOCKER_NAME_SEPERATOR);
      if (parts.size() == 2 || parts.size() == 3) {
        ContainerID id;
        id.set_value(parts[1]);
        containerId = id;
      }
    }

    // Check if id is a valid UUID.
    if (containerId.isSome()) {
      Try<id::UUID> uuid = id::UUID::fromString(containerId->value());
      if (uuid.isError()) {
        return None();
      }
    }
  }

  return containerId;
}


Try<DockerContainerizer*> DockerContainerizer::create(