func makeContainerLogMount(opts *kubecontainer.RunContainerOptions, container *api.Container) (*kubecontainer.Mount, error) {
if opts.PodContainerDir == "" || container.TerminationMessagePath == "" {
return nil, nil
}
// In docker runtime, the container log path contains the container ID.
// However, for rkt runtime, we cannot get the container ID before the
// the container is launched, so here we generate a random uuid to enable
// us to map a container's termination message path to an unique log file
// on the disk.
randomUID := util.NewUUID()
containerLogPath := path.Join(opts.PodContainerDir, string(randomUID))
fs, err := os.Create(containerLogPath)
if err != nil {
return nil, err
}
if err := fs.Close(); err != nil {
return nil, err
}
mnt := &kubecontainer.Mount{
// Use a random name for the termination message mount, so that
// when a container restarts, it will not overwrite the old termination
// message.
Name: fmt.Sprintf("termination-message-%s", randomUID),
ContainerPath: container.TerminationMessagePath,
HostPath: containerLogPath,
ReadOnly: false,
}
opts.Mounts = append(opts.Mounts, *mnt)
return mnt, nil
}
