Read log status.

Keep polling a condition func until it return a message or an error PollForever always wait interval PollForever will keep polling forever, no timeout.

PollRetry repeats running condition functions with a backoff until it runs successfully Or it already retried multiple times which is set in config The backoff time will be retry * interval.

Keep polling a condition func until timeout or a message/error is returned.

Retry command util reach the maximum try out count.

Retry command forever.

Set log status.

wait on exec command finished or timeout.

Run condition in goroutine, wait for condition's return until timeout If timeout, return ErrTimeOut If message received from condition, return message.