Hey guys! I wanted to discuss image fetch policy which you have here : https://github.com/rkt/rkt/blob/548c7d0a37a0d291a9732c7851a2fd45d37dcd00/rkt/image/common.go#L103-L109 Basically you fetch image and then do nothing until it will be expired. I would like to propose you another scheme and ready to prepare pull request for this if you think the same. In my opinion it would be better to store Etag in a file after image fetch and compare it everytime with one located on a storage server during fetch operations. This can be useful if image have 2-3 or more dependencies or some images do not require their version update due to any reason.
Best Regards, Serghei
