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`Upload` already closes the reader returned by `compress` and the progressreader passed into it, before returning. But even so, the io.Copy inside compress' goroutine needs to attempt a read from the progressreader to notice that it's closed, and this read has a side effect of outputting a progress message. If this happens after `Upload` returns, it can result in a write to a closed channel. Change `compress` to return a channel that allows the caller to wait for its goroutine to finish before freeing any resources connected to the reader that was passed to it. Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com> Upstream-commit: e273445dd407df6803d7b80863b644a6cfa2c1f5 Component: engine