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0306a41909
This addresses a subtle deadlock where an error during a copy prevented pipe closure to propagate correctly. By closing down the read end of the pipe rather than the write end, the waiting writer is properly signaled. A nice side-effect of this change is that errors encountered by io.Copy are now propagated to the verifier's Write method. A test to ensure validation errors for unsupported digest types has been added, as well. Signed-off-by: Stephen J Day <stephen.day@docker.com>