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efd44de1b7
Support services with scale > 1 for the tar watch sync. Add a "lossy" multi-writer specific to pipes that writes the tar data to each `io.PipeWriter`, which is connected to `stdin` for the `tar` process being exec'd in the container. The data is written serially to each writer. This could be adjusted to do concurrent writes but that will rapidly increase the I/O load, so is not done here - in general, 99% of the time you'll be developing (and thus using watch/sync) with a single replica of a service. If a write fails, the corresponding `io.PipeWriter` is removed from the active set and closed with an error. This means that a single container copy failing won't stop writes to the others that are succeeding. Of course, they will be in an inconsistent state afterwards still, but that's a different problem. Signed-off-by: Milas Bowman <milas.bowman@docker.com>