docker/fig — pull request #516 by vizowl (2014-10-03 02:34:02+00:00)
Title: Add an explicit no-op option for minimal containers that do not have echo

In order to support data only volumes using minimal images #514 I have added an option that allows a no-op command to be explicitly specified - currently it is assumed to be `echo` which isn't necessarily available on a minimal image.

I have added a test and updated the documentation.

I am concerned that this approach essentially exposes an internal feature ...