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Improve default handling of Singularity volumes. #4180
My understanding is that unlike Docker, Singularity doesn't allow a subdirectory to be mounted rw and its parent to be mounted ro - it will just be ro. This PR adjusts the default volume handling for Singularity to intelligently fallback to mounting parent directories as rw if their child directories are listed as being mounted rw.
Ping @bgruening - is the above a description correct and does this approach work for you?