Comment (by Roland Haas):

As pointed out in https://bitbucket.org/einsteintoolkit/tickets/issues/1721/simfactorys-test-mechanism-should-use?iframe=true&spa=0#comment-50394399 not all clusters allow access to the file system that contains the source code from a running job.

So copies are required there.

To avoid the complication of a cache or determining if symbolic links would work, I suggest we keep the copying.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/1721/simfactorys-test-mechanism-should-use