GLExec TransientPilotJobs

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When you use glexec with transient directories and input sandboxes, it's important that you create a writable directory for your target job, and you do this in a safe and portable way.

In general, the setup of the batch system and OS at a site does not guarantee that the pilot job and the target user share a common group, even though in practice the 'top-level' VO group will usually be in common. However, it's not easy to identity this most-generic group. In these cases, you need to do two things:

  • Create a temporary directory for the target job using glexec. We provide a proof-of-principle implementation on how to create such a directory, and clean up after yourself at It will usually be inside a temporary, transient area specific to the pilot job.
  • ensure that this directory is reachable for the target job. This may mean making the 'upstream' directory traversable (not but necessarily readable) by the world.