[ET Trac] [Einstein Toolkit] #1359: add "read from file" option ot HydroBase's initial_data options

[Einstein Toolkit]

#1359: add "read from file" option ot HydroBase's initial_data options
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  Reporter:  rhaas                  |       Owner:             
      Type:  enhancement            |      Status:  reviewed_ok
  Priority:  minor                  |   Milestone:             
 Component:  EinsteinToolkit thorn  |     Version:             
Resolution:                         |    Keywords:  HydroBase  
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Comment (by knarf):

 Oh, I didn't think of that. Yes, this is delicate - both thorns don't know
 of another, but in this case in theory should. Could we add the patch as
 proposed, but also add a runtime check that looks for an active IOUtils
 thorn, and checks at least that filereader_ID_vars isn't empty - to avoid
 both abusing the parameter and accidental usage?

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1359#comment:7>
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