[ET Trac] [Einstein Toolkit] #1897: MPI thorn builds when it shouldn't

[Einstein Toolkit]

#1897: MPI thorn builds when it shouldn't
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  Reporter:  hinder                 |       Owner:                     
      Type:  defect                 |      Status:  review             
  Priority:  blocker                |   Milestone:  ET_2016_05         
 Component:  EinsteinToolkit thorn  |     Version:  development version
Resolution:                         |    Keywords:  MPI                
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Comment (by knarf):

 Any new ideas about how to fix this?

 Trying to summarize, we need:

 a) a file that indicates to Cactus that something in the library
 configuration changed, especially after a re-build of the library by
 Cactus. So far, this is called 'done'.

 b) a file that indicates that the library needs to be build. This is
 thorn-internal, and only passes that information from detect.sh to
 build.sh.

 c) a file that 'saves' the last build date, to be able to skip build if
 build.sh wasn't updated (no new version available). This is also thorn-
 internal.

 Initially, I tried to combine b) and c) into one file, 'available', but
 that was shown to be not sufficient. As it stands now, we don't have a
 solution which would combine b) and c) into one file. It would be nice to
 have only two files (simpler), but in absence of a solution using only two
 files, but the need for a solution in general, I only see one way forward:
 three files.

 a) 'done': would not change from current behavior.
    Created/removed by detect.sh (but not updated),
 created/removed(?)/updated by build (if run).
 b) 'build_not_needed' (?): created/updated/removed by detect.sh
 c) 'last_build' (?): created/updated by build.sh

 If b) exists after detection, build doesn't need to run. If c) is newer
 than build.sh, build doesn't need to run. Otherwise: build and update c).

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1897#comment:14>
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