[Halld-offline] Proposal for merging dirc_commissioning_2018 branches into repositories

[Justin Stevens]

Hi All,

As we discussed at one of the recent software meetings we’re nearing the start of DIRC commissioning and we need to get the developed software onto the master branches of our repositories: halld_recon, halld_sim, hdds, hdgeant4, and gluex_root_analysis from the branches they’re on now (dirc_commissioning_2018).  There’s a lot of new code, but I’ve tested the current branches and (as a unit) they’re still compatible with analyzing EVIO and REST files from previous RunPeriods.  The additions to existing libraries and some of the new options are summarized at https://halldweb.jlab.org/wiki/index.php/DIRC_Software_Overview <https://halldweb.jlab.org/wiki/index.php/DIRC_Software_Overview>.

The updated repositories are also backwards compatible with older versions of the software.  There are compiler flags in halld_sim and hdgeant4 which check for the relevant hit object headers in halld_recon, and if they’re not found these sections of the repositories are skipped.  As a concrete example, if you’re continuing to use the halld_recon version for the Spring 2017 REST production ver03, you can safely use the new halld_sim and hdgeant4 after the DIRC is included.

To give a concrete timeline, I would like to have the DIRC software on the master branch next week.  So if you have questions or concerns please let me know, otherwise I plan to submit pull requests for each repository on Wednesday 1/9.

-Justin
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