[Users] Migration from SVN to Git

[Erik Schnetter]

On Tue, Aug 19, 2014 at 4:25 PM, Roland Haas <roland.haas at physics.gatech.edu
> wrote:

> Hello all,
>
> >>> I might be wrong, but didn't we want GRHydro+GRHydro_Initdata as one
> >>> "GRHydro" arrangement?
> >> I don't recall this decision. Do you have a pointer to the discussion?
> There are notes on the wiki in the "repository transition" page, the
> closest thing to discussion notes are likely the minutes from 03/18/2014
> (BTW: any progress on getting links to the archived email into the
> mailing list email footers? This would be really helpful and there were
> some suggestions on how to make this work on the trac ticket).
>
> GRHydro_InitData would be treated as a "Test" thorn (not ID in there is
> actually used for a real simulation) and thus would be "related" to
> GRHydro. The two thorns are also very tightly coupled since
> GRHydro_InitData directly calls some of GRHydro's routines.
>

I suggest to keep GRHydro in EinsteinEvolve, and to either have
GRHydro_InitData there as well, or maybe to move it to EinsteinTest, and
maybe rename it to GRHydro_Test.

-erik

>> I know that it is difficult to place GRHydro_InitData into a particular
> > arrangement, but at the same time, reducing the number of arrangements is
> > also important.
> >
> > As far as I remember this was suggested because GRHydro is internally a
> git
> > repository, so it doesn't seem sensible to convert it to separate svn
> > repositories only to convert back to git and merge again. I think the
> > suggestion was to instead just directly use the GRHydro git repository.
> As far as I know there is no GRHydro git repository. The svn repo in the
> ET is the official GRHydro thorn.
>
> There *is* a version of GRHydro that is in a git repository, namely the
> version in Caltech's Zelmani repository. This is actually where most
> development happens and for a long time I regularly would sync (by hand
> by cherry picking commits) the two repositories. Since I have not done
> so for a bit, I don't know how much they differ by now.
>
> Zelmani contains other things than GRHydro (eg a copy of RNSID) so it
> cannot be made public in its entirety. Also the version of GRHydro in
> Zelmani is "experimental" and contain some hacks the were rejected from
> the svn repo (and it *will* fail often since all of Caltech's
> development happens there and the group tries many things).
>
> So I would actually use the current svn repo as a starting point, then
> given that we may only want a single repo for all of it (which may not
> be feasible since eg some branches in Zelmani are used to provide a
> consistent set of thorns from *multiple* external repositories [eg
> McLachlan, LocalInterp]) make some branches for the Caltech and other
> stuff that will never make it into master.
>
> Given the amount of changes and experiments going on in Zelmani it is (I
> suspect) not possible to have a situation where before an ET release we
> "clean up" and "safeguard" experiments in GRHydro and make the result
> the released version (this would introduce many half-baked things into
> the released version).
>
> Yours,
> Roland
>
> --
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>
>
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-- 
Erik Schnetter <schnetter at cct.lsu.edu>
http://www.perimeterinstitute.ca/personal/eschnetter/
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