[racket-dev] Planet 2 Beta Release

On Sat, Dec 8, 2012 at 9:27 PM, Eli Barzilay <eli at barzilay.org> wrote:

> 30 minutes ago, Jay McCarthy wrote:
> > On Sat, Dec 8, 2012 at 8:29 PM, Eli Barzilay <eli at barzilay.org> wrote:
> >
> >     > One other thing that I think is important in a migration path is
> >     > keeping any modification made to the source of the packages that
> are
> >     > already installed.
> >
> >     Yeah -- and IIUC, the difference between the two installations is
> >     where the packages get installed is where the compiled files are, so
> >     the sources are the same.  At least I *hope* that that's how it is,
> >     otherwise it's back to the whole planet "cache" things, which IMO was
> >     a major mistake.
> >
> > They are in the same place. However, I thought the whole premise of
> > this proposed behavior is that the package won't work in the new
> > version of Racket, so certainly the package system can't be
> > responsible for doing a merge your local changes and whatever the
> > updated version of the package needs.
>
> I'm not following that -- the compiled files and the sources are in
> the same place?  If so then it makes the whole migration thing kind of
> impossible with local changes, no?  (And I wasn't thinking about
> merging, just reusing the same sources.)


:) Now I'm not following you.

If you have a package named P that has a module A/B/C.rkt then on your disk
is in:

~/.racket/$version/pkgs/P/A/B/C.rkt

with its compiled code in:

~/.racket/$version/pkgs/P/A/B/compiled/C_rkt.zo

My idea of "raco pkg migrate" is just to get a list of the packages that
you have installed and re-install them. I think if we assume that Racket
versions will break package P then those same problems will prevent you
from keeping local changes; especially if the package system isn't
responsible for running merge, which it clearly shouldn't be. (Now, I don't
think that's a reasonable assumption, i.e. I think version-less should be
the default, but I've clearly been out-voted.)

Jay

-- 
Jay McCarthy <jay at cs.byu.edu>
Assistant Professor / Brigham Young University
http://faculty.cs.byu.edu/~jay

"The glory of God is Intelligence" - D&C 93
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