On Sun, Aug 05, 2012 at 11:38:12AM +0200, Michael Haggerty wrote:

> I have some other crazy ideas for making the concept even more powerful:
> * Support remote alternate repositories.  Local repository obtains
> missing objects from the remote as needed.  This would probably be
> insanely inefficient without also supporting...
> * Lazy copying of "borrowed" objects to the local repository.  Any
> object fetched from the alternate object store is copied to the local
> object store.
> Together, I think that these two features would give fully-functional
> shallow clones.

You might be interested in looking at my rough (_very_ rough) experiment
with object db "hooks":


The basic idea is to have helper programs that basically have two
commands: give a list of sha1s you can provide, and fetch a specific
object by sha1. That's enough for the low levels of git to fall-back to
a helper on an object lookup failure, and copy the object to a local
cache. Managing the cache could be done externally by helper-specific

Sorry, there's no documentation on the format or behavior, and most of
the changes are in one big patch. If you're interested and find it
unreadable, I can try to clean it up.

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