> But what to delta against what else is determined by the pathname
> info, which is now lost by enumerating objects without tree/history
> walking. By giving phoney pathnames to objects while enumerating
> them in offset order and giving similar pathnames to objects closer
> to each other, I was hoping that better bases will likely to be in
> the same window. The order in which objects are prepared and fed to
> try_delta() is "group by type, and then sort by path-hash (major
> key) and size (descending order, used as minor key)", so that
> the largest among similarly named blobs is stored as base and other
> blobs with similar name try to become delta against that one.
Thanks for the patient explanation - I think I see it now. If we
enumerate in pack order and pass "<sha-1> <fake-name>" instead of
"<sha-1>" to pack-objects in such a way that we make pack-objects sort
by {type -> pack-order -> size} instead of {type -> size}, we can
hopefully get better deltas. I'll write a NEEDSWORK similar to this.
I'll send a reroll later today.
