On Mon, Oct 1, 2012 at 5:48 AM, Nguyen Thai Ngoc Duy <pclo...@gmail.com> wrote:
> Probably off topic. Does saving a list of missing bases in the pack
> index help storing thin packs directly? I may be missing some points
> because I don't see why thin packs cannot be stored on disk in the
> first place.

Packs are supposed to be completely self contained. We require all
delta bases to be in the pack so that we can always recover the
objects stored within it, even if there is no other pack available.
This simplifies things like git gc such that they don't need to worry
about retaining delta bases for other packs, or avoiding delta chain
cycles between packs. I have managed to create a A->B->A delta chain
once that made the repository corrupt as soon as the last non-delta
copy of A as removed. Both A and B became unreadable as A needed B
which needed A which needed B... :-(

To keep things simple and easily verified as correct, we don't allow this.
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