Re: git pack/unpack over bittorrent - works!

> On Thu, Sep 2, 2010 at 4:42 PM, Luke Kenneth Casson Leighton
> <luke.leighton@gmail.com>  wrote:
>> On Thu, Sep 2, 2010 at 4:33 PM, A Large Angry SCM<gitzilla@gmail.com>  wrote:
>
>> * is it possible to _make_ the repository guaranteed to produce
>> identical pack objects?
>
>   i.e. looking at these options, listed from
> Documentation/technical/protocol.txt:
>
>      00887217a7c7e582c46cec22a130adf4b9d7d950fba0 HEAD\0multi_ack
> thin-pack side-band side-band-64k ofs-delta shallow no-progress
> include-tag
>
>   is it possible to use shallow, thin-pack, side-band or side-band-64k
> to guarantee that the pack object will be identical?

>   another important question:
>
> * if after performing a "git unpack" of one pack-object, can it be
> guaranteed that performing a "git pack-object" on the *exact* same ref
> and the *exact* same object-ref, will produce the *exact* same
> pack-object that was used by "git unpack", as long as the exact same
> arguments are used?  if not, why not, and if not under _some_
> circumstances, under what circumstances _can_ the exact same
> pack-object be retrieved that was just used?

> if there is absolutely absolutely no way to guarantee that the
> pack-objects can be the same, under no circumstances or combinations
> of arguments or by forcing only compatible versions to communicate
> etc. etc., a rather awful work-around can be applied which is to share
> and permanently cache every single pack-object, rather than use what's
> gone into the repo.