From: Luke Kenneth Casson Leighton <luke.leighton@gmail.com>
Date: Thu, 02 Sep 2010 13:53:54 GMT
Subject: Re: git pack/unpack over bittorrent - works!
Message-ID: <AANLkTims3F997XrCDN+rRnSPb=LFCU1_CCqTRj6oZyAg@mail.gmail.com>
In-Reply-To: <AANLkTimpE6rf0azHtrz6BFK5d7YojF+G1YuSA1gusSC=@mail.gmail.com>

>> one of the reason "commit reel" was introduced.
>
>  ah _ha_.  i need to look that up.  will get back to you.
>
>  l.
>

http://www.mail-archive.com/gittorrent@lists.utsl.gen.nz/msg00032.html

.... nnnope.  don't understand it.  at all.  there's no context.

http://www.mail-archive.com/gittorrent@lists.utsl.gen.nz/msg00003.html -->

http://gittorrent.utsl.gen.nz/rfc.html#anchor7

"Service Not Available".

greeat.

http://www.mail-archive.com/gittorrent@lists.utsl.gen.nz/msg00023.html

ah HA!
+<t hangText="References:">
+
+       The References are the Git refs of the repository being shared.
+
+</t>
+<t hangText="Commit reel offset:">
+
+       An offset into the list of all revisions sorted by their natural
+       topological order, their commit date and their SHA-1.
+
+</t>
+<t hangText="Commit reel:">
+
+       A commit reel consists of two commit reel offsets, and all the objects
+       that are reachable from the revisions between the two offsets, but
+       not the revisions after the second offset.  In Git terms, a commit
+       reel is a bundle.
+
+</t>
+<t hangText="Block:">
+
+       A block is the actual content of a commit reel, i.e. the objects.
+       In Git terms, it is a pack.
+
+</t>

oh - right.... so, translating that: the concern is not that the git
pack-objects might be different (could someone pleaaaase confirm
that!) - the concern is that the order of _unpacking_ *has* to be done
in the specific order in which they were (originally) committed.

 if that's all it is, then yes, i thought that that was plainly
obvious, and had taken it into consideration already, by creating a
virtual file which contains the order of the commits.  this is
achieved merely by making the contents of "git rev-list" available.
voila, dead-simple: you now have enough information to be able to
apply the pack objects in the right order.

l.