On Fri, Aug 9, 2013 at 12:10 AM, Junio C Hamano <gits...@pobox.com> wrote:
> Duy Nguyen <pclo...@gmail.com> writes:
>> I fail to see the point here. There are two different things: what we
>> want to send, and what we can make deltas against. Shallow boundary
>> affects the former. What the recipient has affects latter. What is the
>> twist about?
> do_rev_list() --> mark_edges_uninteresting() --> show_edge() callchain
> that eventually does this:
> static void show_edge(struct commit *commit)
> {
>         fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
> }
> was what I had in mind.

Now I see. Thanks.

mark_edges_uninteresting() actually calls
mark_edge_parents_uninteresting(), which calls show_edge(). The middle
function is important because after calculating new depth, upload-pack
calls register_shallow() for all both old and new shallow roots and
those commits will have their 'parents' pointer set to NULL, which
renders mark_edge_parents_uninteresting() no-op. So show_edge() is
never called on shallow points' parents.

>> As for considering objects before shallow boundary uninteresting, I
>> have a plan for it: kill upload-pack.c:do_rev_list(). The function is
>> created to make a cut at shallow boundary,...
> Hmph, that function is not primarily about shallow boundary but does
> all packing in general.
> The edge hinting in there is for thin transfer where the sender
> sends deltas against base objects that are known to be present in
> the receiving repository, without sending the base objects.

OK but edge hinting is the same in pack-objects.c:get_object_list() so
the plan might still work, right? I still need to study about
extra_edge_obj in upload-pack.c though. That's something knowledge
that pack-objects won't have.
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