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fetch-pack: support negotiation tip whitelist

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During negotiation, fetch-pack eventually reports as "have" lines all
commits reachable from all refs. Allow the user to restrict the commits
sent in this way by providing a whitelist of tips; only the tips
themselves and their ancestors will be sent.

Both globs and single objects are supported.

This feature is only supported for protocols that support connect or
stateless-connect (such as HTTP with protocol v2).

This will speed up negotiation when the repository has multiple
relatively independent branches (for example, when a repository
interacts with multiple repositories, such as with linux-next [1] and
torvalds/linux [2]), and the user knows which local branch is likely to
have commits in common with the upstream branch they are fetching.

[1] https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next/
[2] https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux/

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Tan
2018-07-02 15:39:44 -07:00
committed by Junio C Hamano
parent ec06283844
commit 3390e42adb
8 changed files with 176 additions and 2 deletions
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7
fetch-pack.h
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@ -16,6 +16,13 @@ struct fetch_pack_args {
const struct string_list *deepen_not;
struct list_objects_filter_options filter_options;
const struct string_list *server_options;
/*
* If not NULL, during packfile negotiation, fetch-pack will send "have"
* lines only with these tips and their ancestors.
*/
const struct oid_array *negotiation_tips;
unsigned deepen_relative:1;
unsigned quiet:1;
unsigned keep_pack:1;