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fetch-pack: add refetch 

Allow a "refetch" where the contents of the local object store are
ignored and a full fetch is performed, not attempting to find or
negotiate common commits with the remote.

A key use case is to apply a new partial clone blob/tree filter and
refetch all the associated matching content, which would otherwise not
be transferred when the commit objects are already present locally.

Signed-off-by: Robert Coup <robert@coup.net.nz>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Robert Coup 2022-03-28 14:02:06 +00:00 committed by Junio C Hamano
parent 1836836593
commit 4dfd0925cb
2 changed files with 30 additions and 17 deletions
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46
fetch-pack.c
View File

@ -312,19 +312,21 @@ static int find_common(struct fetch_negotiator *negotiator,
const char *remote_hex;
struct object *o;
/*
* If that object is complete (i.e. it is an ancestor of a
* local ref), we tell them we have it but do not have to
* tell them about its ancestors, which they already know
* about.
*
* We use lookup_object here because we are only
* interested in the case we *know* the object is
* reachable and we have already scanned it.
*/
if (((o = lookup_object(the_repository, remote)) != NULL) &&
(o->flags & COMPLETE)) {
continue;
if (!args->refetch) {
/*
* If that object is complete (i.e. it is an ancestor of a
* local ref), we tell them we have it but do not have to
* tell them about its ancestors, which they already know
* about.
*
* We use lookup_object here because we are only
* interested in the case we *know* the object is
* reachable and we have already scanned it.
*/
if (((o = lookup_object(the_repository, remote)) != NULL) &&
(o->flags & COMPLETE)) {
continue;
}
}
remote_hex = oid_to_hex(remote);
@ -692,6 +694,9 @@ static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
int old_save_commit_buffer = save_commit_buffer;
timestamp_t cutoff = 0;
if (args->refetch)
return;
save_commit_buffer = 0;
trace2_region_enter("fetch-pack", "parse_remote_refs_and_find_cutoff", NULL);
@ -1028,7 +1033,11 @@ static struct ref *do_fetch_pack(struct fetch_pack_args *args,
struct fetch_negotiator *negotiator;
negotiator = &negotiator_alloc;
fetch_negotiator_init(r, negotiator);
if (args->refetch) {
fetch_negotiator_init_noop(negotiator);
} else {
fetch_negotiator_init(r, negotiator);
}
sort_ref_list(&ref, ref_compare_name);
QSORT(sought, nr_sought, cmp_ref_by_name);
@ -1121,7 +1130,7 @@ static struct ref *do_fetch_pack(struct fetch_pack_args *args,
mark_complete_and_common_ref(negotiator, args, &ref);
filter_refs(args, &ref, sought, nr_sought);
if (everything_local(args, &ref)) {
if (!args->refetch && everything_local(args, &ref)) {
packet_flush(fd[1]);
goto all_done;
}
@ -1587,7 +1596,10 @@ static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
struct strvec index_pack_args = STRVEC_INIT;
negotiator = &negotiator_alloc;
fetch_negotiator_init(r, negotiator);
if (args->refetch)
fetch_negotiator_init_noop(negotiator);
else
fetch_negotiator_init(r, negotiator);
packet_reader_init(&reader, fd[0], NULL, 0,
PACKET_READ_CHOMP_NEWLINE |
@ -1613,7 +1625,7 @@ static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
/* Filter 'ref' by 'sought' and those that aren't local */
mark_complete_and_common_ref(negotiator, args, &ref);
filter_refs(args, &ref, sought, nr_sought);
if (everything_local(args, &ref))
if (!args->refetch && everything_local(args, &ref))
state = FETCH_DONE;
else
state = FETCH_SEND_REQUEST;

1
fetch-pack.h
View File

@ -42,6 +42,7 @@ struct fetch_pack_args {
unsigned update_shallow:1;
unsigned reject_shallow_remote:1;
unsigned deepen:1;
unsigned refetch:1;
/*
* Indicate that the remote of this request is a promisor remote. The