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sha1-file: support OBJECT_INFO_FOR_PREFETCH 

Teach oid_object_info_extended() to support a new flag that inhibits
fetching of missing objects. This is equivalent to setting
fetch_is_missing to 0, calling oid_object_info_extended(), then setting
fetch_if_missing to whatever it was before. Update unpack-trees.c to use
this new flag instead of repeatedly setting fetch_if_missing.

This new flag complicates things slightly in that there are now 2 ways
to do the same thing. But this eliminates the need to repeatedly set a
global variable, and more importantly, allows prefetching to be done in
parallel (in the future); hence, this patch.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Tan 2019-03-29 14:39:27 -07:00 committed by Junio C Hamano
parent 041f5ea1cf
commit 0f4a4fb1c4
3 changed files with 17 additions and 9 deletions
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6
object-store.h
View File

@ -280,6 +280,12 @@ struct object_info {
#define OBJECT_INFO_QUICK 8
/* Do not check loose object */
#define OBJECT_INFO_IGNORE_LOOSE 16
/*
* Do not attempt to fetch the object if missing (even if fetch_is_missing is
* nonzero). This is meant for bulk prefetching of missing blobs in a partial
* clone. Implies OBJECT_INFO_QUICK.
*/
#define OBJECT_INFO_FOR_PREFETCH (32 + OBJECT_INFO_QUICK)
int oid_object_info_extended(struct repository *r,
const struct object_id *,

3
sha1-file.c
View File

@ -1370,7 +1370,8 @@ int oid_object_info_extended(struct repository *r, const struct object_id *oid,
/* Check if it is a missing object */
if (fetch_if_missing && repository_format_partial_clone &&
!already_retried && r == the_repository) {
!already_retried && r == the_repository &&
!(flags & OBJECT_INFO_FOR_PREFETCH)) {
/*
* TODO Investigate having fetch_object() return
* TODO error/success and stopping the music here.

17
unpack-trees.c
View File

@ -404,20 +404,21 @@ static int check_updates(struct unpack_trees_options *o)
* below.
*/
struct oid_array to_fetch = OID_ARRAY_INIT;
int fetch_if_missing_store = fetch_if_missing;
fetch_if_missing = 0;
for (i = 0; i < index->cache_nr; i++) {
struct cache_entry *ce = index->cache[i];
if ((ce->ce_flags & CE_UPDATE) &&
!S_ISGITLINK(ce->ce_mode)) {
if (!has_object_file(&ce->oid))
oid_array_append(&to_fetch, &ce->oid);
}
if (!(ce->ce_flags & CE_UPDATE) ||
S_ISGITLINK(ce->ce_mode))
continue;
if (!oid_object_info_extended(the_repository, &ce->oid,
NULL,
OBJECT_INFO_FOR_PREFETCH))
continue;
oid_array_append(&to_fetch, &ce->oid);
}
if (to_fetch.nr)
fetch_objects(repository_format_partial_clone,
to_fetch.oid, to_fetch.nr);
fetch_if_missing = fetch_if_missing_store;
oid_array_clear(&to_fetch);
}
for (i = 0; i < index->cache_nr; i++) {