@matheusbsbs / matheus-bagliano / commits / 3e96c66805

partial-clone: avoid fetching when looking for objects

When using partial clone, find_non_local_tags() in builtin/fetch.c checks each remote tag to see if its object also exists locally. There is no expectation that the object exist locally, but this function nevertheless triggers a lazy fetch if the object does not exist. This can be extremely expensive when asking for a commit, as we are completely removed from the context of the non-existent object and thus supply no "haves" in the request. 6462d5eb9a (fetch: remove fetch_if_missing=0, 2019-11-05) removed a global variable that prevented these fetches in favor of a bitflag. However, some object existence checks were not updated to use this flag. Update find_non_local_tags() to use OBJECT_INFO_SKIP_FETCH_OBJECT in addition to OBJECT_INFO_QUICK. The _QUICK option only prevents repreparing the pack-file structures. We need to be extremely careful about supplying _SKIP_FETCH_OBJECT when we expect an object to not exist due to updated refs. This resolves a broken test in t5616-partial-clone.sh. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Derrick Stolee committed Feb 21, 2020 at 21:47 UTC 3e96c66805f17d7345eba4733bc80c6fe646b95f
2 files changed +6 -6
builtin/fetch.c
+5 -5
index b4c6d921d0..fd69c4f69d 100644 --- a/builtin/fetch.c +++ b/builtin/fetch.c @@ -335,6 +335,7 @@ static void find_non_local_tags(const struct ref *refs, struct string_list_item *remote_ref_item; const struct ref *ref; struct refname_hash_entry *item = NULL; + const int quick_flags = OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT; refname_hash_init(&existing_refs); refname_hash_init(&remote_refs); @@ -353,10 +354,9 @@ static void find_non_local_tags(const struct ref *refs, */ if (ends_with(ref->name, "^{}")) { if (item && - !has_object_file_with_flags(&ref->old_oid, - OBJECT_INFO_QUICK) && + !has_object_file_with_flags(&ref->old_oid, quick_flags) && !oidset_contains(&fetch_oids, &ref->old_oid) && - !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) && + !has_object_file_with_flags(&item->oid, quick_flags) && !oidset_contains(&fetch_oids, &item->oid)) clear_item(item); item = NULL; @@ -370,7 +370,7 @@ static void find_non_local_tags(const struct ref *refs, * fetch. */ if (item && - !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) && + !has_object_file_with_flags(&item->oid, quick_flags) && !oidset_contains(&fetch_oids, &item->oid)) clear_item(item); @@ -391,7 +391,7 @@ static void find_non_local_tags(const struct ref *refs, * checked to see if it needs fetching. */ if (item && - !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) && + !has_object_file_with_flags(&item->oid, quick_flags) && !oidset_contains(&fetch_oids, &item->oid)) clear_item(item);
t/t5616-partial-clone.sh
+1 -1
index 022f1018ac..da3ad4e32a 100755 --- a/t/t5616-partial-clone.sh +++ b/t/t5616-partial-clone.sh @@ -390,7 +390,7 @@ test_expect_failure 'verify fetch succeeds when asking for new tags' ' git -C tag-test -c protocol.version=2 fetch --tags origin ' -test_expect_failure 'verify fetch downloads only one pack when updating refs' ' +test_expect_success 'verify fetch downloads only one pack when updating refs' ' git clone --filter=blob:none "file://$(pwd)/srv.bare" pack-test && ls pack-test/.git/objects/pack/*pack >pack-list && test_line_count = 2 pack-list &&