Teach "fetch-pack" not to lazy fetch whenever iterating over refs. This
is done by using the raw form of ref iteration and by dereferencing tags
ourselves.
Signed-off-by: Jonathan Tan <jonathantanmy@xxxxxxxxxx>
---
fetch-pack.c | 79 ++++++++++++++++++++++------------------
t/t5616-partial-clone.sh | 20 ++++++++++
2 files changed, 64 insertions(+), 35 deletions(-)
diff --git a/fetch-pack.c b/fetch-pack.c
index 80fb3bd899..707bbc31fd 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -108,24 +108,48 @@ static void for_each_cached_alternate(struct fetch_negotiator *negotiator,
cb(negotiator, cache.items[i]);
}
+static struct commit *deref_without_lazy_fetch(const struct object_id *oid,
+ int mark_tags_complete)
+{
+ enum object_type type;
+ struct object_info info = { .typep = &type };
+
+ while (1) {
+ if (oid_object_info_extended(the_repository, oid, &info,
+ OBJECT_INFO_SKIP_FETCH_OBJECT | OBJECT_INFO_QUICK))
+ return NULL;
+ if (type == OBJ_TAG) {
+ struct tag *tag = (struct tag *)
+ parse_object(the_repository, oid);
+
+ if (!tag->tagged)
+ return NULL;
+ if (mark_tags_complete)
+ tag->object.flags |= COMPLETE;
+ oid = &tag->tagged->oid;
+ } else {
+ break;
+ }
+ }
+ if (type == OBJ_COMMIT)
+ return (struct commit *) parse_object(the_repository, oid);
+ return NULL;
+}
+
static int rev_list_insert_ref(struct fetch_negotiator *negotiator,
- const char *refname,
const struct object_id *oid)
{
- struct object *o = deref_tag(the_repository,
- parse_object(the_repository, oid),
- refname, 0);
-
- if (o && o->type == OBJ_COMMIT)
- negotiator->add_tip(negotiator, (struct commit *)o);
+ struct commit *c = deref_without_lazy_fetch(oid, 0);
+ if (c)
+ negotiator->add_tip(negotiator, c);
return 0;
}
static int rev_list_insert_ref_oid(const char *refname, const struct object_id *oid,
int flag, void *cb_data)
{
- return rev_list_insert_ref(cb_data, refname, oid);
+ return rev_list_insert_ref(cb_data, oid);
}
enum ack_type {
@@ -201,7 +225,7 @@ static void send_request(struct fetch_pack_args *args,
static void insert_one_alternate_object(struct fetch_negotiator *negotiator,
struct object *obj)
{
- rev_list_insert_ref(negotiator, NULL, &obj->oid);
+ rev_list_insert_ref(negotiator, &obj->oid);
}
#define INITIAL_FLUSH 16
@@ -230,13 +254,12 @@ static void mark_tips(struct fetch_negotiator *negotiator,
int i;
if (!negotiation_tips) {
- for_each_ref(rev_list_insert_ref_oid, negotiator);
+ for_each_rawref(rev_list_insert_ref_oid, negotiator);
return;
}
for (i = 0; i < negotiation_tips->nr; i++)
- rev_list_insert_ref(negotiator, NULL,
- &negotiation_tips->oid[i]);
+ rev_list_insert_ref(negotiator, &negotiation_tips->oid[i]);
return;
}
@@ -503,21 +526,11 @@ static struct commit_list *complete;
static int mark_complete(const struct object_id *oid)
{
- struct object *o = parse_object(the_repository, oid);
-
- while (o && o->type == OBJ_TAG) {
- struct tag *t = (struct tag *) o;
- if (!t->tagged)
- break; /* broken repository */
- o->flags |= COMPLETE;
- o = parse_object(the_repository, &t->tagged->oid);
- }
- if (o && o->type == OBJ_COMMIT) {
- struct commit *commit = (struct commit *)o;
- if (!(commit->object.flags & COMPLETE)) {
- commit->object.flags |= COMPLETE;
- commit_list_insert(commit, &complete);
- }
+ struct commit *commit = deref_without_lazy_fetch(oid, 1);
+
+ if (commit && !(commit->object.flags & COMPLETE)) {
+ commit->object.flags |= COMPLETE;
+ commit_list_insert(commit, &complete);
}
return 0;
}
@@ -702,7 +715,7 @@ static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
*/
trace2_region_enter("fetch-pack", "mark_complete_local_refs", NULL);
if (!args->deepen) {
- for_each_ref(mark_complete_oid, NULL);
+ for_each_rawref(mark_complete_oid, NULL);
for_each_cached_alternate(NULL, mark_alternate_complete);
commit_list_sort_by_date(&complete);
if (cutoff)
@@ -716,16 +729,12 @@ static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator,
*/
trace2_region_enter("fetch-pack", "mark_common_remote_refs", NULL);
for (ref = *refs; ref; ref = ref->next) {
- struct object *o = deref_tag(the_repository,
- lookup_object(the_repository,
- &ref->old_oid),
- NULL, 0);
+ struct commit *c = deref_without_lazy_fetch(&ref->old_oid, 0);
- if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
+ if (!c || !(c->object.flags & COMPLETE))
continue;
- negotiator->known_common(negotiator,
- (struct commit *)o);
+ negotiator->known_common(negotiator, c);
}
trace2_region_leave("fetch-pack", "mark_common_remote_refs", NULL);
diff --git a/t/t5616-partial-clone.sh b/t/t5616-partial-clone.sh
index 8a27452a51..e53492d595 100755
--- a/t/t5616-partial-clone.sh
+++ b/t/t5616-partial-clone.sh
@@ -384,6 +384,26 @@ test_expect_success 'fetch lazy-fetches only to resolve deltas, protocol v2' '
grep "want $(cat hash)" trace
'
+test_expect_success 'fetch does not lazy-fetch missing targets of its refs' '
+ rm -rf server client trace &&
+
+ test_create_repo server &&
+ test_config -C server uploadpack.allowfilter 1 &&
+ test_config -C server uploadpack.allowanysha1inwant 1 &&
+ test_commit -C server foo &&
+
+ git clone --filter=blob:none "file://$(pwd)/server" client &&
+ # Make all refs point to nothing by deleting all objects.
+ rm client/.git/objects/pack/* &&
+
+ test_commit -C server bar &&
+ GIT_TRACE_PACKET="$(pwd)/trace" git -C client fetch \
+ --no-tags --recurse-submodules=no \
+ origin refs/tags/bar &&
+ FOO_HASH=$(git -C server rev-parse foo) &&
+ ! grep "want $FOO_HASH" trace
+'
+
# The following two tests must be in this order. It is important that
# the srv.bare repository did not have tags during clone, but has tags
# in the fetch.
--
2.28.0.236.gb10cc79966-goog
