fetch-pack: put shallow info in output parameter

Expand the transport fetch method signature, by adding an output
parameter, to allow transports to return information about the refs they
have fetched.  Then communicate shallow status information through this
mechanism instead of by modifying the input list of refs.

This does require clients to sometimes generate the ref map twice: once
from the list of refs provided by the remote (as is currently done) and
potentially once from the new list of refs that the fetch mechanism
provides.

Signed-off-by: Brandon Williams <bmwill@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 8 insertions, 7 deletions

diff --git a/fetch-pack.c b/fetch-pack.c
index a320ce9..73890b8 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -1470,12 +1470,13 @@ static int remove_duplicates_in_refs(struct ref **ref, int nr)
 }
 
 static void update_shallow(struct fetch_pack_args *args,
-			   struct ref **sought, int nr_sought,
+			   struct ref *refs,
 			   struct shallow_info *si)
 {
 	struct oid_array ref = OID_ARRAY_INIT;
 	int *status;
 	int i;
+	struct ref *r;
 
 	if (args->deepen && alternate_shallow_file) {
 		if (*alternate_shallow_file == '\0') { /* --unshallow */
@@ -1517,8 +1518,8 @@ static void update_shallow(struct fetch_pack_args *args,
 	remove_nonexistent_theirs_shallow(si);
 	if (!si->nr_ours && !si->nr_theirs)
 		return;
-	for (i = 0; i < nr_sought; i++)
-		oid_array_append(&ref, &sought[i]->old_oid);
+	for (r = refs; r; r = r->next)
+		oid_array_append(&ref, &r->old_oid);
 	si->ref = &ref;
 
 	if (args->update_shallow) {
@@ -1552,12 +1553,12 @@ static void update_shallow(struct fetch_pack_args *args,
 	 * remote is also shallow, check what ref is safe to update
 	 * without updating .git/shallow
 	 */
-	status = xcalloc(nr_sought, sizeof(*status));
+	status = xcalloc(ref.nr, sizeof(*status));
 	assign_shallow_commits_to_refs(si, NULL, status);
 	if (si->nr_ours || si->nr_theirs) {
-		for (i = 0; i < nr_sought; i++)
+		for (r = refs, i = 0; r; r = r->next, i++)
 			if (status[i])
-				sought[i]->status = REF_STATUS_REJECT_SHALLOW;
+				r->status = REF_STATUS_REJECT_SHALLOW;
 	}
 	free(status);
 	oid_array_clear(&ref);
@@ -1591,7 +1592,7 @@ struct ref *fetch_pack(struct fetch_pack_args *args,
 		ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
 					&si, pack_lockfile);
 	reprepare_packed_git(the_repository);
-	update_shallow(args, sought, nr_sought, &si);
+	update_shallow(args, ref_cpy, &si);
 	clear_shallow_info(&si);
 	return ref_cpy;
 }