Merge branch 'jt/diff-lazy-fetch-submodule-fix'

On-demand object fetching in lazy clone incorrectly tried to fetch
commits from submodule projects, while still working in the
superproject, which has been corrected.

* jt/diff-lazy-fetch-submodule-fix:
  diff: skip GITLINK when lazy fetching missing objs

diff.c

@@ -6512,6 +6512,7 @@ static void add_if_missing(struct repository *r,
 			   const struct diff_filespec *filespec)
 {
 	if (filespec && filespec->oid_valid &&
+	    !S_ISGITLINK(filespec->mode) &&
 	    oid_object_info_extended(r, &filespec->oid, NULL,
 				     OBJECT_INFO_FOR_PREFETCH))
 		oid_array_append(to_fetch, &filespec->oid);

t/t4067-diff-partial-clone.sh

@@ -75,6 +75,37 @@ test_expect_success 'diff skips same-OID blobs' '
 	! grep "want $(cat hash-b)" trace
 '
 
+test_expect_success 'when fetching missing objects, diff skips GITLINKs' '
+	test_when_finished "rm -rf sub server client trace" &&
+
+	test_create_repo sub &&
+	test_commit -C sub first &&
+
+	test_create_repo server &&
+	echo a >server/a &&
+	git -C server add a &&
+	git -C server submodule add "file://$(pwd)/sub" &&
+	git -C server commit -m x &&
+
+	test_commit -C server/sub second &&
+	echo another-a >server/a &&
+	git -C server add a sub &&
+	git -C server commit -m x &&
+
+	test_config -C server uploadpack.allowfilter 1 &&
+	test_config -C server uploadpack.allowanysha1inwant 1 &&
+	git clone --bare --filter=blob:limit=0 "file://$(pwd)/server" client &&
+
+	echo a | git hash-object --stdin >hash-old-a &&
+	echo another-a | git hash-object --stdin >hash-new-a &&
+
+	# Ensure that a and another-a are fetched, and check (by successful
+	# execution of the diff) that no invalid OIDs are sent.
+	GIT_TRACE_PACKET="$(pwd)/trace" git -C client diff HEAD^ HEAD &&
+	grep "want $(cat hash-old-a)" trace &&
+	grep "want $(cat hash-new-a)" trace
+'
+
 test_expect_success 'diff with rename detection batches blobs' '
 	test_when_finished "rm -rf server client trace" &&