commit bcb68bff80eab46f9d5f367555da803e61d3d7c8
author Junio C Hamano <gitster@pobox.com> Tue Sep 22 12:36:28 2020 -0700
committer Junio C Hamano <gitster@pobox.com> Tue Sep 22 12:36:28 2020 -0700
tree 65f0ad5f0305922a7719313b9285fab4861fdc1c
parent 385c171a018f2747b329bcfa6be8eda1709e5abd
parent 7ea0c2f44dae65630e53bf36000933f8042eecda

Merge branch 'os/fetch-submodule-optim'

Optimization around submodule handling.

* os/fetch-submodule-optim:
  fetch: do not look for submodule changes in unchanged refs

builtin/fetch.c

diff --git a/builtin/fetch.c b/builtin/fetch.c
index c555836..76a4d14 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -966,8 +966,10 @@
 				ref->force = rm->peer_ref->force;
 			}
 
-			if (recurse_submodules != RECURSE_SUBMODULES_OFF)
+			if (recurse_submodules != RECURSE_SUBMODULES_OFF &&
+			    (!rm->peer_ref || !oideq(&ref->old_oid, &ref->new_oid))) {
 				check_for_new_submodule_commits(&rm->old_oid);
+			}
 
 			if (!strcmp(rm->name, "HEAD")) {
 				kind = "";