[PATCH v5 9/9] builtin/fetch: check for submodule updates for non branch fetches

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Gerrit, the code review tool, has a different workflow than our mailing
list based approach. Usually users upload changes to a Gerrit server and
continuous integration and testing happens by bots. Sometimes however a
user wants to checkout a change locally and look at it locally. For this
use case, Gerrit offers a command line snippet to copy and paste to your
terminal, which looks like

  git fetch https://<host>/gerrit refs/changes/<id> &&
  git checkout FETCH_HEAD

For Gerrit changes that contain changing submodule gitlinks, it would be
easy to extend both the fetch and checkout with the '--recurse-submodules'
flag, such that this command line snippet would produce the state of a
change locally.

However the functionality added in the previous patch, which would
ensure that we fetch the objects in the submodule that the gitlink pointed
at, only works for remote tracking branches so far, not for FETCH_HEAD.

Make sure that fetching a superproject to its FETCH_HEAD, also respects
the existence checks for objects in the submodule recursion.

Signed-off-by: Stefan Beller <sbeller@xxxxxxxxxx>
---
 builtin/fetch.c             | 5 ++++-
 t/t5526-fetch-submodules.sh | 2 +-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/builtin/fetch.c b/builtin/fetch.c
index e3b03ad3bd..f2d9e548bf 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -894,11 +894,14 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
 				rc |= update_local_ref(ref, what, rm, &note,
 						       summary_width);
 				free(ref);
-			} else
+			} else {
+				check_for_new_submodule_commits(&rm->old_oid);
 				format_display(&note, '*',
 					       *kind ? kind : "branch", NULL,
 					       *what ? what : "HEAD",
 					       "FETCH_HEAD", summary_width);
+			}
+
 			if (note.len) {
 				if (verbosity >= 0 && !shown_url) {
 					fprintf(stderr, _("From %.*s\n"),
diff --git a/t/t5526-fetch-submodules.sh b/t/t5526-fetch-submodules.sh
index af12c50e7d..a509eabb04 100755
--- a/t/t5526-fetch-submodules.sh
+++ b/t/t5526-fetch-submodules.sh
@@ -615,7 +615,7 @@ test_expect_success "fetch new commits on-demand when they are not reachable" '
 	git update-ref refs/changes/2 $D &&
 	(
 		cd downstream &&
-		git fetch --recurse-submodules --recurse-submodules-default on-demand origin refs/changes/2:refs/heads/my_branch &&
+		git fetch --recurse-submodules origin refs/changes/2 &&
 		git -C submodule cat-file -t $C &&
 		git checkout --recurse-submodules FETCH_HEAD
 	)
-- 
2.19.0




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