When running `git fetch --no-recurse-submodules`, the exectation is that
we don't fetch any submodules. And while this works for fetches of a
single remote, it doesn't when fetching multiple remotes at once. The
result is that we do recurse into submodules even though the user has
explicitly asked us not to.

This is because while we pass on `--recurse-submodules={yes,on-demand}`
if specified by the user, we don't pass on `--no-recurse-submodules` to
the subprocess spawned to perform the submodule fetch.

Fix this by also forwarding this flag as expected.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
---
 builtin/fetch.c             |  2 ++
 t/t5526-fetch-submodules.sh | 19 +++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/builtin/fetch.c b/builtin/fetch.c
index c310d89878..08d7fc7233 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -1876,6 +1876,8 @@ static void add_options_to_argv(struct strvec *argv)
 		strvec_push(argv, "--keep");
 	if (recurse_submodules == RECURSE_SUBMODULES_ON)
 		strvec_push(argv, "--recurse-submodules");
+	else if (recurse_submodules == RECURSE_SUBMODULES_OFF)
+		strvec_push(argv, "--no-recurse-submodules");
 	else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
 		strvec_push(argv, "--recurse-submodules=on-demand");
 	if (tags == TAGS_SET)
diff --git a/t/t5526-fetch-submodules.sh b/t/t5526-fetch-submodules.sh
index dcdbe26a08..ba69cd583f 100755
--- a/t/t5526-fetch-submodules.sh
+++ b/t/t5526-fetch-submodules.sh
@@ -1180,4 +1180,23 @@ test_expect_success 'fetch --all with --recurse-submodules with multiple' '
 	test_line_count = 2 fetch-subs
 '
 
+test_expect_success "fetch --all with --no-recurse-submodules only fetches superproject" '
+	test_when_finished "rm -rf src_clone" &&
+
+	git clone --recurse-submodules src src_clone &&
+	(
+		cd src_clone &&
+		git remote add secondary ../src &&
+		git config submodule.recurse true &&
+		git config fetch.parallel 0 &&
+		git fetch --all --no-recurse-submodules 2>../actual
+	) &&
+
+	cat >expect <<-EOF &&
+	From ../src
+	 * [new branch]      master     -> secondary/master
+	EOF
+	test_cmp expect actual
+'
+
 test_done
-- 
2.40.1