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 | 31 +++++++++++++++++++++++++++++++
 2 files changed, 33 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..162e5bac2f 100755
--- a/t/t5526-fetch-submodules.sh
+++ b/t/t5526-fetch-submodules.sh
@@ -1180,4 +1180,35 @@ 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 "git -C downstream remote remove second" &&
+
+	# We need to add a second remote, otherwise --all falls back to the
+	# normal fetch-one case.
+	git -C downstream remote add second .. &&
+	git -C downstream fetch --all &&
+
+	add_submodule_commits &&
+	add_superproject_commits &&
+	old_commit=$(git rev-parse --short HEAD~) &&
+	new_commit=$(git rev-parse --short HEAD) &&
+
+	git -C downstream fetch --all --no-recurse-submodules >actual.out 2>actual.err &&
+
+	cat >expect.out <<-EOF &&
+	Fetching origin
+	Fetching second
+	EOF
+
+	cat >expect.err <<-EOF &&
+	From $(test-tool path-utils real_path .)/.
+	   $old_commit..$new_commit  super      -> origin/super
+	From ..
+	   $old_commit..$new_commit  super      -> second/super
+	EOF
+
+	test_cmp expect.out actual.out &&
+	test_cmp expect.err actual.err
+'
+
 test_done
-- 
2.40.1