[PATCH 3/3] sparse-checkout: tighten add_patterns_from_input()

[Junio C Hamano <gitster@pobox.com>]

The add_patterns_from_input() function was introduced at 6fb705ab
(sparse-checkout: extract add_patterns_from_input(), 2020-02-11) and
then modified by 00408ade (builtin/sparse-checkout: add check-rules
command, 2023-03-27).  Throughout its life, it either allowed to
read patterns from the file (before 00408ade, it only allowed the
standard input, after 00408ade, an arbitrary FILE *) or from argv[],
but never both.  However, when we read from a file, the function
never checked that there is nothing in argv[] (in other words, the
command line arguments have fully been consumed), resulting in
excess arguments silently getting ignored.

This caused commands like "git sparse-checkout set [--stdin]" and
"git sparse-checkout check-rules [--rules-file <file>]" to silently
ignore the rest of the command line arguments without reporting.

The fix finally makes the --end-of-options handling for this
subcommand also work, so add test for it, too.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/sparse-checkout.c          |  4 ++++
 t/t1091-sparse-checkout-builtin.sh | 11 ++++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/builtin/sparse-checkout.c b/builtin/sparse-checkout.c
index 04ae81fce8..1166e1e298 100644
--- a/builtin/sparse-checkout.c
+++ b/builtin/sparse-checkout.c
@@ -555,6 +555,10 @@ static void add_patterns_from_input(struct pattern_list *pl,
 				    FILE *file)
 {
 	int i;
+
+	if (file && argc)
+		die(_("excess command line parameter '%s'"), argv[0]);
+
 	if (core_sparse_checkout_cone) {
 		struct strbuf line = STRBUF_INIT;
 
diff --git a/t/t1091-sparse-checkout-builtin.sh b/t/t1091-sparse-checkout-builtin.sh
index e33a6ed1b4..107ed170ac 100755
--- a/t/t1091-sparse-checkout-builtin.sh
+++ b/t/t1091-sparse-checkout-builtin.sh
@@ -937,6 +937,10 @@ test_expect_success 'check-rules cone mode' '
 	EOF
 
 	git -C bare ls-tree -r --name-only HEAD >all-files &&
+
+	test_must_fail git -C bare sparse-checkout check-rules --cone \
+		--rules-file ../rules excess args <all-files &&
+
 	git -C bare sparse-checkout check-rules --cone \
 		--rules-file ../rules >check-rules-file <all-files &&
 
@@ -947,6 +951,7 @@ test_expect_success 'check-rules cone mode' '
 	git -C repo sparse-checkout check-rules >check-rules-default <all-files &&
 
 	test_grep "deep/deeper1/deepest/a" check-rules-file &&
+	test_grep ! "end-of-options" check-rules-file &&
 	test_grep ! "deep/deeper2" check-rules-file &&
 
 	test_cmp check-rules-file ls-files &&
@@ -959,8 +964,12 @@ test_expect_success 'check-rules non-cone mode' '
 	EOF
 
 	git -C bare ls-tree -r --name-only HEAD >all-files &&
+
+	test_must_fail git -C bare sparse-checkout check-rules --no-cone \
+		--rules-file ../rules excess args <all-files &&
+
 	git -C bare sparse-checkout check-rules --no-cone --rules-file ../rules\
-		>check-rules-file <all-files &&
+		--end-of-options >check-rules-file <all-files &&
 
 	cat rules | git -C repo sparse-checkout set --no-cone --stdin &&
 	git -C repo ls-files -t >out &&
-- 
2.43.0-174-g055bb6e996