[PATCH v2] bugreport: reject positional arguments

[emilyshaffer@google.com]

From: Emily Shaffer <nasamuffin@google.com>

git-bugreport already rejected unrecognized flag arguments, like
`--diaggnose`, but this doesn't help if the user's mistake was to forget
the `--` in front of the argument. This can result in a user's intended
argument not being parsed with no indication to the user that something
went wrong. Since git-bugreport presently doesn't take any positionals
at all, let's reject all positionals and give the user a usage hint.

Signed-off-by: Emily Shaffer <nasamuffin@google.com>
---
Per Eric's suggestion, added a citation of the first positional arg
found. I don't think it's necessary to unroll the entire argv array
here, though.

 - Emily

 builtin/bugreport.c  | 6 ++++++
 t/t0091-bugreport.sh | 7 +++++++
 2 files changed, 13 insertions(+)

diff --git a/builtin/bugreport.c b/builtin/bugreport.c
index d2ae5c305d..8a69a23397 100644
--- a/builtin/bugreport.c
+++ b/builtin/bugreport.c
@@ -126,6 +126,12 @@ int cmd_bugreport(int argc, const char **argv, const char *prefix)
 	argc = parse_options(argc, argv, prefix, bugreport_options,
 			     bugreport_usage, 0);
 
+	if (argc) {
+		if (argv[0])
+			error(_("unknown argument `%s'"), argv[0]);
+		usage(bugreport_usage[0]);
+	}
+
 	/* Prepare the path to put the result */
 	prefixed_filename = prefix_filename(prefix,
 					    option_output ? option_output : "");
diff --git a/t/t0091-bugreport.sh b/t/t0091-bugreport.sh
index f6998269be..5b1b3e8d07 100755
--- a/t/t0091-bugreport.sh
+++ b/t/t0091-bugreport.sh
@@ -69,6 +69,13 @@ test_expect_success 'incorrect arguments abort with usage' '
 	test_path_is_missing git-bugreport-*
 '
 
+test_expect_success 'incorrect positional arguments abort with usage and hint' '
+	test_must_fail git bugreport false 2>output &&
+	test_i18ngrep usage output &&
+	test_i18ngrep false output &&
+	test_path_is_missing git-bugreport-*
+'
+
 test_expect_success 'runs outside of a git dir' '
 	test_when_finished rm non-repo/git-bugreport-* &&
 	nongit git bugreport
-- 
2.42.0.758.gaed0368e0e-goog