[PATCH v3] 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 and Dragan's comments, dropped the null checking for argv[0].
No point in being too paranoid, I suppose :)

Note that after this morning it's not likely that I'll be able to find
time to update this again so quickly, so if there are other nits,
reviewers can feel free to send their own rerolls rather than waiting
for me to see it and turn the patch around.

 - Emily

 builtin/bugreport.c  | 5 +++++
 t/t0091-bugreport.sh | 7 +++++++
 2 files changed, 12 insertions(+)

diff --git a/builtin/bugreport.c b/builtin/bugreport.c
index d2ae5c305d..3106e56a13 100644
--- a/builtin/bugreport.c
+++ b/builtin/bugreport.c
@@ -126,6 +126,11 @@ int cmd_bugreport(int argc, const char **argv, const char *prefix)
 	argc = parse_options(argc, argv, prefix, bugreport_options,
 			     bugreport_usage, 0);
 
+	if (argc) {
+		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