From 6ef57910ab380179fb5d34fa032b30d4786c67fc Mon Sep 17 00:00:00 2001
From: Natanael Copa <ncopa@alpinelinux.org>
Date: Mon, 17 Apr 2023 13:01:05 +0200
Subject: [PATCH] abuild-tar: improve invalid opt handling

make sure we always print usage help text if we have an invalid option.

fixes https://gitlab.alpinelinux.org/alpine/abuild/-/issues/10101
---
 abuild-tar.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/abuild-tar.c b/abuild-tar.c
index c509d63..aa88cb4 100644
--- a/abuild-tar.c
+++ b/abuild-tar.c
@@ -385,7 +385,10 @@ int main(int argc, char **argv)
 	ENGINE_register_all_complete();
 #endif
 
-	while (getopt_long(argc, argv, "", options, &ndx) != -1) {
+	int c;
+	while ((c = getopt_long(argc, argv, "", options, &ndx)) != -1) {
+		if (c == '?')
+			return usage(stderr);
 		if (ndx == 0)
 			digest = optarg ? optarg : "sha1";
 	}