From cd1c89493b99c72fcccae88cc1ca4393ce02b3a6 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Thu, 20 Apr 2023 11:18:21 -0400
Subject: main: Check for at least one option

---
diff --git a/src/main.c b/src/main.c
index b83e35f..7a0efd5 100644
--- a/src/main.c
+++ b/src/main.c
@@ -205,6 +205,12 @@ main(int argc, char *argv[])
 		_help_tip(program_name);
 		return EXIT_FAILURE;
 	}
+	if (control_files == NULL && list_members == 0) {
+		fprintf(stderr, "%s: At least one of -I, -f, or -c must be "
+				"given\n", program_name);
+		_help_tip(program_name);
+		return EXIT_FAILURE;
+	}
 
 	/* Initialize outer archive. */
 	opk = opkg_opk_opk_init(argv[0]);
--
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