From b03fa373a1073b7902fcbb022d5497b2752e4119 Mon Sep 17 00:00:00 2001
From: Joe Thornber <ejt@redhat.com>
Date: Mon, 9 Jun 2014 10:51:10 +0100
Subject: [PATCH] [thin_delta] Print usage on unrecognised switch

---
 features/thin_delta.feature     | 4 ++++
 thin-provisioning/thin_delta.cc | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/features/thin_delta.feature b/features/thin_delta.feature
index 249d4a6..2bfe0db 100644
--- a/features/thin_delta.feature
+++ b/features/thin_delta.feature
@@ -27,3 +27,7 @@ Feature: thin_delta
       {-h|--help}
       {-V|--version}
     """
+
+  Scenario: Unrecognised option should cause failure
+    When I run `thin_delta --unleash-the-hedeghogs`
+    Then it should fail
diff --git a/thin-provisioning/thin_delta.cc b/thin-provisioning/thin_delta.cc
index 969b714..0c4299e 100644
--- a/thin-provisioning/thin_delta.cc
+++ b/thin-provisioning/thin_delta.cc
@@ -37,6 +37,10 @@ int main(int argc, char **argv)
 		case 'V':
 			cout << THIN_PROVISIONING_TOOLS_VERSION << endl;
 			return 0;
+
+		default:
+			usage(cerr, basename(argv[0]));
+			return 1;
 		}
 	}