[PATCH v2 09/11] tools/kvm_stat: stop ignoring unhandled arguments

[Stefan Raspl <raspl@linux.vnet.ibm.com>]

From: Stefan Raspl <stefan.raspl@de.ibm.com>

Unhandled arguments, which could easily include typos, are simply
ignored. We should be strict to avoid undetected typos.
To reproduce start kvm_stat with an extra argument, e.g.
'kvm_stat -d bnuh5ol' and note that this will actually work.

Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
---
 tools/kvm/kvm_stat/kvm_stat | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/kvm/kvm_stat/kvm_stat b/tools/kvm/kvm_stat/kvm_stat
index 6ca18d15488e..42c34b8818f7 100755
--- a/tools/kvm/kvm_stat/kvm_stat
+++ b/tools/kvm/kvm_stat/kvm_stat
@@ -1517,7 +1517,9 @@ Press any other key to refresh statistics immediately.
                          help='restrict statistics to guest by name',
                          callback=cb_guest_to_pid,
                          )
-    (options, _) = optparser.parse_args(sys.argv)
+    options, ukn = optparser.parse_args(sys.argv)
+    if len(ukn) != 1:
+        sys.exit('Error: Unknown argument(s): ' + ', '.join(ukn[-2:]))
     try:
         # verify that we were passed a valid regex up front
         re.compile(options.fields)
-- 
2.13.5