qemu-img: show help for invalid global options
The qemu-img sub-command executes regardless of invalid global options:
$ qemu-img --foo info test.img
qemu-img: unrecognized option '--foo'
image: test.img
...
The unrecognized option warning may be missed by the user. This can
hide incorrect command-lines in scripts and confuse users.
This patch prints the help information and terminates instead of
executing the sub-command.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20170317104541.28979-2-stefanha@redhat.com
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
diff --git a/qemu-img.c b/qemu-img.c
index 98b836b..ce293a4 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -4339,6 +4339,7 @@
while ((c = getopt_long(argc, argv, "+hVT:", long_options, NULL)) != -1) {
switch (c) {
case 'h':
+ case '?':
help();
return 0;
case 'V':
