qemu-io: Support help options for --object

Instead of parsing help options as normal object properties and
returning an error, provide the same help functionality as the system
emulator in qemu-io, too.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

diff --git a/qemu-io.c b/qemu-io.c
index f64eca694039e27bad6cdf2f532a61558246007a..91e327659274017988078531e25f12073fa064be 100644 (file)
--- a/qemu-io.c
+++ b/qemu-io.c
@@ -475,6 +475,13 @@ static QemuOptsList qemu_object_opts = {
     },
 };
 
+static bool qemu_io_object_print_help(const char *type, QemuOpts *opts)
+{
+    if (user_creatable_print_help(type, opts)) {
+        exit(0);
+    }
+    return true;
+}
 
 static QemuOptsList file_opts = {
     .name = "file",
@@ -622,7 +629,7 @@ int main(int argc, char **argv)
 
     qemu_opts_foreach(&qemu_object_opts,
                       user_creatable_add_opts_foreach,
-                      NULL, &error_fatal);
+                      qemu_io_object_print_help, &error_fatal);
 
     if (!trace_init_backends()) {
         exit(1);