From 495bf893b0db2621726815b5625a6a788d3958aa Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Fri, 11 Oct 2019 21:49:17 +0200
Subject: [PATCH] qemu-nbd: 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-nbd, too.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
 qemu-nbd.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/qemu-nbd.c b/qemu-nbd.c
index 9032b6de2a..caacf0ed73 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -507,6 +507,13 @@ static QemuOptsList qemu_object_opts = {
     },
 };
 
+static bool qemu_nbd_object_print_help(const char *type, QemuOpts *opts)
+{
+    if (user_creatable_print_help(type, opts)) {
+        exit(0);
+    }
+    return true;
+}
 
 
 static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, bool list,
@@ -902,7 +909,7 @@ int main(int argc, char **argv)
 
     qemu_opts_foreach(&qemu_object_opts,
                       user_creatable_add_opts_foreach,
-                      NULL, &error_fatal);
+                      qemu_nbd_object_print_help, &error_fatal);
 
     if (!trace_init_backends()) {
         exit(1);