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>
---
 qemu-io.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/qemu-io.c b/qemu-io.c
index f64eca6940..91e3276592 100644
--- 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);
-- 
2.20.1

On 10/11/19 3:55 PM, Kevin Wolf wrote:
> 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>
> ---
>   qemu-io.c | 9 ++++++++-
>   1 file changed, 8 insertions(+), 1 deletion(-)
> 

Reviewed-by: Eric Blake <eblake@redhat.com>

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org