qemu-storage-daemon: Fix non-string --object properties

After processing the option string with the keyval parser, we get a
QDict that contains only strings. This QDict must be fed to a keyval
visitor which converts the strings into the right data types.

qmp_object_add(), however, uses the normal QObject input visitor, which
expects a QDict where all properties already have the QType that matches
the data type required by the QOM object type.

Change the --object implementation in qemu-storage-daemon so that it
doesn't call qmp_object_add(), but calls user_creatable_add_dict()
directly instead and pass it a new keyval boolean that decides which
visitor must be used.

Reported-by: Coiby Xu <coiby.xu@gmail.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

include/qom/object_interfaces.h

@@ -90,14 +90,18 @@ Object *user_creatable_add_type(const char *type, const char *id,
 /**
  * user_creatable_add_dict:
  * @qdict: the object definition
+ * @keyval: if true, use a keyval visitor for processing @qdict (i.e.
+ *          assume that all @qdict values are strings); otherwise, use
+ *          the normal QObject visitor (i.e. assume all @qdict values
+ *          have the QType expected by the QOM object type)
  * @errp: if an error occurs, a pointer to an area to store the error
  *
  * Create an instance of the user creatable object that is defined by
  * @qdict.  The object type is taken from the QDict key 'qom-type', its
  * ID from the key 'id'. The remaining entries in @qdict are used to
  * initialize the object properties.
  */
-void user_creatable_add_dict(QDict *qdict, Error **errp);
+void user_creatable_add_dict(QDict *qdict, bool keyval, Error **errp);
 
 /**
  * user_creatable_add_opts:

qemu-storage-daemon.c

@@ -278,7 +278,6 @@ static void process_options(int argc, char *argv[])
                 QemuOpts *opts;
                 const char *type;
                 QDict *args;
-                QObject *ret_data = NULL;
 
                 /* FIXME The keyval parser rejects 'help' arguments, so we must
                  * unconditionall try QemuOpts first. */
@@ -291,9 +290,8 @@ static void process_options(int argc, char *argv[])
                 qemu_opts_del(opts);
 
                 args = keyval_parse(optarg, "qom-type", &error_fatal);
-                qmp_object_add(args, &ret_data, &error_fatal);
+                user_creatable_add_dict(args, true, &error_fatal);
                 qobject_unref(args);
-                qobject_unref(ret_data);
                 break;
             }
         default:

qom/object_interfaces.c

@@ -106,7 +106,7 @@ Object *user_creatable_add_type(const char *type, const char *id,
     return obj;
 }
 
-void user_creatable_add_dict(QDict *qdict, Error **errp)
+void user_creatable_add_dict(QDict *qdict, bool keyval, Error **errp)
 {
     Visitor *v;
     Object *obj;
@@ -127,7 +127,11 @@ void user_creatable_add_dict(QDict *qdict, Error **errp)
     }
     qdict_del(qdict, "id");
 
-    v = qobject_input_visitor_new(QOBJECT(qdict));
+    if (keyval) {
+        v = qobject_input_visitor_new_keyval(QOBJECT(qdict));
+    } else {
+        v = qobject_input_visitor_new(QOBJECT(qdict));
+    }
     obj = user_creatable_add_type(type, id, qdict, v, errp);
     visit_free(v);
     object_unref(obj);

qom/qom-qmp-cmds.c

@@ -263,7 +263,7 @@ void qmp_object_add(QDict *qdict, QObject **ret_data, Error **errp)
         qobject_unref(pdict);
     }
 
-    user_creatable_add_dict(qdict, errp);
+    user_creatable_add_dict(qdict, false, errp);
 }
 
 void qmp_object_del(const char *id, Error **errp)