[Qemu-devel] [PATCH] Extend qemu-ga's 'guest-info' command to expose flag 'success-response'

[Mark Wu <wudxw@linux.vnet.ibm.com>]

Now we have several qemu-ga commands not returning response on success.
It has been documented in qga/qapi-schema.json already. This patch exposes
the 'success-response' flag by extending 'guest-info' command. With this
change, the clients can handle the command response more flexibly.

Signed-off-by: Mark Wu <wudxw@linux.vnet.ibm.com>
---
 include/qapi/qmp/dispatch.h |  1 +
 qapi/qmp-registry.c         | 13 +++++++++++++
 qga/commands.c              |  2 ++
 qga/qapi-schema.json        |  4 +++-
 4 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/include/qapi/qmp/dispatch.h b/include/qapi/qmp/dispatch.h
index 1ce11f5..f08c1dd 100644
--- a/include/qapi/qmp/dispatch.h
+++ b/include/qapi/qmp/dispatch.h
@@ -48,6 +48,7 @@ QObject *qmp_dispatch(QObject *request);
 void qmp_disable_command(const char *name);
 void qmp_enable_command(const char *name);
 bool qmp_command_is_enabled(const char *name);
+bool qmp_command_has_success_response(const char *name);
 char **qmp_get_command_list(void);
 QObject *qmp_build_error_object(Error *errp);
 
diff --git a/qapi/qmp-registry.c b/qapi/qmp-registry.c
index 28bbbe8..f86c3a5 100644
--- a/qapi/qmp-registry.c
+++ b/qapi/qmp-registry.c
@@ -79,6 +79,19 @@ bool qmp_command_is_enabled(const char *name)
     return false;
 }
 
+bool qmp_command_has_success_response(const char *name)
+{
+    QmpCommand *cmd;
+
+    QTAILQ_FOREACH(cmd, &qmp_commands, node) {
+        if (strcmp(cmd->name, name) == 0) {
+            return cmd->options != QCO_NO_SUCCESS_RESP;
+        }
+    }
+
+    return false;
+}
+
 char **qmp_get_command_list(void)
 {
     QmpCommand *cmd;
diff --git a/qga/commands.c b/qga/commands.c
index 528b082..0df910b 100644
--- a/qga/commands.c
+++ b/qga/commands.c
@@ -63,6 +63,8 @@ struct GuestAgentInfo *qmp_guest_info(Error **err)
         cmd_info = g_malloc0(sizeof(GuestAgentCommandInfo));
         cmd_info->name = g_strdup(*cmd_list);
         cmd_info->enabled = qmp_command_is_enabled(cmd_info->name);
+        cmd_info->success_response =
+            qmp_command_has_success_response(cmd_info->name);
 
         cmd_info_list = g_malloc0(sizeof(GuestAgentCommandInfoList));
         cmd_info_list->value = cmd_info;
diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
index 7155b7a..6caf019 100644
--- a/qga/qapi-schema.json
+++ b/qga/qapi-schema.json
@@ -141,10 +141,12 @@
 #
 # @enabled: whether command is currently enabled by guest admin
 #
+# @success-response: whether command returns a response on success
+#
 # Since 1.1.0
 ##
 { 'type': 'GuestAgentCommandInfo',
-  'data': { 'name': 'str', 'enabled': 'bool' } }
+  'data': { 'name': 'str', 'enabled': 'bool', 'success-response': 'bool' } }
 
 ##
 # @GuestAgentInfo
-- 
1.8.3.1