From 2d5a8346a484250934526a15b3a522bdba7e6772 Mon Sep 17 00:00:00 2001
From: Eric Blake <eblake@redhat.com>
Date: Wed, 15 Apr 2015 09:19:23 -0600
Subject: [PATCH] qmp: Give saner messages related to qmp_capabilities misuse

Pretending that QMP doesn't understand a command merely because
we are not in the right mode doesn't help first-time users figure
out what to do to correct things.  Although the documentation for
QMP calls out capabilities negotiation, we should also make it
clear in our error messages what we were expecting.  With this
patch, I now get the following transcript:

$ ./x86_64-softmmu/qemu-system-x86_64 -qmp stdio -nodefaults
{"QMP": {"version": {"qemu": {"micro": 93, "minor": 2, "major": 2}, "package": ""}, "capabilities": []}}
{"execute":"huh"}
{"error": {"class": "CommandNotFound", "desc": "The command huh has not been found"}}
{"execute":"quit"}
{"error": {"class": "CommandNotFound", "desc": "Expecting capabilities negotiation with 'qmp_capabilities' before command 'quit'"}}
{"execute":"qmp_capabilities"}
{"return": {}}
{"execute":"qmp_capabilities"}
{"error": {"class": "CommandNotFound", "desc": "Capabilities negotiation is already complete, command 'qmp_capabilities' ignored"}}
{"execute":"quit"}
{"return": {}}
{"timestamp": {"seconds": 1429110729, "microseconds": 181935}, "event": "SHUTDOWN"}

Signed-off-by: Eric Blake <eblake@redhat.com>
Tested-By: Kashyap Chamarthy <kchamart@redhat.com>
Reviewed-by: Paulo Vital <paulo.vital@profitbricks.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 monitor.c | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/monitor.c b/monitor.c
index 68873ec09cd6..9f3770048609 100644
--- a/monitor.c
+++ b/monitor.c
@@ -4783,10 +4783,22 @@ static int monitor_can_read(void *opaque)
     return (mon->suspend_cnt == 0) ? 1 : 0;
 }
 
-static int invalid_qmp_mode(const Monitor *mon, const mon_cmd_t *cmd)
+static bool invalid_qmp_mode(const Monitor *mon, const mon_cmd_t *cmd)
 {
-    int is_cap = cmd->mhandler.cmd_new == do_qmp_capabilities;
-    return (qmp_cmd_mode(mon) ? is_cap : !is_cap);
+    bool is_cap = cmd->mhandler.cmd_new == do_qmp_capabilities;
+    if (is_cap && qmp_cmd_mode(mon)) {
+        qerror_report(ERROR_CLASS_COMMAND_NOT_FOUND,
+                      "Capabilities negotiation is already complete, command "
+                      "'%s' ignored", cmd->name);
+        return true;
+    }
+    if (!is_cap && !qmp_cmd_mode(mon)) {
+        qerror_report(ERROR_CLASS_COMMAND_NOT_FOUND,
+                      "Expecting capabilities negotiation with "
+                      "'qmp_capabilities' before command '%s'", cmd->name);
+        return true;
+    }
+    return false;
 }
 
 /*
@@ -5080,11 +5092,14 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
     cmd_name = qdict_get_str(input, "execute");
     trace_handle_qmp_command(mon, cmd_name);
     cmd = qmp_find_cmd(cmd_name);
-    if (!cmd || invalid_qmp_mode(mon, cmd)) {
+    if (!cmd) {
         qerror_report(ERROR_CLASS_COMMAND_NOT_FOUND,
                       "The command %s has not been found", cmd_name);
         goto err_out;
     }
+    if (invalid_qmp_mode(mon, cmd)) {
+        goto err_out;
+    }
 
     obj = qdict_get(input, "arguments");
     if (!obj) {