[Qemu-devel] [PATCH v2] qemu-ga: report success-response field in guest-info

[Qemu-devel] [PATCH v2] qemu-ga: report success-response field in guest-info

[Michal Privoznik]

This is a useful hint for users (or libvirt) whether a command returns
anything success and hence wait for reply or not.
---
diff to v1:
-changed condition in qmp_command_reports_success per Paolo's advice

 qapi-schema-guest.json |    6 +++++-
 qapi/qmp-core.h        |    1 +
 qapi/qmp-registry.c    |   12 ++++++++++++
 qga/commands.c         |    1 +
 4 files changed, 19 insertions(+), 1 deletions(-)

diff --git a/qapi-schema-guest.json b/qapi-schema-guest.json
index d955cf1..2cd5957 100644
--- a/qapi-schema-guest.json
+++ b/qapi-schema-guest.json
@@ -91,10 +91,14 @@
 #
 # @enabled: whether command is currently enabled by guest admin
 #
+# @success-response: whether command report success response or not.
+#                    See 'uest-shutdown' command for more detailed info.
+#
 # Since 1.1.0
 ##
 { 'type': 'GuestAgentCommandInfo',
-  'data': { 'name': 'str', 'enabled': 'bool' } }
+  'data': { 'name': 'str', 'enabled': 'bool',
+            'success-response': 'bool'} }
 
 ##
 # @GuestAgentInfo
diff --git a/qapi/qmp-core.h b/qapi/qmp-core.h
index 00446cf..271c3f2 100644
--- a/qapi/qmp-core.h
+++ b/qapi/qmp-core.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_reports_success(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 5414613..3f7303c 100644
--- a/qapi/qmp-registry.c
+++ b/qapi/qmp-registry.c
@@ -77,6 +77,18 @@ bool qmp_command_is_enabled(const char *name)
     return false;
 }
 
+bool qmp_command_reports_success(const char *name) {
+    QmpCommand *cmd;
+
+    QTAILQ_FOREACH(cmd, &qmp_commands, node) {
+        if (strcmp(cmd->name, name) == 0) {
+            return (cmd->options & QCO_NO_SUCCESS_RESP) == 0;
+        }
+    }
+
+    return true;
+}
+
 char **qmp_get_command_list(void)
 {
     QmpCommand *cmd;
diff --git a/qga/commands.c b/qga/commands.c
index 46b0b08..9811221 100644
--- a/qga/commands.c
+++ b/qga/commands.c
@@ -63,6 +63,7 @@ struct GuestAgentInfo *qmp_guest_info(Error **err)
         cmd_info = g_malloc0(sizeof(GuestAgentCommandInfo));
         cmd_info->name = strdup(*cmd_list);
         cmd_info->enabled = qmp_command_is_enabled(cmd_info->name);
+        cmd_info->success_response = qmp_command_reports_success(cmd_info->name);
 
         cmd_info_list = g_malloc0(sizeof(GuestAgentCommandInfoList));
         cmd_info_list->value = cmd_info;
-- 
1.7.8.6

[Qemu-devel] For 1.2: Re: [PATCH v2] qemu-ga: report success-response field in guest-info

[Eric Blake]

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On 08/21/2012 06:03 AM, Michal Privoznik wrote:
> This is a useful hint for users (or libvirt) whether a command returns
> anything success and hence wait for reply or not.
> ---
> diff to v1:
> -changed condition in qmp_command_reports_success per Paolo's advice
> 
>  qapi-schema-guest.json |    6 +++++-
>  qapi/qmp-core.h        |    1 +
>  qapi/qmp-registry.c    |   12 ++++++++++++
>  qga/commands.c         |    1 +
>  4 files changed, 19 insertions(+), 1 deletions(-)

Adding 'For 1.2', on the grounds that we changed semantics in 1.2 (1.1
didn't have any commands with success-response marking to begin with),
and therefore it is a usability bug if we don't fix it in time for this
release.

> 
> diff --git a/qapi-schema-guest.json b/qapi-schema-guest.json
> index d955cf1..2cd5957 100644
> --- a/qapi-schema-guest.json
> +++ b/qapi-schema-guest.json
> @@ -91,10 +91,14 @@
>  #
>  # @enabled: whether command is currently enabled by guest admin
>  #
> +# @success-response: whether command report success response or not.
> +#                    See 'uest-shutdown' command for more detailed info.

s/uest/guest/

-- 
Eric Blake   eblake@redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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Re: [Qemu-devel] For 1.2: Re: [PATCH v2] qemu-ga: report success-response field in guest-info

[Eric Blake]

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On 08/21/2012 06:17 AM, Eric Blake wrote:
> On 08/21/2012 06:03 AM, Michal Privoznik wrote:
>> This is a useful hint for users (or libvirt) whether a command returns
>> anything success and hence wait for reply or not.

>> +++ b/qapi-schema-guest.json
>> @@ -91,10 +91,14 @@
>>  #
>>  # @enabled: whether command is currently enabled by guest admin
>>  #
>> +# @success-response: whether command report success response or not.

This sentence is also awkward.  I suggest something like:

true unless the command does not respond on success

>> +#                    See 'uest-shutdown' command for more detailed info.
> 
> s/uest/guest/
> 

-- 
Eric Blake   eblake@redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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