Re: [Qemu-devel] [PATCH v5] qga: Add `guest-get-timezone` command

[Vinzenz Feenstra]

Ping

> On Mar 23, 2017, at 12:39 PM, Vinzenz 'evilissimo' Feenstra <address@hidden> 
> wrote:
> 
> From: Vinzenz Feenstra <address@hidden>
> 
> Adds a new command `guest-get-timezone` reporting the currently
> configured timezone on the system. The information on what timezone is
> currently is configured is useful in case of Windows VMs where the
> offset of the hardware clock is required to have the same offset. This
> can be used for management systems like `oVirt` to detect the timezone
> difference and warn administrators of the misconfiguration.
> 
> Signed-off-by: Vinzenz Feenstra <address@hidden>
> ---
> qga/commands.c       | 29 +++++++++++++++++++++++++++++
> qga/qapi-schema.json | 26 ++++++++++++++++++++++++++
> 2 files changed, 55 insertions(+)
> 
> diff --git a/qga/commands.c b/qga/commands.c
> index 4d92946..3b5789c 100644
> --- a/qga/commands.c
> +++ b/qga/commands.c
> @@ -499,3 +499,32 @@ int ga_parse_whence(GuestFileWhence *whence, Error 
> **errp)
>     error_setg(errp, "invalid whence code %"PRId64, whence->u.value);
>     return -1;
> }
> +
> +GuestTimezone *qmp_guest_get_timezone(Error **errp)
> +{
> +    GuestTimezone *info = g_new0(GuestTimezone, 1);
> +    GTimeZone *tz = g_time_zone_new_local();
> +    if (tz == NULL) {
> +        error_setg(errp, QERR_QGA_COMMAND_FAILED,
> +                   "Couldn't retrieve local timezone");
> +        goto error;
> +    }
> +
> +    gint64 now = g_get_real_time() / G_USEC_PER_SEC;
> +    gint32 intv = g_time_zone_find_interval(tz, G_TIME_TYPE_UNIVERSAL, now);
> +    info->offset = g_time_zone_get_offset(tz, intv);
> +    gchar const *name = g_time_zone_get_abbreviation(tz, intv);
> +    if (name != NULL) {
> +        info->has_zone = true;
> +        info->zone = g_strdup(name);
> +    }
> +    g_time_zone_unref(tz);
> +
> +    return info;
> +
> +error:
> +    g_time_zone_unref(tz);
> +    g_free(info);
> +    return NULL;
> +}
> +
> diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
> index a02dbf2..5183ea2 100644
> --- a/qga/qapi-schema.json
> +++ b/qga/qapi-schema.json
> @@ -1042,3 +1042,29 @@
>   'data':    { 'path': 'str', '*arg': ['str'], '*env': ['str'],
>                '*input-data': 'str', '*capture-output': 'bool' },
>   'returns': 'GuestExec' }
> +
> +
> +##
> +# @GuestTimezone:
> +#
> +# @zone:    Timezone name
> +# @offset:  Offset to UTC in seconds, negative numbers for time zones west of
> +#           GMT, positive numbers for east
> +#
> +# Since: 2.10
> +##
> +{ 'struct': 'GuestTimezone',
> +  'data':   { '*zone': 'str', 'offset': 'int' } }
> +
> +
> +##
> +# @guest-get-timezone:
> +#
> +# Retrieves the timezone information from the guest.
> +#
> +# Returns: A GuestTimezone dictionary.
> +#
> +# Since: 2.10
> +##
> +{ 'command': 'guest-get-timezone',
> +  'returns': 'GuestTimezone' }
> -- 
> 2.9.3
> 

--
Vinzenz Feenstra
Senior Software Developer
Red Hat Czech