From c3d3a693c4bb181f6673071de95e79fd97eda526 Mon Sep 17 00:00:00 2001
From: Miroslav Rezanina <mrezanin@redhat.com>
Date: Thu, 19 Apr 2018 12:33:44 -0300
Subject: [PATCH 3/7] qga: Add `guest-get-timezone` command
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RH-Author: Miroslav Rezanina <mrezanin@redhat.com>
Message-id: <605280b778254624582ec8aa72c72155d2206948.1524139831.git.mrezanin@redhat.com>
Patchwork-id: 79705
O-Subject: [RHEL-7.5.z qemu-guest-agent PATCH 3/7] qga: Add `guest-get-timezone` command
Bugzilla: 1598210
RH-Acked-by: Marc-André Lureau <marcandre.lureau@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Tomáš Golembiovský <tgolembi@redhat.com>

From: Vinzenz Feenstra <vfeenstr@redhat.com>

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 <vfeenstr@redhat.com>
Reviewed-by: Sameeh Jubran <sameeh@daynix.com>
Tested-by: Sameeh Jubran <sameeh@daynix.com>
* moved stub implementation to end of function for consistency
* document that timezone names are for informational use only.
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
(cherry picked from commit 53c58e64d0a27c59d763778faa2b5a522c544719)
Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
---
 qga/commands.c       | 38 ++++++++++++++++++++++++++++++++++++++
 qga/qapi-schema.json | 25 +++++++++++++++++++++++++
 2 files changed, 63 insertions(+)

diff --git a/qga/commands.c b/qga/commands.c
index 8c09938e28..5b73cd0e4d 100644
--- a/qga/commands.c
+++ b/qga/commands.c
@@ -510,3 +510,41 @@ GuestHostName *qmp_guest_get_host_name(Error **err)
     }
     return result;
 }
+
+GuestTimezone *qmp_guest_get_timezone(Error **errp)
+{
+#if GLIB_CHECK_VERSION(2, 28, 0)
+    GuestTimezone *info = NULL;
+    GTimeZone *tz = NULL;
+    gint64 now = 0;
+    gint32 intv = 0;
+    gchar const *name = NULL;
+
+    info = g_new0(GuestTimezone, 1);
+    tz = g_time_zone_new_local();
+    if (tz == NULL) {
+        error_setg(errp, QERR_QGA_COMMAND_FAILED,
+                   "Couldn't retrieve local timezone");
+        goto error;
+    }
+
+    now = g_get_real_time() / G_USEC_PER_SEC;
+    intv = g_time_zone_find_interval(tz, G_TIME_TYPE_UNIVERSAL, now);
+    info->offset = g_time_zone_get_offset(tz, intv);
+    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_free(info);
+    return NULL;
+#else
+    error_setg(errp, QERR_UNSUPPORTED);
+    return NULL;
+#endif
+}
diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
index 1695afe3a9..5af73fedae 100644
--- a/qga/qapi-schema.json
+++ b/qga/qapi-schema.json
@@ -1079,3 +1079,28 @@
 ##
 { 'command': 'guest-get-users',
   'returns': ['GuestUser'] }
+
+##
+# @GuestTimezone:
+#
+# @zone:    Timezone name. These values may differ depending on guest/OS and
+#           should only be used for informational purposes.
+# @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' }
-- 
2.13.6