commit 105fad6bb226ac3404874fe3fd7013ad6f86fc86
author Bishara AbuHattoum <bishara@daynix.com> Tue Aug 22 16:55:04 2017 +0300
committer Michael Roth <mdroth@linux.vnet.ibm.com> Wed Oct 25 17:50:50 2017 -0500
tree 46791162b5f99223b043baa5f57a47efe0e958eb
parent 4d80d20fe12248956c07587376f5b5a741f74aa2

qga-win: Updating guest_set_time action

  At the moment, Windows libraries don't provide a way to access
  RTC, so, a workaround is to use the Windows w32tm command to
  resync the time.
  Related bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1183874

Signed-off-by: Bishara AbuHattoum <bishara@daynix.com>
Reviewed-by: Sameeh Jubran <sameeh@daynix.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

qga/commands-win32.c

diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index 619dbd2..fbd7eb7 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -29,6 +29,7 @@
 #endif
 #include <lm.h>
 #include <wtsapi32.h>
+#include <wininet.h>
 
 #include "qga/guest-agent-core.h"
 #include "qga/vss-win32.h"
@@ -1277,8 +1278,41 @@
          * RTC yet:
          *
          * https://msdn.microsoft.com/en-us/library/aa908981.aspx
+         *
+         * Instead, a workaround is to use the Windows win32tm command to
+         * resync the time using the Windows Time service.
          */
-        error_setg(errp, "Time argument is required on this platform");
+        LPVOID msg_buffer;
+        DWORD ret_flags;
+
+        HRESULT hr = system("w32tm /resync /nowait");
+
+        if (GetLastError() != 0) {
+            strerror_s((LPTSTR) & msg_buffer, 0, errno);
+            error_setg(errp, "system(...) failed: %s", (LPCTSTR)msg_buffer);
+        } else if (hr != 0) {
+            if (hr == HRESULT_FROM_WIN32(ERROR_SERVICE_NOT_ACTIVE)) {
+                error_setg(errp, "Windows Time service not running on the "
+                                 "guest");
+            } else {
+                if (!FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
+                                   FORMAT_MESSAGE_FROM_SYSTEM |
+                                   FORMAT_MESSAGE_IGNORE_INSERTS, NULL,
+                                   (DWORD)hr, MAKELANGID(LANG_NEUTRAL,
+                                   SUBLANG_DEFAULT), (LPTSTR) & msg_buffer, 0,
+                                   NULL)) {
+                    error_setg(errp, "w32tm failed with error (0x%lx), couldn'"
+                                     "t retrieve error message", hr);
+                } else {
+                    error_setg(errp, "w32tm failed with error (0x%lx): %s", hr,
+                               (LPCTSTR)msg_buffer);
+                    LocalFree(msg_buffer);
+                }
+            }
+        } else if (!InternetGetConnectedState(&ret_flags, 0)) {
+            error_setg(errp, "No internet connection on guest, sync not "
+                             "accurate");
+        }
         return;
     }