qga: Use common time encoding for guest-get-devices 'driver-date'

guest-get-devices returns 'driver-date' as string in the format YYYY-MM-DD. Goes back to recent commit 2e4211c "qga: add command guest-get-devices for reporting VirtIO devices". We should avoid use of multiple encodings for the same kind of data. Especially string encodings. Change it to return nanoseconds since the epoch, like guest-get-time does. Signed-off-by: Markus Armbruster <[email protected]> Reviewed-by: Marc-André Lureau <[email protected]> Signed-off-by: Michael Roth <[email protected]>
zhugh2333 · Nov 2, 2020 · a88bcee · a88bcee
1 parent b519e2e
commit a88bcee
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Showing 2 changed files with 13 additions and 10 deletions.
diff --git a/qga/commands-win32.c b/qga/commands-win32.c
@@ -1641,6 +1641,12 @@ GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
     return head;
 }
 
+static int64_t filetime_to_ns(const FILETIME *tf)
+{
+    return ((((int64_t)tf->dwHighDateTime << 32) | tf->dwLowDateTime)
+            - W32_FT_OFFSET) * 100;
+}
+
 int64_t qmp_guest_get_time(Error **errp)
 {
     SYSTEMTIME ts = {0};
@@ -1657,8 +1663,7 @@ int64_t qmp_guest_get_time(Error **errp)
         return -1;
     }
 
-    return ((((int64_t)tf.dwHighDateTime << 32) | tf.dwLowDateTime)
-                - W32_FT_OFFSET) * 100;
+    return filetime_to_ns(&tf);
 }
 
 void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp)
@@ -2363,7 +2368,6 @@ GuestDeviceInfoList *qmp_guest_get_devices(Error **errp)
     slog("enumerating devices");
     for (i = 0; SetupDiEnumDeviceInfo(dev_info, i, &dev_info_data); i++) {
         bool skip = true;
-        SYSTEMTIME utc_date;
         g_autofree LPWSTR name = NULL;
         g_autofree LPFILETIME date = NULL;
         g_autofree LPWSTR version = NULL;
@@ -2434,13 +2438,12 @@ GuestDeviceInfoList *qmp_guest_get_devices(Error **errp)
             slog("failed to get driver date");
             continue;
         }
-        FileTimeToSystemTime(date, &utc_date);
-        device->driver_date = g_strdup_printf("%04d-%02d-%02d",
-            utc_date.wYear, utc_date.wMonth, utc_date.wDay);
+        device->driver_date = filetime_to_ns(date);
         device->has_driver_date = true;
 
-        slog("driver: %s\ndriver version: %s,%s\n", device->driver_name,
-            device->driver_date, device->driver_version);
+        slog("driver: %s\ndriver version: %" PRId64 ",%s\n",
+             device->driver_name, device->driver_date,
+             device->driver_version);
         item = g_new0(GuestDeviceInfoList, 1);
         item->value = g_steal_pointer(&device);
         if (!cur_item) {

diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
@@ -1282,7 +1282,7 @@
 # @GuestDeviceInfo:
 #
 # @driver-name: name of the associated driver
-# @driver-date: driver release date in format YYYY-MM-DD
+# @driver-date: driver release date, in nanoseconds since the epoch
 # @driver-version: driver version
 # @id: device ID
 #
@@ -1291,7 +1291,7 @@
 { 'struct': 'GuestDeviceInfo',
   'data': {
       'driver-name': 'str',
-      '*driver-date': 'str',
+      '*driver-date': 'int',
       '*driver-version': 'str',
       '*id': 'GuestDeviceId'
   } }