hyper-v: Deprecates support for Windows / Hyper-V Server 2012

Starting with Rocky, we will support only Windows / Hyper-V Server
2012 R2 or newer.

(cherry-picked from 2e51da875aceeb21d5bde9ab844c3882178ccd99)

Change-Id: I6844a0664860d09ecd259cea7715fe50814b5362

compute_hyperv/nova/driver.py

@@ -127,7 +127,8 @@ class HyperVDriver(driver.ComputeDriver):
         self._pathutils = pathutils.PathUtils()
 
     def _check_minimum_windows_version(self):
-        if not utilsfactory.get_hostutils().check_min_windows_version(6, 2):
+        hostutils = utilsfactory.get_hostutils()
+        if not hostutils.check_min_windows_version(6, 2):
             # the version is of Windows is older than Windows Server 2012 R2.
             # Log an error, letting users know that this version is not
             # supported any longer.
@@ -136,6 +137,12 @@ class HyperVDriver(driver.ComputeDriver):
                       'Server 2012). The support for this version of '
                       'Windows has been removed in Mitaka.')
             raise exception.HypervisorTooOld(version='6.2')
+        elif not hostutils.check_min_windows_version(6, 3):
+            # TODO(claudiub): replace the warning with an exception in Rocky.
+            LOG.warning('You are running nova-compute on Windows / Hyper-V '
+                        'Server 2012. The support for this version of Windows '
+                        'has been deprecated In Queens, and will be removed '
+                        'in Rocky.')
 
     @property
     def need_legacy_block_device_info(self):

compute_hyperv/tests/unit/test_driver.py

@@ -54,14 +54,21 @@ class HyperVDriverTestCase(test_base.HyperVBaseTestCase):
         self.driver._image_api = mock.MagicMock()
         self.driver._pathutils = mock.MagicMock()
 
+    @mock.patch.object(driver.LOG, 'warning')
     @mock.patch.object(driver.utilsfactory, 'get_hostutils')
-    def test_check_minimum_windows_version(self, mock_get_hostutils):
+    def test_check_minimum_windows_version(self, mock_get_hostutils,
+                                           mock_warning):
         mock_hostutils = mock_get_hostutils.return_value
         mock_hostutils.check_min_windows_version.return_value = False
 
         self.assertRaises(exception.HypervisorTooOld,
                           self.driver._check_minimum_windows_version)
 
+        mock_hostutils.check_min_windows_version.side_effect = [True, False]
+
+        self.driver._check_minimum_windows_version()
+        self.assertTrue(mock_warning.called)
+
     def test_public_api_signatures(self):
         # NOTE(claudiub): wrapped functions do not keep the same signature in
         # Python 2.7, which causes this test to fail. Instead, we should

releasenotes/notes/hyper-v-server-2012-support-deprecated-02a956e3926351d6.yaml

@@ -0,0 +1,6 @@
+---
+deprecations:
+  - |
+    Support for Windows / Hyper-V Server 2012 has been deprecated in Queens
+    in nova and will be removed in Rocky. The supported versions are Windows /
+    Hyper-V Server 2012 R2 or newer.