Fix unintentional exception inspecting VMDK

It looks like a raise statement was left in the virtual_size property
handler for VMDK, which should have been converted to a log at some
point. All the other inspectors return zero for virtual_size if the
format does not match or they are unable to parse the data. This
converts that raise to a log, and adds a test to make sure we make it
far enough in the processing of the complex VMDK format to ensure that
behavior.

Closes-Bug: #1983279

Change-Id: I0352ab6b2c00055de094ac5902b8d50941d06dcf
(cherry picked from commit 199722a)
(cherry picked from commit 07f9874)

Author: kk7ds

glance/common/format_inspector.py

@@ -567,7 +567,7 @@ def virtual_size(self):
         else:
             vmdktype = b'formatnotfound'
         if vmdktype != b'monolithicSparse':
-            raise ImageFormatError('Unsupported VMDK format %s' % vmdktype)
+            LOG.warning('Unsupported VMDK format %s', vmdktype)
             return 0
 
         # If we have the descriptor, we definitely have the header

glance/tests/unit/common/test_format_inspector.py

@@ -153,6 +153,24 @@ def test_vmdk_invalid(self):
     def test_vdi_invalid(self):
         self._test_format_with_invalid_data('vdi')
 
+    def test_vmdk_invalid_type(self):
+        fmt = format_inspector.get_inspector('vmdk')()
+        wrapper = format_inspector.InfoWrapper(open(__file__, 'rb'), fmt)
+        while True:
+            chunk = wrapper.read(32)
+            if not chunk:
+                break
+
+        wrapper.close()
+
+        fake_rgn = mock.MagicMock()
+        fake_rgn.complete = True
+        fake_rgn.data = b'foocreateType="someunknownformat"bar'
+
+        with mock.patch.object(fmt, 'has_region', return_value=True):
+            with mock.patch.object(fmt, 'region', return_value=fake_rgn):
+                self.assertEqual(0, fmt.virtual_size)
+
 
 class TestFormatInspectorInfra(test_utils.BaseTestCase):
     def _test_capture_region_bs(self, bs):