Fix active image without data

Fixes image import resulting active image without any data
when the image happens to be deleted from staging before
_DeleteFromFS task is ran which is supposed to cleanup.

Change-Id: I6256a25d1907ec15fbdde560fc8eae37f3067213
Closes-Bug: #1889640

glance/async_/flows/api_image_import.py

@@ -278,7 +278,13 @@ class _DeleteFromFS(task.Task):
         :param file_path: path to the file being deleted
         """
         if CONF.enabled_backends:
-            store_api.delete(file_path, 'os_glance_staging_store')
+            try:
+                store_api.delete(file_path, 'os_glance_staging_store')
+            except store_api.exceptions.NotFound as e:
+                LOG.error(_("After upload to backend, deletion of staged "
+                            "image data from %(fn)s has failed because "
+                            "%(em)s"), {'fn': file_path,
+                                        'em': e.message})
         else:
             # TODO(abhishekk): After removal of backend module from
             # glance_store need to change this to use multi_backend

glance/tests/unit/async_/flows/test_api_image_import.py

@@ -174,6 +174,58 @@ class TestImportToStoreTask(test_utils.BaseTestCase):
             self.fail("Exception shouldn't be raised")
 
 
+class TestDeleteFromFS(test_utils.BaseTestCase):
+    def test_delete_with_backends_deletes(self):
+        task = import_flow._DeleteFromFS(TASK_ID1, TASK_TYPE)
+        self.config(enabled_backends='file:foo')
+        with mock.patch.object(import_flow.store_api, 'delete') as mock_del:
+            task.execute(mock.sentinel.path)
+            mock_del.assert_called_once_with(
+                mock.sentinel.path,
+                'os_glance_staging_store')
+
+    def test_delete_with_backends_delete_fails(self):
+        self.config(enabled_backends='file:foo')
+        task = import_flow._DeleteFromFS(TASK_ID1, TASK_TYPE)
+        with mock.patch.object(import_flow.store_api, 'delete') as mock_del:
+            mock_del.side_effect = store_exceptions.NotFound(image=IMAGE_ID1,
+                                                             message='Testing')
+            # If we didn't swallow this we would explode here
+            task.execute(mock.sentinel.path)
+            mock_del.assert_called_once_with(
+                mock.sentinel.path,
+                'os_glance_staging_store')
+
+            # Raise something unexpected and make sure it bubbles up
+            mock_del.side_effect = RuntimeError
+            self.assertRaises(RuntimeError,
+                              task.execute, mock.sentinel.path)
+
+    @mock.patch('os.path.exists')
+    @mock.patch('os.unlink')
+    def test_delete_without_backends_exists(self, mock_unlink, mock_exists):
+        mock_exists.return_value = True
+        task = import_flow._DeleteFromFS(TASK_ID1, TASK_TYPE)
+        task.execute('1234567foo')
+        # FIXME(danms): I have no idea why the code arbitrarily snips
+        # the first seven characters from the path. Need a comment or
+        # *something*.
+        mock_unlink.assert_called_once_with('foo')
+
+        mock_unlink.reset_mock()
+        mock_unlink.side_effect = OSError(123, 'failed')
+        # Make sure we swallow the OSError and don't explode
+        task.execute('1234567foo')
+
+    @mock.patch('os.path.exists')
+    @mock.patch('os.unlink')
+    def test_delete_without_backends_missing(self, mock_unlink, mock_exists):
+        mock_exists.return_value = False
+        task = import_flow._DeleteFromFS(TASK_ID1, TASK_TYPE)
+        task.execute('foo')
+        mock_unlink.assert_not_called()
+
+
 class TestImportCopyImageTask(test_utils.BaseTestCase):
 
     def setUp(self):

releasenotes/notes/fix_1889640-95d543629d7dadce.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Bug 1889640_: Image import might result 'active' image with no data.
+
+    .. _1889640: https://bugs.launchpad.net/glance/+bug/1889640