Add openstack server create --boot-from-volume option

This adds a --boot-from-volume option to the server create
command which is used with the --image or --image-property
option and will create a volume-backed server from the
specified image with the specified size. Similar to the
--volume option, the created root volume will not be deleted
when the server is deleted. The --boot-from-volume option
is not allowed with the --volume option since they both create
a block device mapping with boot_index=0.

Change-Id: I88c590361cb232c1df7b5bb010dcea307080d34c
Story: 2006302
Task: 36017

openstackclient/compute/v2/server.py

@@ -567,6 +567,19 @@ class CreateServer(command.ShowOne):
                    'only by default. (supported by --os-compute-api-version '
                    '2.74 or above)'),
         )
+        parser.add_argument(
+            '--boot-from-volume',
+            metavar='<volume-size>',
+            type=int,
+            help=_('When used in conjunction with the ``--image`` or '
+                   '``--image-property`` option, this option automatically '
+                   'creates a block device mapping with a boot index of 0 '
+                   'and tells the compute service to create a volume of the '
+                   'given size (in GB) from the specified image and use it '
+                   'as the root disk of the server. The root volume will not '
+                   'be deleted when the server is deleted. This option is '
+                   'mutually exclusive with the ``--volume`` option.')
+        )
         parser.add_argument(
             '--block-device-mapping',
             metavar='<dev-name=mapping>',
@@ -730,6 +743,10 @@ class CreateServer(command.ShowOne):
         # Lookup parsed_args.volume
         volume = None
         if parsed_args.volume:
+            # --volume and --boot-from-volume are mutually exclusive.
+            if parsed_args.boot_from_volume:
+                raise exceptions.CommandError(
+                    _('--volume is not allowed with --boot-from-volume'))
             volume = utils.find_resource(
                 volume_client.volumes,
                 parsed_args.volume,
@@ -739,8 +756,6 @@ class CreateServer(command.ShowOne):
         flavor = utils.find_resource(compute_client.flavors,
                                      parsed_args.flavor)
 
-        boot_args = [parsed_args.server_name, image, flavor]
-
         files = {}
         for f in parsed_args.file:
             dst, src = f.split('=', 1)
@@ -787,6 +802,20 @@ class CreateServer(command.ShowOne):
                                         'source_type': 'volume',
                                         'destination_type': 'volume'
                                         }]
+        elif parsed_args.boot_from_volume:
+            # Tell nova to create a root volume from the image provided.
+            block_device_mapping_v2 = [{
+                'uuid': image.id,
+                'boot_index': '0',
+                'source_type': 'image',
+                'destination_type': 'volume',
+                'volume_size': parsed_args.boot_from_volume
+            }]
+            # If booting from volume we do not pass an image to compute.
+            image = None
+
+        boot_args = [parsed_args.server_name, image, flavor]
+
         # Handle block device by device name order, like: vdb -> vdc -> vdd
         for dev_name in sorted(six.iterkeys(parsed_args.block_device_mapping)):
             dev_map = parsed_args.block_device_mapping[dev_name]

openstackclient/tests/functional/compute/v2/test_server.py

@@ -701,6 +701,82 @@ class ServerTests(common.ComputeTestCase):
             # the attached volume had been deleted
             pass
 
+    def test_boot_from_volume(self):
+        # Tests creating a server using --image and --boot-from-volume where
+        # the compute service will create a root volume of the specified size
+        # using the provided image, attach it as the root disk for the server
+        # and not delete the volume when the server is deleted.
+        server_name = uuid.uuid4().hex
+        server = json.loads(self.openstack(
+            'server create -f json ' +
+            '--flavor ' + self.flavor_name + ' ' +
+            '--image ' + self.image_name + ' ' +
+            '--boot-from-volume 1 ' +  # create a 1GB volume from the image
+            self.network_arg + ' ' +
+            '--wait ' +
+            server_name
+        ))
+        self.assertIsNotNone(server["id"])
+        self.assertEqual(
+            server_name,
+            server['name'],
+        )
+        self.wait_for_status(server_name, 'ACTIVE')
+
+        # check server volumes_attached, format is
+        # {"volumes_attached": "id='2518bc76-bf0b-476e-ad6b-571973745bb5'",}
+        cmd_output = json.loads(self.openstack(
+            'server show -f json ' +
+            server_name
+        ))
+        volumes_attached = cmd_output['volumes_attached']
+        self.assertTrue(volumes_attached.startswith('id='))
+        attached_volume_id = volumes_attached.replace('id=', '')
+        # Don't leak the volume when the test exits.
+        self.addCleanup(self.openstack, 'volume delete ' + attached_volume_id)
+
+        # Since the server is volume-backed the GET /servers/{server_id}
+        # response will have image=''.
+        self.assertEqual('', cmd_output['image'])
+
+        # check the volume that attached on server
+        cmd_output = json.loads(self.openstack(
+            'volume show -f json ' +
+            attached_volume_id
+        ))
+        # The volume size should be what we specified on the command line.
+        self.assertEqual(1, int(cmd_output['size']))
+        attachments = cmd_output['attachments']
+        self.assertEqual(
+            1,
+            len(attachments),
+        )
+        self.assertEqual(
+            server['id'],
+            attachments[0]['server_id'],
+        )
+        self.assertEqual(
+            "in-use",
+            cmd_output['status'],
+        )
+        # TODO(mriedem): If we can parse the volume_image_metadata field from
+        # the volume show output we could assert the image_name is what we
+        # specified. volume_image_metadata is something like this:
+        # {u'container_format': u'bare', u'min_ram': u'0',
+        # u'disk_format': u'qcow2', u'image_name': u'cirros-0.4.0-x86_64-disk',
+        # u'image_id': u'05496c83-e2df-4c2f-9e48-453b6e49160d',
+        # u'checksum': u'443b7623e27ecf03dc9e01ee93f67afe', u'min_disk': u'0',
+        # u'size': u'12716032'}
+
+        # delete server, then check the attached volume was not deleted
+        self.openstack('server delete --wait ' + server_name)
+        cmd_output = json.loads(self.openstack(
+            'volume show -f json ' +
+            attached_volume_id
+        ))
+        # check the volume is in 'available' status
+        self.assertEqual('available', cmd_output['status'])
+
     def test_server_create_with_none_network(self):
         """Test server create with none network option."""
         server_name = uuid.uuid4().hex

openstackclient/tests/unit/compute/v2/test_server.py

@@ -1698,6 +1698,33 @@ class TestServerCreate(TestServer):
                           self.cmd.take_action,
                           parsed_args)
 
+    def test_server_create_volume_boot_from_volume_conflict(self):
+        # Tests that specifying --volume and --boot-from-volume results in
+        # an error. Since --boot-from-volume requires --image or
+        # --image-property but those are in a mutex group with --volume, we
+        # only specify --volume and --boot-from-volume for this test since
+        # the validation is not handled with argparse.
+        arglist = [
+            '--flavor', self.flavor.id,
+            '--volume', 'volume1',
+            '--boot-from-volume', '1',
+            self.new_server.name,
+        ]
+        verifylist = [
+            ('flavor', self.flavor.id),
+            ('volume', 'volume1'),
+            ('boot_from_volume', 1),
+            ('config_drive', False),
+            ('server_name', self.new_server.name),
+        ]
+        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
+
+        ex = self.assertRaises(exceptions.CommandError,
+                               self.cmd.take_action, parsed_args)
+        # Assert it is the error we expect.
+        self.assertIn('--volume is not allowed with --boot-from-volume',
+                      six.text_type(ex))
+
     def test_server_create_image_property(self):
         arglist = [
             '--image-property', 'hypervisor_type=qemu',

releasenotes/notes/story-2006302-add-boot-from-volume-cd411b1ca776bb3c.yaml

@@ -0,0 +1,8 @@
+---
+features:
+  - |
+    Add ``--boot-from-volume`` option to the ``server create`` command
+    to create a volume-backed server from the specified image with the
+    specified size when used in conjunction with the ``--image`` or
+    ``--image-property`` options.
+    [Story `2006302 <https://storyboard.openstack.org/#!/story/2006302>`_]