api/ec2/ebs: make metadata returns correct swap and ephemeral0

nova/api/ec2/cloud.py

@@ -272,6 +272,12 @@ class CloudController(object):
         mappings = {}
         mappings['ami'] = block_device.strip_dev(root_device_name)
         mappings['root'] = root_device_name
+        default_local_device = instance_ref.get('default_local_device')
+        if default_local_device:
+            mappings['ephemeral0'] = default_local_device
+        default_swap_device = instance_ref.get('default_swap_device')
+        if default_swap_device:
+            mappings['swap'] = default_swap_device
         ebs_devices = []
 
         # 'ephemeralN', 'swap' and ebs

nova/db/sqlalchemy/migrate_repo/versions/046_add_instance_swap.py

@@ -0,0 +1,48 @@
+# Copyright 2011 Isaku Yamahata
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from sqlalchemy import Column, Integer, MetaData, Table, String
+
+meta = MetaData()
+
+default_local_device = Column(
+    'default_local_device',
+    String(length=255, convert_unicode=False, assert_unicode=None,
+           unicode_error=None, _warn_on_bytestring=False),
+    nullable=True)
+
+default_swap_device = Column(
+    'default_swap_device',
+    String(length=255, convert_unicode=False, assert_unicode=None,
+           unicode_error=None, _warn_on_bytestring=False),
+    nullable=True)
+
+instances = Table('instances', meta,
+        Column('id', Integer(), primary_key=True, nullable=False),
+        )
+
+
+def upgrade(migrate_engine):
+    # Upgrade operations go here. Don't create your own engine;
+    # bind migrate_engine to your metadata
+    meta.bind = migrate_engine
+    instances.create_column(default_local_device)
+    instances.create_column(default_swap_device)
+
+
+def downgrade(migrate_engine):
+    # Operations to reverse the above upgrade go here.
+    meta.bind = migrate_engine
+    instances.drop_column('default_swap_device')
+    instances.drop_column('default_local_device')

nova/db/sqlalchemy/models.py

@@ -232,6 +232,8 @@ class Instance(BASE, NovaBase):
     uuid = Column(String(36))
 
     root_device_name = Column(String(255))
+    default_local_device = Column(String(255), nullable=True)
+    default_swap_device = Column(String(255), nullable=True)
     config_drive = Column(String(255))
 
     # User editable field meant to represent what ip should be used

nova/virt/libvirt/connection.py

@@ -1111,6 +1111,11 @@ class LibvirtConnection(driver.ComputeDriver):
                 nova_context.get_admin_context(), instance['id'],
                 {'root_device_name': '/dev/' + self.default_root_device})
 
+        if local_device:
+            db.instance_update(
+                nova_context.get_admin_context(), instance['id'],
+                {'default_local_device': '/dev/' + self.default_local_device})
+
         swap = driver.block_device_info_get_swap(block_device_info)
         if driver.swap_is_usable(swap):
             xml_info['swap_device'] = block_device.strip_dev(
@@ -1119,6 +1124,9 @@ class LibvirtConnection(driver.ComputeDriver):
               not self._volume_in_mapping(self.default_swap_device,
                                           block_device_info)):
             xml_info['swap_device'] = self.default_swap_device
+            db.instance_update(
+                nova_context.get_admin_context(), instance['id'],
+                {'default_swap_device': '/dev/' + self.default_swap_device})
 
         config_drive = False
         if instance.get('config_drive') or instance.get('config_drive_id'):