BIOS Settings: Add DB model

Adds the following items for BIOS Setting operations:

* bios_settings table
* database migration
* BIOSSetting object entry

Co-Authored-By: Yolanda Robla Mota <yroblamo@redhat.com>
Depends-On: I48c96d5da0cb747b3ca3fceea9b4ffa85a9ebe22
Change-Id: Ia2c14c5674e34decaa075c2754e7a552bbb1beab
Story: #1712032

ironic/db/sqlalchemy/alembic/versions/82c315d60161_add_bios_settings.py

@@ -0,0 +1,42 @@
+#    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.
+
+"""add bios settings
+
+Revision ID: 82c315d60161
+Revises: e918ff30eb42
+Create Date: 2017-10-11 14:56:47.813290
+
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = '82c315d60161'
+down_revision = 'e918ff30eb42'
+
+
+def upgrade():
+    op.create_table(
+        'bios_settings',
+        sa.Column('node_id', sa.Integer(), nullable=False),
+        sa.Column('created_at', sa.DateTime(), nullable=True),
+        sa.Column('updated_at', sa.DateTime(), nullable=True),
+        sa.Column('name', sa.String(length=255), nullable=False),
+        sa.Column('value', sa.Text(), nullable=True),
+        sa.Column('version', sa.String(length=15), nullable=True),
+        sa.ForeignKeyConstraint(['node_id'], ['nodes.id'], ),
+        sa.PrimaryKeyConstraint('node_id', 'name'),
+        mysql_ENGINE='InnoDB',
+        mysql_DEFAULT_CHARSET='UTF8'
+    )

ironic/db/sqlalchemy/models.py

@@ -300,6 +300,17 @@ class NodeTrait(Base):
     )
 
 
+class BIOSSetting(Base):
+    """Represents a bios setting of a bare metal node."""
+
+    __tablename__ = 'bios_settings'
+    __table_args__ = (table_args())
+    node_id = Column(Integer, ForeignKey('nodes.id'),
+                     primary_key=True, nullable=False)
+    name = Column(String(255), primary_key=True, nullable=False)
+    value = Column(Text, nullable=True)
+
+
 def get_class(model_name):
     """Returns the model class with the specified name.
 

ironic/tests/unit/common/test_release_mappings.py

@@ -84,7 +84,7 @@ class ReleaseMappingsTestCase(base.TestCase):
         self.assertIn('master', release_mappings.RELEASE_MAPPING)
         model_names = set((s.__name__ for s in models.Base.__subclasses__()))
         exceptions = set(['NodeTag', 'ConductorHardwareInterfaces',
-                          'NodeTrait'])
+                          'NodeTrait', 'BIOSSetting'])
         # NOTE(xek): As a rule, all models which can be changed between
         # releases or are sent through RPC should have their counterpart
         # versioned objects.

ironic/tests/unit/db/sqlalchemy/test_migrations.py

@@ -667,6 +667,44 @@ class MigrationCheckersMixin(object):
             node_traits.c.node_id == data['id']).execute().first()
         self.assertEqual('trait1', trait['trait'])
 
+    def _pre_upgrade_82c315d60161(self, engine):
+        # Create a node to which bios setting can be added.
+        data = {'uuid': uuidutils.generate_uuid()}
+        nodes = db_utils.get_table(engine, 'nodes')
+        nodes.insert().execute(data)
+        node = nodes.select(nodes.c.uuid == data['uuid']).execute().first()
+        data['id'] = node['id']
+        return data
+
+    def _check_82c315d60161(self, engine, data):
+        bios_settings = db_utils.get_table(engine, 'bios_settings')
+        col_names = [column.name for column in bios_settings.c]
+        expected_names = ['node_id', 'created_at', 'updated_at',
+                          'name', 'value', 'version']
+        self.assertEqual(sorted(expected_names), sorted(col_names))
+        self.assertIsInstance(bios_settings.c.node_id.type,
+                              sqlalchemy.types.Integer)
+        self.assertIsInstance(bios_settings.c.created_at.type,
+                              sqlalchemy.types.DateTime)
+        self.assertIsInstance(bios_settings.c.updated_at.type,
+                              sqlalchemy.types.DateTime)
+        self.assertIsInstance(bios_settings.c.name.type,
+                              sqlalchemy.types.String)
+        self.assertIsInstance(bios_settings.c.version.type,
+                              sqlalchemy.types.String)
+        self.assertIsInstance(bios_settings.c.value.type,
+                              sqlalchemy.types.Text)
+
+        setting = {'node_id': data['id'],
+                   'name': 'virtualization',
+                   'value': 'on'}
+        bios_settings.insert().execute(setting)
+        setting = bios_settings.select(
+            sqlalchemy.sql.and_(
+                bios_settings.c.node_id == data['id'],
+                bios_settings.c.name == setting['name'])).execute().first()
+        self.assertEqual('on', setting['value'])
+
     def test_upgrade_and_version(self):
         with patch_with_engine(self.engine):
             self.migration_api.upgrade('head')