Remove downgrade from existing migrations

Remove downgrade from all existing migrations.

Related cross-project spec: https://review.openstack.org/152337

Change-Id: I39135d99278b6bba13b5f09ffa382b87051d09ad
Partial-Bug: 1434103

magnum/cmd/db_manage.py

@@ -33,10 +33,6 @@ def do_upgrade(mgr):
     mgr.upgrade(CONF.command.revision)
 
 
-def do_downgrade(mgr):
-    mgr.downgrade(CONF.command.revision)
-
-
 def do_stamp(mgr):
     mgr.stamp(CONF.command.revision)
 
@@ -54,10 +50,6 @@ def add_command_parsers(subparsers):
     parser.add_argument('revision', nargs='?')
     parser.set_defaults(func=do_upgrade)
 
-    parser = subparsers.add_parser('downgrade')
-    parser.add_argument('revision', nargs='?')
-    parser.set_defaults(func=do_downgrade)
-
     parser = subparsers.add_parser('stamp')
     parser.add_argument('revision')
     parser.set_defaults(func=do_stamp)

magnum/db/migration.py

@@ -36,10 +36,6 @@ def upgrade(version=None):
     return get_backend().upgrade(version)
 
 
-def downgrade(version=None):
-    return get_backend().downgrade(version)
-
-
 def version():
     return get_backend().version()
 

magnum/db/sqlalchemy/alembic/README

@@ -9,7 +9,3 @@ $ magnum-db-manage stamp head
 Upgrade can be performed by:
 $ magnum-db-manage upgrade
 $ magnum-db-manage upgrade head
-
-Downgrading db:
-$ magnum-db-manage downgrade
-$ magnum-db-manage downgrade base

magnum/db/sqlalchemy/alembic/script.py.mako

@@ -16,7 +16,3 @@ ${imports if imports else ""}
 
 def upgrade():
     ${upgrades if upgrades else "pass"}
-
-
-def downgrade():
-    ${downgrades if downgrades else "pass"}

magnum/db/sqlalchemy/alembic/versions/1afee1db6cd0_add_master_flavor.py

@@ -28,7 +28,3 @@ import sqlalchemy as sa
 def upgrade():
     op.add_column('baymodel', sa.Column('master_flavor_id',
                   sa.String(length=255), nullable=True))
-
-
-def downgrade():
-    op.drop_column('baymodel', 'master_flavor_id')

magnum/db/sqlalchemy/alembic/versions/2581ebaf0cb2_initial_migration.py

@@ -135,16 +135,3 @@ def upgrade():
         mysql_DEFAULT_CHARSET='UTF8'
     )
     # end Alembic commands
-
-
-def downgrade():
-    op.drop_table('bay')
-    op.drop_table('baymodel')
-    op.drop_table('container')
-    op.drop_table('node')
-    op.drop_table('service')
-    op.drop_table('pod')
-    op.drop_table('replicationcontroller')
-# We should probably remove the drops later ;-)
-#    raise NotImplementedError(('Downgrade from initial migration is'
-#                              ' unsupported.'))

magnum/db/sqlalchemy/alembic/versions/2d1354bbf76e_ssh_authorized_key.py

@@ -32,7 +32,3 @@ import sqlalchemy as sa
 def upgrade():
     op.add_column('baymodel', sa.Column('ssh_authorized_key',
                   sa.Text, nullable=True))
-
-
-def downgrade():
-    op.drop_column('baymodel', 'ssh_authorized_key')

magnum/db/sqlalchemy/alembic/versions/35cff7c86221_add_private_network_to_baymodel.py

@@ -30,7 +30,3 @@ import sqlalchemy as sa
 def upgrade():
     op.add_column('baymodel', sa.Column('fixed_network', sa.String(length=255),
                   nullable=True))
-
-
-def downgrade():
-    op.drop_column('baymodel', 'fixed_network')

magnum/db/sqlalchemy/alembic/versions/3a938526b35d_add_docker_volume_size.py

@@ -32,7 +32,3 @@ import sqlalchemy as sa
 def upgrade():
     op.add_column('baymodel', sa.Column('docker_volume_size', sa.Integer(),
                   nullable=True))
-
-
-def downgrade():
-    op.drop_column('baymodel', 'docker_volume_size')

magnum/db/sqlalchemy/alembic/versions/3bea56f25597_multi_tenant.py

@@ -55,20 +55,3 @@ def upgrade():
                   sa.String(length=255), nullable=True))
     op.add_column('replicationcontroller', sa.Column('user_id',
                   sa.String(length=255), nullable=True))
-
-
-def downgrade():
-    op.drop_column('bay', 'project_id')
-    op.drop_column('bay', 'user_id')
-    op.drop_column('baymodel', 'project_id')
-    op.drop_column('baymodel', 'user_id')
-    op.drop_column('container', 'project_id')
-    op.drop_column('container', 'user_id')
-    op.drop_column('node', 'project_id')
-    op.drop_column('node', 'user_id')
-    op.drop_column('pod', 'project_id')
-    op.drop_column('pod', 'user_id')
-    op.drop_column('service', 'project_id')
-    op.drop_column('service', 'user_id')
-    op.drop_column('replicationcontroller', 'project_id')
-    op.drop_column('replicationcontroller', 'user_id')

magnum/db/sqlalchemy/alembic/versions/5793cd26898d_add_bay_status.py

@@ -28,7 +28,3 @@ import sqlalchemy as sa
 def upgrade():
     op.add_column('bay', sa.Column('status', sa.String(length=20),
                   nullable=True))
-
-
-def downgrade():
-    op.drop_column('bay', 'status')