Perform ironic online data migrations

Online data migrations are necessary for performing an upgrade of
ironic. Without this change, an error such as the following may be seen
in task 'bifrost-ironic-install : Upgrade ironic DB Schema'.

The database is not compatible with this release of ironic (10.1.7).
Please run "ironic-dbsync online_data_migrations" using the previous
release.

Change-Id: I685efd14bf3567a126311b676a50b0abb0f043db
Story: 2004670
Task: 28658

playbooks/roles/bifrost-ironic-install/defaults/main.yml

@@ -30,6 +30,8 @@ skip_package_install: False
 skip_bootstrap: False
 # set to true to skip starting ironic services and dependencies
 skip_start: False
+# set to true to skip performing online data migrations
+skip_migrations: "{{ skip_bootstrap }}"
 
 # Default network interface that bifrost will be attached to.
 # This is used in ipa_* so it must be before

playbooks/roles/bifrost-ironic-install/tasks/main.yml

@@ -62,3 +62,7 @@
 - name: "Start Ironic services"
   include: start.yml
   when: skip_start | bool != True
+
+- name: "Perform online data migrations"
+  include: migrations.yml
+  when: skip_migrations | bool != True

playbooks/roles/bifrost-ironic-install/tasks/migrations.yml

@@ -0,0 +1,22 @@
+# 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.
+---
+- name: "If VENV is set in the environment, enable installation into venv"
+  set_fact:
+    enable_venv: true
+  when: lookup('env', 'VENV') | length > 0
+
+- name: "Perform ironic online data migrations"
+  command: ironic-dbsync --config-file /etc/ironic/ironic.conf online_data_migrations
+  environment: "{{ bifrost_venv_env if enable_venv else {} }}"
+  when: ironic.database.host != 'localhost'

releasenotes/notes/ironic-online-migrations-092aef2b4c2ec75f.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    Adds support for performing ironic online data migrations.