Overcloud update CI with tripleo-upgrade role

This adds update sub-playbook to the multinode playbook, it only gets
executed if overcloud-update tag is set.

Co-Authored-By: Jose Luis Franco <jfrancoa@redhat.com>
Related-Bug: #1749740
Change-Id: I75a358dea33c8befef37aceddeb02e30599d3f7a

playbooks/multinode-overcloud-update.yml

@@ -0,0 +1,50 @@
+# TODO: DRY update and upgrade prep code into update-upgrade-common.yaml
+# https://bugs.launchpad.net/tripleo/+bug/1749740
+- name: Prepare tripleo-upgrade role
+  hosts: undercloud
+  gather_facts: no
+  tags:
+    - overcloud-update
+  vars:
+    tripleo_upgrade_branch: "{{ 'stable/'+release if release!='master' else release }}"
+  tasks:
+    - name: Check if we have a local copy of the tripleo-upgrade role
+      stat:
+        path: /opt/stack/new/tripleo-upgrade
+      register: tripleo_upgrade_local_role
+
+    - name: Set the pip URL when we have a local copy of the role
+      set_fact:
+        tripleo_upgrade_pip_url: "file:///opt/stack/new/tripleo-upgrade#egg=tripleo-upgrade"
+      when: tripleo_upgrade_local_role.stat.exists
+
+    - name: Set the pip URL when we DO NOT have a local copy of the role
+      set_fact:
+        tripleo_upgrade_pip_url: "git+https://git.openstack.org/openstack/tripleo-upgrade.git@{{ tripleo_upgrade_branch }}#egg=tripleo-upgrade"
+      when: not tripleo_upgrade_local_role.stat.exists
+
+    - name: Install tripleo-upgrade role "{{ tripleo_upgrade_branch }}" branch
+      pip:
+        name: "{{ tripleo_upgrade_pip_url }}"
+        executable: "{{ local_working_dir }}/bin/pip"
+
+- name: Update overcloud
+  hosts: undercloud
+  gather_facts: no
+  tags:
+    - overcloud-update
+  vars:
+    tripleo_upgrade_branch: "{{ 'stable/'+release if release!='master' else release }}"
+    # NOTE: right now the container images stay the same before and
+    # after update. This makes the job run fast while still testing
+    # the update workflow itself. For the future we may consider
+    # updating the container images too. (This might have to be paired
+    # with some work on the image building side to get meaningful
+    # from-to combination of images.
+    container_registry_file: containers-default-parameters.yaml
+  tasks:
+    - when: overcloud_update|default(false)|bool
+      block:
+        - name: Run update via tripleo-upgrade role
+          include_role:
+            name: tripleo-upgrade

playbooks/multinode.yml

@@ -3,5 +3,6 @@
 - include: multinode-undercloud.yml
 - include: multinode-overcloud-prep.yml
 - include: multinode-overcloud.yml
+- include: multinode-overcloud-update.yml
 - include: multinode-overcloud-upgrade.yml
 - include: multinode-validate.yml