Allow the split of install and config

If keystone install is done separately from the config (filtering
or interruption), a re-run of the role will not mark the venv
as changed, and the db sync will not trigger.

Here we force a flush on file next to the venv change, and use
this file (local fact) as a way to know if a db sync is required.

When a dbsync is considered done, i.e after the expand and migrate
stages, we mark the db_migrate as done for all the nodes.

Change-Id: I318700582a65cc1ea6571d9460fd58bed949a4e9
Depends-On: Ie4a47e85bf31e1ac3a2bd6f0dec510bb24abdbbd

tasks/keystone_db_setup.yml

@@ -50,5 +50,6 @@
 - name: Check if Keystone DB sync contract is required
   command: "true"
   changed_when: keystone_db_sync_check.rc == 4
+  register: dbsync
   notify:
     - Perform a Keystone DB sync contract

tasks/keystone_install.yml

@@ -251,3 +251,13 @@
       dest: admin
     - src: "{{ keystone_bin }}/keystone-wsgi-public"
       dest: main
+
+- name: Record the need for a db sync
+  ini_file:
+    dest: /etc/ansible/facts.d/keystone.fact
+    section: general
+    option: need_db_sync
+    value: True
+  when: keystone_get_venv | changed or
+        keystone_venv_dir | changed or
+        install_packages | changed

tasks/main.yml

@@ -50,6 +50,12 @@
   tags:
     - keystone-install
 
+- name: refresh local facts
+  setup:
+    filter: ansible_local
+  tags:
+    - keystone-config
+
 - include: keystone_post_install.yml
   tags:
     - keystone-config
@@ -81,10 +87,18 @@
 - include: keystone_db_setup.yml
   when:
     - keystone_database_enabled | bool
-    - inventory_hostname == groups['keystone_all'][0]
-    - (keystone_get_venv is defined and keystone_get_venv | changed) or
-        (keystone_venv_dir is defined and keystone_venv_dir | changed) or
-          (install_packages is defined and install_packages | changed)
+    - inventory_hostname == ansible_play_hosts[0]
+    - ansible_local.keystone.general.need_db_sync | bool
+  tags:
+    - keystone-config
+
+- name: Disable the need of a db sync on all nodes
+  ini_file:
+    dest: /etc/ansible/facts.d/keystone.fact
+    section: general
+    option: need_db_sync
+    value: False
+  when: dbsync | succeeded
   tags:
     - keystone-config