Ensure that OpenStack-CI mirror is used for UCA

The role test implements a test to verify whether it is running in
OpenStack-CI, then discovers the appropriate URL for UCA and
implements it as a fact for the os_nova role to consume.

Change-Id: I60c5575a5ad02d0fa958912bdbc596f2f44e48b0

tests/test-install-nova.yml

@@ -107,6 +107,21 @@
       when: inventory_hostname == groups['nova_all'][0]
       tags:
         - nova-db-setup
+    - name: Check if this is an OpenStack-CI nodepool instance
+      stat:
+        path: /etc/nodepool/provider
+      register: nodepool
+      delegate_to: localhost
+    - name: Determine the existing Ubuntu repo URL (only on OpenStack-CI)
+      shell: 'awk "/^deb .*ubuntu\/? {{ ansible_distribution_release }} main/ {print \$2; exit}" /etc/apt/sources.list'
+      register: ubuntu_repo_url
+      changed_when: false
+      when: nodepool.stat.exists | bool
+      delegate_to: localhost
+    - name: Set Ubuntu Cloud Archive repo URL based on discovered information
+      set_fact:
+        uca_apt_repo_url: "{{ ubuntu_repo_url.stdout | netorigin }}/ubuntu-cloud-archive"
+      when: nodepool.stat.exists | bool
   roles:
     - role: os_nova
   vars_files:

tests/test-prepare-host.yml

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-- name: Perform baisc LXC host setup
+- name: Perform basic LXC host setup
   hosts: localhost
   pre_tasks:
     - name: Ensure root's new public ssh key is in authorized_keys