Only build venvs for services which are deployed

The current repo build process builds venvs for all OpenStack services,
regardless of whether they're actually going to be used.

To reduce the repo build time, this patch will only build venvs for
OpenStack services where there is one or more members in the service
inventory group.

Change-Id: If966de6f2b8d972e9addc3385b8de5c13a986cc1

defaults/main.yml

@@ -26,6 +26,9 @@ repo_build_pool_dir: "/var/www/repo/pools"
 
 repo_build_release_tag: "untagged"
 
+# Toggle whether venvs should be built selectively or not
+repo_build_venv_selective: yes
+
 # Optionally set this to change the default index from pypi to an alternative
 #repo_build_pip_default_index: "https://pypi.python.org/simple"
 

releasenotes/notes/selective-venv-build-dd9f0e40cd1cc076.yaml

@@ -0,0 +1,8 @@
+---
+features:
+  - The repo build process now selectively builds venvs based on
+    whether each OpenStack service group has any hosts in it. If
+    there are no hosts in the group, the venv will not be built.
+    This behaviour can be optionally changed to force all venvs
+    to be built by setting ``repo_build_venv_selective`` to
+    ``yes``.

templates/op-venv-script.sh.j2

@@ -47,7 +47,8 @@ function venv_create {
 #        purposes the group data will be rendered as a comment.
 {% set os_group = {} %}
 {% for key, value in local_packages.results.0.item.role_packages.items() %}
-{% if "os_" in key %}
+{% set _host_group = key | replace('os_', '') + '_all' %}
+{% if ("os_" in key) and (not repo_build_venv_selective | bool) or ((groups[_host_group] is defined) and (groups[_host_group] | length > 0)) %}
 # venv to build {{ key }}
 #   * packages within the {{ key }} venv: {{ value }}
 {% set _ = os_group.update({key: value}) %}

tests/inventory

@@ -7,3 +7,7 @@ container1
 
 [all_containers:children]
 repo_all
+
+# This is here to validate the venv build inclusion
+[keystone_all]
+container1

tests/test-repo-build.yml

@@ -39,5 +39,15 @@
   roles:
     - "repo_server"
     - "{{ rolename | basename }}"
+  post_tasks:
+    - name: List the files in the venv folder
+      command: ls -1 /var/www/repo/venvs/{{ repo_build_release_tag }}/{{ ansible_distribution | lower }}/
+      register: venv_folder_content
+    - name: Ensure that the keystone venv is present
+      assert:
+        that: "'keystone-{{ repo_build_release_tag }}.tgz' in venv_folder_content.stdout"
+    - name: Ensure that the nova venv is NOT present
+      assert:
+        that: "'nova-{{ repo_build_release_tag }}.tgz' not in venv_folder_content.stdout"
   vars_files:
     - test-vars.yml

tests/test-vars.yml

@@ -14,6 +14,7 @@
 # limitations under the License.
 
 openstack_release: testing
+repo_build_release_tag: "{{ openstack_release }}"
 galera_client_drop_config_file: false
 local_packages:
   results: