Update to have a new flag for updating the staticfiles KEY_PREFIX.

playbooks/roles/edxapp/defaults/main.yml

@@ -147,6 +147,8 @@ EDXAPP_LOCAL_GIT_IDENTITY: !!null
 # Configuration for database migration
 EDXAPP_TEST_MIGRATE_DB_NAME: "{{ COMMON_ENVIRONMENT }}_{{ COMMON_DEPLOYMENT }}_test_{{ EDXAPP_MYSQL_DB_NAME }}"
 
+EDXAPP_UPDATE_STATIC_FILES_KEY: false
+
 #-------- Everything below this line is internal to the role ------------
 
 #Use YAML references (& and *) and hash merge <<: to factor out shared settings

playbooks/roles/edxapp/tasks/deploy.yml

@@ -10,16 +10,16 @@
 - name: Get current time
   shell: 'date +%s'
   register: time_in_seconds
+  when: EDXAPP_UPDATE_STATIC_FILES_KEY
 
 - name: Update the static_files_key_prefix
   set_fact:
-    EDXAPP_ENV_EXTRA:
-      CACHES:
-        staticfiles:
-          KEY_PREFIX: '{{time_in_seconds.stdout}}'
+    edxapp_dynamic_cache_key: '{{time_in_seconds.stdout}}'
+  when: EDXAPP_UPDATE_STATIC_FILES_KEY
 
 - name: Print out the staticfiles prefix
   debug: msg="Setting static_files_cache_prefix to {{time_in_seconds.stdout}}"
+  when: EDXAPP_UPDATE_STATIC_FILES_KEY
 
 # Optional auth for git
 - name: create ssh script for git (not authenticated)

playbooks/roles/edxapp/templates/lms.env.json.j2

 {% do lms_env_config.update(EDXAPP_ENV_EXTRA) %}
+{% if EDXAPP_UPDATE_STATIC_FILES_KEY %}
+  {%- do lms_env_config['CACHES']['staticfiles'].update({'KEY_PREFIX': edxapp_dynamic_cache_key}) %}
+{% endif %}
 {{ lms_env_config | to_nice_json }}