container: reset variables in role init, define more defaults outside tasks

roles/container/tasks/init.yml

@@ -1,12 +1,18 @@
 ---
 
+- name: Reset variables
+  set_fact:
+    docker_volume_definition: []
+    container_published_ports: []
+    final_docker_volumes: "{{ docker_volumes }}"
+
 - name: Set docker service full name
   set_fact:
     docker_service_name: "{{ docker_service }}_{{ docker_service_suffix }}"
   when: docker_service_suffix is defined
 
 - name: Convert docker_volumes from legacy format
-  when: docker_volumes is defined and docker_volumes[0] is not mapping
+  when: docker_volumes | length > 0 and docker_volumes[0] is not mapping
   block:
     - name: Warn about docker_volumes legacy format
       debug:

roles/container/tasks/main.yml

@@ -57,8 +57,8 @@
     image: "{{ docker_built_image.image.Id if dockerfile is defined and not ansible_check_mode else docker_image }}"
     user: "{{ docker_user | default(omit) }}"
     pull: "{{ dockerfile is not defined }}"
-    volumes: "{{ docker_volume_definition | default(omit) }}"
-    published_ports: "{{ container_published_ports | default([]) + docker_published_ports | default(omit) }}"
+    volumes: "{{ docker_volume_definition }}"
+    published_ports: "{{ container_published_ports + docker_published_ports }}"
     labels: "{{ traefik_labels | default(omit) }}"
     env: "{{ docker_env | combine(docker_additional_env) }}"
     entrypoint: "{{ docker_entrypoint | default(omit) }}"

roles/container/tasks/volumes.yml

@@ -38,18 +38,18 @@
       loop: "{{ docker_volumes }}"
     - name: Set docker_volume_definition for named binds
       set_fact:
-        docker_volume_definition: "{{ docker_volume_definition | default([]) + [docker_mounts_dir + '/' + item.name + ':' + item.path] }}"
+        docker_volume_definition: "{{ docker_volume_definition + [docker_mounts_dir + '/' + item.name + ':' + item.path] }}"
       when: item.name is defined
       loop: "{{ docker_volumes }}"
 
 - name: Set docker_volume_definition for src binds
   set_fact:
-    docker_volume_definition: "{{ docker_volume_definition | default([]) + [item.src + ':' + item.path] }}"
+    docker_volume_definition: "{{ docker_volume_definition + [item.src + ':' + item.path] }}"
   when: item.src is defined
   loop: "{{ final_docker_volumes }}"
 
 - name: Set docker_volume_definition for named volumes
   set_fact:
-    docker_volume_definition: "{{ docker_volume_definition | default([]) + [item.name + ':' + item.path] }}"
+    docker_volume_definition: "{{ docker_volume_definition + [item.name + ':' + item.path] }}"
   when: docker_volume_type == 'named' and item.name is defined
   loop: "{{ final_docker_volumes }}"