s3_lifecycle: support value '0' for transition_days

changelogs/fragments/1077-s3_lifecycle-transition-days-zero.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - s3_lifecycle - add support of value *0* for ``transition_days`` (https://github.com/ansible-collections/community.aws/pull/1077).

plugins/modules/s3_lifecycle.py

@@ -314,7 +314,7 @@ def build_rule(client, module):
             t_out = dict()
             if transition.get('transition_date'):
                 t_out['Date'] = transition['transition_date']
-            elif transition.get('transition_days'):
+            elif transition.get('transition_days') is not None:
                 t_out['Days'] = transition['transition_days']
             if transition.get('storage_class'):
                 t_out['StorageClass'] = transition['storage_class'].upper()

tests/integration/targets/s3_lifecycle/tasks/main.yml

@@ -180,6 +180,30 @@
         prefix: /something
       register: output
 
+    - assert:
+        that:
+          - output is not changed
+  # ============================================================
+    - name: Create a lifecycle policy, with onezone_ia and transition_days to 0
+      s3_lifecycle:
+        name: '{{ bucket_name }}'
+        transition_days: 0
+        storage_class: onezone_ia
+        prefix: /something
+      register: output
+
+    - assert:
+        that:
+          - output is changed
+  # ============================================================
+    - name: Create a lifecycle policy, with onezone_ia and transition_days to 0 (idempotency)
+      s3_lifecycle:
+        name: '{{ bucket_name }}'
+        transition_days: 0
+        storage_class: onezone_ia
+        prefix: /something
+      register: output
+
     - assert:
         that:
           - output is not changed