Use full python package for ansiballz cache filenames (#77090)

* Use full python package for ansiballz cache filenames

* Be a little more explicit about test goals

changelogs/fragments/fqn-module-cache.yml

@@ -0,0 +1,5 @@
+bugfixes:
+- AnsiballZ - Ensure we use the full python package in the module cache filename
+  to avoid a case where ``collections:`` is used to execute a module via short name,
+  where the short name duplicates another module from ``ansible.builtin`` or another
+  collection that was executed previously.

lib/ansible/executor/module_common.py

@@ -1153,7 +1153,7 @@ def _find_module_utils(module_name, b_module_data, module_path, module_args, tas
             compression_method = zipfile.ZIP_STORED
 
         lookup_path = os.path.join(C.DEFAULT_LOCAL_TMP, 'ansiballz_cache')
-        cached_module_filename = os.path.join(lookup_path, "%s-%s" % (module_name, module_compression))
+        cached_module_filename = os.path.join(lookup_path, "%s-%s" % (remote_module_fqn, module_compression))
 
         zipdata = None
         # Optimization -- don't lock if the module has already been cached

test/integration/targets/collections/ansiballz_dupe/collections/ansible_collections/duplicate/name/plugins/modules/ping.py

@@ -0,0 +1,3 @@
+#!/usr/bin/python
+from ansible.module_utils.basic import AnsibleModule
+AnsibleModule({}).exit_json(ping='duplicate.name.pong')

test/integration/targets/collections/ansiballz_dupe/test_ansiballz_cache_dupe_shortname.yml

@@ -0,0 +1,15 @@
+- hosts: localhost
+  gather_facts: false
+  tasks:
+    - ping:
+      register: result1
+
+    - ping:
+      collections:
+        - duplicate.name
+      register: result2
+
+    - assert:
+        that:
+          - result1.ping == 'pong'
+          - result2.ping == 'duplicate.name.pong'

test/integration/targets/collections/runme.sh

@@ -100,6 +100,9 @@ ansible-playbook inventory_test.yml -i a.statichost.yml -i redirected.statichost
 # test plugin loader redirect_list
 ansible-playbook test_redirect_list.yml -v "$@"
 
+# test ansiballz cache dupe
+ansible-playbook ansiballz_dupe/test_ansiballz_cache_dupe_shortname.yml -v "$@"
+
 # test adjacent with --playbook-dir
 export ANSIBLE_COLLECTIONS_PATH=''
 ANSIBLE_INVENTORY_ANY_UNPARSED_IS_FAILED=1 ansible-inventory --list --export --playbook-dir=. -v "$@"