dnf: obey the keepcache setting (#82735)

Fixes #81954

changelogs/fragments/81954-dnf-keepcache.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - "dnf - fix an issue when cached RPMs were left in the cache directory even when the keepcache setting was unset (https://github.com/ansible/ansible/issues/81954)"

lib/ansible/modules/dnf.py

@@ -1438,8 +1438,10 @@ class DnfModule(YumDnf):
 
             if self.with_modules:
                 self.module_base = dnf.module.module_base.ModuleBase(self.base)
-
+            try:
                 self.ensure()
+            finally:
+                self.base.close()
 
 
 def main():

test/integration/targets/dnf/tasks/dnf.yml

@@ -67,6 +67,17 @@
     update_cache: True
   register: dnf_result
 
+- find:
+    paths: /var/cache/dnf
+    patterns: "*.rpm"
+    recurse: true
+  register: r
+
+- name: verify that RPM cache is cleared after installation as keepcache is off by default
+  assert:
+    that:
+      - r.matched == 0
+
 - name: check sos with rpm
   shell: rpm -q sos
   failed_when: False