Fix docker_container_exec's detach=true. (#1145) (#1148)

(cherry picked from commit 449b37e1c9)

changelogs/fragments/1145-fix.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - "docker_container_exec - make ``detach=true`` work. So far this resulted in no execution being done (https://github.com/ansible-collections/community.docker/pull/1145)."

plugins/module_utils/_api/api/client.py

@@ -580,6 +580,7 @@ class APIClient(
 
     def post_json_to_text(self, pathfmt, *args, **kwargs):
         data = kwargs.pop('data', None)
+        return self._result(self._post_json(self._url(pathfmt, *args, versioned_api=True), data, **kwargs))
 
     def post_json_to_stream_socket(self, pathfmt, *args, **kwargs):
         data = kwargs.pop('data', None)

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

@@ -180,7 +180,7 @@
         argv:
           - /bin/sh
           - '-c'
-          - sleep 1m
+          - echo "Detach worked." > /result.txt
         detach: true
       register: result
 
@@ -215,6 +215,24 @@
           - result.stderr == 'bar baz'
           - result.stderr_lines == ['bar baz']
 
+    - name: Check result of detach test
+      docker_container_exec:
+        container: "{{ cname }}"
+        argv:
+          - /bin/sh
+          - '-c'
+          - cat /result.txt
+        strip_empty_ends: false
+      register: result
+
+    - assert:
+        that:
+          - result.rc == 0
+          - result.stdout == 'Detach worked.\n'
+          - result.stdout_lines == ['Detach worked.']
+          - result.stderr == ''
+          - result.stderr_lines == []
+
   always:
     - name: Cleanup
       docker_container: