Capture sanity check warnings and display them

Captures runtime warnings raise by driver.sanity_check() and
display them at the end in case of failure.

Related: ansible-community/molecule-podman#76

src/molecule/provisioner/ansible_playbook.py

@@ -20,6 +20,7 @@
 """Ansible-Playbook Provisioner Module."""
 
 import logging
+import warnings
 
 from molecule import util
 
@@ -103,12 +104,18 @@ def execute(self):
             LOG.warning("Skipping, %s action has no playbook." % self._config.action)
             return
 
-        self._config.driver.sanity_checks()
-        result = util.run_command(self._ansible_command, debug=self._config.debug)
+        # breakpoint()
+        with warnings.catch_warnings(record=True) as warns:
+            # warnings.simplefilter("ignore")
+            self._config.driver.sanity_checks()
+            result = util.run_command(self._ansible_command, debug=self._config.debug)
+
+        # print(warns)
         if result.returncode != 0:
             util.sysexit_with_message(
                 f"Ansible return code was {result.returncode}, command was: {result.args}",
                 result.returncode,
+                warns=warns,
             )
 
         return result.stdout

src/molecule/util.py

@@ -96,7 +96,10 @@ def sysexit(code: int = 1) -> NoReturn:
 
 
 def sysexit_with_message(
-    msg: str, code: int = 1, detail: Optional[MutableMapping] = None
+    msg: str,
+    code: int = 1,
+    detail: Optional[MutableMapping] = None,
+    warns: Optional[List[Warning]] = None,
 ) -> None:
     """Exit with an error message."""
     # detail is usually a multi-line string which is not suitable for normal
@@ -108,6 +111,9 @@ def sysexit_with_message(
             detail_str = str(detail)
         print(detail_str)
     LOG.critical(msg)
+    if warns:
+        for warn in warns:
+            LOG.warning(warn.__dict__['message'].args[0])
     sysexit(code)