fixup! dnfplugin.py: Update err msgs and handle transaction issues better

Author: pirat89

repos/system_upgrade/common/libraries/dnfplugin.py

@@ -173,7 +173,7 @@ def _handle_transaction_err_msg(stage, xfs_info, err, is_container=False):
     # ignore the fallback when the error is related to the container issue
     # e.g. installation of packages inside the container; so it's unrelated
     # to the upgrade transactions.
-    if get_env('LEAPP_OVL_LEGACY', '0') != '1' and not is_container:
+    if get_env('LEAPP_OVL_LEGACY', '0') == '1' and not is_container:
         _handle_transaction_err_msg_old(stage, xfs_info, err)
         return  # not needed actually as the above function raises error, but for visibility
     NO_SPACE_STR = 'more space needed on the'
@@ -212,7 +212,7 @@ def _handle_transaction_err_msg(stage, xfs_info, err, is_container=False):
             ' provide reasonably more free space (e.g. when 200 MB is missing'
             ' on /usr, add 1200MB or more).'
         )
-        details = {'hint': hint, 'Disk Requirements': missing_space}
+        details = {'hint': hint, 'Disk Requirements': '\n'.join(missing_space)}
 
     raise StopActorExecutionError(message=message, details=details)