Steve Kuznetsov 0bc35354ce Change v2_playbook_on_start logic to positively detect legacy plugins ... In order to support legacy plugins, the following two method signatures are allowed for `CallbackBase.v2_playbook_on_start`: def v2_playbook_on_start(self): def v2_playbook_on_start(self, playbook): Previously, the logic to handle this divergence checked to see if the callback plugin being called supported an argument named `playbook` in its `v2_playbook_on_start` method. This was fragile in a few ways: - if a plugin author did not use the literal `playbook` to name their method argument, their plugin would not be called correctly - if a plugin author wrapped their `v2_playbook_on_start` method and by doing so changed the argspec to no longer expose an argument with that literal name, their plugin would not be called correctly In order to continue to support both types of callback for backwards compatibility while making the call more robust for plugin authors, the logic can be reversed in order to have a positive check for the old method signature instead of a positive check for the new one. Signed-off-by: Steve Kuznetsov <skuznets@redhat.com>		2016-10-28 10:05:58 -07:00
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ansible	Change v2_playbook_on_start logic to positively detect legacy plugins	2016-10-28 10:05:58 -07:00