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fix precedence issue with facts and vars (#32302)

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avoid making gathered facts high precedence, only set_fact is supposed to be.
vars set via set_fact with cacheable are higher precedence than plain facts.

Previously (after 6fbd0a8bb5) regular facts would end up with a
higher precedence than host or play vars, but they should not be. Facts were getting added to 'non_persistent_facts' (equivalent to 'register' vars) which is higher precedence than facts should be.

added 'cacheable set_facts' to precedence docs

'ansible_facts_cacheable' ->  '_ansible_facts_cacheable' (made 'private')
This commit is contained in:
Brian Coca 2017-11-01 11:42:17 -04:00 committed by Adrian Likins
parent d1e55551e9
commit 41685fb516
3 changed files with 8 additions and 7 deletions
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4
docs/docsite/rst/playbooks_variables.rst
View file

@ -865,7 +865,7 @@ In 2.x, we have made the order of precedence more specific (with the last listed
* inventory file or script host vars [2]_
* inventory host_vars/*
* playbook host_vars/*
* host facts
* host facts / cached set_facts [3]_
* play vars
* play vars_prompt
* play vars_files
@ -884,6 +884,8 @@ Basically, anything that goes into "role defaults" (the defaults folder inside t
.. [1] Tasks in each role will see their own role's defaults. Tasks defined outside of a role will see the last role's defaults.
.. [2] Variables defined in inventory file or provided by dynamic inventory.
.. [3] When created with set_facts's cacheable option, variables will have the high precedence in the play,
but will be the same as a host facts precedence when they come from the cache.
.. note:: Within any section, redefining a var will overwrite the previous instance.
If multiple groups have the same variable, the last one loaded wins.

2
lib/ansible/plugins/action/set_fact.py
View file

@ -54,5 +54,5 @@ class ActionModule(ActionBase):
result['changed'] = False
result['ansible_facts'] = facts
result['ansible_facts_cacheable'] = cacheable
result['_ansible_facts_cacheable'] = cacheable
return result

9
lib/ansible/plugins/strategy/__init__.py
View file

@ -511,13 +511,12 @@ class StrategyBase:
for target_host in host_list:
self._variable_manager.set_host_variable(target_host, var_name, var_value)
else:
cacheable = result_item.pop('ansible_facts_cacheable', True)
cacheable = result_item.pop('_ansible_facts_cacheable', False)
for target_host in host_list:
if cacheable:
if not original_task.action == 'set_fact' or cacheable:
self._variable_manager.set_host_facts(target_host, result_item['ansible_facts'].copy())
# If we are setting a fact, it should populate non_persistent_facts as well
self._variable_manager.set_nonpersistent_facts(target_host, result_item['ansible_facts'].copy())
if original_task.action == 'set_fact':
self._variable_manager.set_nonpersistent_facts(target_host, result_item['ansible_facts'].copy())
if 'ansible_stats' in result_item and 'data' in result_item['ansible_stats'] and result_item['ansible_stats']['data']: