* Revert "There can be only one localhost"
This reverts commit 5f1bbb4fcd.
this broke several usages of localhost, see #16882, #16898 and #16886
* ensure there is only 1 localhost
fixes#16886, #16882 and #16898
- make sure localhost exists before returning it
- optimzed host caching
- ensure we always return a host object
This bug was introduced in 3ced6d3, where getting vars from a role
did not follow the dep chain. This was originally hidden by the fact
that we got vars twice (from the block and from the roles directly).
Fixes#16729
Also updates doc on variable precedence, as it was incorrect for the
order of play vars/vars_prompt/vars_files in relation to set_fact and
registered variables.
Fixes#14702Fixes#14826
* In the VariableManager, we were not properly tracking if a file
had already been loaded, so we continuously append data to the end
of the list there for host and group vars, meaning large sets of data
are duplicated multiple times
* In the inventory, we were merging the host/group vars with the vars
local to the host needlessly, as the VariableManager already handles that.
This leads to needless duplication of the data and makes combining the
vars in VariableManager take even longer.
Child blocks (whether nested or via includes) don't get a copy of the
dependency chain, so the above method should be used to ensure the block
looks at its parents dep chain.
Fixes#15996
In VariableManager, we fetch the params specifically in the next step,
so including them in the prior step is unnecessary and could lead to things
being overridden in an improper order.
In Block, we should not be getting the params for the role as they are
included earlier via the VariableManager.
Fixes#14411
* Make role param resolution follow the role dependency chain, rather
than using all roles within the play
* Also move params to be merged in after role vars in general, to match
our variable precedence rules
* Changes to the way var lookup is done in role helper methods for
get_vars(), get_inherited_vars(), and get_role_params() to make the
above possible without trampling on previously merged vars
Fixes#14472Fixes#14475
Looks like someone forgot to create an instance of undefined here- we were returning the undefined type object, which broke all the undefined checks.
Added an integration test around add_host that will catch this (separate PR to follow)
Also displays a warning now, because users should not be using that variable
name as it causes a collision with the internal variable of the same name.
