Hi folks - In a standalone Python script, I need to enumerate and expand
all host variables from a given Ansible inventory file. In this inventory
file, there are variables which reference other variables using Jinja2
templates, and the level of recursion in those can be 3-4 levels deep. Some
of the vars use Jinja2 tests (such as the version (version_compare) test)
within their templates.
After some experimentation I could combine Ansible libraries with Jinja2 to
do this. But it looks like a lot of work. Is there an intrinsic way to use
ansible Python API and recursively expand all host variables?
FYI, here is what currently works for me:
from ansible.parsing.dataloader import DataLoader
from ansible.inventory.manager import InventoryManager
from ansible.vars.manager import VariableManager
from ansible.plugins.test.core import version_compare
from jinja2 import Template, Environment
sources = ['/project/ansible/conf/hosts']
loader = DataLoader()
inventory = InventoryManager(loader=loader, sources=sources)
variable_manager = VariableManager(loader=loader, inventory=inventory)
myhost = inventory.get_hosts()[0]
vars = variable_manager.get_vars(host = myhost)
environment = Environment()
environment.tests["version"] = version_compare
for k, v in vars.items():
if type(v) == str:
expanded_value = environment.from_string(v)
while True:
expanded_value = expanded_value.render(vars)
if "{{" not in expanded_value:
break
else:
expanded_value = environment.from_string(expanded_value)
print(k, ":", expanded_value)
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