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community.general/lib/ansible/template/template.py
Zac Medico 501fc7a248 template: fix KeyError: 'undefined variable: 0 (#27972)
* template: fix KeyError: 'undefined variable: 0

For compatibility with the Context.get_all() implementation
in jinja 2.9, make AnsibleJ2Vars implement collections.Mapping.
Also, make AnsibleJ2Template.newcontext() handle dict type
for the 'vars' parameter.

See: d67f0fd4cc
Fixes: https://github.com/ansible/ansible/issues/20494

* add units/template/test_vars

* intg tests for jinja-2.9 issues like 20494

test cases here are based on
https://github.com/ansible/ansible/issues/20494#issue-202108318
2017-08-09 18:50:53 -04:00

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Python

# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
# Make coding more python3-ish
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
import jinja2
__all__ = ['AnsibleJ2Template']
class AnsibleJ2Template(jinja2.environment.Template):
'''
A helper class, which prevents Jinja2 from running _jinja2_vars through dict().
Without this, {% include %} and similar will create new contexts unlike the special
one created in template_from_file. This ensures they are all alike, except for
potential locals.
'''
def new_context(self, vars=None, shared=False, locals=None):
if vars is not None:
if isinstance(vars, dict):
vars = vars.copy()
if locals is not None:
vars.update(locals)
else:
vars = vars.add_locals(locals)
return self.environment.context_class(self.environment, vars, self.name, self.blocks)