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# (c) 2017 Ansible Project
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
DOCUMENTATION = """
name: varnames
author: Ansible Core Team
version_added: "2.8"
short_description: Lookup matching variable names
description:
- Retrieves a list of matching Ansible variable names.
options:
_terms:
description: List of Python regex patterns to search for in variable names.
required: True
"""
EXAMPLES = """
- name: List variables that start with qz_
ansible.builtin.debug: msg="{{ lookup('ansible.builtin.varnames', '^qz_.+')}}"
vars:
qz_1: hello
qz_2: world
qa_1: "I won't show"
qz_: "I won't show either"
- name: Show all variables
ansible.builtin.debug: msg="{{ lookup('ansible.builtin.varnames', '.+')}}"
- name: Show variables with 'hosts' in their names
ansible.builtin.debug: msg="{{ lookup('ansible.builtin.varnames', 'hosts')}}"
- name: Find several related variables that end specific way
ansible.builtin.debug: msg="{{ lookup('ansible.builtin.varnames', '.+_zone$', '.+_location$') }}"
"""
RETURN = """
_value:
description:
- List of the variable names requested.
type: list
"""
import re
from ansible.errors import AnsibleError
from ansible.module_utils._text import to_native
from ansible.module_utils.six import string_types
from ansible.plugins.lookup import LookupBase
class LookupModule(LookupBase):
def run(self, terms, variables=None, **kwargs):
if variables is None:
raise AnsibleError('No variables available to search')
self.set_options(var_options=variables, direct=kwargs)
ret = []
variable_names = list(variables.keys())
for term in terms:
if not isinstance(term, string_types):
raise AnsibleError('Invalid setting identifier, "%s" is not a string, it is a %s' % (term, type(term)))
try:
name = re.compile(term)
except Exception as e:
raise AnsibleError('Unable to use "%s" as a search parameter: %s' % (term, to_native(e)))
for varname in variable_names:
if name.search(varname):
ret.append(varname)
return ret
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