dig: Fix evaluation of boolean parameters (#5129)

* Add lookup_dig tests

* Fix boolean evaluation

* Add changelog fragment

* Apply review changes

* Add license

changelogs/fragments/5129-dig-boolean-params-fix.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - dig lookup plugin - fix evaluation of falsy values for boolean parameters ``fail_on_error`` and ``retry_servfail`` (https://github.com/ansible-collections/community.general/pull/5129).

plugins/lookup/dig.py

@@ -172,6 +172,7 @@
 from ansible.errors import AnsibleError
 from ansible.plugins.lookup import LookupBase
 from ansible.module_utils.common.text.converters import to_native
+from ansible.module_utils.parsing.convert_bool import boolean
 from ansible.utils.display import Display
 import socket
 
@@ -321,9 +322,9 @@ def run(self, terms, variables=None, **kwargs):
                     except Exception as e:
                         raise AnsibleError("dns lookup illegal CLASS: %s" % to_native(e))
                 elif opt == 'retry_servfail':
-                    myres.retry_servfail = bool(arg)
+                    myres.retry_servfail = boolean(arg)
                 elif opt == 'fail_on_error':
-                    fail_on_error = bool(arg)
+                    fail_on_error = boolean(arg)
 
                 continue
 

tests/integration/targets/lookup_dig/aliases

@@ -0,0 +1,6 @@
+# Copyright (c) Ansible Project
+# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+shippable/posix/group1
+skip/python2.6  # lookups are controller only, and we no longer support Python 2.6 on the controller

tests/integration/targets/lookup_dig/meta/main.yml

@@ -0,0 +1,7 @@
+---
+# Copyright (c) Ansible Project
+# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+dependencies:
+  - setup_remote_constraints

tests/integration/targets/lookup_dig/tasks/main.yml

@@ -0,0 +1,37 @@
+---
+####################################################################
+# WARNING: These are designed specifically for Ansible tests       #
+# and should not be used as examples of how to write Ansible roles #
+####################################################################
+
+# Copyright (c) Ansible Project
+# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+- name: Install dnspython library
+  pip:
+    name: dnspython
+    state: present
+    extra_args: "-c {{ remote_constraints }}"
+
+- name: Test dig lookup with existing domain
+  set_fact:
+    dig_existing: "{{ lookup('community.general.dig', 'github.com.') }}"
+
+- name: Test dig lookup with non-existing domain and fail_on_error=no
+  set_fact:
+    dig_nonexisting_fail_no: "{{ lookup('community.general.dig', 'non-existing.domain.', 'fail_on_error=no') }}"
+
+- name: Verify that NXDOMAIN was returned
+  assert:
+    that: dig_nonexisting_fail_no == 'NXDOMAIN'
+
+- name: Test dig lookup with non-existing domain and fail_on_error=yes
+  set_fact:
+    dig_nonexisting_fail_yes: "{{ lookup('community.general.dig', 'non-existing.domain.', 'fail_on_error=yes') }}"
+  ignore_errors: yes
+  register: dig_nonexisting_fail_yes_result
+
+- name: Verify that the task failed
+  assert:
+    that: dig_nonexisting_fail_yes_result is failed