ipabackup: Use module to get IPA_BACKUP_DIR from ipaplatform

Up to now a python snippet was used to get IPA_BACKUP_DIR from ipaplatform
but this was not working when ansible_facts was false due to not getting
ansible_python_interpreter set.

The module version is also working if gather_facts is turned off.

roles/ipabackup/library/ipabackup_get_backup_dir.py

+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# Authors:
+#   Thomas Woerner <twoerner@redhat.com>
+#
+# Copyright (C) 2021  Red Hat
+# see file 'COPYING' for use and warranty information
+#
+# This program 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.
+#
+# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+ANSIBLE_METADATA = {
+    'metadata_version': '1.0',
+    'supported_by': 'community',
+    'status': ['preview'],
+}
+
+DOCUMENTATION = '''
+---
+module: ipabackup_get_backup_dir
+short description:
+  Get IPA_BACKUP_DIR from ipaplatform
+description:
+  Get IPA_BACKUP_DIR from ipaplatform
+options:
+author:
+    - Thomas Woerner
+'''
+
+EXAMPLES = '''
+# Get IPA_BACKUP_DIR from ipaplatform
+- name: ipabackup_get_backup_dir:
+  register result
+'''
+
+RETURN = '''
+backup_dir:
+  description: IPA_BACKUP_DIR from ipaplatform
+  returned: always
+  type: str
+'''
+
+from ansible.module_utils.basic import AnsibleModule
+from ipaplatform.paths import paths
+
+
+def main():
+    module = AnsibleModule(
+        argument_spec=dict(),
+        supports_check_mode=True,
+    )
+
+    module.exit_json(changed=False,
+                     backup_dir=paths.IPA_BACKUP_DIR)
+
+
+if __name__ == '__main__':
+    main()

roles/ipabackup/tasks/get_ipabackup_dir.yml

 ---
-- name: Get IPA_BACKUP_DIR dir from ipaplatform
-  command: "{{ ansible_python_interpreter | default('/usr/bin/python') }}"
-  args:
-    stdin: |
-      from ipaplatform.paths import paths
-      print(paths.IPA_BACKUP_DIR)
-  register: result_ipaplatform_backup_dir
+- name: Get IPA_BACKUP_DIR from ipaplatform
+  ipabackup_get_backup_dir:
+  register: result_ipabackup_get_backup_dir
 
 - name: Set IPA backup dir
   set_fact:
-    ipabackup_dir: "{{ result_ipaplatform_backup_dir.stdout_lines | first }}"
+    ipabackup_dir: "{{ result_ipabackup_get_backup_dir.backup_dir }}"