gconftool2_info: new module (#4743) (#4773)

* gconftool2_info: new module

* fixed imports

* fixed docs for gconftool2_info

* fixed docs for gconftool2_info

* minor adjustment in docs

* added tests

* adjustments

(cherry picked from commit 49836bb484)

Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>

plugins/modules/system/gconftool2_info.py

@@ -0,0 +1,74 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+# (c) 2022, Alexei Znamensky <russoz@gmail.com>
+# 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 = '''
+module: gconftool2_info
+author:
+    - "Alexei Znamensky (@russoz)"
+short_description: Retrieve GConf configurations
+version_added: 5.1.0
+description:
+  - This module allows retrieving application preferences from the GConf database, with the help of C(gconftool-2).
+options:
+  key:
+    description:
+    - The key name for an element in the GConf database.
+    type: str
+    required: true
+notes:
+  - See man gconftool-2(1) for more details.
+seealso:
+  - name: gconf repository (archived)
+    description: Git repository for the project. It is an archived project, so the repository is read-only.
+    link: https://gitlab.gnome.org/Archive/gconf
+'''
+
+EXAMPLES = """
+- name: Get value for a certain key in the database.
+  community.general.gconftool2_info:
+    key: /desktop/gnome/background/picture_filename
+  register: result
+"""
+
+RETURN = '''
+  value:
+    description:
+    - The value of the property.
+    returned: success
+    type: str
+    sample: Monospace 10
+'''
+
+from ansible_collections.community.general.plugins.module_utils.module_helper import ModuleHelper
+from ansible_collections.community.general.plugins.module_utils.gconftool2 import gconftool2_runner
+
+
+class GConftoolInfo(ModuleHelper):
+    output_params = ['key']
+    module = dict(
+        argument_spec=dict(
+            key=dict(type='str', required=True, no_log=False),
+        ),
+        supports_check_mode=True,
+    )
+
+    def __init_module__(self):
+        self.runner = gconftool2_runner(self.module, check_rc=True)
+
+    def __run__(self):
+        with self.runner.context(args_order=["get", "key"]) as ctx:
+            rc, out, err = ctx.run(get=True)
+            self.vars.value = None if err and not out else out.rstrip()
+
+
+def main():
+    GConftoolInfo.execute()
+
+
+if __name__ == '__main__':
+    main()