Provide own getargspec for roles and modules with Python 3.11

Python 3.11 dropped compat inspect.getargspec. As the roles and modules
need to support Python2 and Python3, the code for getargspec has been
copied from Python 3.10 and is added as a fallback as soon as getargspec
can not be imported from inspect. The copied getargspec is using
getfullargspec internally.

Fixes: #855 (Python's inspect.getargspec was removed in version 3.11)

roles/ipaserver/library/ipaserver_setup_ntp.py

@@ -53,12 +53,11 @@ EXAMPLES = '''
 RETURN = '''
 '''
 
-import inspect
-
 from ansible.module_utils.basic import AnsibleModule
 from ansible.module_utils.ansible_ipa_server import (
     AnsibleModuleLog, setup_logging, options, sysrestore, paths,
-    redirect_stdout, time_service, sync_time, ntpinstance, timeconf
+    redirect_stdout, time_service, sync_time, ntpinstance, timeconf,
+    getargspec
 )
 
 
@@ -94,7 +93,7 @@ def main():
         ansible_module.log("Synchronizing time")
 
         # pylint: disable=deprecated-method
-        argspec = inspect.getargspec(sync_time)
+        argspec = getargspec(sync_time)
         # pylint: enable=deprecated-method
         if "options" not in argspec.args:
             synced_ntp = sync_time(options.ntp_servers, options.ntp_pool,

roles/ipaserver/library/ipaserver_test.py

@@ -212,7 +212,6 @@ RETURN = '''
 
 import os
 import sys
-import inspect
 import random
 from shutil import copyfile
 
@@ -226,7 +225,7 @@ from ansible.module_utils.ansible_ipa_server import (
     read_cache, ca, tasks, check_ldap_conf, timeconf, httpinstance,
     check_dirsrv, ScriptError, get_fqdn, verify_fqdn, BadHostError,
     validate_domain_name, load_pkcs12, IPA_PYTHON_VERSION,
-    encode_certificate, check_available_memory
+    encode_certificate, check_available_memory, getargspec
 )
 from ansible.module_utils import six
 
@@ -944,7 +943,7 @@ def main():
         realm_name = options.realm_name.upper()
 
     # pylint: disable=deprecated-method
-    argspec = inspect.getargspec(validate_domain_name)
+    argspec = getargspec(validate_domain_name)
     # pylint: enable=deprecated-method
     if "entity" in argspec.args:
         # NUM_VERSION >= 40690:

roles/ipaserver/module_utils/ansible_ipa_server.py

@@ -41,7 +41,7 @@ __all__ = ["IPAChangeConf", "certmonger", "sysrestore", "root_logger",
            "adtrustinstance", "IPAAPI_USER", "sync_time", "PKIIniLoader",
            "default_subject_base", "default_ca_subject_dn",
            "check_ldap_conf", "encode_certificate", "decode_certificate",
-           "check_available_memory"]
+           "check_available_memory", "getargspec"]
 
 import sys
 
@@ -58,6 +58,28 @@ else:
     from ansible.module_utils import six
     import base64
 
+    # Import getargspec from inspect or provide own getargspec for
+    # Python 2 compatibility with Python 3.11+.
+    try:
+        from inspect import getargspec
+    except ImportError:
+        from collections import namedtuple
+        from inspect import getfullargspec
+
+        # The code is copied from Python 3.10 inspect.py
+        # Authors: Ka-Ping Yee <ping@lfw.org>
+        #          Yury Selivanov <yselivanov@sprymix.com>
+        ArgSpec = namedtuple('ArgSpec', 'args varargs keywords defaults')
+
+        def getargspec(func):
+            args, varargs, varkw, defaults, kwonlyargs, _kwonlydefaults, \
+                ann = getfullargspec(func)
+            if kwonlyargs or ann:
+                raise ValueError(
+                    "Function has keyword-only parameters or annotations"
+                    ", use inspect.signature() API which can support them")
+            return ArgSpec(args, varargs, varkw, defaults)
+
     from ipapython.version import NUM_VERSION, VERSION
 
     if NUM_VERSION < 30201: