Remove Python 3.8 support

Python 3.8 is no longer part of tested runtimes since 2024.2 . Removing
support for Python 3.8 allows us to replace deprecated md5 wrapper from
oslo.utils [1] by direct call of hashlib.md5.

[1] https://review.opendev.org/c/openstack/oslo.utils/+/930879

Also add python 3.12 to classifiers because now py312 unit test job is
voting.

Change-Id: I53da305538e27f2ff20a1ecb25960ebb03388011

nova/crypto.py

@@ -21,6 +21,7 @@ Includes root and intermediate CAs, SSH key_pairs and x509 certificates.
 
 import base64
 import binascii
+import hashlib
 import io
 import os
 import typing as ty
@@ -36,7 +37,6 @@ from cryptography import x509
 from oslo_concurrency import processutils
 from oslo_log import log as logging
 from oslo_serialization import base64 as oslo_base64
-from oslo_utils.secretutils import md5
 import paramiko
 
 import nova.conf
@@ -75,7 +75,7 @@ def generate_fingerprint(public_key: str) -> str:
         serialization.load_ssh_public_key(
             pub_bytes, backends.default_backend())
         pub_data = base64.b64decode(public_key.split(' ')[1])
-        raw_fp = md5(pub_data, usedforsecurity=False).hexdigest()
+        raw_fp = hashlib.md5(pub_data, usedforsecurity=False).hexdigest()
         return ':'.join(a + b for a, b in zip(raw_fp[::2], raw_fp[1::2]))
     except Exception:
         raise exception.InvalidKeypair(

nova/privsep/fs.py

@@ -17,9 +17,10 @@
 Helpers for filesystem related routines.
 """
 
+import hashlib
+
 from oslo_concurrency import processutils
 from oslo_log import log as logging
-from oslo_utils.secretutils import md5
 
 import nova.privsep
 
@@ -283,7 +284,7 @@ def _get_hash_str(base_str):
     """
     if isinstance(base_str, str):
         base_str = base_str.encode('utf-8')
-    return md5(base_str, usedforsecurity=False).hexdigest()
+    return hashlib.md5(base_str, usedforsecurity=False).hexdigest()
 
 
 def get_file_extension_for_os_type(os_type, default_ephemeral_format,

nova/tests/unit/test_utils.py

@@ -13,6 +13,7 @@
 #    under the License.
 
 import datetime
+import hashlib
 import os
 import os.path
 import tempfile
@@ -29,7 +30,6 @@ from oslo_context import context as common_context
 from oslo_context import fixture as context_fixture
 from oslo_utils import encodeutils
 from oslo_utils import fixture as utils_fixture
-from oslo_utils.secretutils import md5
 
 from nova import context
 from nova import exception
@@ -203,7 +203,7 @@ class GenericUtilsTestCase(test.NoDBTestCase):
     def test_get_hash_str(self):
         base_str = b"foo"
         base_unicode = u"foo"
-        value = md5(base_str, usedforsecurity=False).hexdigest()
+        value = hashlib.md5(base_str, usedforsecurity=False).hexdigest()
         self.assertEqual(
             value, utils.get_hash_str(base_str))
         self.assertEqual(

nova/utils.py

@@ -44,7 +44,6 @@ import oslo_messaging as messaging
 from oslo_utils import encodeutils
 from oslo_utils import excutils
 from oslo_utils import importutils
-from oslo_utils.secretutils import md5
 from oslo_utils import strutils
 from oslo_utils import timeutils
 
@@ -791,7 +790,7 @@ def get_hash_str(base_str):
     """
     if isinstance(base_str, str):
         base_str = base_str.encode('utf-8')
-    return md5(base_str, usedforsecurity=False).hexdigest()
+    return hashlib.md5(base_str, usedforsecurity=False).hexdigest()
 
 
 def get_sha256_str(base_str):

releasenotes/notes/remove-py38-5c619aee267bc1f3.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Support for Python 3.8 has been removed. Now the minimum python version
+    supported is 3.9 .

setup.cfg

@@ -10,7 +10,7 @@ project_urls =
     Bug Tracker = https://bugs.launchpad.net/nova/
     Documentation = https://docs.openstack.org/nova/
     Source Code = https://opendev.org/openstack/nova
-python_requires = >=3.8
+python_requires = >=3.9
 classifiers =
     Development Status :: 5 - Production/Stable
     Environment :: OpenStack
@@ -20,10 +20,10 @@ classifiers =
     Operating System :: POSIX :: Linux
     Programming Language :: Python
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
+    Programming Language :: Python :: 3.12
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: Implementation :: CPython