Add support for python3.12

setup.py

@@ -37,8 +37,16 @@ setup(
     classifiers=[
       'Development Status :: 4 - Beta',
       'License :: OSI Approved :: GNU General Public License (GPL)',
-      'Programming Language :: Python :: 2',
+      'Programming Language :: Python :: 2.7',
+      'Programming Language :: Python :: 3',
+      'Programming Language :: Python :: 3.7',
+      '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',
       ],
+    python_requires=">=2.7",
     entry_points={
       'console_scripts': [
         'generate-signature-key = slapos.signature:run',

slapos/libnetworkcache.py

@@ -28,14 +28,15 @@ import tempfile
 import traceback
 from base64 import b64encode, b64decode
 try:
-  import configparser
+  from configparser import ConfigParser
   from http.client import HTTPConnection, HTTPSConnection
   from urllib.error import HTTPError
   from urllib.parse import urlsplit
   from urllib.request import urlopen
   basestring = bytes, str
 except ImportError:
-  import ConfigParser as configparser
+  from ConfigParser import SafeConfigParser as ConfigParser
+  ConfigParser.read_file = ConfigParser.readfp
   from httplib import HTTPConnection, HTTPSConnection
   from urllib2 import HTTPError, urlopen
   from urlparse import urlsplit
@@ -197,8 +198,8 @@ class NetworkcacheClient(object):
 
   def __new_init(self, config, signature_certificate_list=None):
     if not hasattr(config, 'get'):
-      parser = configparser.SafeConfigParser()
-      parser.readfp(config)
+      parser = ConfigParser()
+      parser.read_file(config)
       config = dict(parser.items('networkcache'))
     self.config = config
     path = config.get('signature-private-key-file')

slapos/signature.py

@@ -16,10 +16,6 @@ import argparse
 import os
 import subprocess
 import sys
-try:
-  import configparser
-except ImportError:
-  import ConfigParser as configparser
 
 def generateCertificate(certificate_file, key_file, common_name):
   if os.path.lexists(certificate_file):