Cherry pick 5ac303df8a to address the 2to3 issue. Thanks to Paul Wise for digging (Closes: #997601)

debian/changelog

@@ -1,3 +1,12 @@
+fail2ban (0.11.2-4) unstable; urgency=medium
+
+  * Cherry pick 5ac303df8a171f748330d4c645ccbf1c2c7f3497
+    to address the 2to3 issue.
+    Thanks to Paul Wise for digging
+    (Closes: #997601)
+
+ -- Sylvestre Ledru <sylvestre@debian.org>  Tue, 11 Jan 2022 09:12:57 +0100
+
 fail2ban (0.11.2-3) unstable; urgency=medium
 
   [ Debian Janitor ]

debian/patches/997601-use_2to3.diff

@@ -0,0 +1,64 @@
+From 5ac303df8a171f748330d4c645ccbf1c2c7f3497 Mon Sep 17 00:00:00 2001
+From: sebres <info@sebres.de>
+Date: Sun, 19 Sep 2021 18:49:18 +0200
+Subject: [PATCH] fix gh-3098: build fails with error in fail2ban setup
+ command: use_2to3 is invalid (setuptools 58+)
+
+---
+ setup.py | 16 +---------------
+ 1 file changed, 1 insertion(+), 15 deletions(-)
+
+diff --git a/setup.py b/setup.py
+index f4c2550f6..98413273c 100755
+--- a/setup.py
++++ b/setup.py
+@@ -48,7 +48,7 @@
+ from glob import glob
+ 
+ from fail2ban.setup import updatePyExec
+-
++from fail2ban.version import version
+ 
+ source_dir = os.path.realpath(os.path.dirname(
+ 	# __file__ seems to be overwritten sometimes on some python versions (e.g. bug of 2.6 by running under cProfile, etc.):
+@@ -112,22 +112,12 @@ def update_scripts(self, dry_run=False):
+ # Wrapper to specify fail2ban own options:
+ class install_command_f2b(install):
+ 	user_options = install.user_options + [
+-		('disable-2to3', None, 'Specify to deactivate 2to3, e.g. if the install runs from fail2ban test-cases.'),
+ 		('without-tests', None, 'without tests files installation'),
+ 	]
+ 	def initialize_options(self):
+-		self.disable_2to3 = None
+ 		self.without_tests = not with_tests
+ 		install.initialize_options(self)
+ 	def finalize_options(self):
+-		global _2to3
+-		## in the test cases 2to3 should be already done (fail2ban-2to3):
+-		if self.disable_2to3:
+-			_2to3 = False
+-		if _2to3:
+-			cmdclass = self.distribution.cmdclass
+-			cmdclass['build_py'] = build_py_2to3
+-			cmdclass['build_scripts'] = build_scripts_2to3
+ 		if self.without_tests:
+ 			self.distribution.scripts.remove('bin/fail2ban-testcases')
+ 
+@@ -178,7 +168,6 @@ def run(self):
+ if setuptools:
+ 	setup_extra = {
+ 		'test_suite': "fail2ban.tests.utils.gatherTests",
+-		'use_2to3': True,
+ 	}
+ else:
+ 	setup_extra = {}
+@@ -202,9 +191,6 @@ def run(self):
+ 		('/usr/share/doc/fail2ban', doc_files)
+ 	)
+ 
+-# Get version number, avoiding importing fail2ban.
+-# This is due to tests not functioning for python3 as 2to3 takes place later
+-exec(open(join("fail2ban", "version.py")).read())
+ 
+ setup(
+ 	name = "fail2ban",

debian/patches/series

@@ -10,3 +10,4 @@ fix-mail.patch
 debian_roundcube.diff
 systemd-run.diff
 scanlogd.patch
+997601-use_2to3.diff