Cherry-pick upstream fix to fix a startup issue with Python 3.10 (LP: #1958505)

debian/changelog

@@ -1,3 +1,10 @@
+fail2ban (0.11.2-6) unstable; urgency=medium
+
+  * Cherry-pick upstream fix to fix a startup issue with Python 3.10
+    (LP: #1958505)
+
+ -- Sylvestre Ledru <sylvestre@debian.org>  Thu, 10 Mar 2022 22:52:59 +0100
+
 fail2ban (0.11.2-5) unstable; urgency=medium
 
   * Revert the CVE-2021-32749 fix (Closes: #991449)

debian/patches/python3.10.diff

@@ -0,0 +1,61 @@
+diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
+index 7a1d31df3d..262448c2da 100644
+--- a/.github/workflows/main.yml
++++ b/.github/workflows/main.yml
+@@ -22,7 +22,7 @@ jobs:
+     runs-on: ubuntu-20.04
+     strategy:
+       matrix:
+-        python-version: [2.7, 3.5, 3.6, 3.7, 3.8, 3.9, pypy2, pypy3]
++        python-version: [2.7, 3.5, 3.6, 3.7, 3.8, 3.9, '3.10.0-alpha.5', pypy2, pypy3]
+       fail-fast: false
+     # Steps represent a sequence of tasks that will be executed as part of the job
+     steps:
+diff --git a/fail2ban/server/action.py b/fail2ban/server/action.py
+index 3bc48fe046..f0f1e6f59a 100644
+--- a/fail2ban/server/action.py
++++ b/fail2ban/server/action.py
+@@ -30,7 +30,10 @@
+ import threading
+ import time
+ from abc import ABCMeta
+-from collections import MutableMapping
++try:
++	from collections.abc import MutableMapping
++except ImportError:
++	from collections import MutableMapping
+ 
+ from .failregex import mapTag2Opt
+ from .ipdns import DNSUtils
+diff --git a/fail2ban/server/actions.py b/fail2ban/server/actions.py
+index b7b95b445a..897d907c1a 100644
+--- a/fail2ban/server/actions.py
++++ b/fail2ban/server/actions.py
+@@ -28,7 +28,10 @@
+ import os
+ import sys
+ import time
+-from collections import Mapping
++try:
++	from collections.abc import Mapping
++except ImportError:
++	from collections import Mapping
+ try:
+ 	from collections import OrderedDict
+ except ImportError:
+diff --git a/fail2ban/server/jails.py b/fail2ban/server/jails.py
+index 972a8c4bd2..27e12ddf65 100644
+--- a/fail2ban/server/jails.py
++++ b/fail2ban/server/jails.py
+@@ -22,7 +22,10 @@
+ __license__ = "GPL"
+ 
+ from threading import Lock
+-from collections import Mapping
++try:
++	from collections.abc import Mapping
++except ImportError:
++	from collections import Mapping
+ 
+ from ..exceptions import DuplicateJailException, UnknownJailException
+ from .jail import Jail

debian/patches/series

@@ -10,3 +10,4 @@ debian_roundcube.diff
 systemd-run.diff
 scanlogd.patch
 997601-use_2to3.diff
+python3.10.diff