Remove deprecated settings from already existing config files

Signed-off-by: Hemanth Kumar Veeranki <hems.india1997@gmail.com>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

actions/ejabberd

@@ -28,6 +28,7 @@ import stat
 import subprocess
 import sys
 import ruamel.yaml
+from distutils.version import LooseVersion as LV
 
 from plinth import action_utils
 from plinth.modules import config
@@ -38,6 +39,8 @@ EJABBERD_CONFIG = '/etc/ejabberd/ejabberd.yml'
 EJABBERD_BACKUP = '/var/log/ejabberd/ejabberd.dump'
 EJABBERD_BACKUP_NEW = '/var/log/ejabberd/ejabberd_new.dump'
 EJABBERD_ORIG_CERT = '/etc/ejabberd/ejabberd.pem'
+IQDISC_DEPRECATED_VERSION = LV('18.03')
+MOD_IRC_DEPRECATED_VERSION = LV('18.06')
 
 
 def parse_arguments():
@@ -94,6 +97,8 @@ def parse_arguments():
     letsencrypt.add_argument('command', choices=('add', 'drop'), help=help_LE)
     letsencrypt.add_argument('--domain', help='Domain name to drop.')
 
+    subparsers.add_parser('fix-config', help='Fix the deprecated config files')
+
     subparsers.required = True
     return parser.parse_args()
 
@@ -355,6 +360,39 @@ def subcommand_letsencrypt(arguments):
         action_utils.service_restart('ejabberd')
 
 
+def subcommand_fix_config(_):
+    """ Fix the config file by removing deprecated settings"""
+    current_version = _get_version()
+    if not current_version:
+        print('Unable to get the version. Check if ejabberd is installed')
+        return
+
+    with open(EJABBERD_CONFIG, 'r') as file_handle:
+        conf = ruamel.yaml.round_trip_load(file_handle, preserve_quotes=True)
+
+    # Check if `iqdisc` is present and remove it
+    if 'mod_mam' in conf['modules'] and current_version > IQDISC_DEPRECATED_VERSION:
+        conf['modules']['mod_mam'].pop('iqdisc', None)
+
+    # check if mod_irc is present in modules and remove it
+    if 'mod_irc' in conf['modules'] and current_version > MOD_IRC_DEPRECATED_VERSION:
+        conf['modules'].pop('mod_irc')
+
+    # Write changes back to the file
+    with open(EJABBERD_CONFIG, 'w') as file_handle:
+        ruamel.yaml.round_trip_dump(conf, file_handle)
+
+
+def _get_version():
+    """ Get the current ejabberd version """
+    output = subprocess.check_output(['ejabberdctl', 'status']).decode('utf-8')
+    version_info = output.strip().split('\n')[-1].split()
+    if version_info:
+        version = str(version_info[1])
+        return LV(version)
+    return None
+
+
 def main():
     """Parse arguments and perform all duties"""
     arguments = parse_arguments()

plinth/modules/ejabberd/__init__.py

@@ -33,7 +33,7 @@ from plinth.utils import format_lazy
 
 from .manifest import backup, clients
 
-version = 1
+version = 2
 
 managed_services = ['ejabberd']
 
@@ -97,6 +97,7 @@ def setup(helper, old_version=None):
                 ['pre-install', '--domainname', domainname])
     helper.install(managed_packages)
     helper.call('post', actions.superuser_run, 'ejabberd', ['setup'])
+    actions.superuser_run('ejabberd', ['fix-config'])
     global service
     if service is None:
         service = service_module.Service(