allows to update some configuration options (read with config-readers) with command line option, e. g.:

```bash
## start server with DEBUG log-level (ignore level read from fail2ban.conf):
fail2ban-client --loglevel DEBUG start
## or
fail2ban-server -c /cfg/path --loglevel DEBUG start
## keep server log-level by reload (without restart it)
fail2ban-client --loglevel DEBUG reload
## switch log-level back to INFO:
fail2ban-client set loglevel INFO
```

fail2ban/client/configurator.py

@@ -72,8 +72,8 @@ class Configurator:
 	def getEarlyOptions(self):
 		return self.__fail2ban.getEarlyOptions()
 
-	def getOptions(self, jail = None):
-		self.__fail2ban.getOptions()
+	def getOptions(self, jail=None, updateMainOpt=None):
+		self.__fail2ban.getOptions(updateMainOpt)
 		return self.__jails.getOptions(jail)
 		
 	def convertToProtocol(self):

fail2ban/client/fail2bancmdline.py

@@ -242,7 +242,7 @@ class Fail2banCmdLine():
 		try:
 			self.configurator.Reload()
 			self.configurator.readAll()
-			ret = self.configurator.getOptions(jail)
+			ret = self.configurator.getOptions(jail, self._conf)
 			self.configurator.convertToProtocol()
 			stream = self.configurator.getConfigStream()
 		except Exception as e:

fail2ban/client/fail2banreader.py

@@ -49,13 +49,15 @@ class Fail2banReader(ConfigReader):
 		]
 		return ConfigReader.getOptions(self, "Definition", opts)
 	
-	def getOptions(self):
+	def getOptions(self, updateMainOpt=None):
 		opts = [["string", "loglevel", "INFO" ],
 				["string", "logtarget", "STDERR"],
 				["string", "syslogsocket", "auto"],
 				["string", "dbfile", "/var/lib/fail2ban/fail2ban.sqlite3"],
 				["string", "dbpurgeage", "1d"]]
 		self.__opts = ConfigReader.getOptions(self, "Definition", opts)
+		if updateMainOpt:
+			self.__opts.update(updateMainOpt)
 	
 	def convert(self):
 		# Ensure logtarget/level set first so any db errors are captured