feat: poc to retrieve via env and config prop

src/settings.liq

@@ -33,6 +33,13 @@ if not liquidsoap.version.at_least(liq_min_version) then
     exit(1)
 end
 
+# Retrieve a setting either bei 1.) environment variable or 2.) config prop.
+# If none is available the default value is returned.
+def get_setting(default_value, config_var, env_var) =
+    log_level_config = list.assoc(default=default_value, config_var, ini)
+    getenv(default=log_level_config, env_var)
+end
+
 # ALLOW LIQUIDSOAP RUN AS ROOT
 lqs_allow_root = list.assoc(default="false", "liquidsoap_as_root", ini)
 
@@ -50,10 +57,12 @@ settings.server.telnet.port.set(1234)
 # LOGGING SETTINGS
 settings.log.stdout.set(true)
 settings.log.file.set(true)
-log_level = int_of_string(list.assoc(default="3", "log_level", ini))
-settings.log.level.set(log_level)
+log_level = get_setting("3", "log_level", "AURA_ENGINE_CORE_LOG_LEVEL")
+settings.log.level.set(int_of_string(log_level))
 log_dir = list.assoc(default="../logs", "log_dir", ini)
-settings.log.file.path.set("#{log_dir}/engine-core.log")
+log_file = "#{log_dir}/engine-core.log"
+settings.log.file.path.set(log_file)
+print "\tLogging to '#{log_file}' with log level #{log_level}"
 
 # SOCKET SETTINGS
 settings.server.socket.set(true)