Added `--debug` CLI parameter to enable debug logging

This makes it easier to enable debug logging, as it doesn't require editing
`flamenco-worker.cfg`.

CHANGELOG.md

@@ -6,6 +6,8 @@ changed functionality, fixed bugs).
 ## Version 2.0.8 (in development)
 
 - Fixed parsing of `--config` CLI param on Python 3.5
+- Added `--debug` CLI parameter to easily enable debug logging without having
+  to edit `flamenco-worker.cfg`.
 
 
 ## Version 2.0.7 (released 2017-07-04)

flamenco_worker/cli.py

@@ -20,12 +20,16 @@ def main():
                         help="Erases authentication information and re-registers this worker "
                              "at the Manager. WARNING: this can cause duplicate worker information "
                              "in the Manager's database.")
+    parser.add_argument('-d', '--debug', action='store_true',
+                        help="Enables debug logging for Flamenco Worker's own log entries. "
+                             "Edit the logging config in flamenco-worker.cfg "
+                             "for more powerful options.")
     args = parser.parse_args()
 
     # Load configuration
     from . import config
     confparser = config.load_config(args.config, args.verbose)
-    config.configure_logging(confparser)
+    config.configure_logging(confparser, enable_debug=args.debug)
 
     log = logging.getLogger(__name__)
     log.debug('Starting')

flamenco_worker/config.py

@@ -116,8 +116,12 @@ def load_config(config_file: pathlib.Path = None,
     return confparser
 
 
-def configure_logging(confparser: configparser.ConfigParser):
+def configure_logging(confparser: configparser.ConfigParser, enable_debug: bool):
     import logging.config
 
     logging.config.fileConfig(confparser, disable_existing_loggers=True)
     logging.captureWarnings(capture=True)
+
+    if enable_debug:
+        logging.getLogger('flamenco_worker').setLevel(logging.DEBUG)
+        log.debug('Enabling debug logging')