Added `--version` CLI option to show the version of Flamenco Worker

CHANGELOG.md

@@ -14,6 +14,7 @@ changed functionality, fixed bugs).
   This is only supported on POSIX platforms that have those signals.
 - Worker can be told to shut down by the Manager. The environment (for example systemd
   on Linux) is responsible for restarting Flamenco Worker after such a shutdown.
+- Added `--version` CLI option to show the version of Flamenco Worker and quit.
 
 
 ## Version 2.0.8 (released 2017-09-07)

flamenco_worker/cli.py

@@ -17,6 +17,8 @@ def main():
     parser.add_argument('-v', '--verbose', action='store_true',
                         help='Show configuration before starting, '
                              'and asyncio task status at shutdown.')
+    parser.add_argument('-V', '--version', action='store_true',
+                        help='Show the version of Flamenco Worker and stops.')
     parser.add_argument('-r', '--reregister', action='store_true',
                         help="Erases authentication information and re-registers this worker "
                              "at the Manager. WARNING: this can cause duplicate worker information "
@@ -27,6 +29,11 @@ def main():
                              "for more powerful options.")
     args = parser.parse_args()
 
+    if args.version:
+        from . import __version__
+        print(__version__)
+        raise SystemExit()
+
     # Load configuration
     from . import config
     confparser = config.load_config(args.config, args.verbose)