add support for syslog on freebsd

rotator/__main__.py

@@ -1,7 +1,9 @@
 import argparse
 import logging
 import logging.handlers
+import os
 import re
+import stat
 import sys
 
 import rotator
@@ -83,11 +85,23 @@ def main():
     handler.setLevel(logging.WARNING)
     log.addHandler(handler)
 
-    handler = logging.handlers.SysLogHandler(address='/dev/log')
+    handler = None
+    for logsocket in ('/var/run/log', '/dev/log'):
+        try:
+            mode = os.stat(logsocket).st_mode
+        except FileNotFoundError:
+            continue
+
+        if stat.S_ISSOCK(mode):
+            handler = logging.handlers.SysLogHandler(address=logsocket)
             formatter = logging.Formatter(fmt='rotator[%(process)s] %(message)s')
             handler.setFormatter(formatter)
             handler.setLevel(logging.INFO)
             log.addHandler(handler)
+            break
+
+    if not handler:
+        log.warning('No syslog socket found, will not log to syslog')
 
     args = parse_args()