Logging fix and --syslog option.

Logging did not work when running as a daemon
because all open file handles were closed for
the fork. Since we cannot get to the file handle
using the 'logging' module, we'll just have to
re-init the logging after the daemon starts.

Added a --syslog option so that we can choose to
use syslog for capturing our logs. If present, it
takes precedence over any log file specified. The
timestamps are removed from the log message when
using syslog (it is assumed syslog will add the time).

libra/common/options.py

@@ -13,7 +13,9 @@
 
 import argparse
 import logging
+import logging.handlers
 import os.path
+import sys
 import ConfigParser
 
 
@@ -132,6 +134,10 @@ class Options(object):
             ),
             help='log file to use (ignored with --nodaemon)'
         )
+        self.parser.add_argument(
+            '--syslog', dest='syslog', action='store_true',
+            help='use syslog for logging output'
+        )
         self.parser.add_argument(
             '--user', dest='user',
             help='user to use for daemon mode'
@@ -160,12 +166,28 @@ def setup_logging(name, args):
     if args.nodaemon:
         logfile = None
 
-    logging.basicConfig(
-        format='%(asctime)-6s: %(name)s - %(levelname)s - %(message)s',
-        filename=logfile
+    # Timestamped formatter
+    ts_formatter = logging.Formatter(
+        '%(asctime)-6s: %(name)s - %(levelname)s - %(message)s'
     )
 
+    # No timestamp, used with syslog
+    simple_formatter = logging.Formatter(
+        '%(name)s - %(levelname)s - %(message)s'
+    )
+
+    if args.syslog:
+        handler = logging.handlers.SysLogHandler(facility="daemon")
+        handler.setFormatter(simple_formatter)
+    elif logfile:
+        handler = logging.FileHandler(logfile)
+        handler.setFormatter(ts_formatter)
+    else:
+        handler = logging.StreamHandler(sys.stdout)
+        handler.setFormatter(ts_formatter)
+
     logger = logging.getLogger(name)
+    logger.addHandler(handler)
 
     if args.debug:
         logger.setLevel(level=logging.DEBUG)