logging for bureau exception traces

screenless/bureau/bureau.py

@@ -5,6 +5,7 @@ import json
 import logging
 import os.path
 import subprocess
+import sys
 import tempfile
 import textwrap
 import threading
@@ -115,6 +116,7 @@ class Bureau(object):
         log_format = logging.Formatter('LOG ${levelname} $name: $message', style='$')
         log_printer.setFormatter(log_format)
         self.log.addHandler(log_printer)
+        sys.excepthook = self._log_exception
 
         # setup a dir to store files and data
         self.datadir = os.path.join(basepath, self.prefix)
@@ -133,6 +135,10 @@ class Bureau(object):
         self.log.debug("commands: ")
         self.log.debug(str(self.commands))
 
+    def _log_exception(typ, value, tb):
+        self.log.error("CRASH TRACE: {0}".format(str(value)), exc_info=(typ, value, tb))
+        sys.__excepthook__(typ, value, tb)
+
     def load_config(self):
         """
         load (or reload) config data from file