Description of problem:
Now we get the following backtrace if we try a retrace-server-worker --restart.  Something changed in the management of the retrace_log file in the latest retrace-server-1.14-2.el6.noarch

$ retrace-server-worker --restart 984648283
Traceback (most recent call last):
  File "/usr/bin/retrace-server-worker", line 28, in <module>
    worker.begin_logging()
  File "/usr/lib/python2.6/site-packages/retrace/retrace_worker.py", line 17, in begin_logging
    self.task._get_file_path(RetraceTask.LOG_FILE))
  File "/usr/lib64/python2.6/logging/__init__.py", line 827, in __init__
    StreamHandler.__init__(self, self._open())
  File "/usr/lib64/python2.6/logging/__init__.py", line 846, in _open
    stream = open(self.baseFilename, self.mode)
IOError: [Errno 13] Permission denied: '/retrace/tasks/984648283/retrace_log'
$ ls -l /retrace/tasks/984648283/retrace_log
-rw-r--r--. 1 retrace retrace-group 2860 Dec 15 16:09 /retrace/tasks/984648283/retrace_log


This is due to a bug which slipped in during the refactor of the RetraceWorker.  The log file is removed along with other task state files in task.reset().  However we don't even get that far since we bomb when we try to 'begin_logging' and the retrace_log is readonly and we try to open in append mode.

We need something like this patch which re-orders begin_logging after the task.reset().

diff -Nurp /usr/bin/retrace-server-worker /usr/bin/retrace-server-worker.movelogging 
--- /usr/bin/retrace-server-worker      2016-02-23 02:58:06.000000000 -0500
+++ /usr/bin/retrace-server-worker.movelogging  2016-03-04 14:19:14.894349632 -0500
@@ -25,16 +25,17 @@ if __name__ == "__main__":
         exit(1)
 
     worker = task.create_worker()
-    worker.begin_logging()
 
     if task.has_status():
         if not cmdline.restart:
-            log_error("%s has already been executed for task %d" % (sys.argv[0], cmdline.task_id))
-            log_info("You can use --restart option if you really want to restart the task")
+            sys.stderr.write("%s has already been executed for task %d\n" % (sys.argv[0], cmdline.task_id))
+            sys.stdout.write("You can use --restart option if you really want to restart the task\n")
             worker._fail()
 
         task.reset()
 
+    worker.begin_logging()
+
     if not cmdline.foreground:
         try:
             pid = os.fork()


Version-Release number of selected component (if applicable):
retrace-server-1.14-2.el6.noarch


How reproducible:
Everytime on any task


Steps to Reproduce:
1. retrace-server-worker --restart <taskid>


Actual results:
backtrace 

Expected results:
--restart works as before

Additional info: