task: don't hide exceptions in Task

If the Task raised an exception we currently hide it
and replace it with RuntimeError.  This is bad.

If an exception occured, then we don't have a result so
re-raise the original exception.

Or we could log the traceback and raise RuntimeError, but
that doesn't seem to be a good idea.

Sample traceback after re-raising original.  Without this patch the ValueError is only written
to _write_error_data

2018-03-25 22:57:56,511 yardstick.benchmark.contexts.node node.py:85 DEBUG BareMetals: []
2018-03-25 22:57:56,511 yardstick.benchmark.contexts.node node.py:89 DEBUG Env: {}
2018-03-25 22:57:56,511 yardstick.cmd.commands.task task.py:57 INFO Task FAILED
Traceback (most recent call last):
  File "/home/rbbratta/yardstick-upstream/yardstick/yardstick/cmd/commands/task.py", line 54, in do_start
    result = Task().start(param, **kwargs)
  File "/home/rbbratta/yardstick-upstream/yardstick/yardstick/benchmark/core/task.py", line 103, in start
    task_args_fnames)
  File "/home/rbbratta/yardstick-upstream/yardstick/yardstick/benchmark/core/task.py", line 321, in _parse_tasks
    task_args_fnames[i]
  File "/home/rbbratta/yardstick-upstream/yardstick/yardstick/benchmark/core/task.py", line 558, in parse_task
    context.init(cfg_attrs)
  File "/home/rbbratta/yardstick-upstream/yardstick/yardstick/benchmark/contexts/heat.py", line 131, in init
    server = Server(name, self, server_attrs)
  File "/home/rbbratta/yardstick-upstream/yardstick/yardstick/benchmark/contexts/model.py", line 210, in __init__
    (name, p))
ValueError: server 'trafficgen_1', placement 'pgrp2' is invalid
2018-03-25 22:57:56,512 yardstick.cmd.commands.task task.py:62 INFO Task FAILED
2018-03-25 22:57:56,662 yardstick.benchmark.runners.base base.py:124 DEBUG Terminating all runners
NoneType

JIRA: YARDSTICK-1102

Change-Id: I7e6fa41fc1d36f6d438a1602ab60cb41ffbee1e9
Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>

1 files changed, 9 insertions, 6 deletions

diff --git a/yardstick/cmd/commands/task.py b/yardstick/cmd/commands/task.py
index a3488a23d..c6379e586 100644
--- a/yardstick/cmd/commands/task.py
+++ b/yardstick/cmd/commands/task.py
@@ -25,6 +25,7 @@ class TaskCommands(object):     # pragma: no cover
 
        Set of commands to manage benchmark tasks.
        """
+    EXIT_TEST_FAILED = 2
 
     @cliargs("inputfile", type=str, help="path to task or suite file", nargs=1)
     @cliargs("--task-args", dest="task_args",
@@ -48,18 +49,20 @@ class TaskCommands(object):     # pragma: no cover
         param = change_osloobj_to_paras(args)
         self.output_file = param.output_file
 
-        result = {}
         LOG.info('Task START')
         try:
             result = Task().start(param, **kwargs)
         except Exception as e:  # pylint: disable=broad-except
             self._write_error_data(e)
-
-        if result.get('result', {}).get('criteria') == 'PASS':
-            LOG.info('Task SUCCESS')
-        else:
             LOG.info('Task FAILED')
-            raise RuntimeError('Task Failed')
+            raise
+        else:
+            if result.get('result', {}).get('criteria') == 'PASS':
+                LOG.info('Task SUCCESS')
+            else:
+                LOG.info('Task FAILED')
+                # exit without backtrace
+                raise SystemExit(self.EXIT_TEST_FAILED)
 
     def _write_error_data(self, error):
         data = {'status': 2, 'result': str(error)}