In current implementation it's not telling too much about the failure itself:

Error Message

Error: repoclosure failed. exit code is: 256
Stacktrace

Traceback (most recent call last):
File "/usr/lib64/python2.7/unittest/case.py", line 369, in run
testMethod()
File "/usr/lib/python2.7/site-packages/nose/case.py", line 197, in runTest
self.test(*self.arg)
File "/usr/lib/python2.7/site-packages/ovirtlago/testlib.py", line 129, in wrapped_test
test()
File "/home/jenkins/workspace/test-repo_ovirt_experimental_master/ovirt-system-tests/basic-suite-master/test-scenarios/000_check_repo_closure.py", line 95, in check_repo_closure
res, 0, 'Error: repoclosure failed. exit code is: {}'.format(res)
File "/usr/lib/python2.7/site-packages/nose/tools/trivial.py", line 29, in eq_
raise AssertionError(msg or "%r != %r" % (a, b))
AssertionError: Error: repoclosure failed. exit code is: 256