Installation fails on Red Hat Server - unassigned variable

[jstraub-hw]

The installation of the R-Service fails on an HDP 2.2.4 and Ambari 2.0 release.

The script r-service/package/scripts/ambari/ambari_helpers.py threws an exception because the variable repo_dir is used before any value is assigned. The following code partial produces the error:

distribution = platform.linux_distribution()[0].lower()
#TODO: add ubuntu
if distribution in ['centos', 'redhat'] :
    repo_dir = package_dir()+'files/repos/rhel6/'
    os_repo_dir = '/etc/yum.repos.d/'

  for repo in os.listdir(repo_dir):
    if not os.path.isfile(os_repo_dir + repo):
      Execute('cp ' + repo_dir+repo + ' ' + os_repo_dir)

When I try platform.linux_distribution()[0].lower() on my cluster I receive the following value:

Python 2.6.6 (r266:84292, Jan 22 2014, 01:49:05)
>>> import platform
>>> platform.linux_distribution()[0].lower()
'red hat enterprise linux server'
>>>

[oluies]

Same on ubuntu 14.04

Traceback (most recent call last):
  File "/var/lib/ambari-agent/cache/stacks/HDP/2.3/services/r-service/package/scripts/ambari/client.py", line 20, in <module>
    Client().execute()
  File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py", line 219, in execute
    method(env)
  File "/var/lib/ambari-agent/cache/stacks/HDP/2.3/services/r-service/package/scripts/ambari/client.py", line 7, in install
    helpers.add_repos()
  File "/var/lib/ambari-agent/cache/stacks/HDP/2.3/services/r-service/package/scripts/ambari/ambari_helpers.py", line 13, in add_repos
    for repo in os.listdir(repo_dir):
UnboundLocalError: local variable 'repo_dir' referenced before assignment

>>> import platform
>>> platform.linux_distribution()[0].lower()
'debian'
>>>