setup.py: fix get_wanted_formats() not to use global configuration file

When I tried to run unit tests it failed because of permission access:

$ ./check
run unit tests
Running test 650/650: test_updates_subdirectory_of_persistent_directory

OK
436 excluded statements
42 excluded modules
Time: 2.6 s
ERROR:root:Command failed: ./obnam list-formats
CRITICAL:root:Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/cliapp/app.py", line 182, in _run
    self.setup_logging()
  File "/usr/lib/python2.7/dist-packages/cliapp/app.py", line 408, in setup_logging
    delay=False)
  File "/usr/lib/python2.7/dist-packages/cliapp/app.py", line 58, in __init__
    *args, **kwargs)
  File "/usr/lib/python2.7/logging/handlers.py", line 118, in __init__
    BaseRotatingHandler.__init__(self, filename, mode, encoding, delay)
  File "/usr/lib/python2.7/logging/handlers.py", line 65, in __init__
    logging.FileHandler.__init__(self, filename, mode, encoding, delay)
  File "/usr/lib/python2.7/logging/__init__.py", line 897, in __init__
    StreamHandler.__init__(self, self._open())
  File "/usr/lib/python2.7/dist-packages/cliapp/app.py", line 65, in _open
    return logging.handlers.RotatingFileHandler._open(self)
  File "/usr/lib/python2.7/logging/__init__.py", line 916, in _open
    stream = open(self.baseFilename, self.mode)
IOError: [Errno 13] Permission denied: '/var/tmp/obnam.log'

This was because my global configuration had a log file configured and it was not accessible to a normal user:

$ grep '^log:' /etc/obnam.conf
log: /var/tmp/obnam.log
$ ls -l /var/tmp/obnam.log
-rw------- 1 root root 24112886 Oct 25 08:58 /var/tmp/obnam.log
$

1 files changed, 2 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 7d5768d1..b488ecf8 100755
--- a/setup.py
+++ b/setup.py
@@ -206,7 +206,8 @@ class Check(Command):
         if 'REPOSITORY_FORMAT' in os.environ:
             return [os.environ['REPOSITORY_FORMAT']]
         else:
-            return cliapp.runcmd(['./obnam', 'list-formats']).splitlines()
+            return cliapp.runcmd(['./obnam', '--no-default-configs',
+                                  'list-formats']).splitlines()
 
     def run_yarn_for_repo_format(self, repo_format):
         print 'run yarn for repository format %s' % repo_format