exceptions.OSError: [Errno 13] Permission denied: '/srv/http/dl'
/usr/lib/python2.7/site-packages/twisted/internet/defer.py:137 in maybeDeferred
136    try:
137        result = f(*args, **kw)
138    except:
/usr/lib/python2.7/site-packages/buildbot/steps/transfer.py:267 in start
266        # we use maxsize to limit the amount of data on both sides
267        fileWriter = _FileWriter(masterdest, self.maxsize, self.mode)
268
/usr/lib/python2.7/site-packages/buildbot/steps/transfer.py:46 in __init__
45        if not os.path.exists(dirname):
46            os.makedirs(dirname)
47
/usr/lib/python2.7/os.py:150 in makedirs
149        try:
150            makedirs(head, mode)
151        except OSError, e:
/usr/lib/python2.7/os.py:157 in makedirs
156            return
157    mkdir(name, mode)
158
exceptions.OSError: [Errno 13] Permission denied: '/srv/http/dl'