cbbackup throws an exception and hangs when disk is full

vagrant@node1-cb400-ubuntu12:/tmp$ /opt/couchbase/bin/cbbackup -u Administrator -p password -b travel-sample http://127.0.0.1:8091 /tmp/backup-`date +%Y%m%d-%H%M%S`

Exception in thread s1:

Traceback (most recent call last):

  File "/usr/lib/python2.7/threading.py", line 551, in __bootstrap_inner

    self.run()

  File "/usr/lib/python2.7/threading.py", line 504, in run

    self.__target(*self.__args, **self.__kwargs)

  File "/opt/couchbase/lib/python/pump_bfd.py", line 627, in run

    rv, db, db_dir = self.create_db(cbb)

  File "/opt/couchbase/lib/python/pump_bfd.py", line 753, in create_db

    rv, dir = self.mkdirs()

  File "/opt/couchbase/lib/python/pump_bfd.py", line 813, in mkdirs

    if error.errno != errno.EEXIST:

NameError: global name 'errno' is not defined

## command does not exit after this

808

        spec = os.path.normpath(self.spec)

809

        if not os.path.isdir(spec):

810

            try:

811

                os.mkdir(spec)

812

            except OSError as error:

813

                if error.errno != errno.EEXIST:

814

                    return "error: could not mkdir: %s; exception: %s" % (spec, error.strerror)