When trying:
scap sync-l10n 1.29.0-wmf.4
I got
File "/usr/lib/python2.7/dist-packages/scap/main.py", line 38, in main
with utils.lock(self.config['lock_file'], self.arguments.message):AttributeError: 'Namespace' object has no attribute 'message'
I believe this probably has something to do with https://lists.wikimedia.org/pipermail/wikitech-l/2016-November/087107.html