According to https://github.com/travis-ci/travis-ci/issues/2788 (which was WONTFIXED), roughly half the travis-ci buildserver fleet runs off tmpfs volumes, which have different notions of space-free and space-used than real filesystems. We've adapted our tests to avoid relying upon space-used>0, and no longer need this call to investigate the problem. refs ticket:2290
Tahoe-LAFS
Tahoe-LAFS is a Free Software/Open Source decentralized data store. It distributes your filesystem across multiple servers, and even if some of the servers fail or are taken over by an attacker, the entire filesystem continues to work correctly and to preserve your privacy and security.
To get started please see quickstart.rst in the docs directory.
LICENCE
Copyright 2006-2014 The Tahoe-LAFS Software Foundation
You may use this package under the GNU General Public License, version 2 or, at your option, any later version. You may use this package under the Transitive Grace Period Public Licence, version 1.0, or at your option, any later version. (You may choose to use this package under the terms of either licence, at your option.) See the file COPYING.GPL for the terms of the GNU General Public License, version 2. See the file COPYING.TGPPL.rst for the terms of the Transitive Grace Period Public Licence, version 1.0.
See TGPPL.PDF for why the TGPPL exists, graphically illustrated on three slides.