[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2366: set up buildslave to find deprecation warnings

[Tahoe-LAFS]

#2366: set up buildslave to find deprecation warnings
--------------------------------+----------------------------
 Reporter:  warner              |          Owner:
     Type:  task                |         Status:  new
 Priority:  normal              |      Milestone:  eventually
Component:  dev-infrastructure  |        Version:  1.10.0
 Keywords:                      |  Launchpad Bug:
--------------------------------+----------------------------
 #2312 was a `DeprecationWarning` that resulted from Tahoe code misusing an
 interface (`twisted.web.Request.setHeader`) and the Twisted folks
 eventually reminding people to use it correctly by signalling a warning
 unless you did it right. The warning was suppressed on most of our
 buildslaves (running py2.7, where `DeprecationWarnings` are not enabled by
 default), but a few py2.6 builders noticed it.

 It'd be nice to notice these things better. I'd like to set up a builder
 that adds {{{PYTHONWARNINGS=default::DeprecationWarning}}}, to re-enable
 these warnings (even under python2.7). I'd also like to add some tooling
 which gathers the warnings, removes ones that are known problems in other
 people's code, and goes red if Tahoe itself triggers anything.

 It'd probably be most useful to run this builder with the latest version
 of Twisted, maybe even Twisted trunk, to find problems early. Ideally we'd
 run this with the full (13-dimensional?) matrix of dependency versions,
 but I think Twisted is the one place that's most likely to produce
 actionable deprecation warnings.

--
Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2366>
Tahoe-LAFS <https://Tahoe-LAFS.org>
secure decentralized storage