Upstream has added devel warnings that require us to register all the configs
and remove the defaults that are specified at read time. This doesn't fix all
the cases, but is the start.
Differential Revision: https://phab.mercurial-scm.org/D1206
Summary:
Sometimes the hg process gets stuck, and we want to get the stack traces to
learn what it's doing. It's not a big issue if gdb can be used with python
debugging support [1]. However, that feature could not be easily set up on
OS X. This extension will make debugging on OS X easier by providing the
Python stack traces on SIGUSR1.
It's similar to OpenStack's "GuruMeditationReport" feature [2].
Unlike `contrib/showsstack.py`, this extension uses SIGUSR1 instead of SIGQUIT,
and writes to a file, instead of stderr, and prints all threads, instead of
just the current one. So it's more practically useful. We may want to
replace `showstack.py` eventually.
[1]: https://wiki.python.org/moin/DebuggingWithGdb
[2]: https://wiki.openstack.org/wiki/GuruMeditationReport
Test Plan: Added a new test
Reviewers: #sourcecontrol, rmcelroy
Reviewed By: rmcelroy
Subscribers: rmcelroy, mjpieters
Differential Revision: https://phabricator.intern.facebook.com/D4660938
Signature: t1:4660938:1488927878:c751856681816a739160c361ed5cc10bab325000
