view contrib/showstack.py @ 45965:c7c1efdfd4de

git: show the version of `pygit2` with verbose version output

This seems like useful info to have when debugging.  I followed the precedent of
hg-git, which prints something like:

      hggit        external  0.9.0a1 (dulwich 0.19.15)

We don't have a version number assigned (because it's internal), so it's just
the parenthetical.

Differential Revision: https://phab.mercurial-scm.org/D9436

# showstack.py - extension to dump a Python stack trace on signal
#
# binds to both SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs)
r"""dump stack trace when receiving SIGQUIT (Ctrl-\) or SIGINFO (Ctrl-T on BSDs)
"""

from __future__ import absolute_import, print_function
import signal
import sys
import traceback


def sigshow(*args):
    sys.stderr.write("\n")
    traceback.print_stack(args[1], limit=10, file=sys.stderr)
    sys.stderr.write("----\n")


def sigexit(*args):
    sigshow(*args)
    print('alarm!')
    sys.exit(1)


def extsetup(ui):
    signal.signal(signal.SIGQUIT, sigshow)
    signal.signal(signal.SIGALRM, sigexit)
    try:
        signal.signal(signal.SIGINFO, sigshow)
    except AttributeError:
        pass