view contrib/showstack.py @ 45280:98218c83242f

merge: improve documentation of fbid dict used for merge bid

I improved the comments explaning what the dict contains meanwhile organizing
the comment structure which prevents some confusion.

Due to formatting issues, the empty dict was wrapped in `()` which might decieve
in thinking that it's a tuple of dict until you decide to find a comma.

Differential Revision: https://phab.mercurial-scm.org/D8818

# 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