view contrib/showstack.py @ 34419:fa26f5891e68

effectflag: detect when parents changed

Store in effect flag when the parents changed between the predecessor and
its successors.

It can happens with "hg rebase" or "hg grab".

Differential Revision: https://phab.mercurial-scm.org/D539

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

from __future__ import absolute_import
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 extsetup(ui):
    signal.signal(signal.SIGQUIT, sigshow)
    try:
        signal.signal(signal.SIGINFO, sigshow)
    except AttributeError:
        pass